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revision 1478 by frank, Thu Jul 24 17:00:25 2003 UTC revision 2447 by frank, Mon Dec 13 11:53:15 2004 UTC
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1  <?xml version="1.0" encoding="ISO-8859-1"?>  <?xml version="1.0" encoding="ISO-8859-1"?>
2  <!DOCTYPE book  <!DOCTYPE book
3          PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN"          PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN"
4          "http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd">          "http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd"
5        [<!ENTITY imgscale "60">]>
6  <!-- $Revision$ -->  <!-- $Revision$ -->
7  <book>  <book>
8    <bookinfo>    <bookinfo>
9      <title>Thuban Manual</title>      <title>User's Manual for Thuban 1.0</title>
10      <author>          <authorgroup>
11        <firstname>Jonathan</firstname><surname>Coles</surname>        <author>
12      </author>          <firstname>Jonathan</firstname><surname>Coles</surname>
13      <author>        </author>
14        <firstname>Jan-Oliver</firstname><surname>Wagner</surname>        <author>
15      </author>          <firstname>Jan-Oliver</firstname><surname>Wagner</surname>
16      <author>        </author>
17        <firstname>Frank</firstname><surname>Koormann</surname>        <author>
18      </author>          <firstname>Frank</firstname><surname>Koormann</surname>
19          </author>
20            </authorgroup>
21      <copyright>      <copyright>
22        <year>2003</year>        <year>2003, 2004</year>
23        <holder>Intevation GmbH</holder>        <holder>Intevation GmbH</holder>
24      </copyright>      </copyright>
25       <revhistory>
26    <!-- comment this first revision out when releasing a real version -->
27         <revision>
28            <revnumber>CVS version $Id$</revnumber>
29            <date></date>
30            <revremark>Under development.</revremark>
31         </revision>
32         <revision>
33            <revnumber>1.0.0</revnumber>
34            <date>22-Jan-2004</date>
35            <revremark>
36                            Corresponds to Thuban 1.0.0.
37                            New: Installation instructions for Win32.
38                    </revremark>
39         </revision>
40         <revision>
41            <revnumber>1.0pre3</revnumber>
42            <date>04-Dec-2003</date>
43            <revremark>
44                            Corresponds to Thuban 1.0rc1.
45                            New: I18n, right button legend menu, EPSG projectons,
46                PostGIS support.
47                    </revremark>
48         </revision>
49         <revision>
50            <revnumber>1.0pre2</revnumber>
51            <date>29-Aug-2003</date>
52            <revremark>
53                            Corresponds to Thuban development release 0.8.1.
54                            New: chapter on extensions.
55                    </revremark>
56         </revision>
57         <revision>
58            <revnumber>1.0pre1</revnumber>
59            <date>08-Aug-2003</date>
60            <revremark>Corresponds to Thuban development release 0.8.1.</revremark>
61         </revision>
62      </revhistory>
63    
64    </bookinfo>    </bookinfo>
65    
66    <chapter><title>Introduction</title>    <chapter><title>Introduction</title>
67      <para>      <para>
68      Thuban is a Free Software Geographic Information Systems (GIS) viewer.      Thuban is an interactive geographic data viewer.
69      It is being developed because there is currently no simple interactive      Its development had been started because there was no simple interactive
70      viewer for geographic information available as Free Software. Thuban is      viewer for geographic information available as Free Software. Thuban is
71      written in Python and C++ and uses the wxWindows library allowing it to      written mainly in Python and uses the wxWidgets (former wxWindows)
72        library allowing it to
73      run on many different platforms, including GNU/Linux and Windows.      run on many different platforms, including GNU/Linux and Windows.
74      </para>      </para>
75      <para>      <para>
76      GIS viewers are a necessary tool as they allow one to get a visual      Geographic data viewers are a necessary tool as they allow one to
77            get a visual
78      impression of the positional relationship of the information that may not      impression of the positional relationship of the information that may not
79      be apparent from simple inspection of the data values themselves.      be apparent from simple inspection of the data values themselves.
80      Thuban allows the user to create a session that displays      Thuban allows the user to create a session that displays
# Line 39  Line 83 
83      </para>      </para>
84      <para>      <para>
85      Thuban arranges a session in a hierarchy. A session contains a map which      Thuban arranges a session in a hierarchy. A session contains a map which
86      consists of layers. Each layer represents one kind of data set. For      consists of layers. Each layer represents a data set. For
87      instance, there may be a layer for roads and another layer for buildings.      instance, there may be a layer for roads and another layer for buildings.
88      These layers can either be vector shapes or images.      These layers can either be vector shapes or images.
89      </para>      </para>
# Line 47  Line 91 
91          <section><title>Installation</title>          <section><title>Installation</title>
92          <para>          <para>
93          Thuban is actively supported under Debian Testing (sarge), RedHat 7.2,          Thuban is actively supported under Debian Testing (sarge), RedHat 7.2,
94          and Windows 2000. All the necessary files can be found on the          and Windows 2000. Thuban depends on the following packages. These
95            packages can also be found on the
96          <ulink url="http://thuban.intevation.org/download.html">          <ulink url="http://thuban.intevation.org/download.html">
97          Thuban Download site          Thuban Download site
98          </ulink>.          </ulink>.
99          </para>          </para>
100            <para>
101            Required:
102            <itemizedlist>
103                <listitem><para>Python 2.2.1
104                            (<literal>http://www.python.org</literal>)
105                            </para></listitem>
106                <listitem><para>wxWindows 2.4
107                            (<literal>http://www.wxwindows.org</literal>)
108                            </para></listitem>
109                <listitem><para>wxPython 2.4
110                            (<literal>http://www.wxpython.org</literal>)
111                            </para></listitem>
112                <listitem><para>proj 4.4.5 Projection Library
113                            (<literal>http://www.remotesensing.org/proj/</literal>)
114                            </para></listitem>
115                <listitem><para>SQLite 2.8.3
116                            <literal>http://www.hwaci.com/sw/sqlite/</literal>)
117                            </para></listitem>
118                <listitem><para>PySQLite 0.4.3
119                            (<literal>http://pysqlite.sourceforge.net</literal>)
120                            </para></listitem>
121            </itemizedlist>
122            </para>
123            <para>
124            Optional:
125            <itemizedlist>
126                <listitem><para>GDAL 1.1.8
127                            (<literal>http://www.remotesensing.org/gdal/</literal>)
128                            </para></listitem>
129                <listitem><para>psycopg 1.0.8
130                            (<literal>http://initd.org/software/psycopg</literal>)
131                            </para></listitem>
132                </itemizedlist>
133            </para>
134                    <para>
135                    Along with the source codes, the download page also offers full
136                    installation packages for Debian, Windows and RPM-based systems
137                    (Mandrake, RedHat, SuSE, etc).
138                    </para>
139                    <section><title>RPM-based GNU/Linux Systems</title>
140                            <section><title>Installing Binary Packages</title>
141                                    <para>
142                                    The most wide-spread RPM-based GNU/Linux
143                                    Systems are RedHat, Mandrake and SuSE.
144                                    The documentation of these distributions
145                                    should contain information about how to
146                                    install third-party RPM packages.
147                                    Nonetheless, a short summary is provided here.
148                                    </para>
149                                    <para>
150                                    RPM packages can be installed applying several
151                                    tools. The most basic one is the command line
152                                    program "rpm".  The hardware architecture is
153                                    identified in the name of RPM packages, eg.
154                                    'i386' for most Intel/AMD architectures.  
155                                    If you have a different hardware architecture,
156                                    where no binary RPM packages are provided,
157                                    you must rebuild binary packages from the
158                                    RPM source packages first (see below).
159                                    Typical rpm commands look like:
160    
161                                    <programlisting>
162                                    rpm --install Thuban-0.9.0-1.i386.rpm
163                                    </programlisting>
164    
165                                    Depending on what you already have installed
166                                    on your system, you are informed that some
167                                    packages are required, but not installed.
168                                    You need to install them first. Either they
169                                    are provided by your GNU/Linux distributor
170                                    or available somewhere on the Internet.  
171                                    The more essential and special ones are
172                                    provided together with the Thuban package.
173                                    </para>
174    
175                                    <para>
176                                    For rpm exist some graphical user interfaces, notably
177                                    kpackage, GnoRPM and xrpm.
178                                    </para>
179    
180                                    <para>
181                                    Make yourself familiar with one of the tools and apply it
182                                    to install the packages.
183                                    Note, that you need to be administrator (root) for the system
184                                    to do that.
185                                    </para>
186                            </section>
187                            <section><title>Build Binaries from Source Packages</title>
188                                    <para>
189                                    This section describes howto build RPM install-packages
190                                    from RPM source-packages.
191                                    This adapts and optimizes an install-package specifically
192                                    to your system.
193                                    This is especially helpful to resolve version conflicts of
194                                    dependent packages. Furthermore, install-packages for other
195                                    platforms (e.g. PowerPC) can be created.
196                                    </para>
197    
198                                    <para>
199                                    Note: rpm must be at least version 4. Execute
200                                    <literal>rpm --version</literal> to find out about the version.
201                                    </para>
202    
203                                    <para>
204                                    You need to do the following preparations to be able to
205                                    build the packages as a regular user. You should now
206                                    perform the package buling as root since this
207                                    might cause damage to your system.
208                            <itemizedlist>
209                            <listitem>
210                                                    <para>
211                                                    Create RPM directory structure:
212                                                    Choose a directory (e.g. $HOME/myrpm) and create the
213                                                    subdirectories BUILD, RPM, SOURCES, SPECS and SRPMS.
214                                                    A possible command sequence for this is:
215                                                    <programlisting>
216                                                    mkdir $HOME/freegisrpm
217                                                    cd $HOME/freegisrpm
218                                                    mkdir BUILD RPMS SOURCES SPECS SRPMS
219                                                    </programlisting>
220                                                    </para>
221                                            </listitem>
222                                            <listitem>
223                                                    <para>
224                                                    Set environment variable RPM_DIR:
225                                                    <programlisting>
226                                                    export RPM_DIR=$HOME/freegisrpm
227                                                    </programlisting>
228                                                    </para>
229                                            </listitem>
230                                            <listitem>
231                                                    <para>
232                                                    Create $HOME/.rpmmacros:
233                                                    This file sets general preferences and some
234                                                    specific settings for signing packages.
235                                                    If you don't have a GnuPG-key, you can skip
236                                                    the signature settings i.e. drop the last 4 lines.
237                                                    A signature becomes important when you want to
238                                                    give away packages to third parties.
239                                                    <programlisting>
240    <![CDATA[
241    %packager Name Lastname <[email protected]>
242    
243    %_topdir /home/mylogin/myrpm
244    
245    %_signature gpg
246    %_gpg_name Name Lastname
247    %_pgp_path ~/.gnupg
248    %_pgpbin /usr/bin/gpg
249    ]]>
250                                                    </programlisting>
251                                                    </para>
252                                            </listitem>
253                            </itemizedlist>
254    
255                                    Now you can install any RPM source-package.
256                                    It's components are installed into the corresponding
257                                    subdirectories of your rpm-directory.
258                                    Essentially these are the sources (into directory SOURCES)
259                                    and the so-called spec-file which contains all build
260                                    instructions. The spec-file will go into the SPEC directory.
261                                    Example:
262                                    <literal>rpm --install Thuban-0.9.0-1.src.rpm</literal>
263                                    </para>
264    
265                                    <para>
266                                    Create install-package:
267                                    Go to the directory with the spec-files and rebuild the
268                                    package:
269                                    <programlisting>
270    cd $HOME/mypm/SPECS
271    rpm -bb thuban.spec
272                                    </programlisting>
273                                    Next, you will find the newly created package in
274                                    $HOME/myrpm/RPMS/i386.
275                                    If you build the package for another architecture than
276                                    i386, then the name of the directory has a corresponding name.
277                                    </para>
278                                    <para>
279                                    For documentation of RPM, either type
280                                    <literal>man rpm</literal> or <literal>rpm --help</literal>.
281                                    This will provide you with information on the various command
282                                    line options of RPM.
283                                    For more information see the
284                            <ulink url="http://www.rpm.org/">homepage of RPM</ulink>.
285                                    </para>
286                            </section>
287                    </section> <!-- Intro - Installation - RPM-->
288    
289                    <section><title>Win32 Systems</title>
290                    <para>
291                            A common installation package of Thuban for Win32
292                            systems is available from the Thuban website download
293                            section. This installation package is configured for
294                            displaying file based vector data (Shapefiles). For the
295                            display of raster data or the connection to spatial
296                            databases additional steps are needed.  
297                    </para>
298                    <para>
299                            The required Python packages are listed and linked on
300                            the download page as well.  If you don't have Python
301                            installed already, download the packages for Python,
302                            wxPython for Python and the SQLite Python Libraries as
303                            well as the Thuban package. Install all four packages
304                            in the order: Python, wxPython, SQLite, Thuban. Follow
305                            the installation instructions provided by the seperate
306                            setups. The Thuban installation package will add an
307                            entry in the menu folder you configured.
308                    </para>
309                    <section><title>Raster Data: Installation of GDAL</title>
310                    <para>
311                            Enabling the raster data features of Thuban is
312                            straight forward. For the examples we assume that
313                            Thuban has been installed under
314                            <literal>C:\Thuban</literal>:
315                            <itemizedlist>
316                            <listitem>
317                            <para>
318                            Download the zip-archive <ulink
319                            url="ftp://intevation.de/thuban/win2k/gdal-win2k.zip"
320                            >gdal-win2k</ulink>.
321                            </para></listitem>
322                            <listitem><para>Extract the archive (e.g. with
323                            <ulink
324                            url="http://www.info-zip.org/pub/infozip/WiZ.html"
325                            >WiZ (InfoZip)</ulink>) into the
326                            <literal>C:\Thuban\Lib</literal>
327                            directory of your Thuban installation.
328                            </para>
329                            </listitem>
330                            <listitem>
331                            <para>
332                            Extent the <varname>PYTHONPATH</varname>
333                            environment variable (in your Windows Control Panel)
334                            to make the new libraries available for Thuban.
335                            <programlisting>
336    %PYTHONPATH%;C:\Thuban\Lib\gdal;C:\Thuban\Lib\gdal\pymod
337                            </programlisting>
338                            </para>
339                            </listitem>
340                            <listitem>
341                            <para>
342                            Extent also the <varname>PATH</varname>
343                            environment variable accordingly:
344                            <programlisting>
345    %PATH%;C:\Thuban\Lib\gdal
346                            </programlisting>
347                            </para>
348                            </listitem>
349                            </itemizedlist>
350                            After this installation steps Thuban is ready to
351                            display raster data (e.g. the
352                            <literal>island.tif</literal> from the Iceland Demo
353                            data set.
354                    </para>
355                    </section> <!-- Win32: GDAL-->
356    
357                    <section><title>Working with PostGIS: Installation of PsycoPG</title>
358                    <para>
359                            To access PostgreSQL/PostGIS spatial databases with
360                            Thuban you have to install the PsycoPG package for
361                            Windows:
362                            <itemizedlist>
363                            <listitem>
364                            <para>
365                            Download the zip-archive
366                            <ulink
367                                    url="http://stickpeople.com/projects/python/win-psycopg/win-psycopg22.zip"
368                            >win-psycopg22.zip</ulink>.
369                            </para>
370                            </listitem>
371                            <listitem>
372                            <para>
373                            Extract the zip-archive into a directory either already
374                            in your <varname>PYTHONPATH</varname> or extent your
375                            <varname>PYTHONPATH</varname> variable to the directory
376                            you have extracted the archive to.
377                            </para>
378                            </listitem>
379                            </itemizedlist>
380                            For installation and maintenance of spatial databases
381                            we refer to the  <ulink
382                            url="http://postgis.refractions.net"
383                            >PostGIS Homepage</ulink>.
384                    </para>
385                    </section> <!-- Win32: PsycoPG-->
386    
387                    </section> <!-- Intro - Installation - Win32 -->
388          </section>          </section>
389    
390            <section><title>Internationalization</title>
391            <para>
392            Thuban is implemented with internationalization support. So far Thuban
393            is translated by volunteers to the following languages (apart from its
394            main language: English):
395            <itemizedlist>
396                <listitem><para>French</para></listitem>
397                <listitem><para>German</para></listitem>
398                <listitem><para>Italian</para></listitem>
399                    <listitem><para>Portuguese (Brazilian)</para></listitem>
400                <listitem><para>Russian</para></listitem>
401                <listitem><para>Spanish</para></listitem>
402            </itemizedlist>
403            </para>
404    
405            <para>
406            To use internationalization under POSIX systems (like GNU/Linux)
407            you have to set the environment variable LC_ALL accordingly (e.g.
408            LC_ALL=fr_FR for the french language support). Please check your
409            systems documentation for details and supported settings.
410            Specifiying LC_ALL on the command line while launching thuban
411            allows appication specific language settings:
412            </para>
413            <programlisting>
414            LC_ALL=fr_FR thuban.py
415            </programlisting>
416    
417            <para>
418            MS Windows users have to specify the language to be used via the control
419            bar (which effects all applications).
420            </para>
421            </section>
422    
423          <section><title>The Main Window</title>          <section><title>The Main Window</title>
424          <para>          <para>
425          <screenshot>          <figure>
426          <screeninfo>The Main Window</screeninfo>          <title>The Main Window</title>
427          <mediaobject>          <mediaobject>
428          <imageobject> <imagedata fileref="../images/1_2_mainwindow.png" format="PNG"/> </imageobject>          <imageobject> <imagedata fileref="../images/1_2_mainwindow.png" format="PNG" scale="&imgscale;"/> </imageobject>
429          <imageobject> <imagedata fileref="./images/1_2_mainwindow.ps" format="EPS"/> </imageobject>          <imageobject> <imagedata fileref="./images/1_2_mainwindow.ps" format="EPS" scale="&imgscale;"/> </imageobject>
         <textobject><phrase>The Main Window</phrase></textobject>  
         <caption><para>The Main Window</para></caption>  
430          </mediaobject>          </mediaobject>
431          </screenshot>          </figure>
432          </para>          </para>
433    
434          <para>          <para>
# Line 100  Line 464 
464          The tool bar provides quick access to the commonly needed tools.          The tool bar provides quick access to the commonly needed tools.
465          By hovering over each button the user can see a short messages          By hovering over each button the user can see a short messages
466          describing what the tool does. The tools provided are Zoom In, Zoom          describing what the tool does. The tools provided are Zoom In, Zoom
467          Out, Pan, Full Extent, Full Layer Extent, Full Shape Extent, Indentify,          Out, Pan, Full Extent, Full Layer Extent, Full Shape Extent, Identify,
468          and Label. Each of the tools will be explained in further detail later          and Label. Each of the tools will be explained in further detail later
469          in the manual.          in the manual.
470          </para>          </para>
# Line 116  Line 480 
480          <menuchoice>          <menuchoice>
481          <guimenu>File</guimenu>          <guimenu>File</guimenu>
482          <guimenuitem>New Session</guimenuitem>          <guimenuitem>New Session</guimenuitem>
483          </menuchoice>.          </menuchoice>.
   
484          If a session is already loaded and has been modified without          If a session is already loaded and has been modified without
485          being saved a prompt will ask if the current session should          being saved a prompt will ask if the current session should
486          be saved.          be saved. A new session consists of an empty map with no
487            layers, no tables and no projection.
488          </para>          </para>
489          </section>          </section>
490    
# Line 131  Line 494 
494          <menuchoice>          <menuchoice>
495          <guimenu>File</guimenu>          <guimenu>File</guimenu>
496          <guimenuitem>Open Session</guimenuitem>          <guimenuitem>Open Session</guimenuitem>
497          </menuchoice>.          </menuchoice>. A dialog box will open allowing the user to browse
498            for a Thuban Session file. Thuban session files end with
499            <varname>.thuban</varname>. Selecting a file a clicking
500            <guibutton>OK</guibutton> will load the session into Thuban.
501                    </para>
502    
503                    <para>
504          If a session is already loaded and has been modified without          If a session is already loaded and has been modified without
505          being saved a prompt will ask if the current session should          being saved a prompt will ask if the current session should
506          be saved.          be saved.
507          </para>          </para>
508                    
509                    <para>
510                    Thuban provides a path recovery feature: If a (shape) file referenced
511                    in a Thuban session cannot be found at the specified location, the user
512                    is prompted a file dialog. Here a new location can be selected for the
513                    currents layer data source. Cancelling the dialog removes the layer
514                    from the session. If a new location has been selected, Thuban checks
515                    this again, if further layers data sources are missing. The user is
516                    informed about this and can accept or cancel the suggestion.
517            </para>
518          </section>          </section>
519    
520          <section><title>Saving a Session</title>          <section><title>Saving a Session</title>
# Line 146  Line 524 
524          <guimenu>File</guimenu>          <guimenu>File</guimenu>
525          <guimenuitem>Save Session</guimenuitem>          <guimenuitem>Save Session</guimenuitem>
526          </menuchoice>.          </menuchoice>.
527                    In the case the session is not a new and unsaved one,
528                    the corresponding file is updated with the current session
529                    data.
530                    In the case the current session is a new one and yet unsaved
531                    a dialog box will open allowing the user to browse
532            the file system and select a place to save the session. Thuban
533            sessions should be saved under a name ending in
534            <varname>.thuban</varname>. If the file already exists the user
535            will be prompted to save under a different name or overwrite the
536            existing file.
537          </para>          </para>
538          </section>          </section>
539    
540          <section><title>The Session Info-Tree</title>          <section><title>The Session Info-Tree</title>
541            <para>
542            <figure>
543            <title>Session Info Tree</title>
544            <mediaobject>
545            <imageobject><imagedata fileref="../images/2_4_session_tree.png" format="PNG" scale="&imgscale;"/></imageobject>
546            <imageobject><imagedata fileref="./images/2_4_session_tree.eps" format="EPS" scale="&imgscale;"/></imageobject>
547            </mediaobject>
548            </figure>
549            </para>
550          <para>          <para>
551                  (primarily for developers)          The session info-tree is primarily intended for developers working
552            with Thuban. It displays many of the internal values for the session,
553            map, and layers. It can be opened from
554            <menuchoice>
555            <guimenu>File</guimenu>
556            <guimenuitem>Session Tree</guimenuitem>
557            </menuchoice>.
558          </para>          </para>
559          </section>          </section>
560    </chapter>    </chapter>
# Line 163  Line 565 
565      different type of data set. By interacting with the map the user can      different type of data set. By interacting with the map the user can
566      visually explore the data.      visually explore the data.
567      </para>      </para>
568        <para>
569        The map can have a name that will appear in the Thuban title bar.
570        The map name can be changed using
571        <menuchoice>
572        <guimenu>Map</guimenu>
573        <guimenuitem>Rename</guimenuitem>
574        </menuchoice>.
575        </para>
576        <para>
577        <inlinemediaobject>
578        <imageobject>
579        <imagedata fileref="../images/3_rename_map.png" format="PNG" scale="&imgscale;"/>
580        </imageobject>
581        <imageobject>
582        <imagedata fileref="./images/3_rename_map.eps" format="EPS" scale="&imgscale;"/>
583        </imageobject>
584        <textobject> <phrase>Rename Map</phrase> </textobject>
585        </inlinemediaobject>
586        </para>
587    
588          <section><title>Adding and Removing Layers</title>          <section><title>Adding and Removing Layers</title>
589          <para>          <para>
590          There are two types of layers that can use added to a map: shape layers          There are three types of layers that can be added to a map:
591            Shape layers, database layers
592          and image layers. Shape layers are stored in Shapefile format, a          and image layers. Shape layers are stored in Shapefile format, a
593          standard file format for storing geographic objects. Normally, these          widely used file format for storing geographic objects. These
594          files have the extension ``.shp''. Associated with          files have the extension ``.shp''. Associated with
595          the object information is a database file which stores attributes for          the shape file is a database file which stores attributes for
596          each shape in the Shapefile. This file, stored in DB2 format, usually          each shape in the Shape file. This file, in dBase format,
597          has the extension ``.dbf''. Both files should have the same base name.          has the extension ``.dbf''. Both files must have the same base name.
598          For example, if there is a Shapefile named roads.shp there should          For example, if there is a shape file named roads.shp there must
599          also be a file roads.dbf.          also be a file roads.dbf.
600          </para>          </para>
601          <para>          <itemizedlist>
602            <listitem>
603            <para>
604          Shape layers can be added to the map with          Shape layers can be added to the map with
605          <menuchoice>          <menuchoice>
606          <guimenu>Map</guimenu>          <guimenu>Map</guimenu>
607          <guimenuitem>Add Layer</guimenuitem>          <guimenuitem>Add Layer</guimenuitem>
608          </menuchoice>.          </menuchoice>.
609          Thuban will load all files with the same base name, so it doesn't          Initially, only the ``.shp'' files are shown which is enough for the
610          matter if the Shapefile or database file is selected.                  selection. However, if you switch to display all files and select one
611          </para>                  of the associated files (e.g. ``.dbf''), Thuban will recognize the base
612                    name and load the corresponding Shape file.
613            </para>
614                    <para>
615                    The file dialog for Shape files allows to select multiple files.
616                    Use the shift-button together with the left mouse button to extend
617                    the selection.
618            </para>
619            </listitem>
620    
621            <listitem>
622            <para>Database layers can be added to the map with
623            <menuchoice>
624            <guimenu>Map</guimenu>
625            <guimenuitem>Add Database Layer</guimenuitem>
626            </menuchoice>.
627            A dialog with two is list is opened. The left list displays all
628            database connections currently open for the session. You can retrieve
629            a list of available layers from the selected database which is
630            displayed on the right hand. From this list one layer can be selected,
631            the dialog is closed afterwards.
632            </para>
633            <para>
634            See appendix ``Working with PostGIS'' for details.
635            </para>
636            </listitem>
637    
638            <listitem>
639          <para>          <para>
640          Image layers can be added to the map with          Image layers can be added to the map with
641          <menuchoice>          <menuchoice>
# Line 193  Line 643 
643          <guimenuitem>Add Image Layer</guimenuitem>          <guimenuitem>Add Image Layer</guimenuitem>
644          </menuchoice>.          </menuchoice>.
645          It is important to select a valid image file that has geographic          It is important to select a valid image file that has geographic
646          data associated with it. This can be embedded in the file itself,          data associated with it. The data can be embedded in the file itself,
647          or in another file. If geographic information cannot be found, Thuban          or in another file. If geographic information cannot be found, Thuban
648          will report an error.          will report an error.
649          </para>          </para>
650            </listitem>
651            </itemizedlist>
652          </section>          </section>
653    
654          <section><title>Navigation</title>          <section><title>Navigation</title>
655          <para>          <para>
656          The map can be explored by using the navigation tools available on          The map can be explored by using the navigation tools available on
657          the tool bar, or from the          the tool bar or from the
658          <menuchoice><guimenu>Map</guimenu></menuchoice> menu.          <menuchoice><guimenu>Map</guimenu></menuchoice> menu.
659          </para>          </para>
660            <itemizedlist>
661            <listitem>
662          <para>          <para>
663          The ZoomIn tool          The ZoomIn tool
664          <inlinemediaobject>          <inlinemediaobject>
665          <imageobject>          <imageobject>
666          <imagedata fileref="../images/3_2_zoomin.png" format="PNG"/>          <imagedata fileref="../images/3_2_zoomin.png" format="PNG" scale="&imgscale;"/>
667          </imageobject>          </imageobject>
668          <imageobject>          <imageobject>
669          <imagedata fileref="./images/3_2_zoomin.eps" format="EPS"/>          <imagedata fileref="./images/3_2_zoomin.eps" format="EPS" scale="&imgscale;"/>
670          </imageobject>          </imageobject>
671          <textobject> <phrase>ZoomIn Tool</phrase> </textobject>          <textobject> <phrase>ZoomIn Tool</phrase> </textobject>
672          </inlinemediaobject>          </inlinemediaobject>
673          can be used to enlarge a region of the map. Clicking once on the map          enlarges a region of the map. Clicking once on the map
674          will double the magnification and center the map on the point that          will double the magnification and center the map on the point that
675          was clicked. Clicking and dragging lets the user select a region          was clicked. Clicking and dragging selects a region that will be
676          to be enlarged to fit the window.          enlarged to fit the window.
677          </para>          </para>
678            </listitem>
679            <listitem>
680          <para>          <para>
681          The ZoomOut tool          The ZoomOut tool
682          <inlinemediaobject>          <inlinemediaobject>
683          <imageobject>          <imageobject>
684          <imagedata fileref="../images/3_2_zoomout.png" format="PNG"/>          <imagedata fileref="../images/3_2_zoomout.png" format="PNG" scale="&imgscale;"/>
685          </imageobject>          </imageobject>
686          <imageobject>          <imageobject>
687          <imagedata fileref="./images/3_2_zoomout.eps" format="EPS"/>          <imagedata fileref="./images/3_2_zoomout.eps" format="EPS" scale="&imgscale;"/>
688          </imageobject>          </imageobject>
689          <textobject> <phrase>ZoomOut Tool</phrase> </textobject>          <textobject> <phrase>ZoomOut Tool</phrase> </textobject>
690          </inlinemediaobject>          </inlinemediaobject>
# Line 237  Line 693 
693          selects a box such that the current contents of the window will be          selects a box such that the current contents of the window will be
694          scaled to fit into that box.          scaled to fit into that box.
695          </para>          </para>
696            </listitem>
697            <listitem>
698          <para>          <para>
699          The Pan tool          The Pan tool
700          <inlinemediaobject>          <inlinemediaobject>
701          <imageobject>          <imageobject>
702          <imagedata fileref="../images/3_2_pan.png" format="PNG"/>          <imagedata fileref="../images/3_2_pan.png" format="PNG" scale="&imgscale;"/>
703          </imageobject>          </imageobject>
704          <imageobject>          <imageobject>
705          <imagedata fileref="./images/3_2_pan.eps" format="EPS"/>          <imagedata fileref="./images/3_2_pan.eps" format="EPS" scale="&imgscale;"/>
706          </imageobject>          </imageobject>
707          <textobject> <phrase>Pan Tool</phrase> </textobject>          <textobject> <phrase>Pan Tool</phrase> </textobject>
708          </inlinemediaobject>          </inlinemediaobject>
709          allows the user to move the map around by clicking and dragging.          allows the user to move the map around by clicking and dragging.
710          </para>          </para>
711            </listitem>
712            <listitem>
713          <para>          <para>
714          The Full Extent tool          The Full Extent tool
715          <inlinemediaobject>          <inlinemediaobject>
716          <imageobject>          <imageobject>
717          <imagedata fileref="../images/3_2_fullextent.png" format="PNG"/>          <imagedata fileref="../images/3_2_fullextent.png" format="PNG" scale="&imgscale;"/>
718          </imageobject>          </imageobject>
719          <imageobject>          <imageobject>
720          <imagedata fileref="./images/3_2_fullextent.eps" format="EPS"/>          <imagedata fileref="./images/3_2_fullextent.eps" format="EPS" scale="&imgscale;"/>
721          </imageobject>          </imageobject>
722          <textobject> <phrase>Full Extent Tool</phrase> </textobject>          <textobject> <phrase>Full Extent Tool</phrase> </textobject>
723          </inlinemediaobject>          </inlinemediaobject>
724          rescales the viewable region so that the entire map is visible.          rescales the viewable region so that the entire map is visible.
725          </para>          </para>
726            </listitem>
727            <listitem>
728          <para>          <para>
729          The Full Layer Extent tool          The Full Layer Extent tool
730          <inlinemediaobject>          <inlinemediaobject>
731          <imageobject>          <imageobject>
732          <imagedata fileref="../images/3_2_fulllayerextent.png" format="PNG"/>          <imagedata fileref="../images/3_2_fulllayerextent.png" format="PNG" scale="&imgscale;"/>
733          </imageobject>          </imageobject>
734          <imageobject>          <imageobject>
735          <imagedata fileref="./images/3_2_fulllayerextent.eps" format="EPS"/>          <imagedata fileref="./images/3_2_fulllayerextent.eps" format="EPS" scale="&imgscale;"/>
736          </imageobject>          </imageobject>
737          <textobject> <phrase>Full Layer Extent Tool</phrase> </textobject>          <textobject> <phrase>Full Layer Extent Tool</phrase> </textobject>
738          </inlinemediaobject>          </inlinemediaobject>
# Line 278  Line 740 
740          layer fits within the window. If no layer is selected this button          layer fits within the window. If no layer is selected this button
741          will be disabled.          will be disabled.
742          </para>          </para>
743            </listitem>
744            <listitem>
745          <para>          <para>
746          The Full Shape Extent tool          The Full Shape Extent tool
747          <inlinemediaobject>          <inlinemediaobject>
748          <imageobject>          <imageobject>
749          <imagedata fileref="../images/3_2_fullshapeextent.png" format="PNG"/>          <imagedata fileref="../images/3_2_fullshapeextent.png" format="PNG" scale="&imgscale;"/>
750          </imageobject>          </imageobject>
751          <imageobject>          <imageobject>
752          <imagedata fileref="./images/3_2_fullshapeextent.eps" format="EPS"/>          <imagedata fileref="./images/3_2_fullshapeextent.eps" format="EPS" scale="&imgscale;"/>
753          </imageobject>          </imageobject>
754          <textobject> <phrase>Full Shape Extent Tool</phrase> </textobject>          <textobject> <phrase>Full Shape Extent Tool</phrase> </textobject>
755          </inlinemediaobject>          </inlinemediaobject>
756          rescales the viewable region so that the currently selected          rescales the viewable region so that the currently selected
757          shape fits within the window. If the shape is a point, it is          shape fits within the window. If the shape is a point, it is
758          centered and the map is zoomed all the way in. If no shape is          centered and the map is zoomed all the way in. If no shape is
759          selected this button will be disabled.          selected this button will be disabled. This feature is especially
760            helpful when identifying an object related to a selected record
761            in a tableview (see below).
762    
763          </para>          </para>
764            </listitem>
765            </itemizedlist>
766          </section>          </section>
767    
768          <section><title>Object Identification</title>          <section><title>Object Identification</title>
# Line 301  Line 770 
770          Objects on the map can be identified using the Identify tool          Objects on the map can be identified using the Identify tool
771          <inlinemediaobject>          <inlinemediaobject>
772          <imageobject>          <imageobject>
773          <imagedata fileref="../images/3_3_identify.png" format="PNG"/>          <imagedata fileref="../images/3_3_identify.png" format="PNG" scale="&imgscale;"/>
774          </imageobject>          </imageobject>
775          <imageobject>          <imageobject>
776          <imagedata fileref="./images/3_3_identify.eps" format="EPS"/>          <imagedata fileref="./images/3_3_identify.eps" format="EPS" scale="&imgscale;"/>
777          </imageobject>          </imageobject>
778          <textobject> <phrase>Identify Tool</phrase> </textobject>          <textobject> <phrase>Identify Tool</phrase> </textobject>
779          </inlinemediaobject>.          </inlinemediaobject>.
780          Clicking on an object selects that object and opens a dialog which          Clicking on an object selects that object and opens a dialog which
781          shows all the table attributes for that object. Any current selection          shows all the table attributes for that object. Any current selection
782          is lost.          is lost. Objects on the map are typically shapes and this document
783            will often refer to objects as shapes.
784          </para>          </para>
785          </section>          </section>
786    
787          <section><title>Object Labelling</title>          <section><title>Object Labeling</title>
788          <para>          <para>
789          Objects can be labelled using the Label tool          Objects can be labeled using the Label tool
790          <inlinemediaobject>          <inlinemediaobject>
791          <imageobject>          <imageobject>
792          <imagedata fileref="../images/3_3_label.png" format="PNG"/>          <imagedata fileref="../images/3_3_label.png" format="PNG" scale="&imgscale;"/>
793          </imageobject>          </imageobject>
794          <imageobject>          <imageobject>
795          <imagedata fileref="./images/3_3_label.eps" format="EPS"/>          <imagedata fileref="./images/3_3_label.eps" format="EPS" scale="&imgscale;"/>
796          </imageobject>          </imageobject>
797          <textobject> <phrase>Label Tool</phrase> </textobject>          <textobject> <phrase>Label Tool</phrase> </textobject>
798          </inlinemediaobject>.          </inlinemediaobject>.
799          Clicking on an object selects that object and opens a dialog which          Clicking on an object selects that object and opens a dialog which
800          displays the table attributes for that object. An attribute can          displays the table attributes for that object. An attribute can
801          be selected to be the label on the map. Using this tool for an          be selected to be the label on the map. The label will be placed
802          object that already has a label will remove the label.          at the center of the shape. Clicking on an object that already has
803            a label will remove the label.
804          </para>          </para>
805          </section>          </section>
806    
807          <section><title>The Legend</title>          <section><title>The Legend</title>
808            <para>
809            <inlinemediaobject>
810            <imageobject>
811            <imagedata fileref="../images/3_5_legend.png" format="PNG" scale="&imgscale;"/>
812            </imageobject>
813            <imageobject>
814            <imagedata fileref="./images/3_5_legend.eps" format="EPS" scale="&imgscale;"/>
815            </imageobject>
816            <textobject> <phrase>Legend</phrase> </textobject>
817            </inlinemediaobject>
818            </para>
819          <para>          <para>
820          The Legend provides an overview of the layers in the map. Layers          The Legend provides an overview of the layers in the map. Layers
821          that appear higher in the legend will appear ``closer'' to the user.          that appear higher in the legend will appear ``closer'' to the user.
# Line 346  Line 828 
828          <para>          <para>
829          Along the top of the legend is a toolbar which allows quick access          Along the top of the legend is a toolbar which allows quick access
830          to some of the layer manipulation options under          to some of the layer manipulation options under
831          <menuchoice> <guimenu>Map</guimenu> </menuchoice>.          <menuchoice><guimenu>Map</guimenu></menuchoice>.
832            </para>
833    
834            <itemizedlist>
835            <listitem>
836            <para>
837            The Move Layer to Top tool
838            <inlinemediaobject>
839            <imageobject>
840            <imagedata fileref="../images/3_5_totop.png" format="PNG" scale="&imgscale;"/>
841            </imageobject>
842            <imageobject>
843            <imagedata fileref="./images/3_5_totop.eps" format="EPS" scale="&imgscale;"/>
844            </imageobject>
845            <textobject> <phrase>Move Layer to Top</phrase> </textobject>
846            </inlinemediaobject> raises the selected layer to the top of the map.
847            </para>
848            </listitem>
849            <listitem>
850    
851            <para>
852            The Move Layer Up tool
853            <inlinemediaobject>
854            <imageobject>
855            <imagedata fileref="../images/3_5_moveup.png" format="PNG" scale="&imgscale;"/>
856            </imageobject>
857            <imageobject>
858            <imagedata fileref="./images/3_5_moveup.eps" format="EPS" scale="&imgscale;"/>
859            </imageobject>
860            <textobject> <phrase>Move Layer Up</phrase> </textobject>
861            </inlinemediaobject> raises the selected layer one level.
862            </para>
863            </listitem>
864            <listitem>
865    
866            <para>
867            The Move Layer Down tool
868            <inlinemediaobject>
869            <imageobject>
870            <imagedata fileref="../images/3_5_movedown.png" format="PNG" scale="&imgscale;"/>
871            </imageobject>
872            <imageobject>
873            <imagedata fileref="./images/3_5_movedown.eps" format="EPS" scale="&imgscale;"/>
874            </imageobject>
875            <textobject> <phrase>Move Layer Down</phrase> </textobject>
876            </inlinemediaobject> lowers the selected layer one level.
877            </para>
878    
879            </listitem>
880            <listitem>
881            <para>
882            The Move Layer to Bottom tool
883            <inlinemediaobject>
884            <imageobject>
885            <imagedata fileref="../images/3_5_tobottom.png" format="PNG" scale="&imgscale;"/>
886            </imageobject>
887            <imageobject>
888            <imagedata fileref="./images/3_5_tobottom.eps" format="EPS" scale="&imgscale;"/>
889            </imageobject>
890            <textobject> <phrase>Move Layer to Bottom</phrase> </textobject>
891            </inlinemediaobject> lowers the selected layer to the bottom of the map.
892            </para>
893    
894            </listitem>
895            <listitem>
896            <para>
897            The Visible tool
898            <inlinemediaobject>
899            <imageobject>
900            <imagedata fileref="../images/3_5_visible.png" format="PNG" scale="&imgscale;"/>
901            </imageobject>
902            <imageobject>
903            <imagedata fileref="./images/3_5_visible.eps" format="EPS" scale="&imgscale;"/>
904            </imageobject>
905            <textobject> <phrase>Visible</phrase> </textobject>
906            </inlinemediaobject> shows the selected layer in the map if it was
907            hidden.
908            </para>
909    
910            </listitem>
911            <listitem>
912            <para>
913            The Invisible tool
914            <inlinemediaobject>
915            <imageobject>
916            <imagedata fileref="../images/3_5_invisible.png" format="PNG" scale="&imgscale;"/>
917            </imageobject>
918            <imageobject>
919            <imagedata fileref="./images/3_5_invisible.eps" format="EPS" scale="&imgscale;"/>
920            </imageobject>
921            <textobject> <phrase>Invisible</phrase> </textobject>
922            </inlinemediaobject> hides the selected layer in the map.
923            </para>
924    
925            </listitem>
926            <listitem>
927            <para>
928            The Properties tool
929            <inlinemediaobject>
930            <imageobject>
931            <imagedata fileref="../images/3_5_props.png" format="PNG" scale="&imgscale;"/>
932            </imageobject>
933            <imageobject>
934            <imagedata fileref="./images/3_5_props.eps" format="EPS" scale="&imgscale;"/>
935            </imageobject>
936            <textobject> <phrase>Properties</phrase> </textobject>
937            </inlinemediaobject> opens the layer's properties dialog box.
938          Double-clicking on a layer or a group of a layer will open the          Double-clicking on a layer or a group of a layer will open the
939          properties dialog for that layer.          properties dialog for that layer.
940          </para>          </para>
941            </listitem>
942            </itemizedlist>
943    
944            <para>
945            The most used layer related actions are also available from a
946            popup menu. It is raised when a layer is clicked with the right mouse
947            button.
948            </para>
949            
950            <para>
951            <figure>
952            <title>Layer Popup Menu</title>
953            <mediaobject>
954            <imageobject><imagedata fileref="../images/3_5_popup_menu.png" format="PNG" scale="&imgscale;"/></imageobject>
955            <imageobject><imagedata fileref="./images/3_5_popup_menu.eps" format="EPS" scale="&imgscale;"/></imageobject>
956            </mediaobject>
957            </figure>
958            </para>
959    
960            <para>
961            Along the bottom of the legend is the scalebar. The scalebar
962            will be available if there are any layers and the  map has a
963            projection set.
964            </para>
965            </section>
966    
967            <section><title>Exporting</title>
968            <para>
969            Under Windows, maps can be exported in Enhanced Metafile format
970            (<varname>.wmf</varname>)
971            from
972            <menuchoice>
973            <guimenu>Map</guimenu>
974            <guimenuitem>Export</guimenuitem>
975            </menuchoice> for use in reports, presentations, or further
976            modification. The current map view, legend, and, if available,
977            scalebar are exported. Under other platforms this option is not
978            available. Clicking this menu item open a file selection dialog
979            that lets the user select a location to export the map.
980            </para>
981          </section>          </section>
982    
983          <section><title>Printing</title>          <section><title>Printing</title>
# Line 359  Line 986 
986          <menuchoice>          <menuchoice>
987          <guimenu>Map</guimenu>          <guimenu>Map</guimenu>
988          <guimenuitem>Print</guimenuitem>          <guimenuitem>Print</guimenuitem>
989          </menuchoice>. A standard printing dialog will open allowing the          </menuchoice>. The current map view, legend, and, if available,
990          user to configure the printer.          scalebar are printed. A standard printing dialog will open allowing
991            the user to configure the printer. This dialog will differ depending
992            on which platform Thuban is running.
993          </para>          </para>
994          </section>          </section>
995    
996    </chapter>    </chapter>
997    
998    <chapter><title>Layer Management</title>    <chapter><title>Layer Management</title>
# Line 371  Line 1001 
1001    
1002          <section><title>Types of Layers</title>          <section><title>Types of Layers</title>
1003          <para>          <para>
1004          There are two types of layers supported by Thuban: shape layers and          There are three types of layers supported by Thuban: shape layers,
1005            database layers and
1006          image layers. Shape layers consist of vector based shapes with          image layers. Shape layers consist of vector based shapes with
1007          geo-referenced coordinates. There are three types of supported          geo-referenced coordinates. There are three types of supported
1008          shapes: polygons, lines, and points. Image layers can be any image          shapes: polygons, lines (arc), and points. Database layers are similar
1009          file format supported by GDAL. The images must have geographic          to shape layers but loaded from a database instead of the file system.
1010          coordinate data either embedded within the file, or in a seperate          Image layers can be any image
1011            file format supported by the Geo-spatial Data Abstraction Library
1012            (GDAL). The images must have geographic
1013            coordinate data either embedded within the file or in a separate
1014          file that is in the same directory as the image file. GeoTIFF files          file that is in the same directory as the image file. GeoTIFF files
1015          work very well with Thuban and were designed specifically to be image          work very well with Thuban and were designed specifically to be image
1016          layers in GIS programs.          layers in GIS programs.
1017          </para>          </para>
1018            <para>
1019            All actions in the
1020            <menuchoice>
1021            <guimenu>Layer</guimenu>
1022            </menuchoice> menu act on the currently selected layer in the legend.
1023            </para>
1024          </section>          </section>
1025    
1026          <section><title>Properties</title>          <section><title>Properties</title>
1027          <para>          <para>
1028          Each shape in a shape layer can have various properties which control          To view the properties for a layer it must first be selected in the
1029          how it is drawn on the map. Polygons and points can be drawn with an          legend. The menu option
1030          outline color and a fill color, while lines have only a line color.          <menuchoice>
1031            <guimenu>Layer</guimenu>
1032            <guimenuitem>Properties</guimenuitem>
1033            </menuchoice> opens a dialog that displays a layer's properties.
1034            All layers have a title which can be modified in the text field
1035            provided. The type of layer is also shows. If the type is a type
1036            of shape (polygon, arc, point) the classification table will be
1037            shown. Image layers have no other properties other than title
1038            and type.
1039            </para>
1040            <para>
1041            <figure>
1042            <title>Properties Window</title>
1043            <mediaobject>
1044            <imageobject><imagedata fileref="../images/4_2_layer_properties.png" format="PNG" scale="&imgscale;"/></imageobject>
1045            <imageobject><imagedata fileref="./images/4_2_layer_properties.eps" format="EPS" scale="&imgscale;"/></imageobject>
1046            </mediaobject>
1047            </figure>
1048            </para>
1049            <para>
1050            <figure>
1051            <title>Properties Window</title>
1052            <mediaobject>
1053            <imageobject><imagedata fileref="../images/4_2_raster_layer_properties.png" format="PNG" scale="&imgscale;"/></imageobject>
1054            <imageobject><imagedata fileref="./images/4_2_raster_layer_properties.eps" format="EPS" scale="&imgscale;"/></imageobject>
1055            </mediaobject>
1056            </figure>
1057          </para>          </para>
1058          </section>          </section>
1059    
# Line 396  Line 1062 
1062          Sometimes it is not desirable to view all layers at the same time.          Sometimes it is not desirable to view all layers at the same time.
1063          Some layers may take a long time to draw and so while navigating          Some layers may take a long time to draw and so while navigating
1064          around the map the user may not want to wait for the map to redraw          around the map the user may not want to wait for the map to redraw
1065          each time the map is changed. Each layer can be independently          all the layers each time the map is changed. Each layer can be
1066          turned on or off using the          independently turned on or off using the
1067          <menuchoice>          <menuchoice>
1068          <guimenu>Layer</guimenu>          <guimenu>Layer</guimenu>
1069          <guimenuitem>Show</guimenuitem>          <guimenuitem>Show</guimenuitem>
# Line 410  Line 1076 
1076          </para>          </para>
1077          </section>          </section>
1078    
         <section><title>Sequence</title>  
         <para>  
         </para>  
         </section>  
   
1079          <section><title>Duplication</title>          <section><title>Duplication</title>
1080          <para>          <para>
1081          Layers and all their properties, including classifications, can          Layers and all their properties, including classifications, can
# Line 424  Line 1085 
1085          <guimenuitem>Duplicate</guimenuitem>          <guimenuitem>Duplicate</guimenuitem>
1086          </menuchoice>. Duplicating a layer is useful if the user wishes          </menuchoice>. Duplicating a layer is useful if the user wishes
1087          to model a layer in several different ways. Even though the layers          to model a layer in several different ways. Even though the layers
1088          overlap by carefully selecting the shape properties it is possible          overlap, by carefully selecting the shape properties it is possible
1089          to display several pieces of information at once. For example, one          to display several pieces of information at once. For example, one
1090          copy of a roads layer may be classified on a length property and          copy of a roads layer may be classified on a length property and
1091          another copy may be classified on a type property. if the length          another copy may be classified on a type property. If the length
1092          property was expressed with color and the type property expressed          property was expressed with color and the type property expressed
1093          with line thickness then it would be possible to view both          with line thickness then it would be possible to view both
1094          classifications by placing the type property copy over the          classifications by placing the type property copy over the
# Line 445  Line 1106 
1106      cannot be classified.      cannot be classified.
1107      </para>      </para>
1108      <para>      <para>
1109      A classification consists of a number of groups, with each group      A classification consists of a number of groups, each group
1110      having a value or range of values to match against, and symbol      having a value or range of values to match against, and symbol
1111      properties which control how a shape is drawn on the map. The user      properties which control how a shape is drawn on the map. The user
1112      selects which field in the table is used by the classification and      selects which field in the table is used by the classification and
# Line 458  Line 1119 
1119      <para>      <para>
1120      A layer always has a classification. When a new layer is added to the      A layer always has a classification. When a new layer is added to the
1121      map, a default classification is created with the DEFAULT group. This      map, a default classification is created with the DEFAULT group. This
1122      group cannot be removed. Every shape in the layer, regardless of its      group cannot be removed but can be hidden (see below). Every shape in the
1123      attributes, will match this group.      layer, regardless of its attributes, will match this group if no other
1124        group matches.
1125      </para>      </para>
1126    
1127          <section><title>Editing Classifications</title>          <section><title>Editing Classifications</title>
# Line 476  Line 1138 
1138          button.          button.
1139          </para>          </para>
1140          <para>          <para>
1141            To apply the changes to the map the user can click
1142            either <guibutton>Try</guibutton> or <guibutton>OK</guibutton>.
1143            <guibutton>Try</guibutton> will not close the dialog box, allowing
1144            the user to see how the classification changes the map.
1145            <guibutton>Revert</guibutton> will undo the last classification applied
1146            to the map. <guibutton>OK</guibutton> will commit the changes and
1147            close the dialog. The user will be unable to undo the changes.
1148            <guibutton>Close</guibutton> simply closes the dialog box. If any
1149            changes have not been applied with <guibutton>Try</guibutton> the
1150            changes will not be applied to the map.
1151            </para>
1152            <para>
1153            <figure>
1154            <title>Properties Window</title>
1155            <mediaobject>
1156            <imageobject><imagedata fileref="../images/5_classification.png" format="PNG" scale="&imgscale;"/></imageobject>
1157            <imageobject><imagedata fileref="./images/5_classification.eps" format="EPS" scale="&imgscale;"/></imageobject>
1158            </mediaobject>
1159            </figure>
1160            </para>
1161            <para>
1162          The order of the groups in the classification is significant          The order of the groups in the classification is significant
1163          except for the DEFAULT group, which remains at the top. When shapes          except for the DEFAULT group, which remains at the top. When shapes
1164          are matched against groups the matching begins at the first group          are matched against groups the matching begins at the first group
1165          other than the DEFAULT group so that groups higher in the list will          after the DEFAULT group so that groups higher in the list will
1166          be checked first. Matching for a          be checked first. Matching for a
1167          given shape will stop at the first group that matches. The user can          given shape will stop at the first group that matches. The user can
1168          use <guibutton>Move Up</guibutton> and <guibutton>Move Down</guibutton>          use <guibutton>Move Up</guibutton> and <guibutton>Move Down</guibutton>
1169          to change the order of the groups. The DEFAULT group will always          to change the order of the groups. The DEFAULT group will always
1170          match a shape that hasn't matched another group.          match a shape that hasn't matched another group.
1171          </para>          </para>
1172          <para>              <section><title>Visible</title>
1173          The Value column of the classification table is the value that will              <para>
1174          be matched when the map is being drawn. The type of data that can              The Visible column has check-boxes that determine whether a
1175          entered into this field depends on the type of data of the              classification group will be displayed in the legend. This is
1176          classification field.              useful if the user knows that the groups completely cover
1177          </para>              the data set and don't want the DEFAULT group to be displayed
1178          <para>              in the legend and on a printout.
1179          If the field is of type Text, anything entered              </para>
1180          into the field is valid. The text will be compared literally to the          </section>
1181          value of the shape attribute, including case sensitivity.              <section><title>Symbols</title>
1182          If the type is Integer, then any valid integer may be entered. In              <para>
1183          addition, with special syntax, a range of values can be entered.              Each type of shape has its own type of symbol. Thuban supports three
1184          A range from <varname>start</varname> to <varname>end</varname>              types of shapes: polygons, lines, and points. Polygons and points
1185          inclusive is specifed like this: <literal>[start;end]</literal>.              have outline and fill color, while lines have only line color. Each
1186          The exclusive range is specified like this:              group has associated symbol properties. To edit the symbol
1187          <literal>]start;end[</literal>. Ranges can include infinity like              properties for a group the user can double click on the Symbol
1188          this: <literal>[-oo;oo]</literal>. Field types can also be of type              column or select a group and click the
1189          Decimal. They represent any rational number and can be used in ranges              <guibutton>Edit Symbol</guibutton> button.
1190          as well.              </para>
1191          </para>              </section>
1192          </section>          <section><title>Value</title>
1193                <para>
1194          <section><title>Symbols</title>              The Value column of the classification table is the value that will
1195          <para>              be matched when the map is being drawn. The type of data that can
1196          Each type of shape has its own type of symbol. Thuban supports three              entered into this field depends on the type of data of the
1197          types of shapes: polygons, lines, and points. Polygons and points have              classification field.
1198          outline and fill color, while lines have only line color. Each group              </para>
1199          has associated symbol properties. To edit the symbol properties for a              <para>
1200          group the user can double click on the Symbol column or select a              If the field is of type Text, anything entered
1201          group and click the <guibutton>Edit Symbol</guibutton> button.              into the field is valid. The text will be compared literally to the
1202          </para>              value of the shape attribute, including case sensitivity.
1203                If the type is Integer, then any valid integer may be entered. In
1204                addition, with special syntax, a range of values can be entered.
1205                A range from <varname>start</varname> to <varname>end</varname>
1206                inclusive is specified like this: <literal>[start;end]</literal>.
1207                The exclusive range is specified like this:
1208                <literal>]start;end[</literal>. Ranges can include infinity like
1209                this: <literal>[-oo;oo]</literal>. Field types can also be of type
1210                Decimal. They represent any rational number and can be used in
1211                ranges as well.
1212                </para>
1213                </section>
1214                <section><title>Label</title>
1215                <para>
1216                By default, the text that is displayed for a group in the legend
1217                is the value for that group. The label can substitute a more
1218                descriptive term in the legend.
1219                </para>
1220            </section>
1221          </section>          </section>
1222    
1223          <section><title>Generating Classes</title>          <section><title>Generating Classes</title>
1224          <para>          <para>
1225            <figure>
1226            <title>Generate Class</title>
1227            <mediaobject>
1228            <imageobject><imagedata fileref="../images/5_3_genclass.png" format="PNG" scale="&imgscale;"/></imageobject>
1229            <imageobject><imagedata fileref="./images/5_3_genclass.eps" format="EPS" scale="&imgscale;"/></imageobject>
1230            </mediaobject>
1231            </figure>
1232            </para>
1233            <para>
1234          Creating a classification by hand can be tedious.          Creating a classification by hand can be tedious.
1235          Thuban, therefore, provides a means of generating an entire          Thuban, therefore, provides a means of generating an entire
1236          classification at once while still giving the user control over          classification at once while still giving the user control over
1237          how it appears. Clicking <guibutton>Generate Class</guibutton>          how it appears. Clicking <guibutton>Generate Class</guibutton>
1238          opens the <varname>Generate Classification</varname> dialog.          opens the <varname>Generate Classification</varname> dialog.
1239          Under the <varname>Generate</varname> pulldown there are at most          Under the <varname>Generate</varname> pull down there are at most
1240          three different ways to generate classifications:          three different ways to generate classifications:
1241          Unique Values, Unique Distribution, and Quantiles. Some options          Unique Values, Uniform Distribution, and Quantiles. Some options
1242          may not be available if they data type for the field does not          may not be available if the data type for the field does not
1243          support them. For instance, <varname>Unique Distribution</varname>          support them. For instance, <varname>Uniform Distribution</varname>
1244          doesn't make sense for a Text field.          doesn't make sense for a Text field.
1245          </para>          </para>
1246          <para>          <para>
1247          For every way of generating a classification, a color scheme must          For every way of generating a classification, a color scheme must
1248          be selected. Thuban provides several different color schemes that          be selected. Thuban provides several different color schemes that
1249          affect how the group properties change over the classification.          affect how the group properties change over the classification.
1250            It may be desirable that only certain properties change over the
1251            classification. If the shape type is a polygon or a point then
1252            the <guibutton>Fix Border Color</guibutton> option will be available.
1253            This allows the user to select a border color for all classification
1254            groups.
1255          It is also possible to create a custom color scheme. Selecting          It is also possible to create a custom color scheme. Selecting
1256          this option will display two symbols: the one of the left has the          this option will display two symbols: the one of the left has the
1257          properties of the first group and the one on the right has the          properties of the first group and the one on the right has the
1258          properties of the last group. Thuban will interpolate between these          properties of the last group. Thuban will interpolate between these
1259          two properties to generate the other groups.          two properties to generate the other groups.
1260            <figure>
1261            <title>Custom Color Scheme</title>
1262            <mediaobject>
1263            <imageobject><imagedata fileref="../images/5_2_custom_ramp.png" format="PNG" scale="&imgscale;"/></imageobject>
1264            <imageobject><imagedata fileref="./images/5_2_custom_ramp.eps" format="EPS" scale="&imgscale;"/></imageobject>
1265            </mediaobject>
1266            </figure>
1267          </para>          </para>
1268          <para>          <para>
1269          The Unique Values option lets the user select specific values that          The Unique Values option lets the user select specific values that
# Line 551  Line 1273 
1273          right. Each list can be sorted or reversed for easier searching.          right. Each list can be sorted or reversed for easier searching.
1274          The classification that is generated will be in the same order as          The classification that is generated will be in the same order as
1275          the list on the right.          the list on the right.
1276            <figure>
1277            <title>Unique Values</title>
1278            <mediaobject>
1279            <imageobject><imagedata fileref="../images/5_2_unique_values.png" format="PNG" scale="&imgscale;"/></imageobject>
1280            <imageobject><imagedata fileref="./images/5_2_unique_values.eps" format="EPS" scale="&imgscale;"/></imageobject>
1281            </mediaobject>
1282            </figure>
1283          </para>          </para>
1284          <para>          <para>
1285          The Unique Distribution option creates a user specified number of          The Uniform Distribution option creates a user specified number of
1286          groups of ranges such that each range covers equal intervals. The          groups of ranges such that each range covers equal intervals. The
1287          minimum and maximum values can automatically be retrieved from the          minimum and maximum values can automatically be retrieved from the
1288          table by clicking <guibutton>Retrieve From Table</guibutton>. The          table by clicking <guibutton>Retrieve From Table</guibutton>. The
1289          stepping is how large each interval is. Adjusting this value will          stepping is how large each interval is. Adjusting this value will
1290          automatically recalculate how many groups is appropriate.          automatically recalculate how many groups is appropriate.
1291            <figure>
1292            <title>Uniform Distribution</title>
1293            <mediaobject>
1294            <imageobject><imagedata fileref="../images/5_2_uniform_dist.png" format="PNG" scale="&imgscale;"/></imageobject>
1295            <imageobject><imagedata fileref="./images/5_2_uniform_dist.eps" format="EPS" scale="&imgscale;"/></imageobject>
1296            </mediaobject>
1297            </figure>
1298          </para>          </para>
1299          <para>          <para>
1300          The Quantiles option generates ranges based on the number items          The Quantiles option generates ranges based on the number of items
1301          in the input set. For example, by specifying 5 groups Thuban will          in the table. For example, by specifying five groups Thuban will
1302          generate groups with appropriate ranges such that 20% of the table          generate five groups with appropriate ranges such that 20% of the table
1303          data is in each group. If it is impossible to generate exact          data is in each group. If it is impossible to generate exact
1304          grouping, Thuban will issue a warning but allow the user to continue.          groupings, Thuban will issue a warning but allow the user to continue.
1305            <figure>
1306            <title>Quantiles</title>
1307            <mediaobject>
1308            <imageobject><imagedata fileref="../images/5_2_quantiles.png" format="PNG" scale="&imgscale;"/></imageobject>
1309            <imageobject><imagedata fileref="./images/5_2_quantiles.eps" format="EPS" scale="&imgscale;"/></imageobject>
1310            </mediaobject>
1311            </figure>
1312          </para>          </para>
1313          </section>          </section>
1314    </chapter>    </chapter>
# Line 574  Line 1317 
1317      <para>      <para>
1318      Projections control how the geographic data is displayed on the screen.      Projections control how the geographic data is displayed on the screen.
1319      If multiple layers are loaded into Thuban where the geographic data      If multiple layers are loaded into Thuban where the geographic data
1320      is in a different projection system, then the user must tell Thuban      is in a different projection system, then the user must specify a
1321      which projection each layer has. The user must also tell Thuban which      projection for each layer. The user must also tell Thuban which
1322      projection the map is in. This can be the same as the layers or a different      projection the map is in. This can be the same as the layers or a different
1323      projection in which case the layers are reprojected into that space.      projection in which case the layers are reprojected into that space.
1324      The map projection can be set using      The map projection can be set using
# Line 587  Line 1330 
1330      <guimenu>Layer</guimenu>      <guimenu>Layer</guimenu>
1331      <guimenuitem>Projection</guimenuitem>      <guimenuitem>Projection</guimenuitem>
1332      </menuchoice>.      </menuchoice>.
1333        <figure>
1334        <title>Projection Window</title>
1335        <mediaobject>
1336        <imageobject><imagedata fileref="../images/6_projection.png" format="PNG" scale="&imgscale;"/></imageobject>
1337        <imageobject><imagedata fileref="./images/6_projection.eps" format="EPS" scale="&imgscale;"/></imageobject>
1338        </mediaobject>
1339        </figure>
1340        </para>
1341        <para>
1342        Thuban is distributed with a sample collection of projections and the
1343        set of coordinate systems as used by the EPSG
1344        (European Petroleum Survey Group). This quite large set is only displayed
1345        if activated by the according checkbox. The set falls into two parts:
1346        deprecated lists all projections which are no longer part of the
1347        EPSG data base.
1348      </para>      </para>
1349      <para>      <para>
1350      Thuban is distributed with a sample collection of projections. The           The
1351      user can create new projections and make them available to all      user can create new projections and make them available to all
1352      future Thuban sessions. They may also be exported and imported so      future Thuban sessions. They may also be exported and imported so
1353      that custom projections can be distributed to others.      that custom projections can be distributed.
1354      </para>      </para>
1355          <section><title>Selecting a Projection</title>          <section><title>Selecting a Projection</title>
1356          <para>          <para>
1357          The available projections are listed on the left. If the layer          The available projections are listed on the left. If the layer
1358          or map already has a projection it will be initially highlighted          or map already has a projection it will initially be highlighted
1359          and will end with <varname>(current)</varname>. Selecting          and will end with <varname>(current)</varname>. Selecting
1360          <varname>None</varname> will cause Thuban to use the data as          <varname>&lt;None&gt;</varname> will cause Thuban to use the data as
1361          it appears in the source file and will not use a projection.          it appears in the source file and will not use a projection.
1362          </para>          </para>
1363      </section>      </section>
# Line 608  Line 1366 
1366          Whenever a projection is selected from the list its properties          Whenever a projection is selected from the list its properties
1367          are displayed on the right. These properties can be changed          are displayed on the right. These properties can be changed
1368          and the changes saved to the selected projection using          and the changes saved to the selected projection using
1369          the <guibutton>Update</guibutton>. Only a projection that comes          <guibutton>Update</guibutton>. Only a projection that comes
1370          from a file can be updated, so if the current layer's projection          from a file can be updated, so if the current layer's projection
1371          is selectd, <guibutton>Update</guibutton> will be disabled.          is selected, <guibutton>Update</guibutton> will be disabled.
1372          The <guibutton>Add to List</guibutton> adds the projection to the          <guibutton>Add to List</guibutton> adds the projection to the
1373          list of available projections as a new entry, and thus make it          list of available projections as a new entry, and thus makes it
1374          available to future Thuban sessions. Clicking <guibutton>New</guibutton>          available to future Thuban sessions. Clicking <guibutton>New</guibutton>
1375          will create an entirely new, empty projection. The          will create an entirely new, empty projection. The
1376          <guibutton>Remove</guibutton> button will permanantly remove a          <guibutton>Remove</guibutton> button will permanently remove a
1377          projection from the list of available projections.          projection from the list of available projections.
1378          </para>          </para>
1379            <para>
1380            To apply the selected projection to the map the user can click
1381            either <guibutton>Try</guibutton> or <guibutton>OK</guibutton>.
1382            <guibutton>Try</guibutton> will not close the dialog box, allowing
1383            the user to see how the projeciton changes the map.
1384            <guibutton>Revert</guibutton> will undo the last projection applied
1385            to the map. <guibutton>OK</guibutton> will commit the changes and
1386            close the dialog. The user will be unable to undo the changes.
1387            <guibutton>Close</guibutton> simply closes the dialog box. If no
1388            selection has been applied with <guibutton>Try</guibutton> the
1389            selection will not be applied to the map.
1390            </para>
1391      </section>      </section>
1392          <section><title>Importing/Exporting Projections</title>          <section><title>Importing/Exporting Projections</title>
1393          <para>          <para>
1394          The projections that appear in the list of available projections          The projections that appear in the list of available projections
1395          can be exported to another file that the user chooses. By selecting          can be exported to another file that the user chooses. By selecting
1396          one or more projections and clicking <guibutton>Export</guibutton>          one or more projections and clicking <guibutton>Export</guibutton>
1397          the user will be able to select a file to store those projections.          the user will be able to select a file in which to store those
1398            projections.
1399          The file can then be distributed to other Thuban users. To import          The file can then be distributed to other Thuban users. To import
1400          a projection file the user can click <guibutton>Import</guibutton>.          a projection file the user can click <guibutton>Import</guibutton>.
1401          The imported projections are added to the list and are then available          The imported projections are added to the list and are then available
1402          to the current session and any future Thuban session.          to the current session and any future Thuban sessions.
1403          </para>          </para>
1404      </section>      </section>
1405    </chapter>    </chapter>
1406    
1407    <chapter><title>Table Management</title>    <chapter><title>Table Management</title>
1408      <para>      <para>
1409              Thuban distinguishes two different types of tables: Attribute tables      Thuban distinguishes two different types of tables: Attribute tables
1410              (which belong to a layer) and usual data tables. Both provide in      (which belong to a layer) and normal data tables. Both provide
1411          general the same functionality with the difference that actions on an          the same general functionality with the difference that actions on an
1412              attribute table might also effect the map display.      attribute table might also effect the map display.
1413      </para>      </para>
1414    
1415      <section><title>Table View</title>      <section><title>Table View</title>
1416        <para>          <para>
1417            <figure>
1418            <title>Table View</title>
1419            <mediaobject>
1420            <imageobject><imagedata fileref="../images/7_1_table_view.png" format="PNG" scale="&imgscale;"/></imageobject>
1421            <imageobject><imagedata fileref="./images/7_1_table_view.eps" format="EPS" scale="&imgscale;"/></imageobject>
1422            </mediaobject>
1423            </figure>
1424            </para>
1425            <para>
1426          Thuban provides a standard dialog to display table contents, the          Thuban provides a standard dialog to display table contents, the
1427          Table View. The view falls into five sections: The title, selections,          Table View. The view has five sections: The title, selections,
1428          the table grid, export functions and the status bar.          the table grid, export functions, and the status bar.
1429        </para>          </para>
1430        <para>          <para>
1431          The title bar identifies the table with it's name.          The title bar identifies the table with its name.
1432        </para>          </para>
1433        <para>          <para>
1434          The functions box let the user perform simple analysis on the data          The selections box let the user perform simple analysis on the data
1435          based on comparisons: First choice must be a field identifier of the          based on comparisons: The first choice must be a field identifier of
1436          table, the second choice determines the type of comparison. The third          the table, the second choice determines the type of comparison. The
1437          choice can be either a specific value (interpreted as numerical          third choice can be either a specific value (interpreted as numerical
1438          or string depending on the type of the first field) or a second field          or string depending on the type of the first field) or a second field
1439          identifier. Thus you can perform analysis like selecting all          identifier. Thus you can perform analysis like selecting all
1440          records where "population > 10000" or          records where <literal>population > 10000</literal> or
1441          "cars_per_habitants <  bike_per_habitants" (note that the field names          <literal>cars_per_inhabitant < bikes_per_inhabitant</literal>
1442          are only explanatory, the currently considered dbase files allow only          (note that the field names are only explanatory, the dBase files
1443          11 character field names).          allow only 11 character field names).
1444                  
1445          Selections can be combined, either by applying a selection only on          Selections can be combined either by applying a selection only on
1446          a previously selected set of records or by adding the results of a          a previously selected set of records or by adding the results of a
1447          selection to a previous set. The default is that a selection replaces          selection to a previous set. The default is that a selection replaces
1448          earlier results.          earlier results.
1449        </para>          </para>
1450        <para>          <para>
1451          The table grid shows the contents of the table (a record per column),          The table grid shows the contents of the table (one record per row),
1452          with highlighted selection results. Columns and rows can be resized.          with highlighted selection results. Columns and rows can be resized.
1453        </para>          </para>
1454        <para>          <para>
1455          The contents of a table can be exported into a file, either dbase          The contents of a table can be exported into a file, either dBase
1456          format (DBF) or comma seperated values (CSV). The 'Export' button          format (DBF) or comma separated values (CSV). The
1457            <guibutton>Export</guibutton> button
1458          raises a file dialog to specify a path and file name, the export type          raises a file dialog to specify a path and file name, the export type
1459          is determined by the file extension (either .dbf or .csv).          is determined by the file extension (either .dbf or .csv).
1460    
1461          The 'Export Selection' button works similar but exports only the          The <guibutton>Export Selection</guibutton> button works similarly
1462          selected records.          but exports only the selected records.
1463    
1464          The 'Close' button closes the table view. In difference to the          The <guibutton>Close</guibutton> button closes the table view window.
1465          menu item 'Close' just the dialog is closed, the table is still loaded          This is different from the menu item
1466          in Thuban.          <menuchoice>
1467        </para>          <guimenu>Table</guimenu>
1468        <para>          <guimenuitem>Close</guimenuitem>
1469            </menuchoice> which unloads the table from Thuban.
1470            </para>
1471            <para>
1472          The status bar displays some statistics about the table and optional          The status bar displays some statistics about the table and optional
1473          selection results.          selection results.
1474        </para>          </para>
1475      </section>      </section>
1476    
1477      <section><title>General Functionality (Menu Table)</title>      <section><title>General Functionality (Menu Table)</title>
1478        <para>          <para>
1479          The general functions affect all tables open in Thuban. Attribute          The general functions affect all tables open in Thuban. Attribute
1480          tables are considered as here as usual data tables (with the exception          tables are considered here as normal data tables (with the exception
1481          that they cannot be closed).          that they cannot be closed).
       </para>  
       <section><title>Open</title>  
         <para>  
           The 'Open' item raises a file dialog to let you select a  
           dbase file from the file system to be loaded into Thuban read-only.  
           On OK the selected file is loaded and a table view is opened.  
         </para>  
       </section>  
   
       <section><title>Close</title>  
         <para>  
           The 'Close' item raises a dialog listing the currently open  
           data tables (loaded via the 'Open' functionality'). You can select  
           tables which are dereferenced on confirmation. Since tables are  
           opened read-only the contents of the tables are not affected.  
   
           A still open table view is closed as well.  
   
           Tables used in a join can not be closed.  
1482          </para>          </para>
1483        </section>          <section><title>Open</title>
1484                <para>
1485        <section><title>Rename</title>              The
1486          <para>              <menuchoice>
1487            Changes the table title.              <guimenu>Table</guimenu>
1488          </para>              <guimenuitem>Open</guimenuitem>
1489        </section>              </menuchoice>
1490                item raises a file dialog to let you select a
1491        <section><title>Show</title>              dBase file from the file system to be loaded into Thuban read-only.
1492          <para>              On <guibutton>OK</guibutton> the selected file is loaded and a
1493            The 'Show' item raises a list of available tables (explicitly loaded,           attribute tables, results of a join). Selected tables are show in              table view is opened.
1494            tables views on 'OK'.                        </para>
1495          </para>          </section>
1496        </section>  
1497            <section><title>Close</title>
1498        <section><title>Join</title>              <para>
1499          <para>              The
1500            The 'Join' item raises a dialog to specify the two tables to be              <menuchoice>
1501            joined. The join results in a new table named 'Join of "left table"              <guimenu>Table</guimenu>
1502            and "right table"'.              <guimenuitem>Close</guimenuitem>
1503                </menuchoice>
1504            The dialog let you select the two tables to be joined and the two              item raises a dialog listing the currently open
1505            fields the join has to be performed on. By default the new              data tables
1506            table contains only those records which are mathced by the join.              (loaded via
1507                <menuchoice>
1508            If you want to preserve the records of the left table you can perform              <guimenu>Table</guimenu>
1509            an outer join. The fields from the right table for records not              <guimenuitem>Open</guimenuitem>
1510            matched by the join are filled with <varname>None</varname> in this              </menuchoice>). Selected tables are dereferenced on confirmation.
1511            case.              Since tables are opened read-only the contents of the tables are
1512          </para>              not affected.
1513        </section>  
1514                Any open views of the tables are closed as well.
1515    
1516                Tables used in a join cannot be closed.
1517                </para>
1518            </section>
1519    
1520            <section><title>Rename</title>
1521                <para>
1522                <menuchoice>
1523                <guimenu>Table</guimenu>
1524                <guimenuitem>Rename</guimenuitem>
1525                </menuchoice> changes the table title.
1526                </para>
1527            </section>
1528    
1529            <section><title>Show</title>
1530                <para>
1531                The
1532                <menuchoice>
1533                <guimenu>Table</guimenu>
1534                <guimenuitem>Show</guimenuitem>
1535                </menuchoice>
1536                item raises a list of available tables (explicitly
1537                loaded, attribute tables, results of a join). Selected tables are
1538                show in tables views on <guibutton>OK</guibutton>.
1539                </para>
1540            </section>
1541    
1542            <section><title>Join</title>
1543                <para>
1544                <figure>
1545                <title>Join Tables</title>
1546                <mediaobject>
1547                <imageobject><imagedata fileref="../images/7_2_5_join.png" format="PNG" scale="&imgscale;"/></imageobject>
1548                <imageobject><imagedata fileref="./images/7_2_5_join.eps" format="EPS" scale="&imgscale;"/></imageobject>
1549                </mediaobject>
1550                </figure>
1551                </para>
1552                <para>
1553                The
1554                <menuchoice>
1555                <guimenu>Table</guimenu>
1556                <guimenuitem>Join</guimenuitem>
1557                </menuchoice>
1558                item raises a dialog to specify the two tables to be
1559                joined. The join results in a new table named 'Join of "left table"
1560                and "right table"'.
1561    
1562                The dialog lets you select the two tables to be joined and the two
1563                fields the join has to be performed on. By default, the new
1564                table contains only those records which are matched by the join.
1565    
1566                If you want to preserve the records of the left table you can
1567                perform an outer join. The fields from the right table for records
1568                not matched by the join are filled with <varname>None</varname> in
1569                this case.
1570                </para>
1571            </section>
1572    
1573      </section>      </section>
1574      <section><title>Attribute Tables</title>      <section><title>Attribute Tables</title>
     <para>  
             To clearly separate between both types, Thuban provides functionality  
             regarding the attribute tables under the Layer menu.  
     </para>  
   
       <section><title>Show Table</title>  
1575          <para>          <para>
1576            Opens the attribute table of the currently active layer in a table              To clearly separate between both types of tables (data and
1577            view.          attribute), Thuban provides functionality regarding the attribute
1578            tables under the <menuchoice><guimenu>Layer</guimenu></menuchoice> menu.
1579            In addition to the functionality described above selections          </para>
1580            affect also the map display: objects related to selected records  
1581            are highlighted.          <section><title>Show Table</title>
1582          </para>              <para>
1583        </section>              <menuchoice>
1584                <guimenu>Layer</guimenu>
1585        <section><title>Join Table</title>              <guimenuitem>Show Table</guimenuitem>
1586          <para>              </menuchoice>
1587             In difference to the join described above the join results not in a              opens the attribute table of the currently active layer in a table
1588                view.
1589    
1590                In addition to the functionality described above selections
1591                affect also the map display: objects related to selected records
1592                are highlighted.
1593                </para>
1594            </section>
1595    
1596            <section><title>Join Table</title>
1597                <para>
1598                Unlike the join described above, the join does not result in a
1599              new table. The attribute table of the currently active layer is the              new table. The attribute table of the currently active layer is the
1600              left table and other tables are join to this table. Results of the              left table and other tables are joined to this table. The results of
1601              join in turn are available for classifications.              the join are available for classification.
   
             As a consequence of the above the join cannot result in less  
             records than the source attribute table. You are warned if the  
             right table does not fulfill this constraint. Use an outer join  
             in such cases.  
         </para>  
       </section>  
1602    
1603        <section><title>Unjoin Table</title>              As a consequence, the join cannot result in fewer
1604          <para>              records than the source attribute table. The user is warned if the
1605              As said above, a usual table can not be closed while still used in              right table does not fulfill this constraint. An outer join must be
1606              a join. While the join table resulting from a join of usual tables              used in such cases.
1607              can be simply closed (and therewith dereferences the source tables)              </para>
1608              this is not possible for attribute tables.          </section>
1609    
1610              Hence joins on attribute tables must be solved explicitely. This is          <section><title>Unjoin Table</title>
1611              what the 'Unjoin' item is used for: The last join for the currently              <para>
1612                As said above, a normal table cannot be closed while it is still
1613                used in a join. While the joined table resulting from a join of
1614                normal tables can be simply closed (and thereby dereferencing
1615                the source tables), this is not possible for attribute tables.
1616    
1617                Hence joins on attribute tables must be solved explicitly. This is
1618                what the
1619                <menuchoice>
1620                <guimenu>Layer</guimenu>
1621                <guimenuitem>Unjoin Table</guimenuitem>
1622                </menuchoice>
1623                item is used for: The last join for the currently
1624              active layer is solved.              active layer is solved.
1625          </para>              </para>
1626        </section>          </section>
   
1627      </section>      </section>
1628    </chapter>    </chapter>
1629    
1630      <chapter><title>Extensions</title>
1631            <para>
1632            Thuban is designed to be extensible. The term Extension is used as a
1633            general term for anything that extends Thuban.
1634            This chapter introduces into some oppportunities how to add and
1635            handle extra functionality developed by your own or third parties.
1636            </para>
1637    
1638            <section><title>Add personal extensions via thubanstart.py</title>
1639                    <para>
1640                    After Thuban has been started for the first time, a directory
1641                    .thuban is created within your home directory.
1642                    There you can add a file thubanstart.py  which will be imported
1643                    by Thuban at start-up. It is recommended to add only import-statements
1644                    to this file to keep the actual code of extensions separate.
1645                    </para>
1646                    <para>
1647                    The modules to import must either be found through the environment
1648                    variable PYTHONPATH or directly be placed into the .thuban-directory.
1649                    </para>
1650                    <para>
1651                    As an example, copy the file examples/simple_extensions/hello_world.py
1652                    of the Thuban source code into the .thuban-directory of your home
1653                    directory. Now add add the statement import hello_world to the
1654                    file thubanstart.py and run Thuban. You will notice an additional
1655                    menu <menuchoice><guimenu>Extensions</guimenu></menuchoice> where
1656                    the new item for the Hello-World extension is placed - select it
1657                    to see the Hello-World message.
1658                    </para>
1659            </section>
1660    
1661            <section><title>Extensions included in Thuban package</title>
1662                    <para>
1663                    The extensions described in this section are part of the
1664                    Thuban package, but not activated by default.
1665                    You will find them in the Thuban installation directory
1666                    under <literal>Extensions/</literal>. Activate them as personal
1667                    extensions via PYTHONPATH as described in the previous section.
1668                    Stable extensions will appear under the menu
1669                    <menuchoice><guimenu>Extensions</guimenu></menuchoice> and
1670                    extensions which are in experimental state and therefore
1671                    not fully functional under
1672                    <menuchoice><guimenu>Experimental</guimenu></menuchoice>.
1673                    </para>
1674    
1675                    <section><title>Stable extensions</title>
1676                            <para>
1677                            These extensions provide extra-functionality to Thuban
1678                            that has not (yet) been integrated in the main application.
1679                            They are considered to be free of bugs, but may be
1680                            further polished with helpful user interactions.
1681                            </para>
1682                            <section><title>gns2shp</title>
1683                                    <para>
1684                                    This tool converts data of the Geospatial Names Server
1685                                    (GNS, see <ulink url="http://www.nima.mil/gns"/>)
1686                                    into Shapefile format.
1687                                    The above web-site offer to download named places
1688                                    information grouped by countries for all of the world
1689                                    except USA for which other data are provided.
1690                                    </para>
1691                                    <para>
1692                                    If you download and unpack a package, you will have
1693                                    a text-file with suffix .txt.
1694                                    Selecting such a file via gns2shp will create the
1695                                    corresponding Shapefile with the same basename and
1696                                    place it in the same direcory. Afterwards it
1697                                    is automatically loaded into Thuban.
1698                                    The Shapefile will not automatically be delete afterwards.
1699                                    </para>
1700                                    <para>
1701                                    The gns2shp.py module can also be executed on the
1702                                    command line for batch processing purposes.
1703                                    </para>
1704                                    <para>
1705                                    A sample (<literal>ls.txt</literal> for Liechtenstein)
1706                                    is included in the directory
1707                                    <literal>Extensions/gns2shp/test</literal>.
1708                                    </para>
1709                            </section>
1710                    </section>
1711                    <section><title>Experimental extensions</title>
1712                            <para>
1713                            All all of these functions have to be handled with care,
1714                            since they are neither complete nor well tested.
1715                            They are to be seen as a proof-of-concept and may
1716                            additionally in some cases of practical help.
1717                            </para>
1718                            <para>
1719                            Any interest on further improvement of these extensions
1720                            should be communicated towards the developer and user
1721                            community.
1722                            </para>
1723    
1724                            <section><title>importAPR</title>
1725                                    <para>
1726                                    This command offer to load an ESRI� ArcView� project
1727                                    file (suffix .apr) and convert it for use within Thuban.
1728                                    After selecting a apr-file to load, a list
1729                                    will be presented that offers to select one of the views
1730                                    of the apr-file, provided there is more than one.
1731                                    Furthermore, the Session Info-Tree is extended with
1732                                    a complete representation of the parsed apr-file.
1733                                    </para>
1734                                    <para>
1735                                    The legend of Thuban does not yet cover all of the elements as
1736                                    supported by the legend of ArcView�. Therefore, the Thuban
1737                                    map will look different. Furthermore, the apr-format is
1738                                    a proprietary format, not openly documented.
1739                                    Therefore, the interpretation is
1740                                    partly based on reverse engeneering and good guessing.
1741                                    </para>
1742                                    <para>
1743                                    The file-paths within the apr-file may not fit and potentially
1744                                    are subject to fix in the apr-file. You can do this
1745                                    applying any text editor. The paths are either absolute
1746                                    or relative from where Thuban has been started.
1747                                    </para>
1748                                    <para>
1749                                    A sample for the Iceland data is included as
1750                                    <literal>Extensions/importAPR/samples/iceland.apr</literal>.
1751                                    The file-paths are relative from the Thuban main directory.
1752                                    </para>
1753                            </section>
1754                    </section>
1755            </section>
1756    
1757            <section><title>Writing simple extensions</title>
1758                    <para>
1759                    Writing an extension for Thuban basically means to
1760                    implement the extra functionality in Python with all of the
1761                    Thuban classes, methods and variables available.
1762                    </para>
1763                    <para>
1764                    All classes and their methods are documented in the source code
1765                    (see their doc-strings). Here is an example from
1766                    Thuban/Model/layer.py that describes some of the methods
1767                    of a Layer object:
1768                    </para>
1769                    <programlisting>
1770                    <![CDATA[
1771    class BaseLayer(TitledObject, Modifiable):
1772    
1773        """Base class for the layers."""
1774    
1775        def __init__(self, title, visible = True, projection = None):
1776            """Initialize the layer.
1777    
1778            title -- the title
1779            visible -- boolean. If true the layer is visible.
1780            """
1781            TitledObject.__init__(self, title)
1782            Modifiable.__init__(self)
1783            self.visible = visible
1784            self.projection = projection
1785    
1786        def Visible(self):
1787            """Return true if layer is visible"""
1788            return self.visible
1789    
1790        def SetVisible(self, visible):
1791            """Set the layer's visibility."""
1792            self.visible = visible
1793            self.issue(LAYER_VISIBILITY_CHANGED, self)
1794    
1795        def HasClassification(self):
1796            """Determine if this layer support classifications."""
1797    ...
1798                    ]]>
1799                    </programlisting>
1800                    <para>
1801                    This example intends to give you an impression of the
1802                    source-code-level documentation.
1803                    You have to make yourself familiar with
1804                    the Python programming language to understand some special
1805                    code elements.
1806                    </para>
1807                    <section><title>hello_world.py</title>
1808                      <para>
1809                      Traditionally, the first example should welcome the world.
1810                      Most of the code handles the frame for integrating a menu
1811                      item into Thuban while the actual raising of a message
1812                      is done in a single line.
1813                      </para>
1814                            <programlisting>
1815                            <![CDATA[
1816    # Copyright (C) 2003 by Intevation GmbH
1817    # Authors:
1818    # Jan-Oliver Wagner <[email protected]>
1819    #
1820    # This program is free software under the GPL (>=v2)
1821    # Read the file COPYING coming with Thuban for details.
1822    
1823    """
1824    Extend Thuban with a sample Hello World to demonstrate simple
1825    extensions.
1826    """
1827    
1828    __version__ = '$Revision$'
1829    
1830    # use _() already now for all strings that may later be translated
1831    from Thuban import _
1832    
1833    # Thuban has named commands which can be registered in the central
1834    # instance registry.
1835    from Thuban.UI.command import registry, Command
1836    
1837    # The instance of the main menu of the Thuban application
1838    # See Thuban/UI/menu.py for the API of the Menu class
1839    from Thuban.UI.mainwindow import main_menu
1840    
1841    def hello_world_dialog(context):
1842        """Just raise a simple dialog to greet the world.
1843    
1844        context -- The Thuban context.
1845        """
1846        context.mainwindow.RunMessageBox(_('Hello World'), _('Hello World!'))
1847    
1848    
1849    # create a new command and register it
1850    registry.Add(Command('hello_world', _('Hello World'), hello_world_dialog,
1851                         helptext = _('Welcome everyone on this planet')))
1852    
1853    # find the extensions menu (create it anew if not found)
1854    extensions_menu = main_menu.FindOrInsertMenu('extensions', _('E&xtensions'))
1855    
1856    # finally bind the new command with an entry in the extensions menu
1857    extensions_menu.InsertItem('hello_world')
1858                            ]]>
1859                            </programlisting>
1860                    </section>
1861                    <section><title>Registering a Command</title>
1862                      <para>
1863                      Mainly, our new function has to be registered to the Thuban
1864                      framework in order to connect it to the menu. A registered
1865                      command can also be connected to e.g. a toolbar button.
1866                      </para>
1867                      <para>
1868                      The instances and classes for this are imported at the beginning.
1869                      Any code not inside a method or class is directly executed when
1870                      the source-code module is imported. Therefore, the second
1871                      part of this example consist of the plain statements to create a new
1872                      Command and to add it to the menu.
1873                      </para>
1874                      <para>
1875                      By convention, it looks for a menu registered as ``extensions'' to
1876                      insert the new command. If it does not exist yet, it gets created.
1877                      It is advisable to copy this code for any of your extensions.
1878                      </para>
1879                    </section>
1880                    <section><title>The Thuban context</title>
1881                            <para>
1882                            A registered command that is called, always receives the
1883                            Thuban context. This instance provides our method with
1884                            hook references to all important components of the Thuban
1885                            application.
1886                            </para>
1887                            <para>
1888                    In the example hello_world.py, our function uses the
1889                            mainwindow component which offers a method to raise a
1890                            message dialog. In total there are three hooks:
1891                            <itemizedlist>
1892                            <listitem>
1893                            <para>application:
1894                            This object is the instance of the Thuban Application class.
1895                            Except maybe for loading or savinf sessions, you will not
1896                            need this object for a simple extension.
1897                            See Thuban/UI/application.py for the API.
1898                            </para>
1899                            </listitem>
1900                            <listitem>
1901                            <para>session:
1902                            The instance of the current session. It manages the sessions'
1903                            map and tables. You can set and remove the map or tables.
1904                            In may also get the map object. However, you should know that
1905                            internally it is already prepared to handle many maps.
1906                            Therfore, currently you would always receive a list with exactlty
1907                            one element. In the future, if there are more than one map,
1908                            you will not know which one is the currently display one and
1909                            therefore you should use the mainwindow as hook to find
1910                            the currently displayed map.
1911                            See Thuban/Model/session.py for the API.
1912                            </para>
1913                            </listitem>
1914                            <listitem>
1915                            <para>
1916                            mainwindow: The mainwindow object is central to manage various
1917                            GUI things such as the Legend sub-window. Most notably,
1918                            you get access to the canvas which is the window part where
1919                            the map is drawn. The canvas knows, which map it currently
1920                            draws and therefore you get the current map via
1921                            context.mainwindow.canvas.Map().
1922                            See Thuban/UI/mainwindow.py for the API.
1923                            </para>
1924                            </listitem>
1925                            </itemizedlist>
1926                </para>
1927                    </section>
1928            </section>
1929      </chapter>
1930    
1931    <chapter><title>Trouble Shooting</title>    <chapter><title>Trouble Shooting</title>
1932      <para>      <para>
1933        Here are a few problems that users have encountered when first using Thuban.
1934        </para>
1935        <para>
1936    
1937        <itemizedlist>
1938        <listitem>
1939        <para>After adding two or more layers nothing is drawn in the map window.
1940        </para>
1941        <para>
1942        This is probably because the layers have different projections. Projections
1943        must be set on all layers and on the map itself if the layers' projections
1944        are different.
1945        </para>
1946        </listitem>
1947    
1948        <listitem>
1949        <para>Thuban crashes on startup with the error
1950            <literal>NameError: global name 'False' is not defined</literal>.
1951        </para>
1952        <para>
1953        <varname>True</varname> and <varname>False</varname> were only introduced
1954        in Python 2.2.1. Thuban depends on at least Python 2.2.1.
1955        </para>
1956        </listitem>
1957    
1958        <listitem>
1959        <para>After compiling Thuban, Thuban crashes with an error similar to
1960            <literal>
1961            ImportError: /usr/local//lib/thuban/Thuban/../Lib/wxproj.so: undefined symbol: __gxx_personality_v0
1962            </literal>
1963        </para>
1964        <para>
1965        Thuban depends on the wxWindows library. If Thuban is compiled with an
1966        incompatible version of the compiler than wxWindows was compiled with
1967        this error may occur. Try compiling with a different version of the
1968        compiler.
1969        </para>
1970        </listitem>
1971        </itemizedlist>
1972        </para>
1973        <para>
1974        If an error occurs Thuban will display a dialog indicating the error
1975        before closing. The text should be copied and reported to the
1976        <ulink url="http://thuban.intevation.org/bugtracker.html">
1977        Intevation bugtracker
1978        </ulink>.
1979        More information about the system is available from
1980        <menuchoice><guimenu>Help</guimenu><guimenuitem>About</guimenuitem></menuchoice> box.
1981        This should also be included in the bug report.
1982        <figure>
1983        <title>Error Dialog</title>
1984        <mediaobject>
1985        <imageobject><imagedata fileref="../images/8_int_error.png" format="PNG" scale="&imgscale;"/></imageobject>
1986        <imageobject><imagedata fileref="./images/8_int_error.eps" format="EPS" scale="&imgscale;"/></imageobject>
1987        </mediaobject>
1988        </figure>
1989      </para>      </para>
1990    
1991    </chapter>    </chapter>
1992    
1993    <appendix><title>Supported Data Sources</title>    <appendix><title>Supported Data Sources</title>
# Line 806  Line 1996 
1996      <variablelist>      <variablelist>
1997      <varlistentry>      <varlistentry>
1998      <term>Shapefile</term>      <term>Shapefile</term>
1999      <listitem><para></para></listitem>      <listitem>
2000            <para>
2001            The Shapefile format has become a standard format for saving
2002            geographic vector information. It supports polygons, lines, and
2003            points.
2004            
2005            <ulink url="http://www.esri.com/library/whitepapers/pdfs/shapefile.pdf">
2006            Technical Specification.
2007            </ulink>  
2008            </para>
2009        </listitem>
2010        </varlistentry>
2011    
2012        <varlistentry>
2013        <term>dBase file</term>
2014        <listitem>
2015            <para>
2016            dBase files are used to store the attributes for each layer. This
2017            is closely associated with the Shapefile format. For detailed
2018            specifications on the correct format of a dBase file used with
2019            Thuban please see the Technical Specification for the Shapefile
2020            format above.
2021            </para>
2022        </listitem>
2023        </varlistentry>
2024    
2025        <varlistentry>
2026        <term>PostGIS</term>
2027        <listitem>
2028            <para>
2029            PostGIS adds support for geographic objects to the PostgreSQL
2030            object-relational database. Different layer types (as for Shapefiles)
2031            are supported. <ulink url="http://postgis.refractions.net">PostGIS
2032            Homepage</ulink>
2033            </para>
2034        </listitem>
2035      </varlistentry>      </varlistentry>
2036    
2037      <varlistentry>      <varlistentry>
2038      <term>DB2 file</term>      <term>Raster files</term>
2039      <listitem><para></para></listitem>      <listitem>
2040            <para>
2041            Binding the GDAL library Thuban supports numerous raster file formats,
2042            see <ulink url="http://www.remotesensing.org/gdal/formats_list.html">
2043            GDAL format list</ulink> for details.</para>
2044    
2045            <para>Most commonly used is the <emphasis>TIFF/GeoTIFF</emphasis>
2046            format: Raster maps are provided as TIFF images, with an additional
2047            "world file" storing the geographic reference (usually with an
2048            extension ".tfw").
2049            </para>
2050        </listitem>
2051      </varlistentry>      </varlistentry>
2052    
2053      </variablelist>      </variablelist>
2054    </appendix>    </appendix>
2055    
2056      <appendix><title>Working with PostGIS</title>
2057      <para>
2058      This section focusses on the use of PostGIS in the Thuban framework. For
2059      installation and maintenance of spatial databases we refer to the  
2060      <ulink url="http://postgis.refractions.net">PostGIS Homepage</ulink>.
2061      The Thuban PostGIS support requires the
2062      <ulink url="http://initd.org/software/psycopg">psycopg module</ulink>.
2063      </para>
2064    
2065      <para>
2066            Working with PostGIS Databases is seperated into two steps:
2067            <itemizedlist>
2068            <listitem><para>Opening a Database Connection</para></listitem>
2069            <listitem><para>Loading a Data Layer</para></listitem>
2070            </itemizedlist>
2071      </para>
2072            <section><title>Opening a Database Connection</title>
2073            <para>
2074                    Before a data layer can be loaded from a PostGIS database a
2075                    connection with the database has to be established.
2076                    <menuchoice>
2077                    <guimenu>Session</guimenu>
2078                    <guimenuitem>Database Connections ...</guimenuitem>
2079                    </menuchoice> opens a dialog for database connection
2080                    management. In the dialog new connections can be added
2081                    and existing ones can be removed. Removing a database
2082                    connection is not possible if the map still displays a
2083                    layer provided by this database connection.
2084            </para>
2085        <figure>
2086        <title>Database Management Dialog</title>
2087        <mediaobject>
2088        <imageobject><imagedata fileref="../images/app_postgis_db_management.png" format="PNG" scale="&imgscale;"/></imageobject>
2089        <imageobject><imagedata fileref="./images/app_postgis_db_management.eps" format="EPS" scale="&imgscale;"/></imageobject>
2090        </mediaobject>
2091        </figure>
2092    
2093            <para>
2094                    To add a new database connection to the session a dialog is
2095                    opened to specify the relevant connection data. Enter all
2096                    data relevant for your connection. If the connection fails
2097                    the dialog remains open and provides some hints on the failure.
2098            </para>
2099            <figure>
2100            <title>Add Database Dialog</title>
2101            <mediaobject>
2102            <imageobject><imagedata fileref="../images/app_postgis_db_add.png" format="PNG" scale="&imgscale;"/></imageobject>
2103            <imageobject><imagedata fileref="./images/app_postgis_db_add.eps" format="EPS" scale="&imgscale;"/></imageobject>
2104            </mediaobject>
2105            </figure>
2106            
2107            <para>
2108            It is important to note that information on database connections are
2109            also stored with the session. Passwords are NOT stored. If you load a
2110            session with database connections you are asked to enter these
2111            passwords again where required.
2112            </para>
2113    
2114            </section>
2115    
2116            <section><title>Loading a Data Layer</title>
2117            <para>
2118            Data layers as part of a map are loaded with the
2119            <menuchoice>
2120            <guimenu>Map</guimenu>
2121            <guimenuitem>Add Database Layer ...</guimenuitem>
2122            </menuchoice> menu item. A dialog is raised displaying two choice
2123            lists. In the left list all connected databases are shown.
2124            Highlighting
2125            one of these and issuing a retrieval results in a list of available
2126            layer tables from that database. After selection of a
2127            layer the dialog is closed.
2128            </para>
2129            <figure>
2130            <title>Add Database Dialog</title>
2131            <mediaobject>
2132            <imageobject><imagedata fileref="../images/app_postgis_add_layer.png" format="PNG" scale="&imgscale;"/></imageobject>
2133            <imageobject><imagedata fileref="./images/app_postgis_add_layer.eps" format="EPS" scale="&imgscale;"/></imageobject>
2134            </mediaobject>
2135            </figure>
2136            
2137            </section>
2138    
2139      </appendix>
2140    
2141    <appendix><title>Supported Projections</title>    <appendix><title>Supported Projections</title>
2142      <para>      <para>
2143        The following types of projections are directly support by
2144        Thuban. The specific values for each are provided by the user
2145        to create custom projections. Thuban comes with predefined
2146        projections which are available through the Projections dialog.
2147        </para>
2148        <itemizedlist>
2149        <listitem>
2150            <para>Geographic</para>
2151            <itemizedlist>
2152            <listitem><para><literal>Ellipsoid</literal></para></listitem>
2153            <listitem><para>
2154                    <literal>Source Data</literal>: either Degrees or Radians
2155                    </para></listitem>
2156            </itemizedlist>
2157        </listitem>
2158        <listitem>
2159            <para>Lambert Conic Conformal</para>
2160        <itemizedlist>
2161            <listitem><para><literal>Ellipsoid</literal></para></listitem>
2162            <listitem><para><literal>Latitude of 1st standard parallel</literal></para></listitem>
2163            <listitem><para><literal>Latitude of 2nd standard parallel</literal></para></listitem>
2164            <listitem><para><literal>Central Meridian</literal></para></listitem>
2165            <listitem><para><literal>Latitude of Origin</literal></para></listitem>
2166            <listitem><para><literal>False Easting</literal> (meters)</para></listitem>
2167            <listitem><para><literal>False Northing</literal> (meters)</para></listitem>
2168        </itemizedlist>
2169        </listitem>
2170        <listitem>
2171            <para>Transverse Mercator</para>
2172        <itemizedlist>
2173            <listitem><para><literal>Ellipsoid</literal></para></listitem>
2174            <listitem><para><literal>Latitude</literal>of origin</para></listitem>
2175            <listitem><para><literal>Longitude</literal>at central meridian</para></listitem>
2176            <listitem><para><literal>Scale Factor</literal>at central meridian</para></listitem>
2177            <listitem><para><literal>False Easting</literal> (meters)</para></listitem>
2178            <listitem><para><literal>False Northing</literal> (meters)</para></listitem>
2179        </itemizedlist>
2180        </listitem>
2181        <listitem>
2182            <para>Universal Transverse Mercator</para>
2183        <itemizedlist>
2184            <listitem><para><literal>Ellipsoid</literal></para></listitem>
2185            <listitem><para><literal>Zone</literal>
2186                    (can be guessed appling the Propose button)</para></listitem>
2187            <listitem><para><literal>Southern Hemisphere</literal> flag</para></listitem>
2188        </itemizedlist>
2189        </listitem>
2190        </itemizedlist>
2191        
2192        <para>
2193        Thuban comes with a sample set of map projections for various
2194        European countries. Apart from the basic projection they differ
2195        especially in their parameterization:
2196        </para>
2197        <itemizedlist>
2198        <listitem><para>Belgium Datum 1972 (Lambert Conic Conformal)</para>
2199        </listitem>
2200    
2201        <listitem><para>Gauss-Boaga Zone 1 (Italy, Transverse Mercartor)</para>
2202        </listitem>
2203    
2204        <listitem><para>Gauss-Krueger Zone 2 (Germany, Transverse Mercartor)
2205        </para>
2206        </listitem>
2207    
2208        <listitem><para>Reseau Geodesique Francaise
2209        (France, Lambert Conic Conformal)</para>
2210        </listitem>
2211    
2212        <listitem><para>UK National Grid (United Kingdom, Transverse Mercartor)
2213        </para>
2214        </listitem>
2215        </itemizedlist>
2216    
2217        <para>
2218        Thuban uses the comprehensive PROJ library for projections. PROJ provides
2219        more than the four commonly used projections described above. If needed
2220        Thuban can be easily extended to a new projection covered by PROJ.
2221      </para>      </para>
     <variablelist>  
     <varlistentry>  
     <term>Geographic</term>  
     <listitem><para>Geographic</para></listitem>  
     </varlistentry>  
     <varlistentry>  
     <term>Lambert Conic Conformal</term>  
     <listitem><para>Lambert Conic Conformal</para></listitem>  
     </varlistentry>  
     <varlistentry>  
     <term>Transverse Mercator</term>  
     <listitem><para>Transverse Mercator</para></listitem>  
     </varlistentry>  
     <varlistentry>  
     <term>Universal Transverse Mercator</term>  
     <listitem><para>Universal Transverse Mercator</para></listitem>  
     </varlistentry>  
     </variablelist>  
2222    </appendix>    </appendix>
2223    
2224  </book>  </book>
2225    
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