| 2 |
<!DOCTYPE book |
<!DOCTYPE book |
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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" |
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[<!ENTITY imgscale "70">]> |
[<!ENTITY imgscale "60">]> |
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<!-- $Revision$ --> |
<!-- $Revision$ --> |
| 7 |
<book> |
<book> |
| 8 |
<bookinfo> |
<bookinfo> |
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</author> |
</author> |
| 20 |
</authorgroup> |
</authorgroup> |
| 21 |
<copyright> |
<copyright> |
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<year>2003</year> |
<year>2003, 2004</year> |
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<holder>Intevation GmbH</holder> |
<holder>Intevation GmbH</holder> |
| 24 |
</copyright> |
</copyright> |
| 25 |
<revhistory> |
<revhistory> |
| 26 |
|
<!-- comment this first revision out when releasing a real version --> |
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<revision> |
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<revnumber>CVS version $Id$</revnumber> |
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<date></date> |
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<revremark>Under development.</revremark> |
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</revision> |
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<revision> |
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<revnumber>1.0.0</revnumber> |
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<date>22-Jan-2004</date> |
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<revremark> |
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Corresponds to Thuban 1.0.0. |
| 37 |
|
New: Installation instructions for Win32. |
| 38 |
|
</revremark> |
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</revision> |
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<revision> |
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<revnumber>1.0pre3</revnumber> |
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<date>04-Dec-2003</date> |
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<revremark> |
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Corresponds to Thuban 1.0rc1. |
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New: I18n, right button legend menu, EPSG projectons, |
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|
PostGIS support. |
| 47 |
|
</revremark> |
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</revision> |
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|
<revision> |
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|
<revnumber>1.0pre2</revnumber> |
| 51 |
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<date>29-Aug-2003</date> |
| 52 |
|
<revremark> |
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Corresponds to Thuban development release 0.8.1. |
| 54 |
|
New: chapter on extensions. |
| 55 |
|
</revremark> |
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|
</revision> |
| 57 |
<revision> |
<revision> |
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<revnumber>1.0pre1</revnumber> |
<revnumber>1.0pre1</revnumber> |
| 59 |
<date>08-Aug-2003</date> |
<date>08-Aug-2003</date> |
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<revremark>Corresponds to Thuban development release 0.8.1</revremark> |
<revremark>Corresponds to Thuban development release 0.8.1.</revremark> |
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</revision> |
</revision> |
| 62 |
</revhistory> |
</revhistory> |
| 63 |
|
|
| 66 |
<chapter><title>Introduction</title> |
<chapter><title>Introduction</title> |
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<para> |
<para> |
| 68 |
Thuban is an interactive geographic data viewer. |
Thuban is an interactive geographic data viewer. |
| 69 |
It has been developed because there was 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. |
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</para> |
</para> |
| 75 |
<para> |
<para> |
| 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> |
| 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>. |
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|
</para> |
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<para> |
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|
Required: |
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|
<itemizedlist> |
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|
<listitem><para>Python 2.2.1 |
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|
(<literal>http://www.python.org</literal>) |
| 105 |
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</para></listitem> |
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|
<listitem><para>wxWindows 2.4 |
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(<literal>http://www.wxwindows.org</literal>) |
| 108 |
|
</para></listitem> |
| 109 |
|
<listitem><para>wxPython 2.4 |
| 110 |
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(<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> |
<itemizedlist> |
| 126 |
<listitem><para>Python 2.2.1 (<literal>http://www.python.org</literal>)</para></listitem> |
<listitem><para>GDAL 1.1.8 |
| 127 |
<listitem><para>wxWindows 2.4 (<literal>http://www.wxwindows.org</literal>)</para></listitem> |
(<literal>http://www.remotesensing.org/gdal/</literal>) |
| 128 |
<listitem><para>wxPython 2.4 (<literal>http://www.wxpython.org</literal>)</para></listitem> |
</para></listitem> |
| 129 |
<listitem><para>proj 4.4.5 Projection Library (<literal>http://www.remotesensing.org/proj/</literal>)</para></listitem> |
<listitem><para>psycopg 1.0.8 |
| 130 |
<listitem><para>GDAL 1.1.8 (<literal>http://www.remotesensing.org/gdal/</literal>)</para></listitem> |
(<literal>http://initd.org/software/psycopg</literal>) |
| 131 |
<listitem><para>SQLite 2.8.3 (<literal>http://www.hwaci.com/sw/sqlite/</literal>)</para></listitem> |
</para></listitem> |
|
<listitem><para>PySQLite 0.4.3 (<literal>http://pysqlite.sourceforge.net</literal>)</para></listitem> |
|
| 132 |
</itemizedlist> |
</itemizedlist> |
| 133 |
</para> |
</para> |
| 134 |
<para> |
<para> |
| 135 |
Along with the source codes, the download page also offers |
Along with the source codes, the download page also offers full |
| 136 |
full installation packages for Debian, Windows and RPM-based systems |
installation packages for Debian, Windows and RPM-based systems |
| 137 |
(Mandrake, RedHat, SuSE, etc). |
(Mandrake, RedHat, SuSE, etc). |
| 138 |
</para> |
</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 |
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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 |
<figure> |
<figure> |
| 570 |
|
|
| 571 |
<section><title>Adding and Removing Layers</title> |
<section><title>Adding and Removing Layers</title> |
| 572 |
<para> |
<para> |
| 573 |
There are two types of layers that can be added to a map: shape layers |
There are three types of layers that can be added to a map: |
| 574 |
|
Shape layers, database layers |
| 575 |
and image layers. Shape layers are stored in Shapefile format, a |
and image layers. Shape layers are stored in Shapefile format, a |
| 576 |
standard file format for storing geographic objects. These |
widely used file format for storing geographic objects. These |
| 577 |
files have the extension ``.shp''. Associated with |
files have the extension ``.shp''. Associated with |
| 578 |
the shape file is a database file which stores attributes for |
the shape file is a database file which stores attributes for |
| 579 |
each shape in the shape file. This file, in dBase format, |
each shape in the Shape file. This file, in dBase format, |
| 580 |
has the extension ``.dbf''. Both files must have the same base name. |
has the extension ``.dbf''. Both files must have the same base name. |
| 581 |
For example, if there is a shape file named roads.shp there must |
For example, if there is a shape file named roads.shp there must |
| 582 |
also be a file roads.dbf. |
also be a file roads.dbf. |
| 583 |
</para> |
</para> |
| 584 |
<para> |
<itemizedlist> |
| 585 |
|
<listitem> |
| 586 |
|
<para> |
| 587 |
Shape layers can be added to the map with |
Shape layers can be added to the map with |
| 588 |
<menuchoice> |
<menuchoice> |
| 589 |
<guimenu>Map</guimenu> |
<guimenu>Map</guimenu> |
| 590 |
<guimenuitem>Add Layer</guimenuitem> |
<guimenuitem>Add Layer</guimenuitem> |
| 591 |
</menuchoice>. |
</menuchoice>. |
| 592 |
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 |
| 593 |
matter if the shape file or database file is selected. |
selection. However, if you switch to display all files and select one |
| 594 |
|
of the associated files (e.g. ``.dbf''), Thuban will recognize the base |
| 595 |
|
name and load the corresponding Shape file. |
| 596 |
</para> |
</para> |
| 597 |
|
<para> |
| 598 |
|
The file dialog for Shape files allows to select multiple files. |
| 599 |
|
Use the shift-button together with the left mouse button to extend |
| 600 |
|
the selection. |
| 601 |
|
</para> |
| 602 |
|
</listitem> |
| 603 |
|
|
| 604 |
|
<listitem> |
| 605 |
|
<para>Database layers can be added to the map with |
| 606 |
|
<menuchoice> |
| 607 |
|
<guimenu>Map</guimenu> |
| 608 |
|
<guimenuitem>Add Database Layer</guimenuitem> |
| 609 |
|
</menuchoice>. |
| 610 |
|
A dialog with two is list is opened. The left list displays all |
| 611 |
|
database connections currently open for the session. You can retrieve |
| 612 |
|
a list of available layers from the selected database which is |
| 613 |
|
displayed on the right hand. From this list one layer can be selected, |
| 614 |
|
the dialog is closed afterwards. |
| 615 |
|
</para> |
| 616 |
|
<para> |
| 617 |
|
See appendix ``Working with PostGIS'' for details. |
| 618 |
|
</para> |
| 619 |
|
</listitem> |
| 620 |
|
|
| 621 |
|
<listitem> |
| 622 |
<para> |
<para> |
| 623 |
Image layers can be added to the map with |
Image layers can be added to the map with |
| 624 |
<menuchoice> |
<menuchoice> |
| 630 |
or in another file. If geographic information cannot be found, Thuban |
or in another file. If geographic information cannot be found, Thuban |
| 631 |
will report an error. |
will report an error. |
| 632 |
</para> |
</para> |
| 633 |
|
</listitem> |
| 634 |
|
</itemizedlist> |
| 635 |
</section> |
</section> |
| 636 |
|
|
| 637 |
<section><title>Navigation</title> |
<section><title>Navigation</title> |
| 923 |
</para> |
</para> |
| 924 |
</listitem> |
</listitem> |
| 925 |
</itemizedlist> |
</itemizedlist> |
| 926 |
|
|
| 927 |
|
<para> |
| 928 |
|
The most used layer related actions are also available from a |
| 929 |
|
popup menu. It is raised when a layer is clicked with the right mouse |
| 930 |
|
button. |
| 931 |
|
</para> |
| 932 |
|
|
| 933 |
|
<para> |
| 934 |
|
<figure> |
| 935 |
|
<title>Layer Popup Menu</title> |
| 936 |
|
<mediaobject> |
| 937 |
|
<imageobject><imagedata fileref="../images/3_5_popup_menu.png" format="PNG" scale="&imgscale;"/></imageobject> |
| 938 |
|
<imageobject><imagedata fileref="./images/3_5_popup_menu.eps" format="EPS" scale="&imgscale;"/></imageobject> |
| 939 |
|
</mediaobject> |
| 940 |
|
</figure> |
| 941 |
|
</para> |
| 942 |
|
|
| 943 |
<para> |
<para> |
| 944 |
Along the bottom of the legend is the scalebar. The scalebar |
Along the bottom of the legend is the scalebar. The scalebar |
| 945 |
will be available if there are any layers and the map has a |
will be available if there are any layers and the map has a |
| 984 |
|
|
| 985 |
<section><title>Types of Layers</title> |
<section><title>Types of Layers</title> |
| 986 |
<para> |
<para> |
| 987 |
There are two types of layers supported by Thuban: shape layers and |
There are three types of layers supported by Thuban: shape layers, |
| 988 |
|
database layers and |
| 989 |
image layers. Shape layers consist of vector based shapes with |
image layers. Shape layers consist of vector based shapes with |
| 990 |
geo-referenced coordinates. There are three types of supported |
geo-referenced coordinates. There are three types of supported |
| 991 |
shapes: polygons, lines (arc), and points. Image layers can be any image |
shapes: polygons, lines (arc), and points. Database layers are similar |
| 992 |
|
to shape layers but loaded from a database instead of the file system. |
| 993 |
|
Image layers can be any image |
| 994 |
file format supported by the Geo-spatial Data Abstraction Library |
file format supported by the Geo-spatial Data Abstraction Library |
| 995 |
(GDAL). The images must have geographic |
(GDAL). The images must have geographic |
| 996 |
coordinate data either embedded within the file or in a separate |
coordinate data either embedded within the file or in a separate |
| 1322 |
</figure> |
</figure> |
| 1323 |
</para> |
</para> |
| 1324 |
<para> |
<para> |
| 1325 |
Thuban is distributed with a sample collection of projections. The |
Thuban is distributed with a sample collection of projections and the |
| 1326 |
|
set of coordinate systems as used by the EPSG |
| 1327 |
|
(European Petroleum Survey Group). This quite large set is only displayed |
| 1328 |
|
if activated by the according checkbox. The set falls into two parts: |
| 1329 |
|
deprecated lists all projections which are no longer part of the |
| 1330 |
|
EPSG data base. |
| 1331 |
|
</para> |
| 1332 |
|
<para> |
| 1333 |
|
The |
| 1334 |
user can create new projections and make them available to all |
user can create new projections and make them available to all |
| 1335 |
future Thuban sessions. They may also be exported and imported so |
future Thuban sessions. They may also be exported and imported so |
| 1336 |
that custom projections can be distributed. |
that custom projections can be distributed. |
| 1610 |
</section> |
</section> |
| 1611 |
</chapter> |
</chapter> |
| 1612 |
|
|
| 1613 |
|
<chapter><title>Extensions</title> |
| 1614 |
|
<para> |
| 1615 |
|
Thuban is designed to be extensible. The term Extension is used as a |
| 1616 |
|
general term for anything that extends Thuban. |
| 1617 |
|
This chapter introduces into some oppportunities how to add and |
| 1618 |
|
handle extra functionality developed by your own or third parties. |
| 1619 |
|
</para> |
| 1620 |
|
|
| 1621 |
|
<section><title>Add personal extensions via thubanstart.py</title> |
| 1622 |
|
<para> |
| 1623 |
|
After Thuban has been started for the first time, a directory |
| 1624 |
|
.thuban is created within your home directory. |
| 1625 |
|
There you can add a file thubanstart.py which will be imported |
| 1626 |
|
by Thuban at start-up. It is recommended to add only import-statements |
| 1627 |
|
to this file to keep the actual code of extensions separate. |
| 1628 |
|
</para> |
| 1629 |
|
<para> |
| 1630 |
|
The modules to import must either be found through the environment |
| 1631 |
|
variable PYTHONPATH or directly be placed into the .thuban-directory. |
| 1632 |
|
</para> |
| 1633 |
|
<para> |
| 1634 |
|
As an example, copy the file examples/simple_extensions/hello_world.py |
| 1635 |
|
of the Thuban source code into the .thuban-directory of your home |
| 1636 |
|
directory. Now add add the statement import hello_world to the |
| 1637 |
|
file thubanstart.py and run Thuban. You will notice an additional |
| 1638 |
|
menu <menuchoice><guimenu>Extensions</guimenu></menuchoice> where |
| 1639 |
|
the new item for the Hello-World extension is placed - select it |
| 1640 |
|
to see the Hello-World message. |
| 1641 |
|
</para> |
| 1642 |
|
</section> |
| 1643 |
|
|
| 1644 |
|
<section><title>Extensions included in Thuban package</title> |
| 1645 |
|
<para> |
| 1646 |
|
The extensions described in this section are part of the |
| 1647 |
|
Thuban package, but not activated by default. |
| 1648 |
|
You will find them in the Thuban installation directory |
| 1649 |
|
under <literal>Extensions/</literal>. Activate them as personal |
| 1650 |
|
extensions via PYTHONPATH as described in the previous section. |
| 1651 |
|
Stable extensions will appear under the menu |
| 1652 |
|
<menuchoice><guimenu>Extensions</guimenu></menuchoice> and |
| 1653 |
|
extensions which are in experimental state and therefore |
| 1654 |
|
not fully functional under |
| 1655 |
|
<menuchoice><guimenu>Experimental</guimenu></menuchoice>. |
| 1656 |
|
</para> |
| 1657 |
|
|
| 1658 |
|
<section><title>Stable extensions</title> |
| 1659 |
|
<para> |
| 1660 |
|
These extensions provide extra-functionality to Thuban |
| 1661 |
|
that has not (yet) been integrated in the main application. |
| 1662 |
|
They are considered to be free of bugs, but may be |
| 1663 |
|
further polished with helpful user interactions. |
| 1664 |
|
</para> |
| 1665 |
|
<section><title>gns2shp</title> |
| 1666 |
|
<para> |
| 1667 |
|
This tool converts data of the Geospatial Names Server |
| 1668 |
|
(GNS, see <ulink url="http://www.nima.mil/gns"/>) |
| 1669 |
|
into Shapefile format. |
| 1670 |
|
The above web-site offer to download named places |
| 1671 |
|
information grouped by countries for all of the world |
| 1672 |
|
except USA for which other data are provided. |
| 1673 |
|
</para> |
| 1674 |
|
<para> |
| 1675 |
|
If you download and unpack a package, you will have |
| 1676 |
|
a text-file with suffix .txt. |
| 1677 |
|
Selecting such a file via gns2shp will create the |
| 1678 |
|
corresponding Shapefile with the same basename and |
| 1679 |
|
place it in the same direcory. Afterwards it |
| 1680 |
|
is automatically loaded into Thuban. |
| 1681 |
|
The Shapefile will not automatically be delete afterwards. |
| 1682 |
|
</para> |
| 1683 |
|
<para> |
| 1684 |
|
The gns2shp.py module can also be executed on the |
| 1685 |
|
command line for batch processing purposes. |
| 1686 |
|
</para> |
| 1687 |
|
<para> |
| 1688 |
|
A sample (<literal>ls.txt</literal> for Liechtenstein) |
| 1689 |
|
is included in the directory |
| 1690 |
|
<literal>Extensions/gns2shp/test</literal>. |
| 1691 |
|
</para> |
| 1692 |
|
</section> |
| 1693 |
|
</section> |
| 1694 |
|
<section><title>Experimental extensions</title> |
| 1695 |
|
<para> |
| 1696 |
|
All all of these functions have to be handled with care, |
| 1697 |
|
since they are neither complete nor well tested. |
| 1698 |
|
They are to be seen as a proof-of-concept and may |
| 1699 |
|
additionally in some cases of practical help. |
| 1700 |
|
</para> |
| 1701 |
|
<para> |
| 1702 |
|
Any interest on further improvement of these extensions |
| 1703 |
|
should be communicated towards the developer and user |
| 1704 |
|
community. |
| 1705 |
|
</para> |
| 1706 |
|
|
| 1707 |
|
<section><title>importAPR</title> |
| 1708 |
|
<para> |
| 1709 |
|
This command offer to load an ESRI� ArcView� project |
| 1710 |
|
file (suffix .apr) and convert it for use within Thuban. |
| 1711 |
|
After selecting a apr-file to load, a list |
| 1712 |
|
will be presented that offers to select one of the views |
| 1713 |
|
of the apr-file, provided there is more than one. |
| 1714 |
|
Furthermore, the Session Info-Tree is extended with |
| 1715 |
|
a complete representation of the parsed apr-file. |
| 1716 |
|
</para> |
| 1717 |
|
<para> |
| 1718 |
|
The legend of Thuban does not yet cover all of the elements as |
| 1719 |
|
supported by the legend of ArcView�. Therefore, the Thuban |
| 1720 |
|
map will look different. Furthermore, the apr-format is |
| 1721 |
|
a proprietary format, not openly documented. |
| 1722 |
|
Therefore, the interpretation is |
| 1723 |
|
partly based on reverse engeneering and good guessing. |
| 1724 |
|
</para> |
| 1725 |
|
<para> |
| 1726 |
|
The file-paths within the apr-file may not fit and potentially |
| 1727 |
|
are subject to fix in the apr-file. You can do this |
| 1728 |
|
applying any text editor. The paths are either absolute |
| 1729 |
|
or relative from where Thuban has been started. |
| 1730 |
|
</para> |
| 1731 |
|
<para> |
| 1732 |
|
A sample for the Iceland data is included as |
| 1733 |
|
<literal>Extensions/importAPR/samples/iceland.apr</literal>. |
| 1734 |
|
The file-paths are relative from the Thuban main directory. |
| 1735 |
|
</para> |
| 1736 |
|
</section> |
| 1737 |
|
</section> |
| 1738 |
|
</section> |
| 1739 |
|
|
| 1740 |
|
<section><title>Writing simple extensions</title> |
| 1741 |
|
<para> |
| 1742 |
|
Writing an extension for Thuban basically means to |
| 1743 |
|
implement the extra functionality in Python with all of the |
| 1744 |
|
Thuban classes, methods and variables available. |
| 1745 |
|
</para> |
| 1746 |
|
<para> |
| 1747 |
|
All classes and their methods are documented in the source code |
| 1748 |
|
(see their doc-strings). Here is an example from |
| 1749 |
|
Thuban/Model/layer.py that describes some of the methods |
| 1750 |
|
of a Layer object: |
| 1751 |
|
</para> |
| 1752 |
|
<programlisting> |
| 1753 |
|
<![CDATA[ |
| 1754 |
|
class BaseLayer(TitledObject, Modifiable): |
| 1755 |
|
|
| 1756 |
|
"""Base class for the layers.""" |
| 1757 |
|
|
| 1758 |
|
def __init__(self, title, visible = True, projection = None): |
| 1759 |
|
"""Initialize the layer. |
| 1760 |
|
|
| 1761 |
|
title -- the title |
| 1762 |
|
visible -- boolean. If true the layer is visible. |
| 1763 |
|
""" |
| 1764 |
|
TitledObject.__init__(self, title) |
| 1765 |
|
Modifiable.__init__(self) |
| 1766 |
|
self.visible = visible |
| 1767 |
|
self.projection = projection |
| 1768 |
|
|
| 1769 |
|
def Visible(self): |
| 1770 |
|
"""Return true if layer is visible""" |
| 1771 |
|
return self.visible |
| 1772 |
|
|
| 1773 |
|
def SetVisible(self, visible): |
| 1774 |
|
"""Set the layer's visibility.""" |
| 1775 |
|
self.visible = visible |
| 1776 |
|
self.issue(LAYER_VISIBILITY_CHANGED, self) |
| 1777 |
|
|
| 1778 |
|
def HasClassification(self): |
| 1779 |
|
"""Determine if this layer support classifications.""" |
| 1780 |
|
... |
| 1781 |
|
]]> |
| 1782 |
|
</programlisting> |
| 1783 |
|
<para> |
| 1784 |
|
This example intends to give you an impression of the |
| 1785 |
|
source-code-level documentation. |
| 1786 |
|
You have to make yourself familiar with |
| 1787 |
|
the Python programming language to understand some special |
| 1788 |
|
code elements. |
| 1789 |
|
</para> |
| 1790 |
|
<section><title>hello_world.py</title> |
| 1791 |
|
<para> |
| 1792 |
|
Traditionally, the first example should welcome the world. |
| 1793 |
|
Most of the code handles the frame for integrating a menu |
| 1794 |
|
item into Thuban while the actual raising of a message |
| 1795 |
|
is done in a single line. |
| 1796 |
|
</para> |
| 1797 |
|
<programlisting> |
| 1798 |
|
<![CDATA[ |
| 1799 |
|
# Copyright (C) 2003 by Intevation GmbH |
| 1800 |
|
# Authors: |
| 1801 |
|
# Jan-Oliver Wagner <[email protected]> |
| 1802 |
|
# |
| 1803 |
|
# This program is free software under the GPL (>=v2) |
| 1804 |
|
# Read the file COPYING coming with Thuban for details. |
| 1805 |
|
|
| 1806 |
|
""" |
| 1807 |
|
Extend Thuban with a sample Hello World to demonstrate simple |
| 1808 |
|
extensions. |
| 1809 |
|
""" |
| 1810 |
|
|
| 1811 |
|
__version__ = '$Revision$' |
| 1812 |
|
|
| 1813 |
|
# use _() already now for all strings that may later be translated |
| 1814 |
|
from Thuban import _ |
| 1815 |
|
|
| 1816 |
|
# Thuban has named commands which can be registered in the central |
| 1817 |
|
# instance registry. |
| 1818 |
|
from Thuban.UI.command import registry, Command |
| 1819 |
|
|
| 1820 |
|
# The instance of the main menu of the Thuban application |
| 1821 |
|
# See Thuban/UI/menu.py for the API of the Menu class |
| 1822 |
|
from Thuban.UI.mainwindow import main_menu |
| 1823 |
|
|
| 1824 |
|
def hello_world_dialog(context): |
| 1825 |
|
"""Just raise a simple dialog to greet the world. |
| 1826 |
|
|
| 1827 |
|
context -- The Thuban context. |
| 1828 |
|
""" |
| 1829 |
|
context.mainwindow.RunMessageBox(_('Hello World'), _('Hello World!')) |
| 1830 |
|
|
| 1831 |
|
|
| 1832 |
|
# create a new command and register it |
| 1833 |
|
registry.Add(Command('hello_world', _('Hello World'), hello_world_dialog, |
| 1834 |
|
helptext = _('Welcome everyone on this planet'))) |
| 1835 |
|
|
| 1836 |
|
# find the extensions menu (create it anew if not found) |
| 1837 |
|
extensions_menu = main_menu.FindOrInsertMenu('extensions', _('E&xtensions')) |
| 1838 |
|
|
| 1839 |
|
# finally bind the new command with an entry in the extensions menu |
| 1840 |
|
extensions_menu.InsertItem('hello_world') |
| 1841 |
|
]]> |
| 1842 |
|
</programlisting> |
| 1843 |
|
</section> |
| 1844 |
|
<section><title>Registering a Command</title> |
| 1845 |
|
<para> |
| 1846 |
|
Mainly, our new function has to be registered to the Thuban |
| 1847 |
|
framework in order to connect it to the menu. A registered |
| 1848 |
|
command can also be connected to e.g. a toolbar button. |
| 1849 |
|
</para> |
| 1850 |
|
<para> |
| 1851 |
|
The instances and classes for this are imported at the beginning. |
| 1852 |
|
Any code not inside a method or class is directly executed when |
| 1853 |
|
the source-code module is imported. Therefore, the second |
| 1854 |
|
part of this example consist of the plain statements to create a new |
| 1855 |
|
Command and to add it to the menu. |
| 1856 |
|
</para> |
| 1857 |
|
<para> |
| 1858 |
|
By convention, it looks for a menu registered as ``extensions'' to |
| 1859 |
|
insert the new command. If it does not exist yet, it gets created. |
| 1860 |
|
It is advisable to copy this code for any of your extensions. |
| 1861 |
|
</para> |
| 1862 |
|
</section> |
| 1863 |
|
<section><title>The Thuban context</title> |
| 1864 |
|
<para> |
| 1865 |
|
A registered command that is called, always receives the |
| 1866 |
|
Thuban context. This instance provides our method with |
| 1867 |
|
hook references to all important components of the Thuban |
| 1868 |
|
application. |
| 1869 |
|
</para> |
| 1870 |
|
<para> |
| 1871 |
|
In the example hello_world.py, our function uses the |
| 1872 |
|
mainwindow component which offers a method to raise a |
| 1873 |
|
message dialog. In total there are three hooks: |
| 1874 |
|
<itemizedlist> |
| 1875 |
|
<listitem> |
| 1876 |
|
<para>application: |
| 1877 |
|
This object is the instance of the Thuban Application class. |
| 1878 |
|
Except maybe for loading or savinf sessions, you will not |
| 1879 |
|
need this object for a simple extension. |
| 1880 |
|
See Thuban/UI/application.py for the API. |
| 1881 |
|
</para> |
| 1882 |
|
</listitem> |
| 1883 |
|
<listitem> |
| 1884 |
|
<para>session: |
| 1885 |
|
The instance of the current session. It manages the sessions' |
| 1886 |
|
map and tables. You can set and remove the map or tables. |
| 1887 |
|
In may also get the map object. However, you should know that |
| 1888 |
|
internally it is already prepared to handle many maps. |
| 1889 |
|
Therfore, currently you would always receive a list with exactlty |
| 1890 |
|
one element. In the future, if there are more than one map, |
| 1891 |
|
you will not know which one is the currently display one and |
| 1892 |
|
therefore you should use the mainwindow as hook to find |
| 1893 |
|
the currently displayed map. |
| 1894 |
|
See Thuban/Model/session.py for the API. |
| 1895 |
|
</para> |
| 1896 |
|
</listitem> |
| 1897 |
|
<listitem> |
| 1898 |
|
<para> |
| 1899 |
|
mainwindow: The mainwindow object is central to manage various |
| 1900 |
|
GUI things such as the Legend sub-window. Most notably, |
| 1901 |
|
you get access to the canvas which is the window part where |
| 1902 |
|
the map is drawn. The canvas knows, which map it currently |
| 1903 |
|
draws and therefore you get the current map via |
| 1904 |
|
context.mainwindow.canvas.Map(). |
| 1905 |
|
See Thuban/UI/mainwindow.py for the API. |
| 1906 |
|
</para> |
| 1907 |
|
</listitem> |
| 1908 |
|
</itemizedlist> |
| 1909 |
|
</para> |
| 1910 |
|
</section> |
| 1911 |
|
</section> |
| 1912 |
|
</chapter> |
| 1913 |
|
|
| 1914 |
<chapter><title>Trouble Shooting</title> |
<chapter><title>Trouble Shooting</title> |
| 1915 |
<para> |
<para> |
| 1916 |
Here are a few problems that users have encountered when first using Thuban. |
Here are a few problems that users have encountered when first using Thuban. |
| 2006 |
</varlistentry> |
</varlistentry> |
| 2007 |
|
|
| 2008 |
<varlistentry> |
<varlistentry> |
| 2009 |
|
<term>PostGIS</term> |
| 2010 |
|
<listitem> |
| 2011 |
|
<para> |
| 2012 |
|
PostGIS adds support for geographic objects to the PostgreSQL |
| 2013 |
|
object-relational database. Different layer types (as for Shapefiles) |
| 2014 |
|
are supported. <ulink url="http://postgis.refractions.net">PostGIS |
| 2015 |
|
Homepage</ulink> |
| 2016 |
|
</para> |
| 2017 |
|
</listitem> |
| 2018 |
|
</varlistentry> |
| 2019 |
|
|
| 2020 |
|
<varlistentry> |
| 2021 |
<term>Raster files</term> |
<term>Raster files</term> |
| 2022 |
<listitem> |
<listitem> |
| 2023 |
<para> |
<para> |
| 2036 |
</variablelist> |
</variablelist> |
| 2037 |
</appendix> |
</appendix> |
| 2038 |
|
|
| 2039 |
|
<appendix><title>Working with PostGIS</title> |
| 2040 |
|
<para> |
| 2041 |
|
This section focusses on the use of PostGIS in the Thuban framework. For |
| 2042 |
|
installation and maintenance of spatial databases we refer to the |
| 2043 |
|
<ulink url="http://postgis.refractions.net">PostGIS Homepage</ulink>. |
| 2044 |
|
The Thuban PostGIS support requires the |
| 2045 |
|
<ulink url="http://initd.org/software/psycopg">psycopg module</ulink>. |
| 2046 |
|
</para> |
| 2047 |
|
|
| 2048 |
|
<para> |
| 2049 |
|
Working with PostGIS Databases is seperated into two steps: |
| 2050 |
|
<itemizedlist> |
| 2051 |
|
<listitem><para>Opening a Database Connection</para></listitem> |
| 2052 |
|
<listitem><para>Loading a Data Layer</para></listitem> |
| 2053 |
|
</itemizedlist> |
| 2054 |
|
</para> |
| 2055 |
|
<section><title>Opening a Database Connection</title> |
| 2056 |
|
<para> |
| 2057 |
|
Before a data layer can be loaded from a PostGIS database a |
| 2058 |
|
connection with the database has to be established. |
| 2059 |
|
<menuchoice> |
| 2060 |
|
<guimenu>Session</guimenu> |
| 2061 |
|
<guimenuitem>Database Connections ...</guimenuitem> |
| 2062 |
|
</menuchoice> opens a dialog for database connection |
| 2063 |
|
management. In the dialog new connections can be added |
| 2064 |
|
and existing ones can be removed. Removing a database |
| 2065 |
|
connection is not possible if the map still displays a |
| 2066 |
|
layer provided by this database connection. |
| 2067 |
|
</para> |
| 2068 |
|
<figure> |
| 2069 |
|
<title>Database Management Dialog</title> |
| 2070 |
|
<mediaobject> |
| 2071 |
|
<imageobject><imagedata fileref="../images/app_postgis_db_management.png" format="PNG" scale="&imgscale;"/></imageobject> |
| 2072 |
|
<imageobject><imagedata fileref="./images/app_postgis_db_management.eps" format="EPS" scale="&imgscale;"/></imageobject> |
| 2073 |
|
</mediaobject> |
| 2074 |
|
</figure> |
| 2075 |
|
|
| 2076 |
|
<para> |
| 2077 |
|
To add a new database connection to the session a dialog is |
| 2078 |
|
opened to specify the relevant connection data. Enter all |
| 2079 |
|
data relevant for your connection. If the connection fails |
| 2080 |
|
the dialog remains open and provides some hints on the failure. |
| 2081 |
|
</para> |
| 2082 |
|
<figure> |
| 2083 |
|
<title>Add Database Dialog</title> |
| 2084 |
|
<mediaobject> |
| 2085 |
|
<imageobject><imagedata fileref="../images/app_postgis_db_add.png" format="PNG" scale="&imgscale;"/></imageobject> |
| 2086 |
|
<imageobject><imagedata fileref="./images/app_postgis_db_add.eps" format="EPS" scale="&imgscale;"/></imageobject> |
| 2087 |
|
</mediaobject> |
| 2088 |
|
</figure> |
| 2089 |
|
|
| 2090 |
|
<para> |
| 2091 |
|
It is important to note that information on database connections are |
| 2092 |
|
also stored with the session. Passwords are NOT stored. If you load a |
| 2093 |
|
session with database connections you are asked to enter these |
| 2094 |
|
passwords again where required. |
| 2095 |
|
</para> |
| 2096 |
|
|
| 2097 |
|
</section> |
| 2098 |
|
|
| 2099 |
|
<section><title>Loading a Data Layer</title> |
| 2100 |
|
<para> |
| 2101 |
|
Data layers as part of a map are loaded with the |
| 2102 |
|
<menuchoice> |
| 2103 |
|
<guimenu>Map</guimenu> |
| 2104 |
|
<guimenuitem>Add Database Layer ...</guimenuitem> |
| 2105 |
|
</menuchoice> menu item. A dialog is raised displaying two choice |
| 2106 |
|
lists. In the left list all connected databases are shown. |
| 2107 |
|
Highlighting |
| 2108 |
|
one of these and issuing a retrieval results in a list of available |
| 2109 |
|
layer tables from that database. After selection of a |
| 2110 |
|
layer the dialog is closed. |
| 2111 |
|
</para> |
| 2112 |
|
<figure> |
| 2113 |
|
<title>Add Database Dialog</title> |
| 2114 |
|
<mediaobject> |
| 2115 |
|
<imageobject><imagedata fileref="../images/app_postgis_add_layer.png" format="PNG" scale="&imgscale;"/></imageobject> |
| 2116 |
|
<imageobject><imagedata fileref="./images/app_postgis_add_layer.eps" format="EPS" scale="&imgscale;"/></imageobject> |
| 2117 |
|
</mediaobject> |
| 2118 |
|
</figure> |
| 2119 |
|
|
| 2120 |
|
</section> |
| 2121 |
|
|
| 2122 |
|
</appendix> |
| 2123 |
|
|
| 2124 |
<appendix><title>Supported Projections</title> |
<appendix><title>Supported Projections</title> |
| 2125 |
<para> |
<para> |
| 2126 |
The following types of projections are directly support by |
The following types of projections are directly support by |
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