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revision 1466 by jonathan, Tue Jul 22 14:02:39 2003 UTC revision 1473 by jonathan, Thu Jul 24 09:05:11 2003 UTC
# Line 207  Line 207 
207          <inlinemediaobject>          <inlinemediaobject>
208          <imageobject>          <imageobject>
209          <imagedata fileref="../images/3_2_zoomin.png" format="PNG"/>          <imagedata fileref="../images/3_2_zoomin.png" format="PNG"/>
210            </imageobject>
211            <imageobject>
212            <imagedata fileref="./images/3_2_zoomin.eps" format="EPS"/>
213          </imageobject>          </imageobject>
214          <textobject> <phrase>ZoomIn Tool</phrase> </textobject>          <textobject> <phrase>ZoomIn Tool</phrase> </textobject>
215          </inlinemediaobject>          </inlinemediaobject>
# Line 220  Line 223 
223          <inlinemediaobject>          <inlinemediaobject>
224          <imageobject>          <imageobject>
225          <imagedata fileref="../images/3_2_zoomout.png" format="PNG"/>          <imagedata fileref="../images/3_2_zoomout.png" format="PNG"/>
226            </imageobject>
227            <imageobject>
228            <imagedata fileref="./images/3_2_zoomout.eps" format="EPS"/>
229          </imageobject>          </imageobject>
230          <textobject> <phrase>ZoomOut Tool</phrase> </textobject>          <textobject> <phrase>ZoomOut Tool</phrase> </textobject>
231          </inlinemediaobject>          </inlinemediaobject>
# Line 233  Line 239 
239          <inlinemediaobject>          <inlinemediaobject>
240          <imageobject>          <imageobject>
241          <imagedata fileref="../images/3_2_pan.png" format="PNG"/>          <imagedata fileref="../images/3_2_pan.png" format="PNG"/>
242            </imageobject>
243            <imageobject>
244            <imagedata fileref="./images/3_2_pan.eps" format="EPS"/>
245          </imageobject>          </imageobject>
246          <textobject> <phrase>Pan Tool</phrase> </textobject>          <textobject> <phrase>Pan Tool</phrase> </textobject>
247          </inlinemediaobject>          </inlinemediaobject>
# Line 243  Line 252 
252          <inlinemediaobject>          <inlinemediaobject>
253          <imageobject>          <imageobject>
254          <imagedata fileref="../images/3_2_fullextent.png" format="PNG"/>          <imagedata fileref="../images/3_2_fullextent.png" format="PNG"/>
255            </imageobject>
256            <imageobject>
257            <imagedata fileref="./images/3_2_fullextent.eps" format="EPS"/>
258          </imageobject>          </imageobject>
259          <textobject> <phrase>Full Extent Tool</phrase> </textobject>          <textobject> <phrase>Full Extent Tool</phrase> </textobject>
260          </inlinemediaobject>          </inlinemediaobject>
# Line 253  Line 265 
265          <inlinemediaobject>          <inlinemediaobject>
266          <imageobject>          <imageobject>
267          <imagedata fileref="../images/3_2_fulllayerextent.png" format="PNG"/>          <imagedata fileref="../images/3_2_fulllayerextent.png" format="PNG"/>
268            </imageobject>
269            <imageobject>
270            <imagedata fileref="./images/3_2_fulllayerextent.eps" format="EPS"/>
271          </imageobject>          </imageobject>
272          <textobject> <phrase>Full Layer Extent Tool</phrase> </textobject>          <textobject> <phrase>Full Layer Extent Tool</phrase> </textobject>
273          </inlinemediaobject>          </inlinemediaobject>
# Line 265  Line 280 
280          <inlinemediaobject>          <inlinemediaobject>
281          <imageobject>          <imageobject>
282          <imagedata fileref="../images/3_2_fullshapeextent.png" format="PNG"/>          <imagedata fileref="../images/3_2_fullshapeextent.png" format="PNG"/>
283            </imageobject>
284            <imageobject>
285            <imagedata fileref="./images/3_2_fullshapeextent.eps" format="EPS"/>
286          </imageobject>          </imageobject>
287          <textobject> <phrase>Full Shape Extent Tool</phrase> </textobject>          <textobject> <phrase>Full Shape Extent Tool</phrase> </textobject>
288          </inlinemediaobject>          </inlinemediaobject>
# Line 281  Line 299 
299          <inlinemediaobject>          <inlinemediaobject>
300          <imageobject>          <imageobject>
301          <imagedata fileref="../images/3_3_identify.png" format="PNG"/>          <imagedata fileref="../images/3_3_identify.png" format="PNG"/>
302            </imageobject>
303            <imageobject>
304            <imagedata fileref="./images/3_3_identify.eps" format="EPS"/>
305          </imageobject>          </imageobject>
306          <textobject> <phrase>Identify Tool</phrase> </textobject>          <textobject> <phrase>Identify Tool</phrase> </textobject>
307          </inlinemediaobject>.          </inlinemediaobject>.
# Line 296  Line 317 
317          <inlinemediaobject>          <inlinemediaobject>
318          <imageobject>          <imageobject>
319          <imagedata fileref="../images/3_3_label.png" format="PNG"/>          <imagedata fileref="../images/3_3_label.png" format="PNG"/>
320            </imageobject>
321            <imageobject>
322            <imagedata fileref="./images/3_3_label.eps" format="EPS"/>
323          </imageobject>          </imageobject>
324          <textobject> <phrase>Label Tool</phrase> </textobject>          <textobject> <phrase>Label Tool</phrase> </textobject>
325          </inlinemediaobject>.          </inlinemediaobject>.
# Line 348  Line 372 
372          image layers. Shape layers consist of vector based shapes with          image layers. Shape layers consist of vector based shapes with
373          geo-referenced coordinates. There are three types of supported          geo-referenced coordinates. There are three types of supported
374          shapes: polygons, lines, and points. Image layers can be any image          shapes: polygons, lines, and points. Image layers can be any image
375          file format supported by GDAL. The images must have a geographic          file format supported by GDAL. The images must have geographic
376          coordinate data either embedded within the file, or in a seperate          coordinate data either embedded within the file, or in a seperate
377          file that is in the same directory as the image file used for the          file that is in the same directory as the image file. GeoTIFF files
378          layer. GeoTIFF files work very well with Thuban and were designed          work very well with Thuban and were designed specifically to be image
379          specifically to be image layers in GIS programs.          layers in GIS programs.
380          </para>          </para>
381          </section>          </section>
382    
# Line 412  Line 436 
436    
437    <chapter><title>Layer Classifications</title>    <chapter><title>Layer Classifications</title>
438      <para>      <para>
439        A layer classification is a way of assigning drawing properties to
440        groups of shapes based on attributes stored in the layer's table.
441        Only layer's with shapes can have a classification; image layers
442        cannot be classified.
443        </para>
444        <para>
445        A classification consists of a number of groups, with each group
446        having a value or range of values to match against, and symbol
447        properties which control how a shape is drawn on the map. The user
448        selects which field in the table is used by the classification and
449        when the map is drawn the value for that field for each shape is
450        compared with each group's value. The properties of the first group
451        to match are used to draw the shape. This allows the user to get a
452        visual impression of not only how the data is laid out but also what
453        kind of data lies where.
454        </para>
455        <para>
456        A layer always has a classification. When a new layer is added to the
457        map, a default classification is created with the DEFAULT group. This
458        group cannot be removed. Every shape in the layer, regardless of its
459        attributes, will match this group.
460      </para>      </para>
461    
462          <section><title>Adding and Removing Classes</title>          <section><title>Editing Classifications</title>
463          <para>          <para>
464            A layer's classification can be modified under the properties dialog
465            (<menuchoice>
466            <guimenu>Layer</guimenu>
467            <guimenuitem>Properties</guimenuitem>
468            </menuchoice>). The layer's classification field can be set to None,
469            which simply assigns a DEFAULT group to the classification. No new
470            groups can be added to the classification if the field is None.
471            The user must first select a field to classify on. New groups can
472            be added to the classification with the <guibutton>Add</guibutton>
473            button.
474            </para>
475            <para>
476            The order of the groups in the classification is significant
477            except for the DEFAULT group, which remains at the top. When shapes
478            are matched against groups the matching begins at the first group
479            other than the DEFAULT group so that groups higher in the list will
480            be checked first. Matching for a
481            given shape will stop at the first group that matches. The user can
482            use <guibutton>Move Up</guibutton> and <guibutton>Move Down</guibutton>
483            to change the order of the groups. The DEFAULT group will always
484            match a shape that hasn't matched another group.
485          </para>          </para>
486            <para>
487            The Value column of the classification table is the value that will
488            be matched when the map is being drawn. The type of data that can
489            entered into this field depends on the type of data of the
490            classification field.
491            </para>
492            <para>
493            If the field is of type Text, anything entered
494            into the field is valid. The text will be compared literally to the
495            value of the shape attribute, including case sensitivity.
496            If the type is Integer, then any valid integer may be entered. In
497            addition, with special syntax, a range of values can be entered.
498            A range from <varname>start</varname> to <varname>end</varname>
499            inclusive is specifed like this: <literal>[start;end]</literal>.
500            The exclusive range is specified like this:
501            <literal>]start;end[</literal>. Ranges can include infinity like
502            this: <literal>[-oo;oo]</literal>. Field types can also be of type
503            Decimal. They represent any rational number and can be used in ranges
504            as well.
505            </para>
506          </section>          </section>
507    
508          <section><title>Symbols</title>          <section><title>Symbols</title>
509          <para>          <para>
510            Each type of shape has its own type of symbol. Thuban supports three
511            types of shapes: polygons, lines, and points. Polygons and points have
512            outline and fill color, while lines have only line color. Each group
513            has associated symbol properties. To edit the symbol properties for a
514            group the user can double click on the Symbol column or select a
515            group and click the <guibutton>Edit Symbol</guibutton> button.
516          </para>          </para>
517          </section>          </section>
518    
519          <section><title>Generating Classes</title>          <section><title>Generating Classes</title>
520          <para>          <para>
521            Creating a classification by hand can be tedious.
522            Thuban, therefore, provides a means of generating an entire
523            classification at once while still giving the user control over
524            how it appears. Clicking <guibutton>Generate Class</guibutton>
525            opens the <varname>Generate Classification</varname> dialog.
526            Under the <varname>Generate</varname> pulldown there are at most
527            three different ways to generate classifications:
528            Unique Values, Unique Distribution, and Quantiles. Some options
529            may not be available if they data type for the field does not
530            support them. For instance, <varname>Unique Distribution</varname>
531            doesn't make sense for a Text field.
532          </para>          </para>
533            <para>
534            For every way of generating a classification, a color scheme must
535            be selected. Thuban provides several different color schemes that
536            affect how the group properties change over the classification.
537            It is also possible to create a custom color scheme. Selecting
538            this option will display two symbols: the one of the left has the
539            properties of the first group and the one on the right has the
540            properties of the last group. Thuban will interpolate between these
541            two properties to generate the other groups.
542            </para>
543            <para>
544            The Unique Values option lets the user select specific values that
545            appear in the table. Clicking <guibutton>Retrieve From Table</guibutton>
546            searches the table for all unique values and displays them in the
547            list on the left. Items can be selected and moved to the list on the
548            right. Each list can be sorted or reversed for easier searching.
549            The classification that is generated will be in the same order as
550            the list on the right.
551            </para>
552            <para>
553            The Unique Distribution option creates a user specified number of
554            groups of ranges such that each range covers equal intervals. The
555            minimum and maximum values can automatically be retrieved from the
556            table by clicking <guibutton>Retrieve From Table</guibutton>. The
557            stepping is how large each interval is. Adjusting this value will
558            automatically recalculate how many groups is appropriate.
559            </para>
560            <para>
561            The Quantiles option generates ranges based on the number items
562            in the input set. For example, by specifying 5 groups Thuban will
563            generate groups with appropriate ranges such that 20% of the table
564            data is in each group. If it is impossible to generate exact
565            grouping, Thuban will issue a warning but allow the user to continue.
566            </para>
567          </section>          </section>
568    </chapter>    </chapter>
569    
570    <chapter><title>Projection Management</title>    <chapter><title>Projection Management</title>
571      <para>      <para>
572      </para>      </para>
573            <section><title>Selecting a Projection</title><para/></section>
574            <section><title>Creating a Projection</title><para/></section>
575            <section><title>Editing a Projection</title><para/></section>
576            <section><title>Importing/Exporting Projections</title><para/></section>
577    </chapter>    </chapter>
578    
579    <chapter><title>Table Management</title>    <chapter><title>Table Management</title>
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