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<p class=MsoNormal><font size=2 face=Arial><span lang=EN-GB style='font-size:
10.0pt;font-family:Arial'>Hi developers,<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-GB style='font-size:
10.0pt;font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-GB style='font-size:
10.0pt;font-family:Arial'>I’m not sure if somebody has already recognized
the following problem.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-GB style='font-size:
10.0pt;font-family:Arial'>I found out that the bar charts in mapserver 5.0 are
not really useful for thematic mapping. Bar charts of different features in a
map are not comparable with each other because the maximum values in each chart
have the same size (height).<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-GB style='font-size:
10.0pt;font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-GB style='font-size:
10.0pt;font-family:Arial'>For example I have two features with the following
attributes:<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-GB style='font-size:
10.0pt;font-family:Arial'>Feature A: 1000, 500, 200<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-GB style='font-size:
10.0pt;font-family:Arial'>Feature B: 2000, 1000, 400<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-GB style='font-size:
10.0pt;font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-GB style='font-size:
10.0pt;font-family:Arial'>Both features have exactly the same bar chart in the
same size (height) which I have defined for example with PROCESSING
"CHART_SIZE=30 40". This gives a wrong map and a wrong impression to
the map reader. The height of the bars of Feature A should only be the half of
the bars heights of Feature B.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-GB style='font-size:
10.0pt;font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-GB style='font-size:
10.0pt;font-family:Arial'>My impression is that the maximum value of the given
attributes for one feature is always drawn with the defined height. All other
values in this chart are drawn relative to this height. <o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-GB style='font-size:
10.0pt;font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-GB style='font-size:
10.0pt;font-family:Arial'>It would be better to define a global height for a value
(for example 30 pixels is equivalent to 2000). All bars of all charts should
then be drawn relative to this definition.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-GB style='font-size:
10.0pt;font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-GB style='font-size:
10.0pt;font-family:Arial'>Another very useful function for thematic mapping
would be the possibility to vary the size (diameter) of pie charts relative to
an attribute or the sum of the values which are used for drawing the pie
slices.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-GB style='font-size:
10.0pt;font-family:Arial'>But I found out that this is already in the works and
will hopefully come with version 5.2 (see
http://trac.osgeo.org/mapserver/ticket/2136).<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-GB style='font-size:
10.0pt;font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Best regards,<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Karsten Hoffmann<o:p></o:p></span></font></p>
<p class=MsoAutoSig><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>--<o:p></o:p></span></font></p>
<p class=MsoAutoSig><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Dipl.-Geogr. Karsten Hoffmann<o:p></o:p></span></font></p>
<p class=MsoAutoSig><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Institut für Geoinformatik und Fernerkundung (IGF)<o:p></o:p></span></font></p>
<p class=MsoAutoSig><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Universität Osnabrück<o:p></o:p></span></font></p>
<p class=MsoAutoSig><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Seminarstr. 19 a/b<o:p></o:p></span></font></p>
<p class=MsoAutoSig><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>49069 Osnabrück<o:p></o:p></span></font></p>
<p class=MsoAutoSig><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoAutoSig><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Raum: 02/106<o:p></o:p></span></font></p>
<p class=MsoAutoSig><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Tel.: +49 541 969-4233<o:p></o:p></span></font></p>
<p class=MsoAutoSig><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Fax: +49 541 969-4061<o:p></o:p></span></font></p>
<p class=MsoAutoSig><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>E-Mail: khoffmann@igf.uni-osnabrueck.de<o:p></o:p></span></font></p>
<p class=MsoAutoSig><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Web: <a href="http://www.igf.uni-osnabrueck.de">www.igf.uni-osnabrueck.de</a><o:p></o:p></span></font></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><o:p> </o:p></span></font></p>
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