[Mapserver-users] Thematic Mapping

Mon Feb 3 12:48:42 PST 2003

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Here's a link to the existing app:

http://www.geo.ou.edu/botanical/ <http://www.geo.ou.edu/botanical/> 

-----Original Message-----
From: Lowther, David W [mailto:dlowther at ou.edu] 
Sent: Monday, February 03, 2003 2:47 PM
To: Mapserver-Users (mapserver-users at lists.gis.umn.edu)
Subject: [Mapserver-users] Thematic Mapping

Hi Folks, 

I have an application in place for a client that returns a list of hits by
county based on search criteria. The user then has the option to map these
results shading counties with more results darker and those with less
lighter. The number of classes is set, but the current application decides
what the upper and lower bounds for each class should be based on the total
number of results. So that the class ranges fit the total number of data
elements. 

My first though on moving this to mapserver was that I would need to set up
a layer with the right number of classes and set the mapfile for the
classitem. Then use the map_layername_classname_expression to set the
expression for each class. Is this the best way to do this or is there any
built in thematic mapping capability that I should check out?

Any other suggestions would be greatly appreciated. 

David Lowther 
Software Engineer 
GEO Information Systems 
University of Oklahoma 
dlowther at ou.edu 
(405) 325-3131 
 <http://www.geo.ou.edu> http://www.geo.ou.edu 

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<DIV>Here's 
a link to the existing app:</DIV>
<DIV> </DIV>
<DIV><A 
href="http://www.geo.ou.edu/botanical/">http://www.geo.ou.edu/botanical/</A></DIV>
<BLOCKQUOTE style="MARGIN-RIGHT: 0px">
 <DIV></DIV>
 <DIV class=OutlookMessageHeader lang=en-us dir=ltr align=left>-----Original Message----- From: Lowther, David W 
 [mailto:dlowther at ou.edu] Sent: Monday, February 03, 2003 2:47 
 PM To: Mapserver-Users 
 (mapserver-users at lists.gis.umn.edu) Subject: [Mapserver-users] 
 Thematic Mapping </DIV>
 Hi Folks, 
 I have an application in place for a client that 
 returns a list of hits by county based on search criteria. The user then has 
 the option to map these results shading counties with more results darker and 
 those with less lighter. The number of classes is set, but the current 
 application decides what the upper and lower bounds for each class should be 
 based on the total number of results. So that the class ranges fit the total 
 number of data elements. 
 My first though on moving this to mapserver was 
 that I would need to set up a layer with the right number of classes and set 
 the mapfile for the classitem. Then use the map_layername_classname_expression 
 to set the expression for each class. Is this the best way to do this or is 
 there any built in thematic mapping capability that I should check 
 out?
 Any other suggestions would be greatly 
 appreciated. 
 David Lowther Software Engineer GEO Information 
 Systems University of Oklahoma 
 dlowther at ou.edu (405) 325-3131 <A href="http://www.geo.ou.edu">http://www.geo.ou.edu</A> 
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