[Mapserver-users] Thematic Mapping

Mon Feb 3 15:47:12 EST 2003

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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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<P><FONT SIZE=3D2 FACE=3D"Arial">Hi Folks,</FONT>
</P>

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?

<P><FONT SIZE=3D2 FACE=3D"Arial">Any other suggestions would be greatly =
appreciated.</FONT>
</P>

<P><FONT SIZE=3D2 FACE=3D"Arial">David Lowther</FONT>
<BR><FONT SIZE=3D2 FACE=3D"Arial">Software Engineer</FONT>
<BR><FONT SIZE=3D2 FACE=3D"Arial">GEO Information Systems</FONT>
<BR><FONT SIZE=3D2 FACE=3D"Arial">University of Oklahoma</FONT>
<BR><FONT SIZE=3D2 FACE=3D"Arial">dlowther at ou.edu</FONT>
<BR><FONT SIZE=3D2 FACE=3D"Arial">(405) 325-3131</FONT>
<BR><A HREF=3D"http://www.geo.ou.edu"><U><FONT COLOR=3D"#0000FF" =
SIZE=3D2 FACE=3D"Arial">http://www.geo.ou.edu</FONT></U></A>
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