Thematic mapping is best done using postgis. You can do multiple tables
joins and thematic rendering very easily and efficiently. You can do
some basic stuff with ogr, but I would strongly recommend that you look
at postgis. The nice thing about mapserver is that you only need to load
just the polygons and the attributes needed for the thematic mapping and
all the rest of the data can stay in shapefiles.
-Steve
Ravi wrote:
Hi David,
I am not original poster but I have similar requirement.
I would like to shade polygons based on some data I have in a second
.dbf file (or data in a mysql server).
Thanks for helping
Ravi
Fawcett, David wrote:
Matt,
For question #1, are you talking about the .dbf that is part of the
shapefile, or a second .dbf that you would like to join to?
For question #2, I would just suggest downloading the legislative
district shapefiles from the MN Legislative GIS Office:
http://www.gis.leg.mn/metadata/leg02.htm (there is a download link in
the metadata)
David.
-----Original Message-----
*From:* UMN MapServer Users List
[mailto:[EMAIL PROTECTED] *On Behalf Of *Matt Pettis
*Sent:* Monday, October 23, 2006 10:58 AM
*To:* [email protected]
*Subject:* [UMN_MAPSERVER-USERS] Shading Polygons and removing
internal boundaries from shapefiles
Hi,
I just installed MapServer because I want to do some graphical
shading of polygons that represent MN voting precints. I have two
particular questions:
1. Is there an example mapfile or mapscript that helps me
understand how to shade polygons on a scale based upon a numeric
value in a .dbf file?
2. I want to graphically show Legislative districts, and I have
voting precint shapefiles. How do I aggregate precints that belong
to a legislative district and make that one polygon, erasing the
lines that would be internal to this aggregated region?
