Chloropleth maps with Mapserver

[Stephen Woodbridge]

Gerry,

The dev-list discussion is at Item 21. at 
http://lists.umn.edu/cgi-bin/wa?A1=ind0509&L=mapserver-dev

Posting to the list in case others are interested. If you have input 
that is not covered in the discussion you might want to post it on the 
regular list as the developers also monitor that list also.

-Steve W.


Gerry Creager N5JXS wrote:
> Steve,
> 
> Would it be possible to see some of this discussion?
> 
> Thanks,
> Gerry
> 
> Stephen Woodbridge wrote:
> 
>> Jason,
>>
>> There has been a lot of discussion on this lately, search the archives
>> for subject "Proposed RFC on COLORRAMP Support" on the mapserver-dev
>> list. The issue of where or not there is a way to define the number of
>> color regions dynamically has been an issue of debate. There is some
>> feeling that this should be done using mapscript to dynamically generate
>> N number of classes.
>>
>> -Steve W.
>>
>> Jason Pickering wrote:
>>
>>> I am currently evaluating the capabilities of MapServer to retrieve
>>> data from a Postgresql database and display it on a chlorpleth map.
>>> For instance, I have data like:
>>>
>>> Area      IndicatorValue
>>>
>>> Area 1     10
>>> Area 2    20
>>> Area 3  15
>>> Area 4  20
>>> etc etc
>>>
>>> Each region will be represented by a color, depending on what the
>>> value is in the "IndicatorValue" column. The users need to be able to
>>> select (dynamically) how many color regions will be displayed on the
>>> map, and what the value range of each color is.
>>>
>>> I have searched high and low through the archives, and Google, but
>>> can't seem to find a definitive answer, or better yet, and example of
>>> how this can be done with Mapserver.Any pointers would be most
>>> welcome.
>>>
>>> Best regards,
>>> JPP
>>>
>