[mapserver-users] Where is the raster classifier code in Mapserver?

Frank Warmerdam warmerdam at pobox.com
Tue Jan 13 17:02:25 EST 2009

Roger André wrote:
> This is probably a question for Frank W..  I'd like to re-write the 
> raster classifier in Mapserver so that it can apply a linear color 
> gradient using LUTs.  I've got code written already to do this with the 
> Python API to GDAL, and would like to be able to do the same thing in 
> Mapserver.  Can someone point me to the right C code?


The core of the existing classification logic is msGetClass() in mapraster.c.
Also if you search on "classified" in mapdrawgdal.c you will see most
of the places it gets used.

I believe that ramp based gradients should be written up as an RFC.  There
was a previous effort which I think was partially implemented.  I would
suggest you dig up information on it, before going too far.


Best regards,
I set the clouds in motion - turn up   | Frank Warmerdam, warmerdam at pobox.com
light and sound - activate the windows | http://pobox.com/~warmerdam
and watch the world go round - Rush    | Geospatial Programmer for Rent

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