[MS4W-Users] Classifying rasters

Michael Smith MichaelS at abag.ca.gov
Thu Jun 2 17:29:53 EST 2011

Just a quick question regarding classifying raster display in MapServer to make sure I understand the documentation correctly. Is it true that the only way to classify raster display values in MapServer is if there is a single attribute value (pixel), or three to four (RGBA) if the raster is color?

I ask because I have a number of rasters with attribute tables that have multiple columns of attributes per pixel. I currently classify some of these rasters using ESRI software using multiple attributes to determine which color is displayed for each pixel (for example: landcov = 1 AND urban = 0 would display as red). Before going through the process of reclassifying the rasters so there is only a single range of values, or converting them to polygons, I just wanted to make sure I was not missing anything.

- Michael

Michael Smith
GIS Coordinator
Association of Bay Area Governments
Ph:  510.464.7948
Fax: 510.464.7970
michaels at abag.ca.gov 

PS - Hello to all the Michael Smiths! Heard there were a number of us on the list when I posted my first question.

More information about the MS4W-Users mailing list