This is a long shot but if it was me I'd play with a virtual raster: gdalbuildvrt -srcnodata "-999" -vrtnodata "255 255 255" mosaic100.vrt mosaic100.tif My example above is probably not correct. It's assuming a single band or channel input and 3 bands/channel output but hopefully you get my idea.
Rich On Fri, Jan 31, 2014 at 2:18 PM, Smith, Michael <[email protected]>wrote: > Hi group, > > > > I am having a heck of a time figuring out how to have MapServer ignore > NODATA values in a WMS. Please help! > > > > ***THE DATA > > > > GDAL shows the NODATA value of this TIFF to be -999: > > > > C:\WorkSpace\medem2>gdalinfo mosaic100.tif > > <snip> > > NoData Value=-999 > > > > I also confirmed this in ArcGIS, the NoData pixels do not draw. The > raster is a 32-bit float (a DEM). > > > > ***THE MAPFILE > > > > I have tried the following, which the docs all indicate should work: > > > > PROCESSING "NODATA=-999" (nodata pixels show as black) > > > > PROCESSING "SCALE=-3,950" (again nodata pixels -999 show as black, it > does scale the rest of the data) > > > > CLASS > > EXPRESSION ([pixel] > -999) (whole image is white) > > END > > > > PROCESSING "LUT=0:0,100:128,500:192,951:255" (nodata pixels show black, > it does apply the LUT correctly otherwise) > > > > ***CHECK IT OUT > > > > You can see this for yourself if you like, use this WMS: > > > http://mapserver.maine.gov/wms/mapserv.exe?map=c:/wms/topos.map&; > > > > Choose the Maine_DEM_2m group > > > > =============================== > *Michael Smith MS GISP* > State GIS Manager, Maine Office of GIS > State of Maine, Office of Information Technology > *michael.smith _at_ maine.gov <http://maine.gov>* 207-215-5530 > > Board Member, Maine GeoLibrary > Education Chair, Maine GIS Users Group > State Rep, National States Geographic Information Council > > > State House Station 145 > 51 Commerce Drive > Augusta, ME 04333-0145 > 69o 47' 58.9"W 44o 21' 54.8"N > > _______________________________________________ > mapserver-users mailing list > [email protected] > http://lists.osgeo.org/mailman/listinfo/mapserver-users > -- Richard Greenwood [email protected] www.greenwoodmap.com
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