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 207-215-5530
Board Member, Maine GeoLibrary
Education Chair, Maine GIS Users Group
State Rep, National States Geographic Information Council
[cid:[email protected]]
State House Station 145
51 Commerce Drive
Augusta, ME 04333-0145
69o 47' 58.9"W 44o 21' 54.8"N
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