<div dir="ltr"><div>This is a long shot but if it was me I'd play with a virtual raster:<br> gdalbuildvrt -srcnodata "-999" -vrtnodata "255 255 255" mosaic100.vrt mosaic100.tif<br></div>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.<br>
<br>Rich<br><div><br></div></div><div class="gmail_extra"><br><br><div class="gmail_quote">On Fri, Jan 31, 2014 at 2:18 PM, Smith, Michael <span dir="ltr"><<a href="mailto:Michael.Smith@maine.gov" target="_blank">Michael.Smith@maine.gov</a>></span> wrote:<br>
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<p class="MsoNormal">Hi group,<u></u><u></u></p>
<p class="MsoNormal"><u></u> <u></u></p>
<p class="MsoNormal">I am having a heck of a time figuring out how to have MapServer ignore NODATA values in a WMS. Please help!<u></u><u></u></p>
<p class="MsoNormal"><u></u> <u></u></p>
<p class="MsoNormal">***THE DATA<u></u><u></u></p>
<p class="MsoNormal"><u></u> <u></u></p>
<p class="MsoNormal">GDAL shows the NODATA value of this TIFF to be -999:<u></u><u></u></p>
<p class="MsoNormal"><u></u> <u></u></p>
<p class="MsoNormal">C:\WorkSpace\medem2>gdalinfo mosaic100.tif<u></u><u></u></p>
<p class="MsoNormal"> <snip><u></u><u></u></p>
<p class="MsoNormal"> NoData Value=-999<u></u><u></u></p>
<p class="MsoNormal"><u></u> <u></u></p>
<p class="MsoNormal">I also confirmed this in ArcGIS, the NoData pixels do not draw. The raster is a 32-bit float (a DEM).<u></u><u></u></p>
<p class="MsoNormal"><u></u> <u></u></p>
<p class="MsoNormal">***THE MAPFILE<u></u><u></u></p>
<p class="MsoNormal"><u></u> <u></u></p>
<p class="MsoNormal">I have tried the following, which the docs all indicate should work:<u></u><u></u></p>
<p class="MsoNormal"><u></u> <u></u></p>
<p class="MsoNormal"> PROCESSING "NODATA=-999" (nodata pixels show as black)<u></u><u></u></p>
<p class="MsoNormal"><u></u> <u></u></p>
<p class="MsoNormal"> PROCESSING “SCALE=-3,950” (again nodata pixels -999 show as black, it does scale the rest of the data)<u></u><u></u></p>
<p class="MsoNormal"><u></u> <u></u></p>
<p class="MsoNormal"> CLASS<u></u><u></u></p>
<p class="MsoNormal"> EXPRESSION ([pixel] > -999) (whole image is white)<u></u><u></u></p>
<p class="MsoNormal"> END<u></u><u></u></p>
<p class="MsoNormal"><u></u> <u></u></p>
<p class="MsoNormal"> PROCESSING "LUT=0:0,100:128,500:192,951:255" (nodata pixels show black, it does apply the LUT correctly otherwise)<u></u><u></u></p>
<p class="MsoNormal"><u></u> <u></u></p>
<p class="MsoNormal">***CHECK IT OUT<u></u><u></u></p>
<p class="MsoNormal"><u></u> <u></u></p>
<p class="MsoNormal">You can see this for yourself if you like, use this WMS:<u></u><u></u></p>
<p class="MsoNormal"> <a href="http://mapserver.maine.gov/wms/mapserv.exe?map=c:/wms/topos.map&" target="_blank">
http://mapserver.maine.gov/wms/mapserv.exe?map=c:/wms/topos.map&</a><u></u><u></u></p>
<p class="MsoNormal"><u></u> <u></u></p>
<p class="MsoNormal">Choose the Maine_DEM_2m group<u></u><u></u></p>
<p class="MsoNormal"><u></u> <u></u></p>
<p class="MsoNormal"><span style="font-size:10.0pt;color:#1f497d">===============================<br>
<b>Michael Smith MS GISP</b><br>
State GIS Manager, Maine Office of GIS<br>
State of Maine, Office of Information Technology<br>
<i>michael.smith _at_ <a href="http://maine.gov" target="_blank">maine.gov</a></i> <a href="tel:207-215-5530" value="+12072155530" target="_blank">207-215-5530</a><br>
<br>
Board Member, Maine GeoLibrary<br>
Education Chair, Maine GIS Users Group<br>
State Rep, National States Geographic Information Council</span><span style="font-size:12.0pt;font-family:"Times New Roman","serif""><br>
</span><span style="font-size:12.0pt;font-family:"Times New Roman","serif""><img src="cid:image001.jpg@01CF1E9E.2C978FB0" border="0" height="68" width="299"></span><span style="font-size:12.0pt;font-family:"Times New Roman","serif""><br>
<br>
</span><span style="font-size:8.0pt;color:#1f497d">State House Station 145<br>
51 Commerce Drive<br>
Augusta, ME 04333-0145<br>
69<sup>o</sup> 47' 58.9"W 44<sup>o</sup> 21' 54.8"N</span><span style="font-size:12.0pt;font-family:"Times New Roman","serif"">
</span><u></u><u></u></p>
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<a href="http://www.greenwoodmap.com">www.greenwoodmap.com</a>
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