[Gdal-dev] setting nodata for gdalwarp result

[Dylan Beaudette]

Greetings,

I am warping many images, and would like to set the destination nodata to a 
value which will allow me to mask out the projection artifacts (collar) when 
displaying these images with Mapserver. The source data are DOQQ (black and 
white) in a variety of UTM coordinate systems. In projecting them to AEA, a 
large 'collar' is introduced in the areas where the image was rotated. Up 
until now I have told Mapserver to ignore black pixels, but this has the 
obvious side-effect of throwing out *real* black pixels.

I am using the -dstnodata -9999 to set the new nodata pixels to something 
other than black (0) ... but this does not seem to work.

Any thoughts on how to do this would be greatly appreciated.

cheers,

-- 
Dylan Beaudette
Soils and Biogeochemistry Graduate Group
University of California at Davis
530.754.7341