[gdal-dev] Produce noData Masks When Warping Datasets

Jeremy Armstrong JArmstrong at geologic.com
Tue Dec 17 13:25:17 PST 2013


Hi List,

I am using GDALAutoCreateWarpedVRT() to warp datasets which then get transformed to bitmaps.   When warping images sometimes they get rotated leaving black around the edges of the resulting image (especially when warping to another UTM zone).  How can I produce images without the black edges?  As far as I can tell, GDAL won't probuce bitmaps with alpha layering.  I have read about GDAL's noData masks but am having trouble figuring out how to produce them.  They would work well because I don't need opacity I just want to mask out the black edges when I display the bitmaps.

Thanks,
Jeremy
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