[gdal-dev] gdalwarp does not apply source nodata value to destination

[Etienne Tourigny]

I have just noticed that destination nodata value is not set when
-dstnodata option is not used in gdalwarp.

This can be problematic when warping a dataset with no data values, as the
result can be different from expected, if -dstnodata is not set.
gdalwarp does use source nodata pixels if -srcnodata is not used.

I consider this as a bug (or at the very least a limitation), because one
cannot warp a dataset in an automatic fashion and get expected output (with
same nodata value as input).

Would it be OK to copy them over if -dstnodata is not used, or would there
be problems with doing this? Or perhaps a new argument -copynodata could be
added if there is fear of disruption.

cheers
Etienne
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