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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