> I've noticed that while GDALCreateWarpedVRT does acquire nodata values, and
> thereby nodata-derived masks,
I see provision for that in GDALAutoCreateWarpedVRT(), not in
> from the source dataset, it does not pick up
> on a source's .msk file and does not acquire a source mask derived from
> that sidecar file.
I haven't tested in the warped VRT case, but I believe that should normally be
Are you sure the .msk is properly recognized as a GDAL mask dataset by GDAL ?
when ou do gdalinfo on the source dataset. There is a compulsory metadata item
be set on the .msk. See
"For an external .msk file to be recognized by GDAL," in
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