Hi Sean > > I've noticed that while GDALCreateWarpedVRT does acquire nodata values, and > thereby nodata-derived masks,
I see provision for that in GDALAutoCreateWarpedVRT(), not in GDALCreateWarpedVRT() > 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 automatically done by https://github.com/OSGeo/gdal/blob/trunk/gdal/alg/gdalwarpoperation.cpp#L2022 Are you sure the .msk is properly recognized as a GDAL mask dataset by GDAL ? For example when ou do gdalinfo on the source dataset. There is a compulsory metadata item that must be set on the .msk. See "For an external .msk file to be recognized by GDAL," in https://trac.osgeo.org/gdal/wiki/ rfc15_nodatabitmask Even -- Spatialys - Geospatial professional services http://www.spatialys.com
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