[gdal-dev] Missing Alpha flag for Warped VRT Single band UInt16 dataset

[Vincent Sarago]

Previous discussion can be found in https://github.com/mapbox/rasterio/issues/1403 <https://github.com/mapbox/rasterio/issues/1403>

When creating Warped VRT of a 1band Uint16 dataset with internal mask, gdal creates an Alpha band but don’t seems to set the Alpha/Mask flags.

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