Hi Even, On Mon, Feb 19, 2018 at 5:42 AM, Even Rouault <even.roua...@spatialys.com> wrote:
> 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() > Yes, sorry, I meant to write GDALAutoCreateWarpedVRT(). > > > > 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 > Yes, gdalinfo detects the mask: gdalinfo '/vsicurl/ http://oin-hotosm.s3.amazonaws.com/5a324a622553e6000ce5aaf5/0/3fa181a1-425c-4e53-b49f-ea72884da097.tif ' Driver: GTiff/GeoTIFF Files: /vsicurl/ http://oin-hotosm.s3.amazonaws.com/5a324a622553e6000ce5aaf5/0/3fa181a1-425c-4e53-b49f-ea72884da097.tif /vsicurl/ http://oin-hotosm.s3.amazonaws.com/5a324a622553e6000ce5aaf5/0/3fa181a1-425c-4e53-b49f-ea72884da097.tif.msk Size is 48948, 15632 ... Band 1 Block=512x512 Type=Byte, ColorInterp=Red Overviews: 24474x7816, 12237x3908, 6119x1954, 3060x977, 1530x489, 765x245, 383x123 Mask Flags: PER_DATASET Overviews of mask band: 24474x7816, 12237x3908, 6119x1954, 3060x977, 1530x489, 765x245, 383x123 Unit Type: metre Band 2 Block=512x512 Type=Byte, ColorInterp=Green Overviews: 24474x7816, 12237x3908, 6119x1954, 3060x977, 1530x489, 765x245, 383x123 Mask Flags: PER_DATASET Overviews of mask band: 24474x7816, 12237x3908, 6119x1954, 3060x977, 1530x489, 765x245, 383x123 Unit Type: metre Band 3 Block=512x512 Type=Byte, ColorInterp=Blue Overviews: 24474x7816, 12237x3908, 6119x1954, 3060x977, 1530x489, 765x245, 383x123 Mask Flags: PER_DATASET Overviews of mask band: 24474x7816, 12237x3908, 6119x1954, 3060x977, 1530x489, 765x245, 383x123 Unit Type: metre I'm using GDAL 2.2.2. -- Sean Gillies
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