Jon,
Recommended solution: use GDALRasterBand::GetDataCoverageStatus() with
nXOff, nYOff, nXSize, nYSize matching tile offset and size and check
forGDAL_DATA_COVERAGE_STATUS_EMPTY. Cf
https://gdal.org/development/rfc/rfc63_sparse_datasets_improvements.html
(undocumented solution, mostly used for internal testing:
rasterBand->GetMetadataItem("BLOCK_SIZE_{block_x_offset}_{block_y_offset}",
"TIFF") where {block_x_offset} / {block_y_offset} must be replaced by
the block index along x and y.If it returns "0", it is a sparse block.)
Even
Le 28/06/2024 à 15:04, Jon Morris via gdal-dev a écrit :
We usually use the SPARSE_OK option when creating GTiffs, but as a lot
of our clients use ArcGIS, we need to ensure that the sparse option is
not used for client deliverables. After a tiff has been created
though, it’s not easy to tell whether it is sparse or not. Is there an
easy way of detecting which rasters are sparse and therefore cannot be
sent to clients?
Using tiffinfo -D test.tif seems to give an error message like
“TIFFFillTile: 0: Invalid tile byte count, tile 0.” , so I’ve been
using this to check, but is there a better way?
Or have Esri started supporting sparse rasters, and if so, does anyone
know which version of ArcMap 10.x? (Our clients are mostly on older
versions, not sure if any are using Pro yet).
Thanks,
Jon
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