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<p>Jon,</p>
<p>Recommended solution: use GDALRasterBand::GetDataCoverageStatus()
with nXOff, nYOff, nXSize, nYSize matching tile offset and size
and check for<span class="n"> GDAL_DATA_COVERAGE_STATUS_EMPTY. Cf
<a class="moz-txt-link-freetext" href="https://gdal.org/development/rfc/rfc63_sparse_datasets_improvements.html">https://gdal.org/development/rfc/rfc63_sparse_datasets_improvements.html</a></span></p>
<p><span class="n">(undocumented solution, mostly used for internal
testing:
rasterBand->GetMetadataItem("BLOCK_SIZE_{block_x_offset}_{block_y_offset}",
"TIFF") where </span><span class="n">{block_x_offset} /
{block_y_offset} must be replaced by the block index along x and
y.</span><span class="n"> If it returns "0", it is a sparse
block.)</span></p>
<p><span class="n">Even<br>
</span></p>
<div class="moz-cite-prefix">Le 28/06/2024 à 15:04, Jon Morris via
gdal-dev a écrit :<br>
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<p class="MsoNormal"><span style="font-size:11.0pt">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?<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">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?<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">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).<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">Thanks,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">Jon<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><b><span
style="font-size:11.0pt;font-family:"Arial",sans-serif">Jon
Morris<o:p></o:p></span></b></p>
<p class="MsoNormal"><b><span
style="font-size:11.0pt;font-family:"Arial",sans-serif;color:gray">Software
Developer<o:p></o:p></span></b></p>
<p class="MsoNormal"><span
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<p class="MsoNormal"><o:p> </o:p></p>
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My software is free, but my time generally not.</pre>
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