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<p>Hum, this error comes from deep in libtiff:
<a class="moz-txt-link-freetext" href="https://github.com/OSGeo/gdal/blob/fec15b146f8a750c23c5e765cac12ed5fc9c2b85/gdal/frmts/gtiff/libtiff/tif_dirread.c#L4802">https://github.com/OSGeo/gdal/blob/fec15b146f8a750c23c5e765cac12ed5fc9c2b85/gdal/frmts/gtiff/libtiff/tif_dirread.c#L4802</a></p>
<p>It would indicate that a TIFF directory (image) has more than
4096 tags, which is highly unlikely for a valid image. The error
is in a source TIFF image. It shouldn't affect the *structure* of
the output TIFF file. It might be an overview of the source image
that is corrupted. So it could potentially affect the content of
the overviews of the target file, but likely not, as GDAL will
likely skip the corrupted source overview and regenerate it.<br>
</p>
<div class="moz-cite-prefix">Le 08/07/2021 ŕ 18:32,
<a class="moz-txt-link-abbreviated" href="mailto:Matt.Wilkie@yukon.ca">Matt.Wilkie@yukon.ca</a> a écrit :<br>
</div>
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<p class="MsoNormal"><span
style="font-size:10.0pt;font-family:"Arial",sans-serif">Related
to my previous question today, what is the nature of
“TIFFFetchDirectory:Sanity check on directory count failed”
error?
<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:10.0pt;font-family:"Arial",sans-serif"><o:p> </o:p></span></p>
<p class="MsoNormal" style="margin-left:36.0pt"><span
style="font-size:10.0pt;font-family:"Courier New"">::
gdal_translate -co compress=zstd -co predictor=yes -co
level=17 -co bigtiff=yes -of cog -a_nodata 0
Finlayson9488_SP7_08Aug2017_150cm.rgb-nir.vrt
out\Finlayson9488_SP7_08Aug2017_150cm.rgb-nir.tif<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:36.0pt"><span
style="font-size:10.0pt;font-family:"Courier New"">Input
file size is 41114, 22580<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:36.0pt"><span
style="font-size:10.0pt;font-family:"Courier New"">0...10...20ERROR
1: TIFFFetchDirectory:Sanity check on directory count
failed, this is probably not a valid IFD offset<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:36.0pt"><span
style="font-size:10.0pt;font-family:"Courier New"">ERROR
1: TIFFReadDirectory:Failed to read directory at offset
16879620<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:36.0pt"><span
style="font-size:10.0pt;font-family:"Courier New"">...30...40...50...60...70...80...90...100
- done.<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:10.0pt;font-family:"Arial",sans-serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-size:10.0pt;font-family:"Arial",sans-serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-size:10.0pt;font-family:"Arial",sans-serif">The
translate run finished successfully and `gdalinfo -mm …`
reports no errors on the output file structure. Visually the
image appears intact. (Is scanning for minmax the best way
to test for a valid file? I’ve been using it that way for
years but maybe it’s not best practice.)<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:10.0pt;font-family:"Arial",sans-serif"><o:p> </o:p></span></p>
<p class="MsoNormal"
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style="font-size:9.0pt;line-height:115%;font-family:"Arial",sans-serif;mso-fareast-language:EN-CA"
lang="EN-US">Matt Wilkie</span></b><span
style="font-size:9.0pt;line-height:115%;font-family:"Arial",sans-serif;mso-fareast-language:EN-CA"
lang="EN-US"><o:p></o:p></span></p>
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style="font-size:9.0pt;font-family:"Arial",sans-serif;mso-fareast-language:EN-CA"
lang="EN-US">Geomatics Developer & Administrator<o:p></o:p></span></p>
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lang="EN-US">Environment
<span style="color:#2E74B5">|</span> Technology, Innovation
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<pre class="moz-quote-pre" wrap="">_______________________________________________
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<pre class="moz-signature" cols="72">--
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My software is free, but my time generally not.</pre>
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