Hum, this error comes from deep in libtiff:
https://github.com/OSGeo/gdal/blob/fec15b146f8a750c23c5e765cac12ed5fc9c2b85/gdal/frmts/gtiff/libtiff/tif_dirread.c#L4802
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.
Le 08/07/2021 à 18:32, matt.wil...@yukon.ca a écrit :
Related to my previous question today, what is the nature of
“TIFFFetchDirectory:Sanity check on directory count failed” error?
:: 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
Input file size is 41114, 22580
0...10...20ERROR 1: TIFFFetchDirectory:Sanity check on directory count
failed, this is probably not a valid IFD offset
ERROR 1: TIFFReadDirectory:Failed to read directory at offset 16879620
...30...40...50...60...70...80...90...100 - done.
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.)
*Matt Wilkie*
Geomatics Developer & Administrator
Environment | Technology, Innovation and Mapping
T 867-667-8133 | _Yukon.ca <http://yukon.ca/>_
/Hours: 08:30-16:30, Mon-Wed: Office, Thu: Remote, Fri: Away./
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