[gdal-dev] GDAL does not get correct GCPs from ESRI GeodataXform

[Even Rouault]

Filed as https://github.com/OSGeo/gdal/issues/7484 : At first sight the 
issue is that file uses TIFFTAG_RESOLUTIONUNIT=3 (pixels/cm), whereas 
the current code only deals with TIFFTAG_RESOLUTIONUNIT=2 (pixels/inch)

Le 20/03/2023 à 22:09, Rahkonen Jukka a écrit :
>
> Hi,
>
> I noticed this question in gis.stackexchange 
> https://gis.stackexchange.com/questions/455609/warping-arcgis-9-2-georeferenced-tiffs-using-gdal-warp. 
> It seems that GDAL cannot interpret right the ground control points 
> which are stored into the aux.xml file. I can see that the support for 
> GeodataXform has been improved a few times 
> https://github.com/OSGeo/gdal/search?q=geodataxform&type=commits 
> <https://github.com/OSGeo/gdal/search?q=geodataxform&type=commits> but 
> maybe this dataset (there is a link for downloading test data) has 
> some previously untested sort of aux.xml. The GeoTIFF has wrong GCPs 
> with small pixel values like (16.5886813769484,11.2421187314794) but I 
> made also a test with “--config GDAL_GEOREF_SOURCES PAM” and even by 
> creating a cleaned baseline tiff + PAM file but the GCPs looked still 
> wrong.
>
> -Jukka Rahkonen-
>
>
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