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

[Rahkonen Jukka]

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 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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