Hi Jukka,
from what I can see in
https://github.com/OSGeo/gdal/commit/b5128c1ff3ac6ad44b225284f5be1f728840e7b3,
this dates back to almost 20 years ago when SetGCPs() was initially
implemented. And at that time, PAM didn't exist yet in GDAL :-)
Please create a ticket about (and mention SetGeoTransform() and
SetSpatialRef() have the same issue)
Even
Le 22/11/2021 à 14:49, Rahkonen Jukka (MML) a écrit :
Hi,
I tried to add ground control points into a TIFF file with gdal_edit.
I do not want to touch the TIFF so I used the read-only option and
supposed that gcp would be written into .aux.xml file but that did not
happen. Instead I got a message
gdal_edit -ro -gcp 1 1 20 30 test.tif
ERROR 6: test.tif: SetGCPs() is only supported on newly created
GeoTIFF files.
Without -ro gdal_edit adds ground control points into the TIFF without
errors. What might be the meaning of the message about “newly created
GeoTIFF” and is there some way to make gdal_edit to write ground
control points into PAM file? I know that I can use gdal_translate and
VRT as a workaround but PAM .aux.xml could be a bit better for my
whole workflow.
-Jukka Rahkonen-
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