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<p>Hi Jukka,</p>
<p>from what I can see in
<a class="moz-txt-link-freetext" href="https://github.com/OSGeo/gdal/commit/b5128c1ff3ac6ad44b225284f5be1f728840e7b3">https://github.com/OSGeo/gdal/commit/b5128c1ff3ac6ad44b225284f5be1f728840e7b3</a>,
this dates back to almost 20 years ago when SetGCPs() was
initially implemented. And at that time, PAM didn't exist yet in
GDAL :-)</p>
<p>Please create a ticket about (and mention SetGeoTransform() and
SetSpatialRef() have the same issue)</p>
<p>Even<br>
</p>
<div class="moz-cite-prefix">Le 22/11/2021 à 14:49, Rahkonen Jukka
(MML) a écrit :<br>
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cite="mid:117489fa5a0545668985b0ce3fd3d02d@maanmittauslaitos.fi">
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<p class="MsoNormal">Hi,<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span lang="EN-US">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<br>
<br>
gdal_edit -ro -gcp 1 1 20 30 test.tif <br>
ERROR 6: test.tif: SetGCPs() is only supported on newly
created GeoTIFF files.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">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.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">-Jukka Rahkonen-<o:p></o:p></span></p>
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<pre class="moz-quote-pre" wrap="">_______________________________________________
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<pre class="moz-signature" cols="72">--
<a class="moz-txt-link-freetext" href="http://www.spatialys.com">http://www.spatialys.com</a>
My software is free, but my time generally not.</pre>
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