If it is not possible to get this information, could you point out the
code snippet that performs the rectification step?
Since GDAL's code base is quite large, it is not easy to find the
appropriate location.
Entry point of the logic to compute the transformation from source pixel
coordinates to target pixel coordinates
https://github.com/OSGeo/gdal/blob/master/gdal/alg/gdaltransformer.cpp#L1380
And in the first step of this transformation, when using polynomial
adjustment of GCPs, you'll use:
https://github.com/OSGeo/gdal/blob/master/gdal/alg/gdal_crs.cpp
Even
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