No answer but same goal from me in a quite different context : I work
with aerial photos under a stereoscope, and happen to make my own
orthophotographs. I need to compare photo-interpretations with other georectified
data.
So I often think it would be perfect if I could "un-project" data with
the reverse transformation used to orthorectify, then superimpose the
result on aerial photos, and finally analyse it under the stereoscope.
Here is an
example ("hand made" so very rough).
Vincent.
Dwight Needels a écrit :
Reverse i.rectify
I have a historic
map that I georeferenced using i.rectify. To help me compare features
to modern maps, I have overlaid a 1’ lon/lat grid.
I would like to display the undistorted original XY map with the
lon/lat grid back-projected on top to show the geometric distortion. In
other words, I want the originally straight lines of the grid displayed
as curves based on the reverse of the i.rectify transformation.
Is there any way to extract the transform parameters and use them to
reverse the i.rectify transformation? Are there other ways to
accomplish something similar?
Thanks,
-Dwight
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