Hi,
I am trying to georeference old maps in two steps: first georeferencing
them from the old projection to a modern one, and then ameliorating the
georeferenced image by rubber-sheeting it on the base of control points,
mostly triangulation points for which the coordinates in the old and new
maps are known.
The second step causes trouble: if I add control points to the
georeferenced image with gdal_translate -gcp , the projection
information gets lost.
Yet, AFAICS it should be possible: if I use gdaltransform -s_srs
EPSG:28992 -t_srs EPSG:28992 -gcp ... , I can use control points with
coordinates in EPSG:28992 and get a correct transformation.
So: regarding this behavior of gdal_translate, to discard projection
information when control points are added: is it a bug or is it the
expected behavior? In the last case, how can I rubber-sheet an already
georeferenced map?
Jan
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