Hello Markus Thank you for your answer. Just a few more questions :)
For orthorectification, you should use a recent version of GRASS > (6.4.2) and not 6.4.0 because the orthorectification procedure has > been recently overhauled and is creating artefacts in earlier versions > of GRASS, particularly for mountainous terrain. > > Thanks > There is no preprocessing required before orthorectification, apart > from the organisation of the imagery. The imagery to be orthorectified > should be in a xy location. A separate location with the target CRS > must exist and should hold reference imagery if you do not have Ground > Control Points. > > 1- My VHR image has already coordinates. Is this a problem? 2- Shall I apply Geometric Correction procedure before Orthorectification? > There will soon (within the next weeks I hope) be an article available > in Computer and Geosciences explaining the orthorectification > procedure in GRASS, entitled "Robust rectification of aerial > photographs in an Open Source environment". > > Is it possible tyo have acces to the draft version? Thank you Kat
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