I started using the display to set the target region and g.region to set the resolution. I also run the georeferencing rutine at low resolution first to more accuratly determine the target area and then run at higher resolution for the final product. The whole process (setting GCPs and running at different resolutions) takes about an hour per aerial photo, which is acceptable. The quality of the final image is very close to that of the source image.
Thanks to everyone for their help. Luis E. Menoyo U.S. Geological Survey 677 Ala Moana Blvd., Suite 415 Honolulu, HI 96813 [EMAIL PROTECTED] 808-587-2428 Hamish <[EMAIL PROTECTED]> 01/22/08 03:14 PM To Luis E Menoyo <[EMAIL PROTECTED]>, [email protected] cc Subject Re: [GRASS-user] i.rectify - how long is too long Luis E Menoyo wrote: > It looks like i.rectify processes the complete target area instead of > just the image area to be rectified. tip: use v.in.region + v.proj to set up target region / resolution prior to using r.proj or i.rectify. Hamish ____________________________________________________________________________________ Be a better friend, newshound, and know-it-all with Yahoo! Mobile. Try it now. http://mobile.yahoo.com/;_ylt=Ahu06i62sR8HDtDypao8Wcj9tAcJ
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