Hi Stefan, On Sun, Nov 24, 2013 at 6:44 PM, Stefan Kiefer <st_kiefer at web.de> wrote: ... (I cannot say much about Ubuntu) > Is there anyone working successfully with i.ortho.photo (grass 6.4)? Yes. You may take a look at this GRASS book chapter: http://www.grassbook.org/ --> Sample chapter: --> Aerial + Ortho --> PDF Best Markus