Milton wrote: > Following Markus Neteler (and other) suggestioins, I was able to > automatically generate a ground control point file for a large set of > images. > > Now I have (at least) two directions. > 1. rectify the image using i.rectify > 2. use gdalwarp out of grass > > In both ways I face the same issues: a) how can I input my text file > for a certain image and b) what is the proper format that I need to > follow when preparing the file (for both i.rectify and gdalwarp)? > > Detail: the images are JPG fotos taken using a fixed camera in the > top of a tower, so the images are nearly the same scene.
Hi, If are familair with Bourne shell scripting, you might have a look in the grass6 addons SVN for i.warp and i.points.reproj scripts. (i.warp is a bit of a mess, but uses gdalwarp with grass's POINTS gcp file) the grass POINTS gcp file is pretty easy format, # image target status # east north east north (1=ok) # 2.537267 10.230953 1393516.340000 4902494.780000 1 8.038078 10.219225 1419326.280000 4903305.400000 1 13.531500 10.212226 1445136.430000 4904007.830000 1 8.029718 2.291376 1420414.870000 4866269.910000 1 2.531090 2.302488 1394760.640000 4865459.670000 1 19.005416 10.198488 1470946.750000 4904602.120000 1 18.987968 2.271928 1471724.120000 4867566.030000 1 13.519234 2.281374 1446060.020000 4867342.380000 1 6.186646 14.579820 1410021.804000 4923820.667000 1 5.233682 14.892164 1403912.826000 4925688.745000 0 4.728343 14.134303 1403217.899000 4921427.914000 1 8.716253 13.454576 1421998.543000 4918833.269000 1 regards, Hamish _______________________________________________ grass-user mailing list grass-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/grass-user