Hi, On Wed, Oct 17, 2012 at 7:50 PM, António Rocha <antonio.ro...@deimos.com.pt> wrote: > Greetings, > Is there any GRASS module that can be used to river and road extraction from > satellite images? Some feature extraction algorithm
you can try new (and experimental) modules from grass7 addons - i.edge and r.houghtransform. i.edge is for detecting edges using canny edge detection algorithm [1] and r.houghtransform uses hough transformation [2] to detect straight lines (maybe good for roads but not usable for rivers). r.houghtransform can take the output of i.edge as an input. Unfortunately there is no information in the man page yet but you can always ask. Anna [1] http://en.wikipedia.org/wiki/Canny_edge_detector [2] http://en.wikipedia.org/wiki/Hough_transform > Thank you > Regards, > Antonio Rocha > _______________________________________________ > grass-user mailing list > grass-user@lists.osgeo.org > http://lists.osgeo.org/mailman/listinfo/grass-user _______________________________________________ grass-user mailing list grass-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/grass-user
