Jaime Carrera wrote: > I'm trying to export the boundaries of a vector file, but would like > to avoid duplication of common boundaries. It's easy to know which > boundaries limit a given area, but how can I extract only one > boundary. For example, area 1 has boundaries 6,7,9 while for area 2 > these are 8,9. Is there a way to extract the lines of boundary 8 only > for area 2 in order to avoid duplicating it? A comination of > Vect_get_area_boundaries(&Map,area,List) with something else?
A combination of v.dissolve + v.overlay? note that grass only keeps a single boundary line between two areas, it doesn't duplicate them, 1 for each area. see 'v.clean tool=rmdupl' (well it can handle input data like that but complains that the data is topologically unclean) Hamish ____________________________________________________________________________________ Be a better friend, newshound, and know-it-all with Yahoo! Mobile. Try it now. http://mobile.yahoo.com/;_ylt=Ahu06i62sR8HDtDypao8Wcj9tAcJ _______________________________________________ grass-dev mailing list grass-dev@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/grass-dev