Dear Grass users, I have a vector stream network map of a single basin (so only a stream "tree")...
each stream segment is correctly oriented downstream (the direction of each vector is from higher to lower elevation..) I would like to select a random segment of the "tree" and automatically obtain only the upstream segments.. i.e. I would like to obtain a new map containing only the upstream stream segments of the selected one... (that is the same of removing those downstream) obviously I must implement this process into a shell script... Could you suggest a simple way to solve this little problem? Can I use the direction of the vectors to solve this problem? Many thanks Ivan -- Ti prego di cercare di non inviarmi files .dwg, .doc, .xls, .ppt. Preferisco formati liberi. Please try to avoid to send me .dwg, .doc, .xls, .ppt files. I prefer free formats. http://it.wikipedia.org/wiki/Formato_aperto http://en.wikipedia.org/wiki/Open_format Ivan Marchesini Department of Civil and Environmental Engineering University of Perugia Via G. Duranti 93/a 06125 Perugia (Italy) Socio fondatore GFOSS "Geospatial Free and Open Source Software" http://www.gfoss.it e-mail: [EMAIL PROTECTED] [EMAIL PROTECTED] tel: +39(0)755853760 fax (university): +39(0)755853756 fax (home): +39(0)5782830887 jabber: [EMAIL PROTECTED] _______________________________________________ grass-user mailing list grass-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/grass-user