Hi Ivan, please see http://www.nabble.com/Streams-extraction-from-streams-map-td10267212.html#a10306465
Markus On Mon, Apr 21, 2008 at 8:58 AM, ivan marchesini <[EMAIL PROTECTED]> wrote: > 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 > -- Open Source Geospatial Foundation http://www.osgeo.org/ http://www.grassbook.org/ _______________________________________________ grass-user mailing list grass-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/grass-user