[GRASS-user] selecting upstream river segments
neteler at osgeo.org
Tue Apr 22 04:08:20 EDT 2008
On Mon, Apr 21, 2008 at 8:58 AM, ivan marchesini <marchesini at unipg.it> wrote:
> Dear Grass users,
> I have a vector stream network map of a single basin (so only a stream
> 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
> 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.
> Ivan Marchesini
> Department of Civil and Environmental Engineering
> University of Perugia
> Via G. Duranti 93/a
> Perugia (Italy)
> Socio fondatore GFOSS "Geospatial Free and Open Source Software" http://www.gfoss.it
> e-mail: marchesini at unipg.it
> ivan.marchesini at gmail.com
> tel: +39(0)755853760
> fax (university): +39(0)755853756
> fax (home): +39(0)5782830887
> jabber: geoivan73 at jabber.org
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