On Thu, Oct 13, 2011 at 9:04 AM, Francesco Mirabella <[email protected]>wrote:
> Hello, > and thanks for your fast replies, > yes, the final result which I'd like to get is a river profile along which > the values of the upslope contributing areas can be plotted on a separate y > axis. > In order to get this I suppose I should be able to "cat > river_long_profile_ascii | r.profile a_raster_map_containing_the > upslope_areas" which can provide values in square meters or square km or > whatever. > Do you know if such a raster map can be obtained from a dem? > Possibly r.flow could help here - in the manual: ################ There are three possible output maps which can be produced in any combination simultaneously: a vector map *flout* of flowlines, a raster map *lgout* of flowpath lengths, and a raster map *dsout* of flowline densities (which are equal upslope contributed areas per unit width, when multiplied by resolution). ################ If you need it more accurate, maybe use *r.drain for each cell and add* the flowpaths accordingly. Cheers, Rainer > > Francesco > > > > Rainer M Krug wrote: > >> It depends on what the OP was looking for - it sounds to me that he is >> looking for a kind of "dynamic" approach, where one can determine the >> upslope drainage area for an arbitrary location. Unfortunately, I don't have >> a solution, but would be quite interested in the answer. >> >> Cheers, >> >> Rainer >> >> On Thu, Oct 13, 2011 at 8:36 AM, Johannes Radinger <[email protected]<mailto: >> [email protected]>> wrote: >> >> Hello Francesco, >> >> you could use something like the AddOn r.stream.basin >> >> (http://grass.osgeo.org/wiki/**R.stream.*<http://grass.osgeo.org/wiki/R.stream.*> >> ) >> to delineate the basins. Every basin gets a unique number. >> Afterwards you can just query how >> many cells do have a certain number. >> >> best regards! >> Am 13.10.2011 <tel:13.10.2011> um 08:20 schrieb Francesco Mirabella: >> >> >> > Hi list, >> > does anyone know if there is a way to compute the upslope >> drainage contributing areas along a stream? >> > >> > thanks for your help! >> > Francesco >> > >> > >> > >> > >> > ______________________________**_________________ >> > grass-user mailing list >> > [email protected] >> <mailto:grass-user@lists.**osgeo.org<[email protected]> >> > >> >> > >> http://lists.osgeo.org/**mailman/listinfo/grass-user<http://lists.osgeo.org/mailman/listinfo/grass-user> >> >> ______________________________**_________________ >> grass-user mailing list >> [email protected] >> <mailto:grass-user@lists.**osgeo.org<[email protected]> >> > >> >> >> http://lists.osgeo.org/**mailman/listinfo/grass-user<http://lists.osgeo.org/mailman/listinfo/grass-user> >> >> >> >> >> -- >> Rainer M. Krug, PhD (Conservation Ecology, SUN), MSc (Conservation >> Biology, UCT), Dipl. Phys. (Germany) >> >> Centre of Excellence for Invasion Biology >> Stellenbosch University >> South Africa >> >> Tel : +33 - (0)9 53 10 27 44 >> Cell: +33 - (0)6 85 62 59 98 >> Fax (F): +33 - (0)9 58 10 27 44 >> >> Fax (D): +49 - (0)3 21 21 25 22 44 >> >> email: [email protected] <mailto:[email protected]> >> >> Skype: RMkrug >> >> -- Rainer M. Krug, PhD (Conservation Ecology, SUN), MSc (Conservation Biology, UCT), Dipl. Phys. (Germany) Centre of Excellence for Invasion Biology Stellenbosch University South Africa Tel : +33 - (0)9 53 10 27 44 Cell: +33 - (0)6 85 62 59 98 Fax (F): +33 - (0)9 58 10 27 44 Fax (D): +49 - (0)3 21 21 25 22 44 email: [email protected] Skype: RMkrug
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