Jaime Palalane <mitasjp-re5jqeeqqe8avxtiumw...@public.gmane.org> writes:
> I am trying to use qGIS to characterize a hydrographic basin but I am > facing problems with the profile from line tool as it is giving an > unique altitude value for my rivers and lengths in grades. I would > like to have them in SI units. I would appreciate some tips in how to > solve this problem. You should project your raster first into something like UTM. > I am also trying to use the r.water.outlet command to define a basin > draining to a specific point of a stream in raster format but without > success Remember to project raster! > as it gives me back only one cell as the basin and not a combination > of cells which could form a real basin. You are off the stream. Make sure you place your outlet _exactly_ on the stream. You can use flow accumulation (AKA upslope contributing area) to manually position your outlet better. GRASS 7 has module to snap outlet to stream [1]. But even better approach is to use TauDEM via sextante [2]. You can easily snap your outlets to stream with it and more tools are at your disposal. > Any tutorial or video in how to use this command? [3] [1] http://svn.osgeo.org/grass/grass-addons/grass7/raster/r.stream.snap/ [2] http://hub.qgis.org/projects/sextante-taudem [3] http://hydrology.usu.edu/taudem/taudem5.0/documentation.html -- Mikhail _______________________________________________ Qgis-user mailing list Qgis-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/qgis-user