On Wed, 10 Feb 2010, Micha Silver wrote:
A quick tip regarding r.water.outlet (you may have noticed this already) The module creates a new raster covering the whole analysis region with two possible values: 1 for all cells draining into the outlet, and 0 everywhere else. If you do r.to.vect straightaway, you?l get a vector containing two polygons... I always run r.null setnull=0 on the r.water.outlet result first. This insures that r.to.vect leaves you with just the drainage area.
Micha, I'm under a deadline to finish the current project, and nothing seems to be working correctly for me. I just ran r.water.outlet using the drainage (aspect) map created by r.watershed. The output is a yellow rectangle that the legend tells me represents '0'; that is, there're no cells in the calculated basin. g.region -p reports: projection: 99 (Lambert Conformal Conic) zone: 0 datum: nad83 ellipsoid: grs80 north: 1334420 south: 1279150 west: 769190 east: 819260 nsres: 10 ewres: 10 rows: 5527 cols: 5007 cells: 27673689 The command line was: r.water.outlet drain=aber10m.drain basin=lockie e=795542.95 n=1308323.52 --o I can send copies of aber10m.drain and lockie. It makes no sense to me that such a simple run fails to define the partial drainage basin. Any help or ideas you offer will be much appreciated. Rich _______________________________________________ grass-user mailing list grass-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/grass-user
