On Wed, Mar 2, 2016 at 8:42 PM, Janet Choate <jsc....@gmail.com> wrote: > Hi Will, > When running r.watershed on a small 35 hectare watershed, it produces a > fully connected stream network. However, when running r.watershed on a 6400 > hectare watershed, the stream network is not fully connected. > No preprocessing with regards to merging different raster maps, however, I > did try using r.fill.dir first to deal with any possible depressions that > might be causing non-connected stream segments.
Please note that r.watershed does not require filled depressions. If you want a properly connected stream network in vector format, use r.stream.extract. > thanks, > Janet > > On Wed, Mar 2, 2016 at 11:22 AM, Will Fields <will.openfie...@gmail.com> > wrote: >> >> Hi Janet, >> >> Can you give some more information about what you mean by larger watershed >> basins? Did you do any preprocessing of the elevation raster before you >> tried to extract the stream networks? Were you using an elevation raster >> that had been merged from different rasters? I've ran into issues in the >> past where "seams" along the original edges of a raster resulted in odd >> stream networks. >> >> Will >> >> On Wed, Mar 2, 2016 at 11:40 AM, Janet Choate <jsc....@gmail.com> wrote: >>> >>> Hi GRASS community, >>> When creating a stream network with r.watershed, I end up with some >>> isolated stream segments - particularly in larger watershed basins. Does >>> anyone know how to generate a stream network that is fully connected, or how >>> to correct this issue? >>> thank you, >>> Janet >>> >>> >>> >>> _______________________________________________ >>> grass-user mailing list >>> grass-user@lists.osgeo.org >>> http://lists.osgeo.org/mailman/listinfo/grass-user >> >> > > > > -- > Tague Team Lab Manager > 1005 Bren Hall > UCSB, Santa Barbara, CA. > > _______________________________________________ > grass-user mailing list > grass-user@lists.osgeo.org > http://lists.osgeo.org/mailman/listinfo/grass-user _______________________________________________ grass-user mailing list grass-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/grass-user