Hi Janet, can you provide a screenshot of the river network, I think that helps to understand what is going on in your specific case?!
Cheers, Stefan On 02/03/16 20:42, Janet Choate 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. > thanks, > Janet > > On Wed, Mar 2, 2016 at 11:22 AM, Will Fields <will.openfie...@gmail.com > <mailto: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 > <mailto: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 <mailto: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 > -- Stefan Lüdtke Section 5.4- Hydrology Tel.: +49 331 288 2821 Fax: +49 331 288 1570 Email: slued...@gfz-potsdam.de Helmholtz-Zentrum Potsdam Deutsches GeoForschungsZentrum GFZ (GFZ German Research Centre for Geoscience) Stiftung des öff. Rechts Land Brandenburg Telegrafenberg, 14473 Potsdam ------------------- PGP Public Key: http://bit.ly/13d9Sca
signature.asc
Description: OpenPGP digital signature
_______________________________________________ grass-user mailing list grass-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/grass-user
