On Thu, Feb 20, 2014 at 8:25 PM, Stefan Lüdtke <[email protected]> wrote: > Hi, > I experienced a similar point, but, if I remember right, this was > because I set the computational region to the extend of the catchment > produced by r.water.outlet.
This is correct, r.watershed need a buffer of at least one cell around the catchment, otherwise it can not find out where exactly the catchment's borders are. Markus M So maybe the MASK has a similar effect and > r.watershed needs kind of buffer. Should be easy to check ... > > HTH, > > Stefan > > > > On 02/20/2014 07:11 PM, Michel Wortmann wrote: >> Here is what I think is strange though about your explanation, Markus: >> If I first mask a watershed produced with r.water.outlet and then use >> r.watershed to produce subbasins, it doesnt include the entire area of >> the watershed but leaves small areas out, although these areas belong to >> it. Is this a threshold problem? >> >> Tom, see image attached. >> >> Michel >> >> On 02/19/2014 04:42 PM, Thomas Adams wrote: >>> I've been using GRASS 7 for this and have not seen a problem -- I hope >>> I'm not overlooking the issue. Michel, can you provide an image that >>> shows this? >>> >>> Thanks, >>> Tom >>> >>> On Wednesday, February 19, 2014, Michel Wortmann >>> <[email protected] <mailto:[email protected]>> wrote: >>> >>> Markus, >>> last year you asked me whether the r.watershed output is not >>> aligned to the r.water.outlet output in GRASS7 (s.b.). Ie. it >>> leaves small areas out. Back then, I wasnt using GRASS7, but I can >>> confirm now that it still does it and it is still rather annoying. >>> Have you ever heard of the reasons or attempted to fix this? >>> Thanks, >>> Michel >>> >>> On 08/26/2013 03:25 PM, Markus Neteler wrote: >>> >>> On 08/22/2013 08:52 AM, Markus Neteler wrote: >>> >>> >> >>> >>Hi Michel, >>> >> >>> >>On Wed, Aug 21, 2013 at 1:18 PM, Michel Wortmann >>> >><[email protected]> wrote: >>> >>... >>> >>> >>> >>> >>>As the r.watershed algorithm often leaves small >>> areas at the edges >>> >>>uncovered, you'll have to fill those before or >>> after patching, otherwise >>> >>>you'll have holes in your subbasin map. >>> >>> >> >>> >>... just curious: does this happen still in the latest >>> GRASS 7 version? >>> >> >>> >>Markus >>> >>> >>> _______________________________________________ >>> grass-user mailing list >>> [email protected] >>> http://lists.osgeo.org/mailman/listinfo/grass-user >>> >>> >>> >>> -- >>> Thomas E Adams, III >>> 718 McBurney Drive >>> Lebanon, OH 45036 >>> >>> 1 (513) 739-9512 (cell) >>> >>> >> >> >> >> >> >> >> _______________________________________________ >> grass-user mailing list >> [email protected] >> 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: [email protected] > > 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 > _______________________________________________ > grass-user mailing list > [email protected] > http://lists.osgeo.org/mailman/listinfo/grass-user _______________________________________________ grass-user mailing list [email protected] http://lists.osgeo.org/mailman/listinfo/grass-user
