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. 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
