Thanks Markus and Stefan,
that did make a difference but I think it will always be a bit of a
gamble and a gap filling to match both the catchment with its subbasins
will always be needed.
R,
Michel
On 02/20/2014 10:09 PM, Markus Metz wrote:
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
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Stefan Lüdtke
Section 5.4- Hydrology
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Helmholtz-Zentrum Potsdam
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