[GRASS-user] SRTM r.watershed at multiple scales

[jencor808]

I've been having the same problem. I have seen figures illustrating the
issue in riparian areas, where the watersheds 'end', leaving holes where
perhaps very small watersheds should be delineated along rivers/streams
instead. Personally, I am having this issue along coastlines, but its the
same as in the riparian case. I can't even fill the holes with a tiny
threshold and I'm hesitant to make up my own watersheds at the coast.

Is there a way to provide a bounding line (ie. coastline) and wall-to-wall
watersheds at a given scale are delineated within that area?



On Wednesday, February 19, 2014, Thomas Adams-2 [via OSGeo.org] <
ml-node+s1560n5104742h59 at n6.nabble.com> 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 <[hidden email]<http://user/SendEmail.jtp?type=node&node=5104742&i=0>>
> 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
>>>> >><[hidden email]<http://user/SendEmail.jtp?type=node&node=5104742&i=1>>
>>>>  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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>
> --
> Thomas E Adams, III
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-- 
Jennifer M. Corcoran, PhD
NASA Postdoctoral Program Fellow
Jet Propulsion Laboratory
4800 Oak Grove Drive
La Cañada Flintridge, CA 91011
alt email: Jennifer.M.Corcoran at jpl.nasa.gov
website: www.jennifermcorcoran.com




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