[GRASS-user] r.watershed: output basin map

[Margherita Di Leo]

On Thu, Apr 19, 2012 at 6:26 PM, Rich Shepard <rshepard at appl-ecosys.com>wrote:

> On Thu, 19 Apr 2012, Margherita Di Leo wrote:
>
>  You can query the white cells and discover that they are null values. This
>> is because r.watershed delineates only the basins that fall entirely into
>> the computational region.
>>
>
> madi,
>
>  I believe that the basin to the west of the large white one on the top
> also crosses the international boundary;


Actually, I fear that nature doesn't really care about politic boundaries
;-)


> I'll check.
>
>  You didn't provide information about any mask, ...
>>
>
>  No mask set.
>
>  ... consider to provide at least a small buffer along the ridge line in
>>
>> order to allow the algorithm to work properly.
>>
>
>  How do I do this?
>

Just enlarge the computational region sufficiently over the expected
boundary of the (sub)basin.

madi

>
> Thanks,
>
>
> Rich
>
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-- 
Ing. Margherita Di Leo, Ph.D.
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