[GRASS-user] r.basin error

Margherita Di Leo diregola at gmail.com
Tue Oct 23 03:29:20 PDT 2018


could you try if r73602 makes some difference?

On Tue, Oct 23, 2018 at 8:25 AM Margherita Di Leo <diregola at gmail.com>

> Hi Jose,
> Have you checked the cases where r.basin fails? Are they all cases of
> outlet falling in isolated pixels? R.basin can’t handle those, however it’s
> important to understand if there are other problems. Please check a sample
> of the failing cases. Try also to move the outlet of some pixels and run
> again. Note that it doesn’t handle overwrite, you have to delete the output
> manually.
> Hope this helps
> Il giorno lun 22 ott 2018 alle 21:30 pelempito <hoyodepelempito at yahoo.com>
> ha scritto:
>> Thanks Helmut for your reply.
>> Certainly having two areas is not a desirable result, but I am not sure if
>> there is a problem with the DEM. One of the areas encompasses an isolated
>> pixel, which in fact is the basin outlet. This polygon is connected
>> diagonally with the other one, which is the main area of the basin. Is it
>> an
>> issue of the DEM? The picture below shows the DEM cropped in the basin
>> area,
>> as well as the polygons and the main channel:
>> <http://osgeo-org.1560.x6.nabble.com/file/t368208/demcropped.jpg>
>> Many of my basins have an outlet such as the one described above. Should I
>> move the outlets to the main area? Such a solution would be a bit
>> impractical. However, some basin outlets may fall on an isolated pixel,
>> which may not be considered as an error.
>> --
>> Sent from: http://osgeo-org.1560.x6.nabble.com/Grass-Users-f3884509.html
>> _______________________________________________
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> --
> Margherita Di Leo

Margherita Di Leo
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