[GRASS-user] r.basin error

Margherita Di Leo diregola at gmail.com
Mon Oct 22 23:25:08 PDT 2018

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

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
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