[GRASS-user] Filling sinks w/ minimum slope

[Stefan Blumentrath]

Hi Ken,

To my knowledge r.watershed does not require to fill sinks in advance, because it has a minimal impact routing for handling (non-real) sinks.

Do you have a particular reason for your wish to fill the DEM in advance?

Cheers
Stefan

-----Original Message-----
From: grass-user [mailto:grass-user-bounces at lists.osgeo.org] On Behalf Of Ken Mankoff
Sent: mandag 19. juni 2017 18.36
To: GRASS user list <grass-user at lists.osgeo.org>
Subject: [GRASS-user] Filling sinks w/ minimum slope

Hi GRASS list,

I'm interested in filling sinks in a DEM before using r.watershed. I currently use r.fill.dir.

I've discovered that the SAGA fill command has an option to set a "Minimum slope gradient to preserve from cell to cell; with a value of zero sinks are filled up to the spill elevation (which results in flat areas)" (see http://www.saga-gis.org/saga_tool_doc/2.1.3/ta_preprocessor_4.html ).

Does anyone know of an option for this in GRASS, or an addon that implements this feature? I've briefly looked at calling SAGA from GRASS and it seems non-trivial. I'd prefer to do this in GRASS if possible.

Thanks,

  -k.
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