I don't know if you have tried this yet, but you may also want to look at
r.terraflow. It does both D8 (single flow direction) and multiple flow
direction (flow is partitioned, according to the steepness of slope, to all
directions that are lower than the central cell). Supposedly you can also
switch from MFD to SFD once flow exceeds a threshold, but I have not been
successful at doing this. It would be a simple simulation of channelization
though.
Just set the D8 flag in the options tab, otherwise it will give you MFD by
default.
-Thayer
Date: Fri, 13 Feb 2015 11:12:30 -0700
From: Thomas Adams <[email protected]>
To: "[email protected]" <[email protected]>
Subject: [GRASS-user] Question about r.watershed and flow accumulation
grid
Message-ID:
<cagxgkwgefettcjzwki3jp8wj79eb0j3fzsf6hgzt8m9-dgc...@mail.gmail.com>
Content-Type: text/plain; charset="utf-8"
Hello all!
I'm making use of the flow accumulation grid in GRASS 6.4.5 generated from
r.watershed using the SFD (D8) flow algorithm. The DEM has a 250m spatial
resolution. What I'm getting is a break in the flow accumulation in a few
locations which is causing me serious problems with subsequent processing
(with help from some here, I have put together some scripting to generate a
pixel connectivity file for a distributed hydrologic model).
Besides going to a higher resolution DEM, are there any thoughts as to how
I can eliminate these flow accumulation breaks?
Thank you,
Tom
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