[GRASS-user] [GRASS-dev] Bugs in r.stream.extract

[Ken Mankoff]

On 2020-11-25 at 04:17 -08, ming han <dustming at gmail.com> wrote...
> And another problem I got is that the flow accumulation I got from
> r.accumulate and r.watershed is different when r.accumulate using flow
> direction from r.watershed. Again is there anyway r.watershed supports
> using flow direction, so we can get the consistent result.

There may be reasons for these differences? For example, if SFD v. MFD, or the "-a" flag to r.watershed?

> We need this when we need to adjust the flow direction from
> r.watershed or r.stream.extract. and then we need to determine new
> flow accumulation with an adjusted flow direction dataset. If the
> result is inconsistent, not sure what is the solution is.

It isn't clear why you are adjusting the flow direction. Is this required?

>> But, If I only want to use flow direction to drive streams, which
>> function I should use?

https://grass.osgeo.org/grass78/manuals/r.water.outlet.html but this only works for 1 outlet.

  -k.