Re: Bugs in r.stream.extract

Hi Ken

   Many thanks for your reply, I think I made a mistake, the flow
accumulation I provided to r.stream.extract did not match the DEM I
provided in r.stream.extract.  The streamline seems based on flow
accumulation derived from the provided DEM.

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

   Is there any chance that  r.stream.extract can use flow direction as
inputs without DEM?

Thanks
Ming


Ken Mankoff <[email protected]> 于2020年11月24日周二 上午7:07写道：

> Hi Ming,
>
> On 2020-11-23 at 09:05 -08, ming han <[email protected]> wrote...
> > Hope this email finds you well. I got a weird result when using
> > r.stream.extract, as shown in the following figure. The back grids is
> > the flow accumulation layer with a flow accumulation threshold larger
> > than 1000. while the blue line is the stream generated by
> > r.stream.extract. Why the stream from r.stream.extract did not follow
> > flow accumulation results? And how to fix this problem?
>
> Is there any chance you can share the raster that includes this region so
> I can examine it? And the exact command you ran?
>
>   -k.
>
>

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