[GRASS-user] Re: r.stream.extract with external flow accumulation maps

[jentjr]

I also tried that by first setting the region equal to the elevation map and
then using r.mapcalc to create a new accumulation map. Both the elevation
and accumulation maps have the same spatial extent and resolution, but I
still get the error.

I believe that the flow accumulation grid was produced using ArcHydro. I put
the link to the data set that I am using below if anyone wants to try it
out.

http://www.horizon-systems.com/nhdplus/HSC-wth21.php





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