[GRASSLIST:10617] ARC FLOWDIRECTION vs GRASS

[Jonathan Greenberg]

I'm trying to replicate preparation of data for the DHSVM hydro model in
GRASS following an AML script, and I'm a bit confused why every GRASS module
with flow direction computation produces a different output than the ARC one
-- they even differ between themselves (e.g. r.watershed and r.terraflow).
Does anyone know of a flow direction computation that produces the EXACT
same outputs as ARC?  I'm not "judging" which one is better, I'm just trying
to follow as closely as possible the first time around the "idealized"
algorithm.

--j

--

Jonathan A. Greenberg, PhD
NRC Research Associate
NASA Ames Research Center
MS 242-4
Moffett Field, CA 94035-1000
Phone: 415-794-5043
AIM: jgrn3007
MSN: jgrn3007 at hotmail.com