Hi there -- what is the best/fastest way to generate 1) a flow
direction/accumulation model from a DEM, and then 2) accumulate values from
a DIFFERENT raster that correspond with the cell positions from the DEM --
basically I want to take a flow acc. model and apply it to a map of
per-pixel precipitation values to get a first-order estimate of per-pixel
water accumulation, assuming conductivity in all cells is the same.
--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@hotmail.com
Have you checked out the r.watershed module? The "flow" input to that
command allows you to set the "weight" of each cell exactly as you
describe. Unfortunately, this command is not designed for giant grids
the way r.terraflow is. I don't think that r.terraflow allows you to
change the weight of each cell though.
On 6/13/06, Jonathan Greenberg <jgreenberg@arc.nasa.gov> wrote:
Hi there -- what is the best/fastest way to generate 1) a flow
direction/accumulation model from a DEM, and then 2) accumulate values from
a DIFFERENT raster that correspond with the cell positions from the DEM --
basically I want to take a flow acc. model and apply it to a map of
per-pixel precipitation values to get a first-order estimate of per-pixel
water accumulation, assuming conductivity in all cells is the same.
--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@hotmail.com
--
David Finlayson