[GRASS-user] Reverse flow accumulation

[Michael Barton]

We've raised this question in my main research project as a way of
reconstructing past landscapes. So far, I haven't been able to decide how to
go about it.

Michael


On 4/5/07 10:28 AM, "Jonathan Greenberg" <greenberg at ucdavis.edu> wrote:

> Typically flow accumulation tracks the number of pixels that are uphill of a
> given pixel, but is there anyway to track the number of pixels that are
> DOWNHILL of a given pixel (e.g. to the drainage outlet)?  The reason I ask
> is that I'm dealing with a riparian bathymetry dataset which does not
> encompass the entire watershed although it does include the outlet as well
> as an unbroken, continuous distribution of values upstream from that point
> until it terminates at an arbitrary boundary, but I want to have a proxy of
> the flow to those points.  Uphill accumulation will not work because the
> "origin" of the streams is completely arbitrary (e.g. I can't just assign
> them a value of "0" at the edges).
> 
> Thoughts?
> 
> --j
> 
> --
> Jonathan A. Greenberg, PhD
> Postdoctoral Scholar
> Center for Spatial Technologies and Remote Sensing (CSTARS)
> University of California, Davis
> One Shields Avenue
> The Barn, Room 250N
> Davis, CA 95616
> Cell: 415-794-5043
> AIM: jgrn307
> MSN: jgrn307 at hotmail.com
> 
> 
> 
> 

__________________________________________
Michael Barton, Professor of Anthropology
School of Human Evolution & Social Change
Center for Social Dynamics & Complexity
Arizona State University

phone: 480-965-6213
fax: 480-965-7671
www: http://www.public.asu.edu/~cmbarton