[GRASS-user] Reverse flow accumulation

[Aurora Geomatics]

I am not sure if this will help your needs but, I have been recently  
testing LandSerf for raster analysis and have found it to have a rich  
set of Analysis and feature extraction tools. It also can import  
r.out.ascii and v.out.ascii files from GRASS.

http://www.soi.city.ac.uk/~jwo/landserf/landserf220/

At worse you may find some other very useful tools to use  
interchangeably with GRASS.

cheers.

Mars


On 6-Apr-07, at 8:35 AM, Michael Barton wrote:

> 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
>
>
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