[GRASS-dev] GRASS r.neighbors

Dylan Beaudette dylan.beaudette at gmail.com
Mon Jul 21 14:01:09 EDT 2008


On Monday 21 July 2008, chris carleton wrote:
> I've encountered another challenge with GRASS that I need some expert
> advice with. I want to run a neighborhood analysis on a few DEMs, but the
> options in r.neighbors don't quite seem to suit my needs. I want an
> analysis that calculates the average difference between the central cell
> and its neighbors (using that average as the new cell cat value). The idea
> is that I'll end up with an approximation of terrain 'ruggedness' by
> looking at average differences in elevation within a given neighborhood.
> Any suggestions would be welcome.
>
> Chris
>
> _________________________________________________________________

how about standard deviation or variance? these would give you an idea of how 
homogeneous the elevation data are within each window: higher values in steep 
uplands, with lower values in the valleys.

Cheers,

Dylan

-- 
Dylan Beaudette
Soil Resource Laboratory
http://casoilresource.lawr.ucdavis.edu/
University of California at Davis
530.754.7341


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