[GRASS-user] surface roughness script

[Dylan Beaudette]

Great!

This looks extremely useful. 

PS: I was just reading one of your papers where you describe this method.

Cheers,

Dylan

On Wednesday 19 July 2006 14:32, Carlos "Guâno" Grohmann wrote:
> Dear list
>
> I have uploaded in the WIKI r.roughness, a script to calculate maps of
> surface roughness for a DEM.
>
> # MODULE:	r.roughness
> # AUTHOR(S):	Carlos H. Grohmann <carlos dot grohmann at gmail dot com >
> # PURPOSE:	Calculates surface roughness from DEMs. (uses r.surf.area)
> #		In this script surface roughness is used in the sense of
> #		Hobson (1972), who describes it as the ratio between surface
> #		(real) area and flat (plan) area of square cells; in this
> #		approach, flat surfaces would present values close to 1,
> #		whilst in irregular ones the ratio shows a curvilinear
> #		relationship which asymptotically approaches infinity as the
> #		real areas increases.
> #		Reference:
> #		Hobson, R.D., 1972. Surface roughness in topography:
> #		quantitative approach. In: Chorley, R.J. (ed) Spatial
> #		analysis in geomorphology. Methuer, London, p.225-245.
> #
> #		This script will create sub-regions with size defined by
> #		the option GRID. In each sub-region, the real and planar areas
> #		will be calculated by r.surf.area, and the results (points at
> #		the center of sub-regions) will be interpolated with v.surf.rst.
> #		The user also can set the tension and smooth parameters.
>
>
> All the best
>
> Carlos

-- 
Dylan Beaudette
Soils and Biogeochemistry Graduate Group
University of California at Davis
530.754.7341