[GRASSLIST:5018] Re: surface roughness

[Eric G. Miller]

On Wed, Nov 20, 2002 at 05:57:26PM -0200, Carlos Henrique Grohmann de Carvalho wrote:
> Does anyone know how I can make a surface roughness map?
>  
> the map is made by dividing the area into square inuts, and then calculating 
> the ratio beetwen the real area and the planar area of each cell.
>  
> the basic problem is how to calculate the real area of the surface in each 
> cell.

r.surf.area may be contain the basis for such a thing (it triangulates
surface area via adjacent cells).  It doesn't produce a raster though...

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