[GRASSLIST:5029] Re: surface roughness

[jprs]

> 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.

If I've understood your question...
I guess you'll have to divide by the cosin() of the slope,
but why don't you use the stdv or similar within a window?

Regards,
Juan