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A good way to do this analysis would be create a TIN from your points then calculate the contours. You can do this in GIS software or even by hand.


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the difference between roughness and slope is a question of scale. I recommend that you think about the resolution of your raster at which you observe the slope but you don't see the roughness anymore, then you can smooth your surface (e.g. using a low pass, a mean filter or some spline) at this resolution. This will yield a new surface with zero roughness, ...



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