I have a detailed 5m DEM for my study area. I want to find regions or zones where the slope or aspect (or preferably both) varies little. In other words, a nice evenly sloped hillside with a consistent aspect should show up high value, whereas complex, rugged terrain should show up as low. I want to identify these areas of smooth terrain, and preferably rank them by some kind of area. I guess that means I have to specify some kind of threshold or tolerance of values which I consider to be similar - I don't expect the slope or aspect to be exactly the same at any point, particularly not with floating point values.
What kind of filter do I need to pass over my data to identify these rough areas? I have spatial analyst and 3D analyst.
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