Terrain Characteristics
Ruggedness?
What happens when you take the slope of a slope map?
slope map,
and slope of the slope map?
What does that mean?
Here’s a better way to look at the second derivative of elevation. Use the Curvature command in ArcGIS (GUI, Geoprocessing Toolbox or Command line)..
 planform curvature |
 profile curvature |