Assuming we have a DEM -
1. Compute the the slope of the terrain
2. Generate polygons corresponding to specific ranges of slope, say
Poly 1 - < 20%
Poly 2 <40%
and so on
3. Generate contour layers
100' contours
50' contours that are not 100' contours
10' contours that are not 50' or 100' contours
4. Clip the 10' contour layer to the <20% layer
Clip the 50' contour layer to the <40% layer
and so on
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