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Like Richard, I live and hike in a region with a substantial amount
of steep, cliffy terrain, so the bunching of contour lines serves a
useful purpose - "Stay away". That said, the Swiss maps suggest a
multi-step procedure.<br>
Assuming we have a DEM - <br>
1. Compute the the slope of the terrain<br>
2. Generate polygons corresponding to specific ranges of slope, say
<br>
Poly 1 - < 20% <br>
Poly 2 <40%<br>
and so on<br>
3. Generate contour layers<br>
100' contours<br>
50' contours that are not 100' contours<br>
10' contours that are not 50' or 100' contours<br>
4. Clip the 10' contour layer to the <20% layer<br>
Clip the 50' contour layer to the <40% layer<br>
and so on<br>
<br>
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