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The difference in elevation between adjacent pairs of contour lines should always be the same. This difference is called the contour interval the contour interval for the Angel Island model is 100 feet.
The models seem to work best if you have 7 or 8 contour lines (equal 7 or 8 salad trays).
|Download the topographic map of Angel Island (pdf)|
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|U.S. Department of the Interior | U.S. Geological Survey|
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Page Last Modified: Friday, 18-Jan-2013 17:38:39 EST (alv)