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Is 80 feet some sort of standard?

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  • $\begingroup$ It does so in the United States, but not everywhere. For example, it uses 20 metre in Switzerland. $\endgroup$ – gerrit Aug 24 '15 at 15:59
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Based on USGS (Department of the Interior – United States Geological Survey) toopgraphic maps, where on a 7.5 min Quadrangle map, the contour interval is commonly 40 feet. Larger maps 15 min to 1'-2' maps the interval is commonly 80-100 feet.

All maps of the United States are commonly sourced from USGS based maps. I am certain Google or Google's map provider is using USGS base maps.

Reference: http://geology.isu.edu/geostac/Field_Exercise/topomaps/vert_scale.htm

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