The elevation of a geographic location is its height above or below a fixed reference point, most commonly a reference geoid, a mathematical model of the Earth's sea level as an equipotential gravitational surface.

In modern mapping, a topographic map is a type of map characterized by large-scale detail and quantitative representation of relief, using contour lines but, historically, using a variety of methods.

Added 9/9/2014 1:27:32 PM

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