| The Columbia Encyclopedia, Sixth Edition. 2001-07. |
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| elevation |
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| vertical distance from a datum plane, usually mean sea level to a point above the earth. Often used synonymously with altitude, elevation is the height on the earth’s surface and altitude, the height in space above the surface. The elevation of a feature is calculated through such surveying techniques as trigonometric triangulation and aerial photogrammetry. Elevation is represented by using contours of equal elevation lines, three-dimensional computer graphics representation, or molded three-dimensional plastic models. |
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| | | The Columbia Encyclopedia, Sixth Edition. Copyright © 2007 Columbia University Press. |
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