Wiki:Geographic coordinate system
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A geographic coordinate system is a coordinate system that enables every location on Earth to be specified by a set of numbers, letters or symbols.[note 1] The coordinates are often chosen such that one of the numbers represents a vertical position and two or three of the numbers represent a horizontal position; alternatively, a geographic position may be expressed in a combined three-dimensional Cartesian vector. A common choice of coordinates is latitude, longitude and elevation. To specify a location on a plane requires a map projection.