A geographic coordinate system is a coordinate system that enables every location on the Earth to be specified by a set of numbers and/or letters. The coordinates are often chosen such that one of the numbers represents vertical position, and two or three of the numbers represent horizontal position. A common choice of coordinates is latitude, longitude and elevation.
Read more about Geographic Coordinate System: Geographic Latitude and Longitude, Latitude and Longitude in Practice, UTM and UPS Systems, Stereographic Coordinate System, Geodetic Height, Cartesian Coordinates, Shape of The Earth, Expressing Latitude and Longitude As Linear Units, Datums Often Encountered, Geostationary Coordinates, On Other Celestial Bodies
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