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Geodetic coordinates; Geography (Ptolemy) Geohash; Geomagnetic latitude; German Naval Grid System; Global Area Reference System; Global Navigation Grid Code; Grid (spatial index) Projected coordinate system
A geographic coordinate system (GCS) is a spherical or geodetic coordinate system for measuring and communicating positions directly on the Earth as latitude and longitude. [1] It is the simplest, oldest and most widely used of the various spatial reference systems that are in use, and forms the basis for most others.
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 ...
