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  1. 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. 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.

  2. Coordinate geografiche. Le linee verticali sono dette meridiani e servono a misurare la longitudine, le linee orizzontali sono dette paralleli e servono a misurare la latitudine. In geodesia le coordinate geografiche sono valori utili per individuare la posizione di un punto sulla superficie terrestre. Esse sono la latitudine, la ...

  3. The Earth-centered, Earth-fixed coordinate system (acronym ECEF ), also known as the geocentric coordinate system, is a cartesian spatial reference system that represents locations in the vicinity of the Earth (including its surface, interior, atmosphere, and surrounding outer space) as X, Y, and Z measurements from its center of mass.