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  1. The geographic coordinate system ( GCS) is a spherical or ellipsoidal 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 of spatial reference systems that are in use, and forms the basis for most others.

  2. For it, the Earth is cut up into 180 circles, from the Equator at 0°. The poles are at 90°, the North Pole is at 90° N (orth), the South Pole is at 90° S (outh). Places with the same latitude are on a circle, around the Earth. The other concept is called longitude (Long, or the Greek symbol "lambda", ), sometimes referred to as "meridian".

  3. Geographic coordinate system, the spherical coordinates of latitude and longitude Projected coordinate systems, including thousands of cartesian coordinate systems, each based on a map projection to create a planar surface of the world or a region.

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    How to create a custom geographic coordinate system?

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    How did the geographic coordinate system originate?

    • in geodetic Coordinates and Map
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    History The invention of a geographic coordinate system is generally credited to Eratosthenes of Cyrene, who composed his now-lost Geography at the Library of Alexandria in the 3rd century BC. A century later, Hipparchus of Nicaea improved on this system by determining latitude from stellar measurements rather than solar altitude and determining lo...

    Geodetic datum fIn order to be unambiguous about the direction of "vertical" and the "horizontal" surface above which they are measuring, map-makers choose a reference ellipsoid with a given origin and orientation that best fits their need for the area to be mapped. They then choose the most appropriate mapping of the spherical coordinate system ont...

    Map projection … fTo establish the position of a geographic location on a map, a map projection is used to convert geodetic coordinates to plane coordinates on a map; it projects the datum ellipsoidal coordinates and height onto a flat surface of a map. The datum, along with a map projection applied to a grid of reference locations, establishes a gr...

    3D Cartesian coordinates Every point that is expressed in ellipsoidal coordinates can be expressed as an rectilinear x y z (Cartesian) coordinate. Cartesian coordinates simplify many mathematical calculations. The Cartesian fsystems of different datums are not equivalent. Earth-centered, Earth-fixed …

    See also Decimal degrees – Angular measurements, typically for latitude and longitude Geographical distance – Distance measured along the surface of the earth Geographic information system – System to capture, manage and present geographic data f Geo URI scheme ISO 6709, standard representation of geographic point location by coordinates Linear ref...

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  5. Geographic coordinate system - Wikipedia - Read online for free. ... Language. English (selected)

  6. Aug 05, 2021 · A geographic coordinate system is a coordinate system that enables every location on the Earth to be specified by a set of numbers or letters, or symbols.[n 1] The coordinates are often chosen such that one of the numbers represents vertical position, and two or three of the numbers represent horizontal position.

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