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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. A geographical coordinate system is a coordinate system. This means that every place can be specified by a set of three numbers, called coordinates. A full circle can be divided into 360 degrees (or 360°); this was first done by the Babylonians; Ancient Greeks, like Ptolemy later extended the theory. Today, degrees are divided further.

  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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  5. A geographic coordinate seestem is a coordinate seestem that enables ilka location on the Yird tae be specified bi a set o nummers or letters. The coordinates are aften chosen sae that ane o the nummers represents vertical poseetion, an twa or three o the nummers represent horizontal poseetion. A common choice o coordinates is latitude ...

    • in geodetic Coordinates and Map
    • Ptolemy's 2nd-century Geography Used The
    • Quito 111.3 Km 1.855 Km 30.92 M 11.13 M
    • Vertical Coordinates Include Height and
    • The Cartographic Coordinate Systems
    • Media Related to Geographic

    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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  6. A geographic coordinate system uses a three-dimensional spherical surface to determine locations on the earth. Any location on earth can be referenced by a point with longitude and latitude coordinates.

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