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WGS84 is a geodetic coordinate system, the World Geodetic System 1984 (EPSG:4326).

Scope: Horizontal component of 3D system. Used by the GPS satellite navigation system and for NATO military geodetic surveying.

Definition: Well Known Text (WKT)

GEOGCS["WGS 84",
    DATUM["WGS_1984",
        SPHEROID["WGS 84",6378137,298.257223563,
            AUTHORITY["EPSG","7030"]],
        AUTHORITY["EPSG","6326"]],
    PRIMEM["Greenwich",0,
        AUTHORITY["EPSG","8901"]],
    UNIT["degree",0.0174532925199433,
        AUTHORITY["EPSG","9122"]],
    AUTHORITY["EPSG","4326"]]

Ref: http://epsg.io/4326

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