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The next regular update (WMM2025) will occur in December 2024.Įfforts to supplement the various national surveying systems began in the 19th century with F.R. WGS 84 currently uses the World Magnetic Model 2020. The deviations of the EGM96 geoid from the WGS 84 reference ellipsoid range from about −105 m to about +85 m. It is an improvement over the 1996 EGM96 model, which was in turn an improvement over the original WGS 84 geoid, referred to as EGM84.
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This geoid defines the nominal sea level surface by means of a spherical harmonics series of degree 2160.
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Ĭurrently, WGS 84 uses the Earth Gravitational Model 2008. This leads to several computed parameters such as the polar semi-minor axis b which equals a × (1 − f) = 6 356 752.3142 m, and the first eccentricity squared, e 2 = 6.694 379 990 14 ×10 −3. The angular velocity of the Earth is defined to be ω = 72.921 15 ×10 −6 rad/s. The refined value of the WGS 84 gravitational constant (mass of Earth's atmosphere included) is GM = 3 986 004.418 ×10 8 m 3/s 2. The WGS 84 datum surface is an oblate spheroid with equatorial radius a = 6 378 137 m at the equator and flattening f = 1/ 298.257 223 563. The WGS 84 meridian of zero longitude is the IERS Reference Meridian, 5.3 arc seconds or 102 metres (335 ft) east of the Greenwich meridian at the latitude of the Royal Observatory. The coordinate origin of WGS 84 is meant to be located at the Earth's center of mass the uncertainty is believed to be less than 2 cm. and this ellipsoid is located a standard horizontal datum, named urn:ogc:def:datum:EPSG::6326.a standard reference ellipsoid model, named urn:ogc:def:ellipsoid:EPSG::7030.WGS 84 is the reference coordinate system used by the Global Positioning System.Īs CRS standard, and expressing by URN, urn:ogc:def:crs:EPSG::4326, it is composed of:
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Earlier schemes included WGS 72, WGS 66, and WGS 60. The latest revision is WGS 84 (also known as WGS 1984, EPSG:4326), established and maintained by the United States National Geospatial-Intelligence Agency since 1984, and last revised in 2014. This standard includes the definition of the coordinate system's fundamental and derived constants, the ellipsoidal (normal) Earth Gravitational Model (EGM), a description of the associated World Magnetic Model (WMM), and a current list of local datum transformations. The World Geodetic System ( WGS) is a standard for use in cartography, geodesy, and satellite navigation including GPS.