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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.
Español: Mapa mundial de migraciones humanas, con el polo norte como centro. Africa es el punto de partida, leyéndose desde la parte superior izquierda hasta América del Sur en el extremo derecho. Los patrones de migración estan basados en estudios del ADN mitocondrial (matrilinear). Los números representan miles de años.
Tool Type Metadata types Coordinate parameters Description Licensing GeoLocator (project page) : Google Maps based {{coord}}, {{location}}, {{location dec}}, microformats, custom editable template
The World Geodetic System (WGS) is a standard used in cartography, geodesy, and satellite navigation including GPS.The current version, WGS 84, defines an Earth-centered, Earth-fixed coordinate system and a geodetic datum, and also describes the associated Earth Gravitational Model (EGM) and World Magnetic Model (WMM).
The 1980 Geodetic Reference System (GRS 80) posited a 6 378 137 m semi-major axis and a 1 ⁄ 298.257222101 flattening. This system was adopted at the XVII General Assembly of the International Union of Geodesy and Geophysics in Canberra, Australia, 1979. The GRS 80 reference system was originally used by the World Geodetic System 1984 (WGS 84 ...
The Hereford Mappa Mundi, about 1300, Hereford Cathedral, England. A mappa mundi (Latin [ˈmappa ˈmʊndiː]; plural = mappae mundi; French: mappemonde; Middle English: mappemond) is any medieval European map of the world.
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The Fra Mauro Map of the world. The map depicts Asia, Africa and Europe, with South at the top.. The Fra Mauro map is a map of the world made around 1450 by the Italian cartographer Fra Mauro, which is “considered the greatest memorial of medieval cartography."