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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.
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 Gall–Peters projection of the world map. The Gall–Peters projection is a rectangular, equal-area map projection.Like all equal-area projections, it distorts most shapes.
The Universal Transverse Mercator (UTM) is a map projection system for assigning coordinates to locations on the surface of the Earth.Like the traditional method of latitude and longitude, it is a horizontal position representation, which means it ignores altitude and treats the earth surface as a perfect ellipsoid.
Tool Type Metadata types Coordinate parameters Description Licensing GeoLocator (project page) : Google Maps based {{coord}}, {{location}}, {{location dec}}, microformats, custom editable template
Swinging glass doors are a better choice than the typical sliding glass doors, since they offer a much tighter seal, [7] but glass – even the best type of glass, chosen according to the climate zone – is always a poor insulator, making doors based on them a poor choice from a thermal comfort perspective.
Sliding doors are commonly found as store, hotel, and office entrances, used in elevators, and used as patio doors, closet doors and room dividers. [7] Sliding doors are also used in transportation, such as in vans and both overground and underground trains. Volkswagen used these doors in the Volkswagen Fridolin produced between 1964 and 1974.