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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 refined value of the WGS 84 gravitational constant (mass of Earth's atmosphere included) is GM = 3.986 004 418 × 10 14 m 3 /s 2. The angular velocity of the Earth is defined to be ω = 72.921 15 × ...
The first EGM, EGM84, was defined as a part of WGS84 along with its reference ellipsoid. WGS84 combines the old GRS 80 with the then-latest data, namely available Doppler, satellite laser ranging, and Very Long Baseline Interferometry ( VLBI ) observations, and a new least squares method called collocation. [ 3 ]
EPSG:3857 - Web Mercator projection of WGS 84, used for display by many web-based mapping tools, including Google Maps and OpenStreetMap. EPSG:9989 - International Terrestrial Reference Frame 2020 (ITRF2020) for 3D coordinates (latitude, longitude, ellipsoidal height) with subcentimeter accuracy, used for monitoring continental drift among others.
Web Mercator, Google Web Mercator, Spherical Mercator, WGS 84 Web Mercator [1] or WGS 84/Pseudo-Mercator is a variant of the Mercator map projection and is the de facto standard for Web mapping applications. It rose to prominence when Google Maps adopted it in 2005. [2]
Specifics: topography layer(s), 1px= 930m (30"arch), World (landmass only), datum WGS 84. Files: on command, 1 tiles. Files: on command, 1 tiles. — ♣ Comment(s): While ETOPO have to be the whole earth, this once can be a selected area such as Spain, and thus 'may be' more convenient for country-size project.
The National Spatial Framework for India uses Datum WGS84 with a LCC projection and is a recommended NNRMS standard. Each state has its own set of reference parameters given in the standard. [ 8 ]
The following other wikis use this file: Usage on cs.wikipedia.org World Geodetic System; Usage on es.wikipedia.org Sistema Geodésico Mundial; Usage on fa.wikipedia.org
Date/Time Thumbnail Dimensions User Comment; current: 18:58, 26 September 2010: 1,425 × 1,000 (2.11 MB): Nilfanion {{Information |Description=Map of Kent, UK with the following information shown: *Administrative borders *Coastline, lakes and rivers *Roads and railways *Urban areas Equirectangular map projection on WGS 84 datum, with N/S stretched 160% Geo