| dbo:abstract |
The Earth Gravitational Models (EGM) are a series of geopotential models of the Earth published by the National Geospatial-Intelligence Agency (NGA). They are used as the geoid reference in the World Geodetic System. The NGA provides the models in two formats: as the series of numerical coefficients to the spherical harmonics which define the model, or a dataset giving the geoid height at each coordinate at a given resolution. Three model versions have been published: EGM84 with n=m=180, EGM96 with n=m=360, and EGM2008 with n=m=2160. n and m are the degree and orders of harmonic coefficients; the higher they are, the more parameters the models have, and the more precise they are. EGM2008 also contains expansions to n=2190. Developmental versions of the EGM are referred to as Preliminary Gravitational Models (PGMs). Each version of EGM has its own EPSG code as a vertical datum. (en) EGM med tillägg av ett årtal är en allmänt använd förkortning av geoidmodeller som täcker hela jorden, och utläses Earth Gravitational Model eller Earth Geopotential Model. Ett exempel är EGM96. (sv) |
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wiki-commons:Special:FilePath/Earth_Gravitational_Model_1996.png?width=300 |
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https://geographiclib.sourceforge.io http://cddis.nasa.gov/926/egm96/egm96.html https://earth-info.nga.mil/index.php%3Fdir=wgs84&action=wgs84%23egm2008 https://geographiclib.sourceforge.io/cgi-bin/GeoidEval https://github.com/USNavalResearchLaboratory/TrackerComponentLibrary |
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dbt:Reflist dbt:Short_description |
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dbc:Geodesy |
| rdfs:comment |
EGM med tillägg av ett årtal är en allmänt använd förkortning av geoidmodeller som täcker hela jorden, och utläses Earth Gravitational Model eller Earth Geopotential Model. Ett exempel är EGM96. (sv) The Earth Gravitational Models (EGM) are a series of geopotential models of the Earth published by the National Geospatial-Intelligence Agency (NGA). They are used as the geoid reference in the World Geodetic System. The NGA provides the models in two formats: as the series of numerical coefficients to the spherical harmonics which define the model, or a dataset giving the geoid height at each coordinate at a given resolution. Each version of EGM has its own EPSG code as a vertical datum. (en) |
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Earth Gravitational Model (en) EGM (sv) |
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