Matches in DBpedia 2015-10 for { <http://dbpedia.org/resource/Geodetic_datum> ?p ?o }
- Geodetic_datum abstract "A Geodetic datum or geodetic system is a coordinate system, and a set of reference points, used to locate places on the Earth (or similar objects). An approximate definition of sea level is the datum WGS 84, an ellipsoid, whereas a more accurate definition is Earth Gravitational Model 2008 (EGM2008), using at least 2,159 spherical harmonics. Other datums are defined for other areas or at other times; ED50 was defined in 1950 over Europe and differs from WGS 84 by a few hundred meters depending on where in Europe you look. Mars has no oceans and so no sea level, but at least two martian datums have been used to locate places there.Datums are used in geodesy, navigation, and surveying by cartographers and satellite navigation systems to translate positions indicated on maps (paper or digital) to their real position on Earth. Each starts with an ellipsoid (stretched sphere), and then defines latitude, longitude and altitude coordinates. One or more locations on the Earth's surface is chosen as an anchor "base-point".The difference in co-ordinates between datums is commonly referred to as datum shift. The datum shift between two particular datums can vary from one place to another within one country or region, and can be anything from zero to hundreds of meters (or several kilometers for some remote islands). The North Pole, South Pole and Equator will be in different positions on different datums, so True North will be slightly different. Different datums use different interpolations for the precise shape and size of the Earth (reference ellipsoids).Because the Earth is an imperfect ellipsoid, localised datums can give a more accurate representation of the area of coverage than WGS 84. OSGB36, for example, is a better approximation to the geoid covering the British Isles than the global WGS 84 ellipsoid. However, as the benefits of a global system outweigh the greater accuracy, the global WGS 84 datum is becoming increasingly adopted.Horizontal datums are used for describing a point on the Earth's surface, in latitude and longitude or another coordinate system. Vertical datums measure elevations or depths.In engineering and drafting, a datum is a reference point, surface, or axis on an object against which measurements are made.".
- Geodetic_datum thumbnail Chicago_City_Datum.jpg?width=300.
- Geodetic_datum wikiPageExternalLink www.ngs.noaa.gov.
- Geodetic_datum wikiPageExternalLink www.ordnancesurvey.co.uk.
- Geodetic_datum wikiPageExternalLink convert-datum.
- Geodetic_datum wikiPageExternalLink tr8350_2.html.
- Geodetic_datum wikiPageExternalLink geographiclib.sourceforge.net.
- Geodetic_datum wikiPageExternalLink kartoweb.itc.nl.
- Geodetic_datum wikiPageExternalLink body.htm.
- Geodetic_datum wikiPageExternalLink datum.html.
- Geodetic_datum wikiPageExternalLink elist.html.
- Geodetic_datum wikiPageExternalLink gps_f.html.
- Geodetic_datum wikiPageExternalLink index.html.
- Geodetic_datum wikiPageExternalLink 15285-geodetic-toolbox.
- Geodetic_datum wikiPageExternalLink Nadcon.html.
- Geodetic_datum wikiPageExternalLink WhatDatum.
- Geodetic_datum wikiPageExternalLink www.ordsvy.gov.uk.
- Geodetic_datum wikiPageExternalLink index.htm.
- Geodetic_datum wikiPageID "995417".
- Geodetic_datum wikiPageLength "21000".
- Geodetic_datum wikiPageOutDegree "104".
- Geodetic_datum wikiPageRevisionID "678177646".
- Geodetic_datum wikiPageWikiLink Altitude.
- Geodetic_datum wikiPageWikiLink Axes_conventions.
- Geodetic_datum wikiPageWikiLink Canada.
- Geodetic_datum wikiPageWikiLink Cartographer.
- Geodetic_datum wikiPageWikiLink Cartography.
- Geodetic_datum wikiPageWikiLink Category:Cartography.
- Geodetic_datum wikiPageWikiLink Category:Coordinate_systems.
- Geodetic_datum wikiPageWikiLink Category:Geodesic_datums.
- Geodetic_datum wikiPageWikiLink Category:Geodesy.
- Geodetic_datum wikiPageWikiLink Category:Global_Positioning_System.
- Geodetic_datum wikiPageWikiLink Category:Navigation.
- Geodetic_datum wikiPageWikiLink Category:Surveying.
- Geodetic_datum wikiPageWikiLink Chart_datum.
- Geodetic_datum wikiPageWikiLink Coordinate_system.
- Geodetic_datum wikiPageWikiLink Cornwall.
- Geodetic_datum wikiPageWikiLink ECEF.
- Geodetic_datum wikiPageWikiLink ED50.
- Geodetic_datum wikiPageWikiLink ETRS89.
- Geodetic_datum wikiPageWikiLink Earth.
- Geodetic_datum wikiPageWikiLink Elevation.
- Geodetic_datum wikiPageWikiLink Ellipsoid.
- Geodetic_datum wikiPageWikiLink Engineering.
- Geodetic_datum wikiPageWikiLink Engineering_drawing.
- Geodetic_datum wikiPageWikiLink Equator.
- Geodetic_datum wikiPageWikiLink European_Terrestrial_Reference_System_1989.
- Geodetic_datum wikiPageWikiLink Figure_of_the_Earth.
- Geodetic_datum wikiPageWikiLink GPS.
- Geodetic_datum wikiPageWikiLink GRS80.
- Geodetic_datum wikiPageWikiLink GRS_80.
- Geodetic_datum wikiPageWikiLink Geodesy.
- Geodetic_datum wikiPageWikiLink Geographic_coordinate_conversion.
- Geodetic_datum wikiPageWikiLink Geography_of_Mars.
- Geodetic_datum wikiPageWikiLink Geoid.
- Geodetic_datum wikiPageWikiLink Geologic_time_scale.
- Geodetic_datum wikiPageWikiLink Geological_time.
- Geodetic_datum wikiPageWikiLink Geometric_dimensioning_and_tolerancing.
- Geodetic_datum wikiPageWikiLink Global_Positioning_System.
- Geodetic_datum wikiPageWikiLink Great_Britain.
- Geodetic_datum wikiPageWikiLink Hong_Kong_Principal_Datum.
- Geodetic_datum wikiPageWikiLink International_Earth_Rotation_Service.
- Geodetic_datum wikiPageWikiLink International_Earth_Rotation_and_Reference_Systems_Service.
- Geodetic_datum wikiPageWikiLink International_Terrestrial_Reference_System.
- Geodetic_datum wikiPageWikiLink Latitude.
- Geodetic_datum wikiPageWikiLink Longitude.
- Geodetic_datum wikiPageWikiLink Map.
- Geodetic_datum wikiPageWikiLink Map_projection.
- Geodetic_datum wikiPageWikiLink Maps.
- Geodetic_datum wikiPageWikiLink Mars.
- Geodetic_datum wikiPageWikiLink Meades_Ranch,_Kansas.
- Geodetic_datum wikiPageWikiLink Meades_Ranch_Triangulation_Station.
- Geodetic_datum wikiPageWikiLink Mean_sea_level.
- Geodetic_datum wikiPageWikiLink Measurement.
- Geodetic_datum wikiPageWikiLink NAD27.
- Geodetic_datum wikiPageWikiLink NAD83.
- Geodetic_datum wikiPageWikiLink NAVD88.
- Geodetic_datum wikiPageWikiLink National_Geospatial-Intelligence_Agency.
- Geodetic_datum wikiPageWikiLink Nautical_chart.
- Geodetic_datum wikiPageWikiLink Nautical_charts.
- Geodetic_datum wikiPageWikiLink Navigation.
- Geodetic_datum wikiPageWikiLink Newlyn.
- Geodetic_datum wikiPageWikiLink Normal_(geometry).
- Geodetic_datum wikiPageWikiLink North_America.
- Geodetic_datum wikiPageWikiLink North_American_Datum.
- Geodetic_datum wikiPageWikiLink North_American_Vertical_Datum_of_1988.
- Geodetic_datum wikiPageWikiLink North_Pole.
- Geodetic_datum wikiPageWikiLink OSGB36.
- Geodetic_datum wikiPageWikiLink Ocean.
- Geodetic_datum wikiPageWikiLink Oceans.
- Geodetic_datum wikiPageWikiLink Ordnance_Datum.
- Geodetic_datum wikiPageWikiLink Ordnance_Survey.
- Geodetic_datum wikiPageWikiLink Ordnance_Survey_National_Grid.
- Geodetic_datum wikiPageWikiLink Ordnance_datum.
- Geodetic_datum wikiPageWikiLink Quebec.
- Geodetic_datum wikiPageWikiLink Reference_ellipsoid.
- Geodetic_datum wikiPageWikiLink Satellite_navigation.
- Geodetic_datum wikiPageWikiLink Satellite_navigation_system.
- Geodetic_datum wikiPageWikiLink Scuba_diving.
- Geodetic_datum wikiPageWikiLink Sea_level.