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- Common geodetic datums include12:
- WGS 84 (World Geodetic System 1984)
- NAD83 (North American Datum 1983)
- NAD27 (North American Datum 1927)
- OSGB36 (Ordnance Survey of Great Britain 1936)
- ETRS89 (European Datum 1989)
- ED50 (European Datum 1950)
- GDA94 (Australian Datum 1994)
Learn more:✕This summary was generated using AI based on multiple online sources. To view the original source information, use the "Learn more" links.Examples of map datums are:
- WGS 84, 72, 66 and 60 of the World Geodetic System
- NAD83, the North American Datum which is very similar to WGS 84
en.wikipedia.org/wiki/Geodetic_datumThe three common datums in use in the Continental United States are:
- NAD 27 CONUS - North American Datum of 1927 for the Continental United States (Common on older USGS maps)
maptools.com/tutorials/map_datum - People also ask
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Geodetic datum - Wikipedia
A geodetic datum is a global or local reference frame for representing the position of locations on Earth. Learn about the concept, the history and the different types of geodetic datums, such as WGS 84, OSGB36 and NAD83. See more
A geodetic datum or geodetic system (also: geodetic reference datum, geodetic reference system, or geodetic reference frame, or terrestrial reference frame) is a global datum reference or reference frame for unambiguously … See more
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 … See more
The Earth's tectonic plates move relative to one another in different directions at speeds on the order of 50 to 100 mm (2.0 to 3.9 in) per year. Therefore, locations on different plates are in motion relative to one another. For example, the longitudinal difference between … See more
The spherical nature of Earth was known by the ancient Greeks, who also developed the concepts of latitude and longitude, and the first astronomical methods for … See more
Horizontal datum
A horizontal datum is a model used to precisely measure positions on Earth; it is thus a crucial component of any spatial reference system See moreIn geodetic coordinates, Earth's surface is approximated by an ellipsoid, and locations near the surface are described in terms of geodetic latitude ($${\displaystyle \phi }$$), longitude ($${\displaystyle \lambda }$$), and ellipsoidal height ($${\displaystyle h}$$ See more
A geodetic reference datum is a known and constant surface which is used to describe the location of unknown points on Earth. Since reference datums can have different radii and different center points, a specific point on Earth can have substantially … See more
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What are the two common datums used in the United States?
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