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- In geodesy two types of datums must be considered: a horizontal datum which forms the basis for the computations of horizontal control surveys in which the curvature of the earth is considered, and a vertical datum to which elevations are referred.geodesy.noaa.gov/PUBS_LIB/Geodesy4Layman/TR80003B.HTM
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Geodetic datum - Wikipedia
A geodetic datum or geodetic system (also: geodetic reference datum, geodetic reference system, or geodetic reference frame) is a global datum reference or reference frame for precisely representing the position of locations on Earth or other planetary bodies by means of geodetic coordinates. Datums are … 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
In geodetic coordinates, Earth's surface is approximated by an ellipsoid, and locations near the surface are described in terms of geodetic latitude ($${\displaystyle \phi }$$ 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 … See more
Horizontal datum
The horizontal datum is the model used to measure positions on Earth. A specific point can have … See moreThe 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 … See more
Wikipedia text under CC-BY-SA license Geodetic Datums: NAD 27, NAD 83 and WGS84
WebMar 9, 2024 · Geodetic datums like the North American Datum 1983 (NAD83) form the basis of coordinates of all horizontal positions for …
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WebGeodetic Datums. Referenced Ellipsoid. GEOID. Horizontal Datum : NAD83 , NAD83 (1986) , NAD27. Vertical Datum. Ellipsoidal Datums: NAD83 (HARN) , NAD83 (CORSxx) , NAD83 (NSRSxx) , NAD83 …
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WebMar 10, 2024 · Horizontal datums precisely specify each location on Earth’s surface in latitude and longitude or other coordinate systems. For instance, NAD27, NAD83, and WGS84 are examples of geodetic datums. Using …
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