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- Geodetic datums are used to precisely specify each location on Earth’s surface in latitude and longitude1. Examples of geodetic datums include2:
- WGS 84, 72, 66 and 60 of the World Geodetic System
- NAD83, the North American Datum which is very similar to WGS 84
- NAD27, the older North American Datum, of which NAD83 was basically a readjustment
- OSGB36 of the Ordnance Survey of Great Britain
- ETRS89, the European Datum, related to ITRS
- ED50, the older European Datum
- GDA94, the Australian Datum
Learn more:✕This summary was generated using AI based on multiple online sources. To view the original source information, use the "Learn more" links.When you combine these measurements, we arrive at a geodetic datum. Datums precisely specify each location on Earth’s surface in latitude and longitude. For example, NAD27, NAD83, and WGS84 are geodetic datums.gisgeography.com/geodetic-datums-nad27-nad83-…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
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Geodetic datum - Wikipedia
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; NAD27, the older North American Datum, of which NAD83 was basically a readjustment ; OSGB36 of the Ordnance Survey of Great Britain; ETRS89, the … 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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WEBWhen you combine these measurements, we arrive at a geodetic datum. Horizontal datums precisely specify each location on Earth’s surface in latitude and longitude or other coordinate systems. For instance, …
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