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Geodesy
Fundamentals
Geodesy
Geodynamics
Geomatics
History
Concepts
Geographical distance
Geoid
Figure of the Earth (radius and circumference)
Geodetic coordinates
Geodetic datum
Geodesic
Horizontal position representation
Latitude / Longitude
Map projection
Reference ellipsoid
Satellite geodesy
Spatial reference system
Spatial relations
Vertical positions
Technologies
Global Nav. Sat. Systems (GNSSs)
Global Pos. System (GPS)
GLONASS (Russia)
BeiDou (BDS) (China)
Galileo (Europe)
NAVIC (India)
Quasi-Zenith Sat. Sys. (QZSS) (Japan)
Discrete Global Grid and Geocoding
Standards (history)
NGVD 29
Sea Level Datum 1929
OSGB36
Ordnance Survey Great Britain 1936
SK-42
Systema Koordinat 1942 goda
ED50
European Datum 1950
SAD69
South American Datum 1969
GRS 80
Geodetic Reference System 1980
ISO 6709
Geographic point coord. 1983
NAD 83
North American Datum 1983
WGS 84
World Geodetic System 1984
NAVD 88
N. American Vertical Datum 1988
ETRS89
European Terrestrial Ref. Sys. 1989
GCJ-02
Chinese obfuscated datum 2002
Geo URI
Internet link to a point 2010
International Terrestrial Reference System
Spatial Reference System Identifier (SRID)
Universal Transverse Mercator (UTM)
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The North American Datum (NAD) is the horizontal datum now used to define the geodetic network in North America. A datum is a formal description of the shape of the Earth along with an "anchor" point for the coordinate system. In surveying, cartography, and land-use planning, two North American Datums are in use for making lateral or "horizontal" measurements: the North American Datum of 1927 (NAD 27) and the North American Datum of 1983 (NAD 83). Both are geodetic reference systems based on slightly different assumptions and measurements.
Vertical measurements, based on distances above or below Mean High Water (MHW), are calculated using the North American Vertical Datum of 1988 (NAVD 88).[1]
NAD 83, along with NAVD 88, is set to be replaced with a new GPS- and gravimetric geoid model-based geometric reference frame and geopotential datum, potentially in 2025.[2]
^North American Vertical Datum of 1988 (NAVD 88), at National Geodetic Survey
^New Datums: Replacing NAVD 88 and NAD 83
and 27 Related for: North American Datum information
The NorthAmericanDatum (NAD) is the horizontal datum now used to define the geodetic network in NorthAmerica. A datum is a formal description of the...
States of America based upon the General Adjustment of the NorthAmericanDatum of 1988. It superseded the National Geodetic Vertical Datum of 1929 (NGVD...
geodetic datum or geodetic system (also: geodetic reference datum, geodetic reference system, or geodetic reference frame) is a global datum reference...
the NorthAmerican Vertical Datum of 1988 (NAVD 88), based upon reference to a single benchmark (referenced to the new International Great Lakes Datum of...
The South AmericanDatum (SAD) is a regional historical geodetic datum for South America. The most common version was established in 1969 (SAD69), as adopted...
professionals include the National Geodetic Vertical Datum of 1929 and the NorthAmerican Vertical Datum of 1988. In common usage, elevations are often cited...
the large geodetic systems, such as European Datum (ED50), NorthAmericanDatum (NAD), and Tokyo Datum (TD), to provide a worldwide geo-data basis Need...
example, data in latitude/longitude if the datum is the NorthAmericanDatum of 1983 is denoted by 'GCS NorthAmerican 1983'. On the GRS 80 or WGS 84 spheroid...
ED50 ("European Datum 1950", EPSG:4230) is a geodetic datum which was defined after World War II for the international connection of geodetic networks...
Examples include the World Geodetic System and the 1927 and 1983 NorthAmericanDatum. A datum generally consists of an estimate of the shape of the Earth...
geodetic datum. In 1913, the datum was adopted across all of NorthAmerica, and the system revised and formalized as the NorthAmericanDatum of 1927 (NAD27)...
geodetic datum to be used for mapping and surveying purposes in Europe. It plays the same role for Europe as NAD-83 for NorthAmerica. (NAD-83 is a datum in...
referenced to the same geodetic datum. A geographic coordinate transformation is a translation among different geodetic datums. Both geographic coordinate...
from the geographical 49th parallel for the currently adopted datum, the NorthAmericanDatum of 1983 (NAD 83). The Digital Chart of the World (DCW), which...
Reference System (NSRS). It will replace the NorthAmericanDatum of 1983 (NAD 83) and the NorthAmerican Vertical Datum of 1988 (NAVD 88) with a new geometric...
Moscow. It is used in Australia for the Australian Geodetic Datum and in the South AmericanDatum 1969. The GRS-80 (Geodetic Reference System 1980) as approved...
(vertical). These regional geodetic datums, such as ED 50 (European Datum 1950) or NAD 27 (NorthAmericanDatum 1927), have ellipsoids associated with...
means current UTM northing at a given point can differ up to 200 meters from the old. For different geographic regions, other datum systems can be used...
is greater than that of the north, which is corroborated by the South Pole's sea level being lower than that of the north. A pear-shaped Earth had first...
Parameter Dataset (also EPSG registry) is a public registry of geodetic datums, spatial reference systems, Earth ellipsoids, coordinate transformations...
introduced in English-speaking countries, the basic geodetic datum in America was the NorthAmericanDatum of 1927 (NAD27). This had been constructed by triangulation...
is used for WGS84 and some other modern geodetic datums, the letter for the first row – just north of the equator – is A in odd-numbered zones, and F...
Geographic point coord. 1983 NAD 83 NorthAmericanDatum 1983 WGS 84 World Geodetic System 1984 NAVD 88 N. American Vertical Datum 1988 ETRS89 European Terrestrial...
was soon in practical use for longitude determination, especially in NorthAmerica, and over longer and longer distances as the telegraph network expanded...
Geographic point coord. 1983 NAD 83 NorthAmericanDatum 1983 WGS 84 World Geodetic System 1984 NAVD 88 N. American Vertical Datum 1988 ETRS89 European Terrestrial...
harmonics generated with better data. Deflection of the vertical Geodetic datum Geopotential International Terrestrial Reference Frame Physical geodesy...