1 North American Datum of 1927
2 North American Datum of 1983
3 Comparisons Between NAD-27 and NAD-83
4 External links
5 See also ...
North American Datum (NAD)
There are two phases of the North American Datum - NAD27 and NAD83 - one local the other geocentric. Local datum align a spheroid to closely fit the earth's surface in a particular area.
North American Datum
the initial point of this datum is located at Meades Ranch, Kansas.
North American Datum
Letters:
10 pt CAPS Univers Condensed Bold
Numbers:
10 pt Univers Condensed Bold ...
North American Datum 1983
NAPLPS
North American Presentation Level Protocol Syntax ...
North American Datum of 1927
The primary local horizontal geodetic datum and geographic coordinate system used to map the United States during the middle part of the twentieth century.
North American Datum Conversion (NGS)
NADEC
National Atlas Development Centre (Ghana) ...
NAD: North American Datum
NAPP: National Aerial Photography Program (NAPP)
NAVD: North American Vertical Datum ...
NAD83 (North American Datum of 1983) - The new datum that replaces NAD27 for national surveying and mapping programs in Canada, the United States and Mexico. NAD83 is redefined from NAD27 by using a new Earth-centered reference GRS80.
Notes on the North American Datum (NAD)
Early surveys were often based on a local datum or reference system usually determined by astronomic observations.
NAD - North American Datum: The official reference ellipsoid used for the primary geodetic network in North America.
Node: The beginning and ending locations of a line on a digital map.
For example, the North American Datum for 1983 (NAD83) is the datum for map projections and coordinates within the United States and throughout North America. DBI See DATABASE INTEGRATOR. DBMS See database management system.
The North American Datum of 1927 is defined by the latitude and longitude of an initial point (Meade's Ranch in Kansas), the direction of a line between this point and a specified second point, and two dimensions that define the spheroid.
They are cast to the Universal Transverse Mercator (UTM) projection system and are referenced to either the North American Datum (NAD) of 1927 (NAD27) or the NAD of 1983 (NAD83).
A given set of bits might mean a set of coordinates with respect to the North American Datum of 1927 (NAD 27) to one user, ...
For example the recent introduction of the North American Datum of 1983 (NAD83) as a replacement for the long-established North American Datum of 1927 (NAD27).
The USGS 1:100,000-scale maps met national map accuracy standards and use coordinates defined by the North American Datum, 1983.
Horizontal coordinates issued by the Division for horizontal networks are based on the North American Datum 1983 (NAD83) which was adopted in May, 1990 by the then Department of Energy Mines and Resources (EMR), ...
This developed out of and is essentially the same as the North American Datum of 1983 or NAD83, which in turn was an update of the North American Datum of 1927 or NAD27. Many USGS maps, including the 7.
NDVI = (IR - Red)/(IR + Red) North American Datum (NAD) Datums used as a basis for large scale mapping, particularly NAD27 and NAD83 Northings The y-coordinates in a plane-coordinate system; see eastings.
O ...
Redefinition of the North American reference datum involves the transformation of geographical coordinates from the former North American Datum 1927 (NAD27) (Clarke 1866 reference ellipsoid) to the North American Datum 1983 (NAD83) on the Geodetic ...
5 minute topographic maps still in circulation use the NAD-27 (North American Datum, 1927) referencing system based on the Clarke ellipsoid of 1866.
For data concerning North America, your choice is typically between the North American Datum (NAD) of 1927 or 1983. If you you think that your data was based on a map made before 1983, then pick NAD27. If not, choose NAD83.
The corresponding datum is the basis for a planar coordinate system. For example the North American Datum, NAD83 is the horizontal datum and North American Datum NAVD88 is the vertical datum for coordinates used in Delaware County's GIS.
Horizontal Datum: The two most common spheroidal reference surfaces in Canada used as a reference or base to accurately define horizontal positions (x,y or longitude, latitude) are the North American Datum of 1927 (NAD27) or the more recent and ...
The USNG lettering scheme is identical to the MGRS 100,000-meter grid lettering scheme for the North American Datum (NAD83).
2. Ensure that the Shapefile coordinate system is Geographic (decimal degree latitude/longitude) and the Datum is North American Datum (NAD 83). If your data are not Geographic NAD 83, contact your GIS Specialist for help in converting it.
[geodesy] A reference ellipsoid having a semimajor axis of approximately 6,378,206.4 meters and a flattening of 1/294.9786982. It is the basis for the North American Datum of 1927 (NAD27) and other datums.
In your Coordinate Systems folder go to Geographic Coordinate Systems > North America > North American Datum 1983.prj and Click OK.
...
The datum is the basis for a planar coordinate system. For example, the North American Datum for 1983 (NAD83) is the datum for map projections and coordinates within the United States and throughout North America.
The resulting North American Datum of 1983 (NAD83)and the slightly refined World Geodetic System (WGS84), from the U.S. Military in 1984, are internationally accepted as the geodetic reference system (GRS 80).
datum: A set of parameters and control points used to accurately define the three dimensional shape of the Earth. The corresponding datum is the basis for a planar coordinate system. For example the North American datum, ...
In this figure the North American datum is extrapolated to Europe. Even though the datum fits the geoid in the North American continent well, it does not fit the European geoid.
North American Datum p. 76 an adjustment of geodetic measurements that provides the horizontal reference for North America.
North American Datum, 1927 - NAD27 - works well in North America, but not in Europe). See Datum for more information. It has been suggested that this article or section be merged with Geodetic system. ...
Only adjusted positions on the North American datum of 1927 and NAD 1983 may be properly transformed into plane coordinates on a state system.
 See also: Datum, Coordinate, Geographic, Information, Map
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