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What does NAD 83 stand for?

The North American Datum of 1983 (NAD 83) is the horizontal and geometric control datum for the United States, Canada, Mexico, and Central America. NAD 83 was released in 1986.

How large is the North American Datum (NAD) 27 to NAD 83 shift?

How large is the North American Datum (NAD) 27 to NAD 83 shift? Within the conterminous 48 states, the North American Datum of 1927 (NAD 27) to the North American Datum of 1983 (NAD 83) shift of the latitude/longitude graticule (lines showing parallels of latitude and meridians of longitude for the earth) is in the range of 10-100 ground meters.

What is the difference between NAD27 and NAD83 coordinates?

For example, State Plane coordinate systems can be referenced to either NAD83 and NAD27 geodetic datums. When you transform NAD83 and NAD27 geographic coordinates to projected State Plane coordinates, it is the same projection method. However, because the geodetic datums were different, the resulting projected coordinates will also be different.

Is NAD83 geocentric?

However, NAD83 is not geocentric with an offset of about two meters. North American Datum of 1983 is based on the reference ellipsoid GRS80 which is physically larger than NAD27’s Clarke ellipsoid. The GRS80 reference ellipsoid has a semi-major axis of 6,378,137.0 meters and a semi-minor axis of 6,356,752.3 meters.


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