What is NAD83?
NAD83 – North American Datum 1983. The reference system adopted in 1986 by the U.S., Canada and Central America. It is based on the GRS80 (Geodetic Reference System 1980) ellipsoid. Although originally thought to be geocentric, it is now known to be offset from the true geocenter by about 2 m due to the limited accuracy of absolute positioning at the time. There is only one NAD83 datum and it is considered fixed to the North-American tectonic plate.
Related Questions
- If I only want to convert horizontal values (Latitude, Longitude to/from UTM or State Plane or between NAD27 and NAD83 datums) what version do I need to download?
- What is the coordinate collection method and date coordinate collected with a datum or NAD83,?
- What are NAD27, NAD83, GRS80, WGS84 Datum, and State Plane Coordinate System?
