NAD83CORS96

NAD83CORS96 is a realization of the North American Datum 83 (NAD83) that was produced from observations of the Continuously Operating Reference Stations (CORS) network and published in 1996. It represents NAD83 as realized through a network-based adjustment using GPS data collected across North America. The coordinates are tied to the GRS80 ellipsoid and are intended to provide a consistent geodetic framework for surveying, mapping, and geographic information systems in the region.

Technically, NAD83CORS96 serves as a common reference frame for control networks in the United States and Canada. Coordinates published under this realization are typically provided in geodetic latitude and longitude and height on the ellipsoid, and may also be available in Cartesian XYZ form. The CORS-based adjustment improves consistency of positions across large areas by incorporating many reference stations, aiding in transformations between NAD83 realizations and other geodetic systems.

Over time, several newer realizations of NAD83 have been introduced, but NAD83CORS96 remains relevant for historical datasets and for understanding the evolution of North American geodetic positioning. The U.S. National Geodetic Survey (NGS) maintains documentation and data sheets for the CORS network, including information on how NAD83CORS96 coordinates relate to other NAD83 realizations and to older systems such as NAD27.