| NAD83CSRS: | North American Datum 1983 Canadian Spatial Reference System. An adjustment of the Canadian Base Network and high order GPS tied to the Canadian Active Control System (CACS). Reference ellipsoid is GRS80. These coordinates may not be compatible with NAD83 public values. |
| NAD83: | North American Datum 1983. (Public horizontal reference system). The horizontal control datum for the U.S., Canada, Mexico and Central America, based on the geocentric reference ellipsoid Geodetic Reference System 1980 (GRS80). |
| NAD27: | North American Datum 1927. A non-geocentric horizontal control datum for the U.S., Canada and Mexico, defined by a coordinate and azimuth with origin at Meades Ranch, on the Clarke 1866 reference ellipsoid. |
| CGVD28: | Canadian Geodetic Vertical Datum 1928, mean sea level. (Adopted, public vertical reference system.). The average height of the surface of the sea for all stages of the tide. Usually determined by averaging height readings observed hourly over a minimum period of 19 years. |