what is geodetic survey of canada datum
The North American Datum of 1983 (NAD 83) is the horizontal control datum for the United States, Canada, Mexico, and Central America, based on a geocentric origin and the Geodetic Reference System 1980.This datum, NAD 83, is the current geodetic reference system.he North American Datum of 1927 (NAD 27) is The horizontal control datum for the United States that (was) defined by (a) location and azimuth on the Clarke spheroid of 1866, with origin at (the survey station) Meades Ranch. ... The geoidal height at Meades Ranch (was) assumed to be zero.