NAD83 – We’re Not in Kansas Anymore
North American Datum of 1983 (NAD83) is 2-meters from geocentric and uses thousands of monuments with triangulation to create a reference frame for Earth
Coordinate Systems
World Geodetic System (WGS84)
The World Geodetic System 1984 (WGS84) is a spatial reference system of GPS satellites with an error of less than 2 cm to the center of Earth.
NAD27 – Meade’s Ranch at the Center of It All
Meade’s Ranch was the focal point of the NAD27 with all positions relative to it. First-order triangulation was used with approximately 26,000 survey points
Datum Transformations – Converting Coordinates from NAD27 to NAD83
NAD27 and NAD83 may differ in tens of meters for horizontal accuracy on location. Datum transformations correct your data from one datum to another.