Datum Transformations: NAD27 Shift to NAD83
Maps & Cartography

Geodetic Datums: NAD 27, NAD 83 and WGS84

Ellipsoids, survey benchmarks and triangulation – these are the ingredients for geodetic datums. NAD27, NAD83 and WGS84 are common datums in North America.

Map Projections Example
Maps & Cartography

Map Projections: Flatten the Sphere

The best way to represent the Earth is with a globe. But map projections can be awfully useful too. Find out why cartographers use map projections in GIS.

National Geodetic Survey Explorer
Maps & Cartography

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