History of GIS
GIS Career

The Remarkable History of GIS

Maps help us get to places. They help us make decisions. Maps have changed how we think about location. But where did it begin? We study the history of 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

Maps & Cartography

World Geodetic System (WGS84)

The World Geodetic System 1984 (WGS84) is the spatial reference system of GPS satellites with an error of less than 2 centimeters to the center of Earth.