Geographic coordinate system - Video Learning - WizScience.com
How do geographical coordinates work?
Geographic Coordinate Systems - Geogrphic informations system ARCGIS - ESRI - GIS
Map Skills: Geography, Latitude and Longitude
Coordinate Systems: Latitude and Longitude
A geographic coordinate system is a coordinate system used in geography that enables every location on Earth to be specified by a set of numbers, letters or symbols. The coordinates are often chosen such that one of the numbers represents a vertical position, and two or three of the numbers represent a horizontal position. A common choice of coordinates is latitude, longitude and elevation.