Coordinate Reference System
A coordinate system that has its position, scale, and orientation defined with respect to an object. This is accomplished through a datum. For geospatial data this is usually the Earth.
Coordinate System
A set of rules that define how coordinates are assigned to points. Coordinates describing locations on Earth or another object are referenced to a Coordinate Reference System.
Geodetic Coordinate System
A coordinate reference system based on a geodetic datum.
Map Projection
A coordinate conversion from an ellipsoidal coordinate system to a plane.
Projected Coordinate Reference System
A Coordinate Reference System derived from a two dimensional geodetic coordinate reference system by applying a map projection.
Projection Parameters
Parameters defining a map projection.