- CRS
- [GEOTOOLS:Coordinate Reference System]
Coordinate System which is related to the real world by a datum. NOTE For the Geodetic Datum and Vertical datum, it will be related to the Earth.
Main systems used in the world :

List of Coordinate Reference Systems
- Engineering Coordinate Reference System — i, j, k Cartesian coordinates
- Geocentric Coordinate Reference System — X, Y, Z Cartesian coordinates
- Geographic Coordinate Reference System