| class  | AbstractDerivedCRS | A coordinate reference system that is defined by its coordinate conversion  from another
 coordinate reference system (not by a datum ). | 
| class  | DefaultDerivedCRS | A coordinate reference system that is defined by its coordinate conversion from another coordinate reference system
 but is not a projected coordinate reference system. | 
| class  | DefaultEngineeringCRS | A contextually local coordinate reference system. | 
| class  | DefaultGeocentricCRS | A 3D coordinate reference system with the origin at the approximate centre of mass of the earth. | 
| class  | DefaultGeographicCRS | A coordinate reference system based on an ellipsoidal approximation of the geoid; this provides an accurate
 representation of the geometry of geographic features for a large portion of the earth's surface. | 
| class  | DefaultImageCRS | An engineering coordinate reference system applied to locations in images. | 
| class  | DefaultProjectedCRS | A 2D coordinate reference system used to approximate the shape of the earth on a planar surface. | 
| class  | DefaultTemporalCRS | A 1D coordinate reference system used for the recording of time. | 
| class  | DefaultVerticalCRS | A 1D coordinate reference system used for recording heights or depths. |