class 
AbstractCRS 
Abstract coordinate reference system, usually defined by a coordinate system and a datum.

class 
AbstractDerivedCRS 
A coordinate reference system that is defined by its coordinate conversion from another coordinate reference system (not by a datum).

class 
AbstractSingleCRS 

class 
DefaultCompoundCRS 
A coordinate reference system describing the position of points through two or more independent
coordinate reference systems.

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.
