See: Description
Class  Description 

AbstractCRS 
Coordinate reference system, defined by a coordinate system
and (usually) a datum.

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

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

DefaultEngineeringCRS 
A 1, 2 or 3dimensional contextually local coordinate reference system.

DefaultGeocentricCRS 
A 3dimensional coordinate reference system with the origin at the approximate centre of mass of the earth.

DefaultGeographicCRS 
A 2 or 3dimensional coordinate reference system based on an ellipsoidal approximation of the geoid.

DefaultImageCRS 
A 2dimensional engineering coordinate reference system applied to locations in images.

DefaultParametricCRS 
A 1dimensional coordinate reference system which uses parameter values or functions.

DefaultProjectedCRS 
A 2dimensional coordinate reference system used to approximate the shape of the earth on a planar surface.

DefaultTemporalCRS 
A 1dimensional coordinate reference system used for the recording of time.

DefaultVerticalCRS 
A 1dimensional coordinate reference system used for recording heights or depths.

The root class for this package is AbstractCRS
.
Coordinate Reference System (CRS) can have various number of dimensions, but some restrictions
apply depending on the CRS type:
Dimension  CRS type examples  Remarks 

3  Geographic, Geocentric  ISO 19111 uses the same class, GeodeticCRS , for those two cases. 
2  Geographic, Projected  GeographicCRS can also be 3D. 
1  Vertical, Temporal.  
Any  Compound  Often used for adding a time axis to the above CRS. 
AbstractCRS.forConvention(AxesConvention)
DefaultTemporalCRS.toDate(double)
DefaultTemporalCRS.toValue(Date)
GeodeticCRS
type. OGC/ISO distinguishes the geographic/geocentric cases according the type
of the coordinate system associated to that CRS:
Defined in the sisreferencing
module
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