Class  Description 

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

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

AbstractSingleCRS 
Abstract coordinate reference system, consisting of a single coordinate system and a single datum (as opposed to compound CRS).

DefaultCompoundCRS 
A coordinate reference system 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
coordinate reference system but is not a projected coordinate reference system.

DefaultEngineeringCRS 
A contextually local coordinate reference system.

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

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.

DefaultImageCRS 
An engineering coordinate reference system applied to locations in images.

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

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

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

AbstractCRS
is the base class for all
coordinate reference systems (CRS). CRS can have an arbitrary number of dimensions. Some are twodimensional
(e.g. GeographicCRS
and
ProjectedCRS
), while some others are onedimensional
(e.g. VerticalCRS
and
TemporalCRS
). Those simple coordinate systems can be
used as building blocks for more complex coordinate reference systems. For example, it is possible to construct
a threedimensional CRS with (latitude, longitude, time) with an aggregation
of GeographicCRS
and
TemporalCRS
. Such aggregations
are built with CompoundCRS
.
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