Package org.geotools.referencing.crs
Coordinate reference systems implementation.
An explanation for this package is provided in the OpenGIS® javadoc.
The remaining discussion on this page is specific to the Geotools implementation.
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
.

Class Summary 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.