org.opengis.referencing.crs
Interface GeographicCRS
- All Superinterfaces:
- CoordinateReferenceSystem, GeodeticCRS, IdentifiedObject, ReferenceSystem, SingleCRS
@UML(identifier="SC_GeographicCRS",
specification=ISO_19111)
public interface GeographicCRS
- extends GeodeticCRS
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.
A Geographic CRS is not suitable for mapmaking on a planar surface, because it describes geometry
on a curved surface. It is impossible to represent such geometry in a Euclidean plane without
introducing distortions. The need to control these distortions has given rise to the development
of the science of map projections.
- Since:
- 1.0
Departure from OGC/ISO specification:
This interface is kept conformant with the specification published in 2003.
The 2007 revision of ISO 19111 removed the GeographicCRS
and
GeocentricCRS
types, handling both using the GeodeticCRS
parent type.
GeoAPI keeps them since the distinction between those two types is in wide use.
getCoordinateSystem
@UML(identifier="coordinateSystem",
obligation=MANDATORY,
specification=ISO_19111)
EllipsoidalCS getCoordinateSystem()
- Returns the coordinate system, which must be ellipsoidal.
- Specified by:
getCoordinateSystem
in interface CoordinateReferenceSystem
- Specified by:
getCoordinateSystem
in interface SingleCRS
- Returns:
- The coordinate system.
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