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.

Used with CS type(s)
Ellipsoidal

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.

Field Summary

Fields inherited from interface ReferenceSystem

DOMAIN_OF_VALIDITY_KEY, SCOPE_KEY

Fields inherited from interface IdentifiedObject

ALIAS_KEY, IDENTIFIERS_KEY, NAME_KEY, REMARKS_KEY

Method Summary

Modifier and Type	Method and Description
EllipsoidalCS	getCoordinateSystem() Returns the coordinate system, which must be ellipsoidal.

Methods inherited from interface GeodeticCRS

getDatum

Methods inherited from interface ReferenceSystem

getDomainOfValidity, getScope

Methods inherited from interface IdentifiedObject

getAlias, getIdentifiers, getName, getRemarks, toWKT

Method Detail

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.