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:
GeoAPI 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
 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.


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