/*
* GeoTools - The Open Source Java GIS Toolkit
* http://geotools.org
*
* (C) 2011, Open Source Geospatial Foundation (OSGeo)
* (C) 2003-2005, Open Geospatial Consortium Inc.
*
* All Rights Reserved. http://www.opengis.org/legal/
*/
package org.opengis.referencing.crs;
import org.opengis.referencing.cs.EllipsoidalCS;
import org.opengis.referencing.datum.GeodeticDatum;
import org.opengis.annotation.UML;
import static org.opengis.annotation.Obligation.*;
import static org.opengis.annotation.Specification.*;
/**
* 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.
* <P>
* 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 {@linkplain org.opengis.referencing.operation.Projection map projections}.
*
* <TABLE CELLPADDING='6' BORDER='1'>
* <TR BGCOLOR="#EEEEFF"><TH NOWRAP>Used with CS type(s)</TH></TR>
* <TR><TD>
* {@link org.opengis.referencing.cs.EllipsoidalCS Ellipsoidal}
* </TD></TR></TABLE>
*
*
* @source $URL: http://svn.osgeo.org/geotools/trunk/modules/library/opengis/src/main/java/org/opengis/referencing/crs/GeographicCRS.java $
* @version <A HREF="http://portal.opengeospatial.org/files/?artifact_id=6716">Abstract specification 2.0</A>
* @author Martin Desruisseaux (IRD)
* @since GeoAPI 1.0
*/
@UML(identifier="SC_GeographicCRS", specification=ISO_19111)
public interface GeographicCRS extends GeodeticCRS {
/**
* Returns the coordinate system, which must be ellipsoidal.
*/
@UML(identifier="usesCS", obligation=MANDATORY, specification=ISO_19111)
EllipsoidalCS getCoordinateSystem();
}