/*$************************************************************************************************
 **
 ** $Id: GeographicCRS.java 982 2007-03-27 10:54:51Z desruisseaux $
 **
 ** $URL: https://geoapi.svn.sourceforge.net/svnroot/geoapi/tags/2.1.0/geoapi/src/main/java/org/opengis/referencing/crs/GeographicCRS.java $
 **
 ** Copyright (C) 2003-2005 Open GIS 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>
 *
 * @version <A HREF="http://portal.opengeospatial.org/files/?artifact_id=6716">Abstract specification 2.0</A>
 * @author ISO/DIS 19111
 * @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();
}
