001 /*
002 * GeoAPI - Java interfaces for OGC/ISO standards
003 * http://www.geoapi.org
004 *
005 * Copyright (C) 2004-2013 Open Geospatial Consortium, Inc.
006 * All Rights Reserved. http://www.opengeospatial.org/ogc/legal
007 *
008 * Permission to use, copy, and modify this software and its documentation, with
009 * or without modification, for any purpose and without fee or royalty is hereby
010 * granted, provided that you include the following on ALL copies of the software
011 * and documentation or portions thereof, including modifications, that you make:
012 *
013 * 1. The full text of this NOTICE in a location viewable to users of the
014 * redistributed or derivative work.
015 * 2. Notice of any changes or modifications to the OGC files, including the
016 * date changes were made.
017 *
018 * THIS SOFTWARE AND DOCUMENTATION IS PROVIDED "AS IS," AND COPYRIGHT HOLDERS MAKE
019 * NO REPRESENTATIONS OR WARRANTIES, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED
020 * TO, WARRANTIES OF MERCHANTABILITY OR FITNESS FOR ANY PARTICULAR PURPOSE OR THAT
021 * THE USE OF THE SOFTWARE OR DOCUMENTATION WILL NOT INFRINGE ANY THIRD PARTY
022 * PATENTS, COPYRIGHTS, TRADEMARKS OR OTHER RIGHTS.
023 *
024 * COPYRIGHT HOLDERS WILL NOT BE LIABLE FOR ANY DIRECT, INDIRECT, SPECIAL OR
025 * CONSEQUENTIAL DAMAGES ARISING OUT OF ANY USE OF THE SOFTWARE OR DOCUMENTATION.
026 *
027 * The name and trademarks of copyright holders may NOT be used in advertising or
028 * publicity pertaining to the software without specific, written prior permission.
029 * Title to copyright in this software and any associated documentation will at all
030 * times remain with copyright holders.
031 */
032 package org.opengis.referencing.crs;
033
034 import java.util.Map;
035 import org.opengis.referencing.cs.EllipsoidalCS;
036 import org.opengis.referencing.datum.GeodeticDatum;
037 import org.opengis.annotation.UML;
038
039 import static org.opengis.annotation.Obligation.*;
040 import static org.opengis.annotation.Specification.*;
041
042
043 /**
044 * A coordinate reference system based on an ellipsoidal approximation of the geoid; this provides
045 * an accurate representation of the geometry of geographic features for a large portion of the
046 * earth's surface.
047 *
048 * <p>A Geographic CRS is not suitable for mapmaking on a planar surface, because it describes geometry
049 * on a curved surface. It is impossible to represent such geometry in a Euclidean plane without
050 * introducing distortions. The need to control these distortions has given rise to the development
051 * of the science of {@linkplain org.opengis.referencing.operation.Projection map projections}.</p>
052 *
053 * <p>This type of CRS can be used with coordinate systems of type
054 * {@link org.opengis.referencing.cs.EllipsoidalCS}.</p>
055 *
056 * @departure historic
057 * This interface is kept conformant with the specification published in 2003.
058 * The 2007 revision of ISO 19111 removed the <code>GeographicCRS</code> and
059 * <code>GeocentricCRS</code> types, handling both using the <code>GeodeticCRS</code> parent type.
060 * GeoAPI keeps them since the distinction between those two types is in wide use.
061 *
062 * @author Martin Desruisseaux (IRD)
063 * @version 3.0
064 * @since 1.0
065 *
066 * @navassoc 1 - - GeodeticDatum
067 * @navassoc 1 - - EllipsoidalCS
068 *
069 * @see CRSAuthorityFactory#createGeographicCRS(String)
070 * @see CRSFactory#createGeographicCRS(Map, GeodeticDatum, EllipsoidalCS)
071 */
072 @UML(identifier="SC_GeographicCRS", specification=ISO_19111)
073 public interface GeographicCRS extends GeodeticCRS {
074 /**
075 * Returns the coordinate system, which must be ellipsoidal.
076 */
077 @Override
078 @UML(identifier="coordinateSystem", obligation=MANDATORY, specification=ISO_19111)
079 EllipsoidalCS getCoordinateSystem();
080 }