001/*
002 *    GeoAPI - Java interfaces for OGC/ISO standards
003 *    Copyright © 2009-2023 Open Geospatial Consortium, Inc.
004 *    http://www.geoapi.org
005 *
006 *    Licensed under the Apache License, Version 2.0 (the "License");
007 *    you may not use this file except in compliance with the License.
008 *    You may obtain a copy of the License at
009 *
010 *        http://www.apache.org/licenses/LICENSE-2.0
011 *
012 *    Unless required by applicable law or agreed to in writing, software
013 *    distributed under the License is distributed on an "AS IS" BASIS,
014 *    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
015 *    See the License for the specific language governing permissions and
016 *    limitations under the License.
017 */
018package org.opengis.metadata.spatial;
019
020import java.util.Collection;
021import java.util.Collections;
022
023import org.opengis.annotation.UML;
024import org.opengis.geometry.DirectPosition;
025import org.opengis.metadata.quality.Element;
026
027import static org.opengis.annotation.Obligation.*;
028import static org.opengis.annotation.Specification.*;
029
030
031/**
032 * Information on ground control point.
033 *
034 * @author  Cédric Briançon (Geomatys)
035 * @version 3.1
036 * @since   2.3
037 */
038@UML(identifier="MI_GCP", specification=ISO_19115_2)
039public interface GCP {
040    /**
041     * Geographic or map position of the control point, in either two or three dimensions.
042     *
043     * @return geographic or map position of the control point.
044     */
045    @UML(identifier="geographicCoordinates", obligation=MANDATORY, specification=ISO_19115_2)
046    DirectPosition getGeographicCoordinates();
047
048    /**
049     * Accuracy of a ground control point.
050     *
051     * @return accuracy of a ground control point.
052     */
053    @UML(identifier="accuracyReport", obligation=OPTIONAL, specification=ISO_19115_2)
054    default Collection<? extends Element> getAccuracyReports() {
055        return Collections.emptyList();
056    }
057}