001/**
002 * Copyright (c) 2011, The University of Southampton and the individual contributors.
003 * All rights reserved.
004 *
005 * Redistribution and use in source and binary forms, with or without modification,
006 * are permitted provided that the following conditions are met:
007 *
008 *   *  Redistributions of source code must retain the above copyright notice,
009 *      this list of conditions and the following disclaimer.
010 *
011 *   *  Redistributions in binary form must reproduce the above copyright notice,
012 *      this list of conditions and the following disclaimer in the documentation
013 *      and/or other materials provided with the distribution.
014 *
015 *   *  Neither the name of the University of Southampton nor the names of its
016 *      contributors may be used to endorse or promote products derived from this
017 *      software without specific prior written permission.
018 *
019 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
020 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
021 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
022 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
023 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
024 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
025 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
026 * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
027 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
028 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
029 */
030package org.openimaj.demos.mediaeval13.placing;
031
032/**
033 * A geolocation consisting of a latitude and longitude
034 * 
035 * @author Jonathon Hare (jsh2@ecs.soton.ac.uk)
036 * 
037 */
038public class GeoLocation {
039        public static final double EARTH_RADIUS_KM = 6371;// In kilometers
040
041        /**
042         * The latitude
043         */
044        public double latitude;
045
046        /**
047         * The longitude
048         */
049        public double longitude;
050
051        public GeoLocation(double lat, double lng) {
052                this.latitude = lat;
053                this.longitude = lng;
054        }
055
056        /**
057         * Compute the haversine distance between two points on the Earth's surface
058         * in kilometers.
059         * 
060         * @param actual
061         * @return
062         */
063        public double haversine(GeoLocation actual) {
064                return haversine(this.latitude, this.longitude, actual.latitude, actual.longitude);
065        }
066
067        static double haversine(double lat1, double lon1, double lat2, double lon2) {
068                final double dLat = Math.toRadians(lat2 - lat1);
069                final double dLon = Math.toRadians(lon2 - lon1);
070                lat1 = Math.toRadians(lat1);
071                lat2 = Math.toRadians(lat2);
072
073                final double a = Math.sin(dLat / 2) * Math.sin(dLat / 2) + Math.sin(dLon / 2) * Math.sin(dLon / 2)
074                                * Math.cos(lat1) * Math.cos(lat2);
075                final double c = 2 * Math.asin(Math.sqrt(a));
076                return EARTH_RADIUS_KM * c;
077        }
078
079        @Override
080        public String toString() {
081                return latitude + " " + longitude;
082        }
083}