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}