1 /**
2 * Copyright (c) 2011, The University of Southampton and the individual contributors.
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without modification,
6 * are permitted provided that the following conditions are met:
7 *
8 * * Redistributions of source code must retain the above copyright notice,
9 * this list of conditions and the following disclaimer.
10 *
11 * * Redistributions in binary form must reproduce the above copyright notice,
12 * this list of conditions and the following disclaimer in the documentation
13 * and/or other materials provided with the distribution.
14 *
15 * * Neither the name of the University of Southampton nor the names of its
16 * contributors may be used to endorse or promote products derived from this
17 * software without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
21 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
22 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
23 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
24 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
25 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
26 * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
27 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
28 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
29 */
30 package org.openimaj.demos.mediaeval13.placing;
31
32 /**
33 * A geolocation consisting of a latitude and longitude
34 *
35 * @author Jonathon Hare (jsh2@ecs.soton.ac.uk)
36 *
37 */
38 public class GeoLocation {
39 public static final double EARTH_RADIUS_KM = 6371;// In kilometers
40
41 /**
42 * The latitude
43 */
44 public double latitude;
45
46 /**
47 * The longitude
48 */
49 public double longitude;
50
51 public GeoLocation(double lat, double lng) {
52 this.latitude = lat;
53 this.longitude = lng;
54 }
55
56 /**
57 * Compute the haversine distance between two points on the Earth's surface
58 * in kilometers.
59 *
60 * @param actual
61 * @return
62 */
63 public double haversine(GeoLocation actual) {
64 return haversine(this.latitude, this.longitude, actual.latitude, actual.longitude);
65 }
66
67 static double haversine(double lat1, double lon1, double lat2, double lon2) {
68 final double dLat = Math.toRadians(lat2 - lat1);
69 final double dLon = Math.toRadians(lon2 - lon1);
70 lat1 = Math.toRadians(lat1);
71 lat2 = Math.toRadians(lat2);
72
73 final double a = Math.sin(dLat / 2) * Math.sin(dLat / 2) + Math.sin(dLon / 2) * Math.sin(dLon / 2)
74 * Math.cos(lat1) * Math.cos(lat2);
75 final double c = 2 * Math.asin(Math.sqrt(a));
76 return EARTH_RADIUS_KM * c;
77 }
78
79 @Override
80 public String toString() {
81 return latitude + " " + longitude;
82 }
83 }