blob: 072f3d7a80aa8e4b79488650c2d1702ac02fbe1f (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
|
/*
* Copyright 2014 Anton Tananaev (anton.tananaev@gmail.com)
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.traccar.helper;
public class DistanceCalculator {
private static final double equatorialEarthRadius = 6378.1370D;
private static final double deg2rad = (Math.PI / 180);
public static double distance(double lat1, double lon1, double lat2, double lon2) {
double dlong = (lon2 - lon1) * deg2rad;
double dlat = (lat2 - lat1) * deg2rad;
double a = Math.pow(Math.sin(dlat / 2), 2) +
Math.cos(lat1 * deg2rad) * Math.cos(lat2 * deg2rad) * Math.pow(Math.sin(dlong / 2), 2);
double c = 2 * Math.atan2(Math.sqrt(a), Math.sqrt(1 - a));
double d = equatorialEarthRadius * c;
return d * 1000;
}
}
|
