001
014
015 package com.liferay.util;
016
017
020 public class Distance {
021
022 public static double calculate(double lat1, double lon1,
023 double lat2, double lon2) {
024
025
026
027 lat1 = (Math.PI * lat1) / 180;
028 lon1 = (Math.PI * lon1) / 180;
029 lat2 = (Math.PI * lat2) / 180;
030 lon2 = (Math.PI * lon2) / 180;
031
032 double miles =
033 3963.4 *
034 Math.acos(
035 (Math.sin(lat1) * Math.sin(lat2)) +
036 (Math.cos(lat1) * Math.cos(lat2) * Math.cos(lon1 - lon2)));
037
038 return miles;
039 }
040
041 public static double kmToMiles(double km) {
042 return km * 0.621;
043 }
044
045 public static double milesToKm(double miles) {
046 return miles / 0.621;
047 }
048
049 }