Java Distance Calculate calculateDistanceInKm(double lat1, double lon1, double lat2, double lon2)

Description

calculate Distance In Km

License

Apache License

Declaration

public static double calculateDistanceInKm(double lat1, double lon1, double lat2, double lon2) 

Method Source Code

//package com.java2s;
//License from project: Apache License 

public class Main {
    public static double calculateDistanceInKm(double lat1, double lon1, double lat2, double lon2) {
        int R = 6371; // Radius of the earth in km
        double dLat = deg2rad(lat2 - lat1); // deg2rad below
        double dLon = deg2rad(lon2 - lon1);
        double a = Math.sin(dLat / 2) * Math.sin(dLat / 2)
                + Math.cos(deg2rad(lat1)) * Math.cos(deg2rad(lat2)) * Math.sin(dLon / 2) * Math.sin(dLon / 2);
        double c = 2 * Math.atan2(Math.sqrt(a), Math.sqrt(1 - a));
        double d = R * c; // Distance in km
        return d;
    }//from   w  w w  . j  av a 2 s.c o m

    private static double deg2rad(double deg) {
        return deg * (Math.PI / 180);
    }
}

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