Main.java Source code

Introduction

Here is the source code for Main.java

Source

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

public class Main {

    public static double distance(double lat1, double lon1, double lat2, double lon2) {
        if (lat1 == lat2 && lon1 == lon2) {
            return 0;
        }
        // haversine great circle distance approximation, returns meters
        double theta = lon1 - lon2;
        double dist = Math.sin(deg2rad(lat1)) * Math.sin(deg2rad(lat2))
                + Math.cos(deg2rad(lat1)) * Math.cos(deg2rad(lat2)) * Math.cos(deg2rad(theta));
        if (dist > 1) {
            return 0;
        }
        dist = Math.acos(dist);
        dist = rad2deg(dist);
        dist = dist * 60; // 60 nautical miles per degree of separation
        dist = dist * 1852; // 1852 meters per nautical mile
        return dist / 1000;
    }

    private static double deg2rad(double deg) {
        return (deg * Math.PI / 180.0);
    }

    private static double rad2deg(double rad) {
        return (rad * 180.0 / Math.PI);
    }
}