Android Distance Calculate distance(double lat1, double lon1, double lat2, double lon2, char unit)

Description

Calculates the distance between two geo-coordinates

License

Open Source License

Parameter

Parameter	Description
lat1	a parameter
lon1	a parameter
lat2	a parameter
lon2	a parameter
unit	a parameter

Return

distance between two geo coordinates

Declaration

public static double distance(double lat1, double lon1, double lat2,
        double lon2, char unit) 

Method Source Code

//package com.java2s;
//License from project: Open Source License 

public class Main {
    /**/*from  w  w  w .  jav  a2 s  . com*/
     * Calculates the distance between two geo-coordinates
     * 
     * @param lat1
     * @param lon1
     * @param lat2
     * @param lon2
     * @param unit
     * @return distance between two geo coordinates
     */
    public static double distance(double lat1, double lon1, double lat2,
            double lon2, char unit) {
        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));
        dist = Math.acos(dist);
        dist = rad2deg(dist);
        dist = dist * 60 * 1.1515;
        if (unit == 'K') {
            dist = dist * 1.609344;
        } else if (unit == 'N') {
            dist = dist * 0.8684;
        }
        return (dist);
    }

    /**
     * Converts degree to radian
     * 
     * @param deg
     * @return radian
     */
    private static double deg2rad(double deg) {
        return (deg * Math.PI / 180.0);
    }

    /**
     * Converts radian to degree
     * 
     * @param rad
     * @return degree
     */
    private static double rad2deg(double rad) {
        return (rad * 180 / Math.PI);
    }
}

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