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  • Getting distance between two locations by lat/long

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    You will get distance between two location easily by using below code. You will just need lat/long of both location for which you have to calculate distance.

    /**
     * Get distance of location between two locations
     * @param lat2
     * @param lon2
     * @param unit represents the unit of distance
     * @return
     */
    public static double distance(double lat1, double lon1,double lat2, double lon2, String unit)
    {
    
        if(lat1 !=0)
        {
            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 Math.round(dist);
        }
        else
        {
            return 0;
        }
    }
    
    /**
     * This function converts decimal degrees to radians  
     * @param deg
     * @return
     */
    private static double deg2rad(double deg) {
        return (deg * Math.PI / 180.0);
    }
    
    
    /**
     * This function converts radians to decimal degrees   
     * @param rad
     * @return
     */
    private static double rad2deg(double rad) {
        return (rad * 180.0 / Math.PI);
    }
    

    Hope this will help you:)

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