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copied!<p>An alternative way to accomplish the above,</p> <pre><code> public class Distance { public static double distance(double lat1, double lon1, double lat2, double lon2) { 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); } public static final double PI = 3.14159265; public static final double deg2radians = PI/180.0; public static double getDistance(double latitude1, double longitude1, double latitude2,double longitude2) { double lat1 = latitude1 * deg2radians; double lat2 = latitude2 * deg2radians; double lon1 = longitude1 * deg2radians; double lon2 = longitude2 * deg2radians; // Williams gives two formulae; // this is the more accurate for close distances. // In practice, the two differed only in the 8th or 9th place, for // separations as small as 1 degree. double radd = 2 * Math.asin(Math.sqrt(Math.pow(Math.sin((lat1 - lat2) / 2), 2.0) + Math.cos(lat1) * Math.cos(lat2) * Math.pow(Math.sin((lon1 - lon2) / 2), 2.0))); return radd; } /* ::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::: */ /* :: This function converts decimal degrees to radians : */ /* ::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::: */ private static double deg2rad(double deg) { return (deg * Math.PI / 180.0); } /* ::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::: */ /* :: This function converts radians to decimal degrees : */ /* ::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::: */ private static double rad2deg(double rad) { return (rad * 180.0 / Math.PI); } } </code></pre>

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