/*
???? * 計算兩個經緯度之間的距離
???? * guoqing 2010-9-2
???? */
??? private const double EARTH_RADIUS = 6378.137;
??? private static double rad(double d)
??? {
??????? return d * Math.PI / 180.0;
??? }
??? //double dis = Function.GetDistance(38.03430117880767, 114.43754196166992, 38.03619406237629, 114.57710266113281);//東二環到西二環
??? public static double GetDistance(double lat1, double lng1, double lat2, double lng2)
??? {
??????? double radLat1 = rad(lat1);
??????? double radLat2 = rad(lat2);
??????? double a = radLat1 - radLat2;
??????? double b = rad(lng1) - rad(lng2);
??????? double s = 2 * Math.Asin(Math.Sqrt(Math.Pow(Math.Sin(a / 2), 2) +
???????? Math.Cos(radLat1) * Math.Cos(radLat2) * Math.Pow(Math.Sin(b / 2), 2)));
??????? s = s * EARTH_RADIUS;
??????? s = Math.Round(s * 10000) / 10000;
??????? return s;
??? }

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