C# 已知經緯度計算兩點距離函數

C# 已知經緯度計算兩點距離函數

public Task<double> GetDistance(double lat1, double lon1, double lat2, double lon2)        {            int R = 6371;            double rLat1 = ToRadian(lat1);            double rLat2 = ToRadian(lat2);            double dLat = rLat2 - rLat1;            double dLon = ToRadian(lon2 - lon1);            double a = Math.Pow(Math.Sin(dLat / 2), 2) +                Math.Pow(Math.Sin(dLon / 2), 2) *                Math.Cos(rLat1) * Math.Cos(rLat2);            double b = 2 * Math.Atan2(Math.Sqrt(a), Math.Sqrt(1 - a));            return Task.FromResult((R * b));        }

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