C# 已知经纬度计算两点距离函数

c# 已知经纬度计算两点距离函数

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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