c#-4.0 – 计算bing贴图中两点之间的距离

我有一张bing地图,还有两点：
Point1,Point2和我想计算这两点之间的距离？那可能吗？
如果我想在point1和point2之间以及point2附近的路径的三分之一处放一个圆圈……我怎么能做到？

解决方法

看 Haversine甚至更好的 Vincenty公式如何解决这个问题.

以下代码使用hasrsines方法来获取距离：

public double GetdistanceBetweenPoints(double lat1,double long1,double lat2,double long2)
    {
        double distance = 0;

        double dLat = (lat2 - lat1) / 180* Math.PI;
        double dLong = (long2 - long1) / 180 * Math.PI;

        double a = Math.Sin(dLat / 2) * Math.Sin(dLat / 2)
                    + Math.Cos(lat1 / 180* Math.PI) * Math.Cos(lat2 / 180* Math.PI) 
                    * Math.Sin(dLong/2) * Math.Sin(dLong/2);
        double c = 2 * Math.atan2(Math.Sqrt(a),Math.Sqrt(1 - a));

        //Calculate radius of earth
        // For this you can assume any of the two points.
        double radiusE = 6378135; // Equatorial radius,in metres
        double radiusP = 6356750; // Polar Radius

        //Numerator part of function
        double nr = Math.Pow(radiusE * radiusP * Math.Cos(lat1 / 180 * Math.PI),2);
        //Denominator part of the function
        double dr = Math.Pow(radiusE * Math.Cos(lat1 / 180 * Math.PI),2)
                        + Math.Pow(radiusP * Math.Sin(lat1 / 180 * Math.PI),2);
        double radius = Math.Sqrt(nr / dr);

        //Calculate distance in meters.
        distance = radius * c;
        return distance; // distance in meters
    }

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