计算bing贴图中两点之间的距离

Question

我有一个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？

Answer 1

Microsoft有一个GeoCoordinate.GetDistanceTo方法,它使用Haversine公式.

对我来说,其他实现返回NaN的距离太小.我还没有遇到内置函数的任何问题.

Answer 2

看看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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