计算bing贴图中两点之间的距离 [英] Calculate distance between two points in bing maps

问题描述

我有一个bing地图，和两个点：$ b​​ $ b 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之间的路径的三分之一和point2附近放一个圆...我怎么能做呢？

Ihave a bing map, and a two points : Point1,Point2 and i want to calculate the distance between these two points? is that possible? and if i want to put a circle on the two third of the path between point1 and point2 and near point2 ...how can i make it?

推荐答案

请参阅 Haversine 或更好的 Vincenty 公式如何解决这个问题。

See Haversine or even better the Vincenty formula how to solve this problem.

下面的代码使用haversines方式获取距离：

The following code uses haversines way to get the distance:

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
    }

您可以找到一个包含信息此处。

You can find a good site with infos here.

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