我想计算两个地理点之间的距离。这些点的经度和纬度已给出。
这些坐标分别是:
点1:36.578581,-118.291994
点2:36.23998,-116.83171
这里提供一个网站来比较结果:
http://www.movable-type.co.uk/scripts/latlong.html
以下是我从此链接中使用的代码:
const double PIx = Math.PI;
const double RADIO = 6378.16;
/// <summary>
/// Convert degrees to Radians
/// </summary>
/// <param name="x">Degrees</param>
/// <returns>The equivalent in radians</returns>
public static double Radians(double x)
{
return x * PIx / 180;
}
/// <summary>
/// Calculate the distance between two places.
/// </summary>
/// <param name="lon1"></param>
/// <param name="lat1"></param>
/// <param name="lon2"></param>
/// <param name="lat2"></param>
/// <returns></returns>
public static double DistanceBetweenPlaces(double lon1, double lat1, double lon2, double lat2)
{
double R = 6371; // km
double dLat = Radians(lat2 - lat1);
double dLon = Radians(lon2 - lon1);
lat1 = Radians(lat1);
lat2 = Radians(lat2);
double a = Math.Sin(dLat / 2) * Math.Sin(dLat / 2) + Math.Sin(dLon / 2) * Math.Sin(dLon / 2) * Math.Cos(lat1) * Math.Cos(lat2);
double c = 2 * Math.Atan2(Math.Sqrt(a), Math.Sqrt(1 - a));
double d = R * c;
return d;
}
Console.WriteLine(DistanceAlgorithm.DistanceBetweenPlaces(36.578581, -118.291994, 36.23998, -116.83171));
问题在于我得到了两个不同的结果。
我的结果:163,307公里
网站的结果:136公里
有什么建议吗?
torti