我想要计算两个地理点的距离.点在经度和纬度上给出.
坐标为：
点1：36.578581,-118.291994
point 2：36.23998,-116.83171
这里有一个比较网站的结果：
http://www.movable-type.co.uk/scripts/latlong.html
这里是我从这个链接使用的代码：
Calculate distance between two points in google maps V3
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));
问题是我得到两个不同的结果.
我的结果：163,307公里
网站结果：136公里
有什么建议么？？？
TORTI
解决方法
你的公式几乎是正确的,但你必须交换经度的参数为纬度
Console.WriteLine(DistanceAlgorithm.DistanceBetweenPlaces(-118.291994,36.578581,-116.83171,36.23998)); // = 136 km
我使用简化的公式：
// cos(d) = sin(φА)·sin(φB) + cos(φА)·cos(φB)·cos(λА − λB),// where φА,φB are latitudes and λА,λB are longitudes
// Distance = d * R
public static double DistanceBetweenPlaces(double lon1,double lat2)
{
double R = 6371; // km
double sLat1 = Math.Sin(Radians(lat1));
double sLat2 = Math.Sin(Radians(lat2));
double cLat1 = Math.Cos(Radians(lat1));
double cLat2 = Math.Cos(Radians(lat2));
double cLon = Math.Cos(Radians(lon1) - Radians(lon2));
double cosD = sLat1*sLat2 + cLat1*cLat2*cLon;
double d = Math.Acos(cosD);
double dist = R * d;
return dist;
}
测试：
(赤道距离)：长0,100;纬度= 0,0; DistanceBetweenPlaces(0,100,0)= 11119.5公里
(北极距离)：长0,100;纬度= 90,90; DistanceBetweenPlaces(0,90,90)= 0 km
长期：-118.291994,-116.83171;纬度：36.578581,36.23998 = 135.6公里
长期：36.578581,36.23998;纬度：-118.291994,-116.83171 = 163.2公里
最好的祝福
附：在web site,您可以使用结果比较,每个点第一个文本框是纬度,第二个经度
