c# - C#中2个纬度/经度点之间的方向

Question

我有 2 个 Lat Long 格式的坐标。

如何确定从 A 点(例如纽约 37.149472,-95.509544)到 B 点(例如多伦多 40.714269,-74.005973)的方向

我正在寻找像“340 度”这样的值

在 C# 中

Answer 1

如果你想要一个恒定的方位跟随你不想要最短的(大圆)路径你想要一条 Rhumb 线

Movable Type 脚本的转换

static double DegreeBearing(
    double lat1, double lon1, 
    double lat2, double lon2)
{   
    var dLon = ToRad(lon2-lon1);
    var dPhi = Math.Log(
        Math.Tan(ToRad(lat2)/2+Math.PI/4)/Math.Tan(ToRad(lat1)/2+Math.PI/4));
    if (Math.Abs(dLon) > Math.PI) 
        dLon = dLon > 0 ? -(2*Math.PI-dLon) : (2*Math.PI+dLon);
    return ToBearing(Math.Atan2(dLon, dPhi));
}

public static double ToRad(double degrees)
{
    return degrees * (Math.PI / 180);
}

public static double ToDegrees(double radians)
{
    return radians * 180 / Math.PI;
}

public static double ToBearing(double radians) 
{  
    // convert radians to degrees (as bearing: 0...360)
    return (ToDegrees(radians) +360) % 360;
}

// verify against the website example
DegreeBearing(50.36389,-4.15694,42.35111,-71.04083);