在C＃2纬度/经度点之间方向 [英] Direction between 2 Latitude/Longitude points in C#

问题描述

我在纬度长格式的2坐标。

I have 2 coordinates in Lat Long format.

我如何从A点（如纽约37.149472，-95.509544）以度到B点的方向确定（如多伦多40.714269，-74.005973）

How do I determine from Point A (eg New York 37.149472,-95.509544 ) the direction in degrees to point B (eg Toronto 40.714269,-74.005973)

我正在寻找像340度

值在C＃

推荐答案

如果你想有一个恒定的轴承跟着你不想让你想在最短的（大圈）路径恒向线

If you want a constant bearing to follow you don't want the shortest (great circle) path you want a Rhumb line

Movable Type的脚本为

Conversion of the Movable Type Scripts for that

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);

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