兩個坐標之間的軸承中的輸出很奇怪

Question

我有一種方法可以用來計算兩個地理坐標之間的方位（示例格式為40.7486，-73.9864）。

但是，我遇到了一個問題，即它計算的標題與我使用經過測試和測試的應用程序計算的標題不同。

例如，以下兩個點之間的初始方位是074度，但是我的方法返回047。
40.7486, -73.9864
40.9486, -72.9866

這是相關的代碼段。

        /// <summary>
    /// Calculate the inital bearing between two Locations
    /// </summary>
    /// <param name="pointA"></param>
    /// <param name="pointB"></param>
    /// <param name="headingType"></param>
    /// <returns></returns>
    public static double BearingToLocation(Location pointA, Location pointB)
    {
        // Convert both locations from degrees to radians
        pointA = LocationToRad(pointA);
        pointB = LocationToRad(pointB);

        double partOne = exMath.Sin(pointB.Longitude - pointA.Longitude) * exMath.Cos(pointB.Latitude);
        double partTwo = exMath.Cos(pointA.Latitude) * exMath.Sin(pointB.Latitude) - exMath.Sin(pointA.Latitude) * exMath.Cos(pointB.Latitude) * exMath.Cos(pointB.Longitude - pointA.Longitude);
        double heading = AdditionalMath.ToDeg(exMath.Atan2(partOne, partTwo) % 2 * exMath.PI);

        // Solve for compass wrap around
        if (heading < 0)
            heading += 360;

        return heading;
    }

    /// <summary>
    /// Return a new location in radians
    /// </summary>
    /// <param name="pointA"></param>
    /// <returns></returns>
    public static Location LocationToRad(Location pointA)
    {
        return new Location(AdditionalMath.ToRad(pointA.Latitude), AdditionalMath.ToRad(pointA.Longitude), pointA.Altitude);
    }

}

/// <summary>
/// Misc. math functions not available in Elze Kool's lib
/// </summary>
public static class AdditionalMath
{
    /// <summary>
    /// Degrees to radians
    /// </summary>
    /// <param name="x"></param>
    /// <returns></returns>
    public static double ToRad(double x)
    {
        return exMath.PI * x / 180.00F;
    }

    /// <summary>
    /// Radians to degrees
    /// </summary>
    /// <param name="x"></param>
    /// <returns></returns>
    public static double ToDeg(double x)
    {
        return x * 180.00F / exMath.PI;
    }
}

誰能看到這個問題？ 我查看了一下，卻找不到問題。

Answer 1

%在此行中看起來像魚：

    double heading = AdditionalMath.ToDeg(exMath.Atan2(partOne, partTwo) % 2 * exMath.PI);