Direction between 2 Latitude/Longitude points in C#?

Question

I have 2 coordinates in Lat Long format. 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) I'm looking for a value like "340 Degrees" In C#

Answer 1

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);