turnAngleGc: Calculates turning angles on great circle tracks
Description
This function returns the turn angels of a great circle track.
Usage
"turnAngleGc"(x)
Arguments
x
Move object, in long lat projection
Value
The function returns the turning angles in degrees.
Details
On great circle tracks the bearing of arrival on a point is not the same as witch the previous point was left. This function returns the difference between these bearings between -180 and 180. The bearings are calculated using the functions bearing and finalBearing of the geosphere package.