compute initial bearing along a great circle path

This function provides a convienant wrapper to bearing

et_bearing_initial(latitude1, longitude1, latitude2, longitude2)

Arguments

latitude1

numeric vector of latitudes [degrees]
longitude1

numeric vector of longitudes [degrees] corresponding with latitude1
latitude2

numeric vector of latitudes [degrees]
longitude2

numeric vector of longitudes [degrees] corresponding with latitude2

Value

numeric, bearing in degrees