Calculate sequential bearing on longitude, latitude input vectors. The unit of bearing is degrees.
By convention the last value is set to
NA missing value, because the bearing
applies to the segment extending from the current location.
To use this on multiple track ids, use a grouped data frame with tidyverse code like
data %>% group_by(id) %>% mutate(turn = track_bearing(lon, lat)).
Absolute bearing is relative to North (0), and proceeds clockwise positive and anti-clockwise
N = 0, E = 90, S = +/-180, W = -90.
The last value will be
NA as the bearing is relative to the first point of each segment.
a numeric vector of absolute bearing in degrees, see Details
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