Calculate geodesic bearing to a location or locations based on longitude, latitude (from) input vectors and longitude, latitude (to) input vectors. The unit of bearing is degrees. The to values may be a single value or individual to each from location.
track_bearing_to(x, y, to_x, to_y)
longitude vector of to location/s
latitude vector of to locations/s
No missing values are required as padding, but input data with
NAs will incur an
NA in the output.
To use this on multiple track ids, use a grouped data frame with tidyverse code like
data %>% group_by(id) %>% mutate(bearing_to = track_bearing_to(lon, lat, to_lon, to_lat)).
Absolute bearing is relative to North (0), and proceeds clockwise positive and anti-clockwise
N = 0, E = 90, S = +/-180, W = -90.
There is no
NA padding in the output value (though missing values in the input will be mirrored
in the output).
a numeric vector of absolute bearing-to in degrees, see Details
1 2 3 4 5 6 7 8 9 10
track_bearing_to(trips0$x, trips0$y, to_x = 147, to_y = -42)[1:10] # N E S W track_bearing_to(0,0, c(0, 10, 0, -10), c(5, 0, -5, 0)) # maximum and minimum value are the same direction (due south) track_bearing(c(0, -0.00001), c(0, -1)) track_bearing(c(0, 0.00001), c(0, -1)) # the absolute minimum is north track_bearing(c(0, 0), c(0, 1))
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