Total distance travelled along each trajectory. With a distance calibration
set ([set_distance_scale()]) the result is in physical units; otherwise in the
units of the recorded `x`/`y` coordinates.
Usage
track_length(ts, x_col = ts@cols$x, y_col = ts@cols$y)
Arguments
- ts
A `Tracks`.
- x_col, y_col
Names of the coordinate columns. Default to the `Tracks`'s
recorded x/y columns.
Value
A `data.frame` with one row per trajectory: the id column and a
numeric `length` column.
See also
[set_distance_scale()], [track_speed()], [straightness_index()]
