psyosphere (version 0.1.6)

t_speed: Add speed

Description

Speed towards the next coordinate in the track in kmh.

Usage

t_speed(
  tracks, bind = TRUE, drop = TRUE, cname = "speed", t_id = "id"
)

Arguments

tracks

psyo. Data frame with tracks.

bind

logical. Return the distance as list (FALSE) or add it to tracks (TRUE).

drop

logical. If TRUE and only one observation is returned drop the data frame and collapse the return value to a vector.

cname

character. Column name of the returned calculation result.

t_id

character or numeric. Column name in tracks that identifies the separate tracks.

Value

psyo

Details

For the last coordinate within a track the function returns NA because there is no speed towards a following coordinate possible.

See Also

t_bearing,t_distance, t_time_difference

Examples

# NOT RUN {
data(psyo)
psyo <- t_speed(psyo)
# }