The calculated distance also for position reports on the ground; the algorithm used is the one of distCosine.

cumulative_distance(positions)

## Arguments

positions the position reports for the flight

## Value

a dataframe with a new cumulative_distance column (in km)

Other positions enhancements functions: cumulative_time

## Examples

# NOT RUN {
cumulative_distance(poss)
# calculate only the flown distance
# NOTE: there is a gap in FR24 data between last ground position (if any)
#       and first in air one (typically at ~1500 ft).
#       The following code would certainly work better
#       would poss contain a position report for a very low altitude.
cumulative_distance(poss %>% filter(altitude > 0))
# }