Trim a GTFS file between two dates

gtfs_trips_per_zone(
  gtfs,
  zone,
  startdate = min(gtfs$calendar$start_date),
  enddate = min(gtfs$calendar$start_date) + 31,
  zone_id = 1,
  by_mode = TRUE,
  ncores = 1,
  time_bands = list(breaks = c(-1, 6, 10, 15, 18, 22, Inf), labels = c("Night",
    "Morning Peak", "Midday", "Afternoon Peak", "Evening", "Night"))
)

Arguments

gtfs: GTFS object from gtfs_read()
zone: SF data frame of polygons
startdate: Start date
enddate: End date
zone_id: Which column in `zone` is the ID column
by_mode: logical, disaggregate by mode?
ncores: numeric, how many cores to use in parallel processing
time_bands: list with two named vectors breaks and labels. Used to define the time breakdown. Length of breaks must be one greater than length of labels.

Value

a data frame of trips per zone, day of week, and time band

Details

For frequency-based services (frequencies.txt), each departure implied by a frequency window is counted as a separate trip in the time band of its departure time.