filter_functions: Filter a GTFS Feed

In GTFSwizard: Creating, Exploring, and Manipulating GTFS Files

Filter a GTFS Feed

Description

Filters a GTFS feed while preserving referential integrity across routes, trips, stops, shapes, calendars, frequencies, fares, and transfers.

Usage

filter_servicepattern(gtfs, servicepattern = NULL)

filter_date(gtfs, dates = NULL)

filter_service(gtfs, service)

filter_route(gtfs, route, keep = TRUE)

filter_trip(gtfs, trip, keep = TRUE)

filter_stop(gtfs, stop)

filter_time(gtfs, from = "00:00:00", to = "48:00:00")

Arguments

gtfs	A GTFS object.
servicepattern	Character vector of service-pattern IDs returned by [get_servicepattern()]. A pattern represents a distinct set of services active on a date. When 'NULL', the most frequent active pattern is used. The synthetic '"No service"' pattern cannot be used to filter trips.
dates	Dates to retain. Values accepted by [as.Date()] are supported. When 'NULL', the latest available service date is used.
service, route, trip, stop	Character vectors of IDs to retain.
keep	Logical. If 'FALSE', the specified route or trip IDs are excluded.
from, to	Inclusive GTFS time bounds in '"HH:MM:SS"' form. Hours may exceed 24.

Details

'filter_stop()' retains the requested stop calls and therefore may return partial trips. 'filter_time()' retains individual stop calls whose arrival or departure falls inside the inclusive time interval and may also return partial trips. This behavior is useful for network experiments. Route, trip, service, service-pattern, and date filters retain complete trips.

'filter_date()' rewrites service availability as 'calendar_dates' additions for exactly the selected dates. Other filters preserve the selected services' original date ranges and exceptions.

Value

A 'wizardgtfs' object.

References

[GTFS Schedule Reference](https://gtfs.org/documentation/schedule/reference/)

See Also

[GTFSwizard::as_wizardgtfs()], [GTFSwizard::get_servicepattern()]

Examples

typical <- filter_servicepattern(for_rail_gtfs)
one_day <- filter_date(for_rail_gtfs, "2021-02-10")
one_route <- filter_route(for_rail_gtfs, for_rail_gtfs$routes$route_id[1])
two_trips <- filter_trip(for_rail_gtfs, for_rail_gtfs$trips$trip_id[1:2])
serving_stop <- filter_stop(for_rail_gtfs, for_rail_gtfs$stops$stop_id[1])
morning <- filter_time(for_rail_gtfs, from = "06:30:00", to = "10:00:00")

GTFSwizard documentation built on Aug. 21, 2026, 5:16 p.m.