User-facing constructor for SSFS objects. Called with no arguments, it returns a valid empty skeleton with the correct column types - the simplest way to start building a transit network programmatically. Called with one or more table arguments, it assembles and validates them into a complete ssfs object.
Usage
ssfs(
agency = NULL,
routes = NULL,
stops = NULL,
itin = NULL,
stop_seq = NULL,
span = NULL,
hsh = NULL,
calendar = NULL
)Arguments
- agency
A data.frame with columns: agency_id, agency_name, agency_url, agency_timezone. Defaults to an empty data.frame with these columns.
- routes
A data.frame with columns: route_id, agency_id, route_short_name, route_long_name, route_type, route_color, route_text_color. Defaults to an empty data.frame with these columns.
- stops
An sf data.frame (POINT, CRS 4326) with columns: stop_id, stop_name, geometry. Defaults to an empty sf with these columns.
- itin
An sf data.frame (LINESTRING, CRS 4326) with columns: itin_id, route_id, direction_id, trip_headsign, geometry. Defaults to an empty sf with these columns.
- stop_seq
A data.frame with columns: itin_id, stop_id, stop_sequence, speed_factor. Defaults to an empty data.frame with these columns.
- span
A data.frame with columns: itin_id, service_id, service_window, first_dep, last_dep. Defaults to an empty data.frame with these columns.
- hsh
A data.frame with columns: itin_id, service_id, hour_dep, headway, speed. Defaults to an empty data.frame with these columns.
- calendar
A data.frame with columns: service_id, monday, tuesday, wednesday, thursday, friday, saturday, sunday, start_date, end_date. Defaults to an empty data.frame with these columns.
Examples
# Empty skeleton - start from scratch
my_ssfs <- ssfs()
my_ssfs
#> <ssfs> Simplified Speed and Frequency Specification
#> Agencies: 0
#> Routes: 0
#> Itineraries: 0
#> Stops: 0
#> Service IDs: 0
# Assemble from pre-built tables
my_ssfs <- ssfs(
agency = ligne_jaune$agency,
routes = ligne_jaune$routes,
stops = ligne_jaune$stops,
itin = ligne_jaune$itin,
stop_seq = ligne_jaune$stop_seq,
span = ligne_jaune$span,
hsh = ligne_jaune$hsh,
calendar = ligne_jaune$calendar
)