Low-level constructor. Assembles the 8 component tables into a list and
assigns the "ssfs" class. Performs no validation — use validate_ssfs()
or the user-facing ssfs() constructor for safety checks.
Arguments
- agency
A data.frame with columns: agency_id, agency_name, agency_url, agency_timezone.
- routes
A data.frame with columns: route_id, agency_id, route_short_name, route_long_name, route_type, route_color, route_text_color.
- stops
An sf data.frame (POINT, CRS 4326) with columns: stop_id, stop_name, geometry.
- itin
An sf data.frame (LINESTRING, CRS 4326) with columns: itin_id, route_id, direction_id, trip_headsign, geometry.
- stop_seq
A data.frame with columns: itin_id, stop_id, stop_sequence, speed_factor.
- span
A data.frame with columns: itin_id, service_id, service_window, first_dep, last_dep.
- hsh
A data.frame with columns: itin_id, service_id, hour_dep, headway, speed.
- calendar
A data.frame with columns: service_id, monday, tuesday, wednesday, thursday, friday, saturday, sunday, start_date, end_date.