Filters a GTFS object by stop_ids, keeping (or dropping) relevant entries
in each file. In order to keep the integrity of trips as described in the
stop_times table, the stop_ids are actually used to filter trip_ids,
which are then used to filter the rest of the GTFS object.
filter_by_stop_id(gtfs, stop_id, keep = TRUE)A GTFS object, as created by read_gtfs().
A character vector. The stop_ids used to filter the data.
A logical. Whether the entries related to the trip_ids that
passes through the specified stop_ids should be kept or dropped (defaults
to TRUE, which keeps the entries).
The GTFS object passed to the gtfs parameter, after the filtering
process.
Other filtering functions:
filter_by_agency_id(),
filter_by_route_id(),
filter_by_route_type(),
filter_by_service_id(),
filter_by_sf(),
filter_by_shape_id(),
filter_by_time_of_day(),
filter_by_trip_id(),
filter_by_weekday()
data_path <- system.file("extdata/spo_gtfs.zip", package = "gtfstools")
gtfs <- read_gtfs(data_path)
stop_ids <- c("18848", "940004157")
object.size(gtfs)
#> 811304 bytes
# keeps entries related to trips that pass through specified stop_ids
smaller_gtfs <- filter_by_stop_id(gtfs, stop_ids)
object.size(smaller_gtfs)
#> 95744 bytes
# drops entries related to trips that pass through specified stop_ids
smaller_gtfs <- filter_by_stop_id(gtfs, stop_ids, keep = FALSE)
object.size(smaller_gtfs)
#> 741512 bytes