Filter GTFS object by shape_id

Filters a GTFS object by shape_ids, keeping (or dropping) the relevant entries in each file.

Usage

filter_by_shape_id(gtfs, shape_id, keep = TRUE)

Arguments

gtfs

A GTFS object, as created by read_gtfs().

shape_id

A character vector. The shape_ids used to filter the data.

keep

A logical. Whether the entries related to the specified shape_ids should be kept or dropped (defaults to TRUE, which keeps the entries).

Value

The GTFS object passed to the gtfs parameter, after the filtering process.

See also

Other filtering functions: filter_by_agency_id(), filter_by_route_id(), filter_by_route_type(), filter_by_service_id(), filter_by_sf(), filter_by_spatial_extent(), filter_by_stop_id(), filter_by_time_of_day(), filter_by_trip_id(), filter_by_weekday()

Examples

data_path <- system.file("extdata/spo_gtfs.zip", package = "gtfstools")
gtfs <- read_gtfs(data_path)
shape_ids <- c("17846", "68962")

object.size(gtfs)
#> 811304 bytes

# keeps entries related to passed shape_ids
smaller_gtfs <- filter_by_shape_id(gtfs, shape_ids)
object.size(smaller_gtfs)
#> 99456 bytes

# drops entries related to passed shape_ids
smaller_gtfs <- filter_by_shape_id(gtfs, shape_ids, keep = FALSE)
object.size(smaller_gtfs)
#> 740840 bytes