Package index • transittraj

GTFS Helpers

Functions to manipulate tidygtfs objects.

filter_by_route(): Filter GTFS to a desired route(s) and direction(s)
get_shape_geometry(): Get the geometry of a route shape
project_onto_route(): Project points to linear distances along a route
get_stop_distances(): Get the distances of stops along routes
get_gtfs_service_dates(): Get a dataframe of all service dates and their service IDs from a GTFS
plot_interactive_gtfs(): Generate a Leaflet viewer of GTFS routes and stops

Functions to clean AVL data.

get_linear_distances(): Linearize latitude-longitude GPS points on a provided route shape
clean_overlapping_subtrips(): Remove trips with multiple operators or vehicles assigned to the same trip ID
clean_jumps(): Apply median filters to detect large jumps (i.e., outliers) in trajectories.
clean_incomplete_trips(): Filter out entire trips which do not meet distance or duration requirements
trim_trips(): Remove observations occurring before a trip's minimum distance, or after a trip's maximum distance
make_monotonic(): Correct distance observations, and optionally speeds, to be weakly or strictly monotonic

Functions to build trajectory objections.

get_trajectory_fun(): Fit continuous trajectory interpolating curves from AVL data
get_gtfs_trajectory_fun(): Fit continuous trajectory interpolating curves from GTFS schedule data
group_trajectories(): Group existing trajectory objects or split them apart

Functions to plot trajectories.

plot(<avltrajectory_group>) plot(<avltrajectory_single>): Quickly plot an AVL trajectory
plot_animated_line() plot_animated_map(): Animate vehicle trajectory or AVL data
plot_trajectory(): Plot vehicle trajectories or AVL data
export_animation(): Save an animation at a desired quality

Functions for using trajectories.

predict(<avltrajectory_group>): Interpolate time or distance points using AVL trajectories
print(<avltrajectory_group>) print(<avltrajectory_single>): Print an AVL trajectory object
summary(<avltrajectory_group>) summary(<avltrajectory_single>): Summarize an AVL trajectory object
get_trip_extremes(): Get the distance and time range of each trip in a trajectory object

Functions for validating data.

validate_tides(): Check if AVL data meets TIDES standards
validate_monotonicity(): Check if AVL data satisfies assumptions of monotonicity

Datasets to test with.

lacmta_avl: LA Metro AVL Data
lacmta_gtfs: LA Metro GTFS
new_transittraj_data(): Retrieve an object from a particular step of transittraj's workflow