adjust_arrival_departure: Adjust the arrival and departure times of a GTFS data

In ipeaGIT/gtfs2gps: Converting Transport Data from GTFS Format to GPS-Like Records

Adjust the arrival and departure times of a GTFS data

Description

Some GTFS.zip data have issues related to arrival and departure time on stops. This function makes sure the GTFS has dis/embarking times at each stop. For each stop time row, this function applies the following steps:

1. If there is 'arrival_time' but no 'departure_time', it creates a departure_time column by summing the arrival plus a pre-defined 'min_lag'.

2. If there is 'departure_time' but no 'arrival_time', it creates an arrival_time column by subtracting a pre-defined 'min_lag' from the departure.

3. If there is an 'arrival_time' and a 'departure_time' but their difference is smaller than 'min_lag', it reduces the 'arrival_time' and increases 'departure_time' so that the difference will be exactly 'min_lag'.

Usage

adjust_arrival_departure(gtfs_data, min_lag = 20)

Arguments

gtfs_data	A GTFS data created with read_gtfs.
min_lag	Numeric. Minimum waiting time when a vehicle arrives at a stop. It can be a numeric or a units value that can be converted to seconds. Default is 20s.

Value

A GTFS with adjusted 'arrival_time' and 'departure_time' on data.table 'stop_times'.

Examples

poa <- read_gtfs(system.file("extdata/poa.zip", package="gtfs2gps"))

poa <- adjust_arrival_departure(poa)

ipeaGIT/gtfs2gps documentation built on Oct. 13, 2024, 6:34 p.m.