gtfs_isochrones: Produces isochrones as an sf-object

In mflucas/gtfsTools: GTFS DISPLAY AND MANAGEMENT TOOLS

Description

gtfs_isochrones Creates one SP Object containg a isochrones calculated from a tidytransit::raptor result. The function uses the minimal travel times from the start stop to all stops as a main input parameter. This isochrone is a not meant to depict exact reachibility of transit in detail. Use opentripplanner for this instead. The goal here is to provide a decent overview of transit access at larger scales (regional, national or continental). IMPORTANT: The raptor_result table has to have only have one single stop as origin

Usage

gtfs_isochrones(
  raptor_result,
  stops,
  breaks = c(3600, 2 * 3600, 3 * 3600),
  hull_alpha_min = 0.2,
  buffer_value = 5000
)

Arguments

raptor_result	A result from tidytransit::raptor function
stops	A stops dataframe obtained from a tidytransit gtfs object: gtfs$stops
breaks	A vector containing the travel time breaks for the isochrone in seconds.
hull_alpha_min	The alpha values increase by increasing break interval for better graphic display of the isochrones.
buffer_value	The shapes are buffered in the end for graphic display. Value in meters.

Value

An sp object with features corresponding to the isochrones of the breaks provided in 'breaks'.

mflucas/gtfsTools documentation built on March 2, 2021, 3:24 a.m.