gtfs_natools
library and ArcGIS plugin for calculating walking/transit service area
ArcGIS’s Network Analyst extension is of limited use for studying public transit. Its functionality is fairly automobile-oriented, and it cannot accommodate public transit schedule information in its calculations. Furthermore, network datasets that include transit information are difficult to find or create.
The General Transit Feed Specification (GTFS) is a recently-developed data format for storing public transit routes, stops, and schedules. GTFS data is used in Google Maps transit trip...