Graphs in Transit

A study of transit system design using graph theory.

Frontend

Network Analysis: https://gtfs-graph.herokuapp.com/

• Page Rank
• Closeness Centrality
• Katz Centrality
• Accessibility
  • Reference: "Accessibility in complex networks", B.A.N. Travençolo and L. da Fontoura Costa, Physics Letters A, 2008.

Algorithm Demo: https://gtfs-graph.herokuapp.com/demo/

• Depth-First Search
• Breadth-First Search
• Dijkstra's Algorithm (Shortest Path Search)

Usage

gtfs-graph requires Node.js version 7.2.1.

After cloning the repository, be sure to install the necessary dependencies.

npm install

There is an npm command to build the JavaScript bundle and start the Node.js server. These are not joined because the combine sequence takes longer than 60 seconds to complete, with is Heroku's limit on server boot time. See Other for the component commands.

npm run all

Test

A test suite of mostly unit tests is included. To run the tests:

npm test

Other

To build the JavaScript bundle without starting the server, run:

npm run build-js

Then, the Node.js server may be started.

npm start

Advanced Usage

Command-line options are available for lib/server/index.js to customize a run.

--system will load the server for only a single specified system. Default: all.

node lib/server/index.js --system MBTA

--verbosity will run the server at the specified verbosity. Default: info.

node lib/server/index.js --verbosity verbose

API

Graph

api/v0/graph/[system]?type=[type]&filter=[filter]&mode=[mode]

System
mbta
mta
ratp

Graph Type
primary
merged
theoretical-1r
theoretical-2r
theoretical-3r
theoretical-4r
theoretical-5r

Filter
stops
edges

Mode (only valid if type==merged)
accessibility
closeness
katz
page_rank

System

api/v0/system/[system]

Special Thanks

Many thanks to Jason Park for the inspiration for this project. Check out his Algorithm Visualizer!