Skill Summary

Language	Method
D3	Mapping with D3
D3	Force-directed graph/td>

I was part of a group of students who sought to identify and measure the effect of multiple simultaneous disruptions on the NYC Subway system as an example of urban vulnerability. We constructed a network model based on train schedule information for a typical weekday rush hour and estimate demand distribution from origin-destination data derived from census data in order to assess the cumulative delay caused by first a single, then a pair of simultaneous disruptions to the network. In particular, we analyzed the scenario in which a pair of simultaneous disruptions caused an effect greater than the effect of the single disruptions together.

This Visualization

The graph represents our model of the subway system as a directed, weighted network; with nodes representing subway stations and edges representing the connections between stations, characterized by the route attributes.
Each dark blue master node in the network represents a subway station and each light blue sub node represents a line at each station. The purpose of separating lines and stations is so that we keep open the possibility modeling disruptions of varying capacities and proportions.
Double click on a node to view its neighbors. Search for a station by name to isolate it on the graph.
Each master node is sized according to its criticality: total time needed to transfer between each pair of destinations in the network once the node if removed.