Commercial Operations

The original Marey graph, published in 1885, has become a frequent example of innovative

design in data visualization. It plots a French train timetable on a time-space diagram, intuitively

depicting the paths of trains throughout the day. These graphs continue to be used in transitrelated

applications such as the Google Transit Feed Specification (GTFS) Schedule Viewer. This

paper repurposes the original Marey graph for use in transit performance measurement by adding

schedule adherence and passenger load information. APC data preprocessing steps are described

and technological issues related to the development of the visualization are discussed. Finally,

this paper demonstrates how the Marey graph enables quick visual identification of vehicle

performance trends across space and time.

Berkeley Transportation Systems

Presented at the 18th World Congress on ITS, October 2011, Orlando, Florida