Since fall 2010, as part of a contract with Los Angeles Metropolitan Transportation Authority (LA-Metro), researchers at the University of Southern California’s (USC) Integrated Media Systems Center
(IMSC) have been given access to high-resolution spatiotemporal transportation data from the LA County road network. This data arrives at 46 megabytes per minute and over 15 terabytes have been collected so far. IMSC researchers have developed an end-to-end system called TransDec (for Transportation Decision-making) to acquire, store, analyze and visualize these datasets (see the accompanying figure). Here, we discuss various components of TransDec corresponding to the Big Data flow depicted in Figure 2.