Demo

Abstract

GPS-Enabled devices such as smartphones are widely used. With GPS chips that uses lower energy, GPS location and traces are widely collected by different users. One important useful usage is extracting the speed of a user in vehicle to determine real-time and historical speed of traffic in each road in the city. Accumulating these speed records allows the creation of speed profiles. Speed profiles define the general behavior (i.e., traffic speed) of each road at each time of the day. In this demo, we show an energy-efficient location acquisition algorithm to collect traces, a map-matching algorithm to construct the path that the user has taken, an algorithm to calculate the average speed of the vehicle and a speed profile of different road segments used to provide historical, real-time and predicted traffic speed. We also display the whole system in action with data of over 1000 traces collected in Trento, Italy.