Images: Tracking those roaming around Rome

This image captures cell phone activity during Madonna's appearance at Olympic Stadium in Rome last month. Usage spiked around the stadium and the Vatican.

Massachusetts Institute of Technology

These snapshots illustrate population movement in Rome around the time of the World Cup final and the following day. During the July 9 match, people were less active, most likely gathered around television sets (top and middle, far left). Once Italy won, people began celebrating and congregating at the Circus Maximus (bottom, far left). On July 10, when the Italian team arrived in Rome, people began celebrating throughout the streets (near left).

Massachusetts Institute of Technology

In an earlier look at cell phone use in Europe, MIT's Senseable City project mapped out patterns in Graz, Austria. The data included density of cell phone calls, their origins and destinations, and the whereabouts of users.

Senseable City Laboratory, MIT