A new company is working to index the real world. Sense Networks officially launched its CitySense and MacroSense activity-tracking services Monday. The services use a combination of cell phone data, WiFi activity and vehicle GPS locations to measure where crowds are — and then put the information to use in a number of ways. Perhaps the most widely discussed feature is Sense Networks’ CitySense service. The program, available so far only in San Francisco, lets you look at real-time maps to discover, for example, which nightclubs are busiest on any given evening.
