Big data, in reality, is the aggregation of various information resources, analysis, **** enjoy, everyone in the community to work, live, there are a variety of activities trajectory, as long as these trajectories captured, with a timeline a series of linkage, you can query the individual's trajectory.

The data source of the location query service provided by the trip card is "cell phone signaling data" , obtained through the location of the base station where the user's cell phone is located. In order to ensure continuous communication, achieve coverage without blind spots, and provide better communication service quality, the signals of the two base stations at the junction of administrative divisions may be cross-covered, resulting in deviation of the results.