| 摘要 |
The tracking system monitors many trackable devices each transmitting geographic locus, device id and event data via GPS, GPRS or GSM communications channels. The system is typically an ASP model and presents a dynamic display of the tracking device data to the user-customer. The system dynamically displays tracking data and a series of maps hierarchically or otherwise classified (e.g., region, state, city and site or yard maps). When the device transits from one classified map to another, the system automatically changes the map display to the next map based upon tracking locus data. The system also includes a geo fence and an automatic alert. User defined geographic limits are set as data boundaries on maps. These boundaries are overlaid on displayable maps. When devices transit the closed, user-defined geographic limits, an alert message is automatically generated. The system may also include a time-in or time-out, temporal limit.
|
