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The Inventors have developed iDiary, a patent-pending system that turns large GPS signals collected from smart-phones into textual descriptions of the trajectories. The system features a user interface similar to Google Search that allows users to type text queries on their activities (e.g. “Where did I buy books?”) and receive textual answers based on GPS signals. This technology can help to track urban movement patterns to better model and forecast global activities in a community—for example, to understand spatial trends (where people are aggregating), temporal trends (when people go where) and other urban characteristics (e.g. speed of traffic flow, travel time, etc.)