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The collection of historical or real-time data on moving objects is quickly becoming a ubiquitous task. With the help of GPS devices, RFID sensors, RADAR, satellites, and other technologies, mobile objects of all sizes, whether it be a tiny cellphone or a giant ocean liner, can be easily tracked around the globe. Many fundamental problems in the database field have found their parallels in the moving object domain. They include indexing and query processing of moving objects over static or continuous queries and similarity search between moving objects. The same has happened with data mining problems as well. Clustering of moving objects is one popular topic; a spatial association pattern is another.
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