GeoInformatica'05 (abstract)

We present a data model for tracking mobile objects and reporting the result of queries. The model relies on a discrete view of the spatio-temporal space, where the 2D space and the time axis are respectively partitioned in a finite set of user-defined areas and in constant-size intervals. We define a generic query language to retrieve objects that match em mobility patterns describing a sequence of moves. We also identify a subset of restrictions to this language in order to express only {\em deterministic} queries for which we discuss evaluation techniques to maintain incrementally the result of queries. The model is conceptually simple, efficient, and constitutes a practical and effective solution to the problem of continuously tracking moving objects with sequence queries.

Keywords: Mobility patterns, online evaluation, spatio-temporal applications.

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