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...edicates. When a temporal constraint is empty, ordering will be implied by the actual position of the associated predicate in the query sequence. An alternative query expression mechanism appeared in =-=[3]-=-, where regular expressions were used to represent mobility patterns. More details and limitations of this approach appear in the related work. We say that a trajectory satisfies an STP query if it sa...

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...the potential of data mining for movement patterns has been acknowledged [31,32,53]. For example, Du Mouza and Rigaux propose mobility patterns that describe sequences of moves in a discrete 2D-space =-=[11]-=-. In a GIScience context, activity related movement patterns have been researched, often with respect to improving location-based services (LBS). Dykes and Mountain search episodes expressing distinct...

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...e owner. A systematic approach towards incremental semantic abstraction of raw trajectory data is not addressed. A body of work exists in defining semantic abstractions over trajectory data [16][1][6]=-=[13]-=-[19][17]. Spaccapietra et al. [16] provide a trajectory structure as a sequence of moves and stops in between, with begin and end events to represent a trajectory. Work also exists on analysis of tour...

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...have been proposed for efficiently querying raw trajectory data such as [Kuijpers and Othman 2007, Wolfson et al. 1998], but only a few approaches [Brakatsoulas et al. 2004, Spaccapietra et al. 2007, =-=Mouza and Rigaux 2005-=-]sSpatial Data Mining Trajectory Data Mining Geographic application Geographic Database Maps, Shape files, ... Raw Geographic Data from satellite images, remote sensing,... Data Mining and Knowledge D...

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... and moves. These alike stop-move models have been applied for enriching trajectory semantics by using geographic knowledge such as point of interests [1] [3], in whichthe focus is on stops; whilst, =-=[6]-=- represents trajectory as a sequence of moves between regions. In addition to these new models targeting so called semantic trajectories, there are also recently emerging some novel trajectory studies...

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...ces the number of generated patterns by mining only frequent closed subsequences, i.e., those containing no super-sequence with the same support. In the field of trajectory analysis, Mouza and Rigaux =-=[5]-=- proposed a language based on regular expressions for querying mobility patterns in trajectories where each zone could be represented by its label (a constant) or by a variable (@x). In this language,...

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...lties for the general constraint query language to express some trajectory specific queries. In fact, querying trajectories seems to demand new techniques in the query languages. The recent effort in =-=[13, 9]-=- made a significant step towards understanding some of these issues. In [13] Erwig and Schneider elevate topological predicates to spatio-temporal predicates by aggregating astemporal dimension to spa...

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...rties of moving objects, geometric elements of GIS layers and OLAP data storing the non-spatial GIS data. Recently, in the study of moving object data, the concepts of stops and moves were introduced =-=[13,2]-=-. These concepts serve to compress the trajectory data that is produced by moving objects using application dependent places of interest. A designer may want to select a set of places of interest that...