A Spatiotemporal Model and Language for Moving Objects on Road Networks

A Spatiotemporal Model and Language for Moving Objects on Road Networks

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C.S. Jensen et al. (Eds.): SSTD 2001, LNCS 2121, pp. 20-35, 2001. © Springer-Verlag Berlin Heidelberg 2001 A Spatiotemporal Model and Language for Moving Objects on Road Networks Michalis Vazirgiannis 1 and Ouri Wolfson 2 * 1 Dept of Informatics, Athens University of Economics & Business Athens 10434, GREECE mvazirg@aueb.gr 2 Department of Electrical Engineering and Computer Science University of Illinois Chicago, IL 60607 USA wolfson@eecs.uic.edu Abstract. Moving object databases are becoming more popular due to the increasing number of application domains that deal with moving entities and need to pose queries. So far implementations of such systems have been rather weak and certainly not at industrial strength level. In this paper we define a concise data model and a set of powerful query predicates for moving objects. Moreover, we propose an implementation design based on off-the-shelf industrial solutions enhancing thus the applicability and robustness of our approach. Keywords : Spatiotemporal models, query language, data types. 1 Introduction There is a wide variety of applications that convey or manipulate objects that change their spatial features through time. Examples are: GIS applications involving time (i.e. evolution of regions over time, etc.), and real time applications for vehicle location sensing (cars, trains, aircraft or vessels monitoring etc). Another category of evolving such applications with intensive spatiotemporal content and dependencies are: inter- active multimedia documents, virtual reality applications, 3D animations, etc. The aforementioned application domains currently lack database support. It is a challenge to design a model that integrates the representational primitives in these domains and covers the requirements of the traditional spatial applications (i.e. GIS, enriched with time aspects) as well as of the new kind of applications mentioned above. Such models will enable storage of application objects as structured entities and then enable queries based on their spatiotemporal structure. In this context we envisage objects that move/change through time. These objects have a spatial extent that may change over time. From the extent of the object we may derive its position and, if applicable, its orien- * Ouri Wolfson's research was supported in part by ARL Grant DAAL01-96-2-0003, and NSF Grants ITR-0086144, CCR-9816633, CCR-9803974, IRI-9712967, EIA-0000516, INT- 9812325.
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A Spatiotemporal Model and Language for Moving Objects on Road Networks 21 tation. Then we would be interested in relationships among such objects. The relationships have spatial and/or temporal aspects as well as causal ones (i.e. the causes of the relation- ship, not only the resulting image i.e. of two overlapping objects). This illustrates the need for capturing these aspects of the objects in the database. A
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A Spatiotemporal Model and Language for Moving Objects on Road Networks

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