Searching for authors named "Kostas Gratsias" – sorted by Relevance.

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3 documents found, showing 1 through 3.

THEODORIDIS Y.: Towards a Taxonomy of Location Based Services
by Kostas Gratsias, Elias Frentzos, Vasilis Delis, Yannis Theodoridis — 2005 — W2GIS 2005, Lecture Notes in Computer Science
…Abstract. Location-based services (LBS) constitute an emerging application domain involving spatio-temporal databases. In this paper, i) we propose a classification of LBS, depending on whether the user (query object) and the data objects are moving or not and ii) we provide algorithms for the effic…
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1 Index-based Most Similar Trajectory Search
by Elias Frentzos, Kostas Gratsias, Yannis Theodoridis, Elias Frentzos, Kostas Gratsias, Yannis Theodoridis — 2006
…The problem of trajectory similarity in moving object databases is a relatively new topic in the spatial and spatiotemporal database literature. Existing work focuses on the spatial notion of similarity ignoring the temporal dimension of trajectories and disregarding the presence of a general-purpos…
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Nearest neighbor search on moving object trajectories
by Elias Frentzos, Kostas Gratsias, Nikos Pelekis, Yannis Theodoridis — 2005 — In Proc. of the 9th Intl. Symp. on Spatial and Temporal Databases (SSTD
…Abstract. With the increasing number of Mobile Location Services (MLS), the need for effective k-NN query processing over historical trajectory data has become the vehicle for data analysis, thus improving existing or even proposing new services. In this paper, we investigate mechanisms to perform N…
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