Indexing Moving Objects for Trajectory Retrieval on Location-Based Services

Duksung LIM  Daesoo CHO  Bonghee HONG  

Publication
IEICE TRANSACTIONS on Information and Systems   Vol.E90-D   No.9   pp.1388-1397
Publication Date: 2007/09/01
Online ISSN: 1745-1361
DOI: 10.1093/ietisy/e90-d.9.1388
Print ISSN: 0916-8532
Type of Manuscript: PAPER
Category: Database
Keyword: 
moving object,  spatio-temporal index,  trajectory query,  

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Summary: 
Due to the continuous growth of wireless communication technology and mobile equipment, the history management of moving object is important in a wide range of location-based applications. To process queries for history data, trajectories, we generally use trajectory-preserving index schemes based on the trajectory preservation property. This property means that a leaf node only contains segments belonging to a particular trajectory, regardless of the spatiotemporal locality of segments. The sacrifice of spatiotemporal locality, however, causes the index to increase the dead space of MBBs of non-leaf nodes and the overlap between the MBBs of nodes. Therefore, an index scheme for trajectories shows good performance with trajectory-based queries, but not with coordinate-based queries, such as range queries. We propose new index schemes that improve the performance of range queries without reducing performance with trajectory based queries.