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Erschienen in:
2005 | OriginalPaper | Buchkapitel
The Self-relocating Index Scheme for Telematics GIS
verfasst von : Duksung Lim, Bonghee Hong, Daesoo Cho
Erschienen in: Web and Wireless Geographical Information Systems
Verlag: Springer Berlin Heidelberg
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The history management of vehicles is important in telematics 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 a new index scheme that improves the performance of range queries without reducing performance with trajectory-based queries. In the new index scheme using the
entry relocation strategy
, two entries in different nodes are exchanged to minimize the dead spaces of the MBBs of the corresponding nodes.