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Issue No. 03 - March (2012 vol. 24)
ISSN: 1041-4347
pp: 547-560
Ken C.K. Lee , University of Massachusetts Dartmouth, Dartmouth
Wang-Chien Lee , Pennsylvania State University, University Park
Baihua Zheng , Singapore Management University, Singapore
Yuan Tian , Pennsylvania State University, University Park
In this paper, we present a new system framework called ROAD for spatial object search on road networks. ROAD is extensible to diverse object types and efficient for processing various location-dependent spatial queries (LDSQs), as it maintains objects separately from a given network and adopts an effective search space pruning technique. Based on our analysis on the two essential operations for LDSQ processing, namely, network traversal and object lookup, ROAD organizes a large road network as a hierarchy of interconnected regional subnetworks (called Rnets). Each Rnet is augmented with 1) shortcuts and 2) object abstracts to accelerate network traversals and provide quick object lookups, respectively. To manage those shortcuts and object abstracts, two cooperating indices, namely, Route Overlay and Association Directory are devised. In detail, we present 1) the Rnet hierarchy and several properties useful in constructing and maintaining the Rnet hierarchy, 2) the design and implementation of the ROAD framework, and 3) a suite of efficient search algorithms for single-source LDSQs and multisource LDSQs. We conduct a theoretical performance analysis and carry out a comprehensive empirical study to evaluate ROAD. The analysis and experiment results show the superiority of ROAD over the state-of-the-art approaches.
Location-dependent spatial query, spatial road network, indexing techniques, and search algorithms.

Y. Tian, W. Lee, K. C. Lee and B. Zheng, "ROAD: A New Spatial Object Search Framework for Road Networks," in IEEE Transactions on Knowledge & Data Engineering, vol. 24, no. , pp. 547-560, 2010.
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