Retrieving k-Nearest Neighboring Trajectories by a Set of Point Locations

  • Lu-An Tang
  • Yu Zheng
  • Xing Xie
  • Jing Yuan
  • Xiao Yu
  • Jiawei Han
Part of the Lecture Notes in Computer Science book series (LNCS, volume 6849)

Abstract

The advance of object tracking technologies leads to huge volumes of spatio-temporal data accumulated in the form of location trajectories. Such data bring us new opportunities and challenges in efficient trajectory retrieval. In this paper, we study a new type of query that finds the kNearestNeighboringTrajectories (k-NNT) with the minimum aggregated distance to a set of query points. Such queries, though have a broad range of applications like trip planning and moving object study, cannot be handled by traditional k-NN query processing techniques that only find the neighboring points of an object. To facilitate scalable, flexible and effective query execution, we propose a k-NN trajectory retrieval algorithm using a candidate-generation-and-verification strategy. The algorithm utilizes a data structure called globalheap to retrieve candidate trajectories near each individual query point. Then, at the verification step, it refines these trajectory candidates by a lower-bound computed based on the global heap. The global heap guarantees the candidate’s completeness (i.e., all the k-NNTs are included), and reduces the computational overhead of candidate verification. In addition, we propose a qualifierexpectation measure that ranks partial-matching candidate trajectories to accelerate query processing in the cases of non-uniform trajectory distributions or outlier query locations. Extensive experiments on both real and synthetic trajectory datasets demonstrate the feasibility and effectiveness of proposed methods.

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Copyright information

© Springer-Verlag Berlin Heidelberg 2011

Authors and Affiliations

  • Lu-An Tang
    • 1
    • 2
  • Yu Zheng
    • 2
  • Xing Xie
    • 2
  • Jing Yuan
    • 3
  • Xiao Yu
    • 1
  • Jiawei Han
    • 1
  1. 1.Computer Science DepartmentUIUCUSA
  2. 2.Microsoft Research AsiaChina
  3. 3.University of Science and Technology of ChinaChina

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