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Personalized trajectory matching in spatial networks

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Abstract

With the increasing availability of moving-object tracking data, trajectory search and matching is increasingly important. We propose and investigate a novel problem called personalized trajectory matching (PTM). In contrast to conventional trajectory similarity search by spatial distance only, PTM takes into account the significance of each sample point in a query trajectory. A PTM query takes a trajectory with user-specified weights for each sample point in the trajectory as its argument. It returns the trajectory in an argument data set with the highest similarity to the query trajectory. We believe that this type of query may bring significant benefits to users in many popular applications such as route planning, carpooling, friend recommendation, traffic analysis, urban computing, and location-based services in general. PTM query processing faces two challenges: how to prune the search space during the query processing and how to schedule multiple so-called expansion centers effectively. To address these challenges, a novel two-phase search algorithm is proposed that carefully selects a set of expansion centers from the query trajectory and exploits upper and lower bounds to prune the search space in the spatial and temporal domains. An efficiency study reveals that the algorithm explores the minimum search space in both domains. Second, a heuristic search strategy based on priority ranking is developed to schedule the multiple expansion centers, which can further prune the search space and enhance the query efficiency. The performance of the PTM query is studied in extensive experiments based on real and synthetic trajectory data sets.

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Notes

  8. In the following computation, we only consider the situations where for all\(o_i \in q,~ rs_i < \epsilon _s\) and\(rt_i < \epsilon _t\). If\(rs_i \ge \epsilon _s\) (or\(rt_i \ge \epsilon _t\)), according to the definition of influence factor (Eqs. 2 and3), for data point\(v\) outside the browsed region, we have\(I_s(v,o_i) = 0\) (or\(I_t(v, o_i) = 0\)).

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Acknowledgments

This research is partially supported by the Natural Science Foundation of China (Grant No. 61232006), the National 863 High-tech Program (Grant No. 2012AA011001), the Australian Research Council (Grants No. DP110103423 and No. DP120102829), and the European Union (Grant No. FP7-PEOPLE-2010-ITN-264994). The research was performed when C. S. Jensen was with Aarhus University. Part of Shuo Shang’s work was done when he was a research assistant professor in Aalborg University.

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Authors and Affiliations

  1. Department of Software Engineering, China University of Petroleum-Beijing, Beijing, People’s Republic of China

    Shuo Shang

  2. Department of Computer Science, Aalborg University, Aalborg, Denmark

    Christian S. Jensen

  3. King Abdullah University of Science and Technology, Thuwal, Saudi Arabia

    Ruogu Ding & Panos Kalnis

  4. School of Information Technology and Electrical Engineering, The University of Queensland, Brisbane, Australia

    Kai Zheng & Xiaofang Zhou

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  1. Shuo Shang

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  2. Ruogu Ding

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  3. Kai Zheng

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  4. Christian S. Jensen

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  5. Panos Kalnis

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  6. Xiaofang Zhou

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Correspondence toShuo Shang.

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Shang, S., Ding, R., Zheng, K.et al. Personalized trajectory matching in spatial networks.The VLDB Journal23, 449–468 (2014). https://doi.org/10.1007/s00778-013-0331-0

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