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Continuous top-k spatial–keyword search on dynamic objects

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Abstract

As the popularity of SNS- and GPS-equipped mobile devices rapidly grows, numerous location-based applications have emerged. A common scenario is that a large number of users change location and interests from time to time; e.g., a user watches news, blogs, and videos while moving outside. Many online services have been developed based on continuously querying spatial–keyword objects. For instance, Twitter adjusts advertisements based on the location and the content of the message a user has just tweeted. In this paper, we investigate the case of dynamic spatial–keyword objects whose locations and keywords change over time. We study the problem of continuously tracking top-\(k\) dynamic spatial–keyword objects for a given set of queries. Answering this type of queries benefits many location-aware services such as e-commerce potential customer identification, drone delivery, and self-driving stores. We develop a solution based on a grid index. To deal with the changing locations and keywords of objects, our solution first finds the set of queries whose results are affected by the change and then updates the results of these queries. We propose a series of indexing and query processing techniques to accelerate the two procedures. We also discuss batch processing to cope with the case when multiple objects change locations and keywords in a time interval and top-\(k\) results are reported afterward. Experiments on real and synthetic datasets demonstrate the efficiency of our method and its superiority over alternative solutions.

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Notes

  1. This scoring function is also used in [31].

  2. One may want to keep only the \((k+1)\)th object, but this object may change state while q is outside both \(Q_{prev}\) and \(Q_{next}\), hence difficult to track.

  3. A special case is \(SimST(o^{t'}, q) = q.score(k, t)\). o is the kth result at \(t'\) and no further action is required. We omit it in the pseudo-code for conciseness.

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Acknowledgements

Chuan Xiao was supported by JSPS Kakenhi 17H06099, 18H04093, and 19K11979. Hanxiong Chen was supported by JSPS Kakenhi 19K12114. Jeffrey Xu Yu was supported by the Research Grants Council of Hong Kong, China, Nos. 14203618 and 14202919. Hiroyuki Kitagawa was supported by JSPS Kakenhi 19H04114.

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Authors and Affiliations

  1. NEC Corporation, Tokyo, Japan

    Yuyang Dong, Kunihiro Takeoka & Masafumi Oyamada

  2. Osaka University, Osaka, Japan

    Chuan Xiao

  3. Nagoya University, Nagoya, Japan

    Chuan Xiao

  4. University of Tsukuba, Tsukuba, Japan

    Hanxiong Chen & Hiroyuki Kitagawa

  5. Chinese University of Hong Kong, Hong Kong, China

    Jeffrey Xu Yu

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  1. Yuyang Dong
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Dong, Y., Xiao, C., Chen, H. et al. Continuous top-k spatial–keyword search on dynamic objects. The VLDB Journal 30, 141–161 (2021). https://doi.org/10.1007/s00778-020-00627-4

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