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Multi-objective spatial keyword query with semantics: a distance-owner based approach

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Abstract

Multi-objective spatial keyword query aims to find a set of objects that are reasonably distributed in spatial, with all query objectives to be satisfied. However, existing approaches mainly take the coverage of query keywords into account, while leaving the semantics of the textual data to be largely ignored. This limits us to return those rational results that are synonyms but morphologically different. To address this problem, this paper studies the problem of multi-objective spatial keyword query with semantics, and targets to return the object set that is optimum regarding to both spatial proximity and semantic relevance. Specifically, we take advantage of the probabilistic topic model and locality sensitive hashing (LSH), so that all query objectives can be satisfied in terms of their semantics. Afterwards, a novel indexing structure called LIR-tree is designed to integrate the spatial and semantic information of all objects in a balanced way. On top of the LIR-tree, we further propose a distance-owner based query processing algorithm, which provides tight bounds to achieve superb pruning effect in the searching phase. To speed up the processing, a distance owners based replacement strategy can be used to conduct approximate querying more efficiently. Empirical study based on a real dataset demonstrates the good effectiveness and efficiency of our proposed algorithms.

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Acknowledgements

This work was partially supported by the National Key Research and Development Program of China (No. 2018YFB2100400), and the National Science Foundation of China (Nos. 61872258, 61572335, 61872100).

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Authors and Affiliations

  1. Cyberspace Institute of Advanced Technology, Guangzhou University, Guangzhou, China

    Jiajie Xu & Lihua Yin

  2. School of Computer Science and Technology, Soochow University, Suzhou, China

    Jiajie Xu & Jing Chen

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  1. Jiajie Xu
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  2. Jing Chen
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  3. Lihua Yin
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Correspondence to Lihua Yin.

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Xu, J., Chen, J. & Yin, L. Multi-objective spatial keyword query with semantics: a distance-owner based approach. Distrib Parallel Databases 38, 625–647 (2020). https://doi.org/10.1007/s10619-020-07283-1

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