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arXiv 1205.2880cs.DB
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轨迹数据库中空间关键词的高效检索

Efficient Spatial Keyword Search in Trajectory Databases

Gao Cong, Hua Lu, Beng Chin Ooi, Dongxiang Zhang, Meihui Zhang

摘要:

越来越多的轨迹数据被文本描述注释,以更好地捕捉与位置相关的语义。融合的空间位置和文字描述的轨迹产生了一种新类型的顶部$k$查询,考虑到这两个方面。所考虑的每个轨迹由与文本描述相关联的一系列地理空间位置组成。给定用户位置$λ$和关键字集合$ψ$,顶部$k$查询返回其文本描述覆盖关键字$ψ$并且具有最短匹配距离的$k$轨迹。据我们所知,以前的研究查询轨迹数据库集中在没有任何文字描述的轨迹数据,并没有现有的工作已经研究了这种顶部的$k$查询轨迹。本文提出了一种新的方法来有效地计算顶部$k$轨迹。该方法是基于一个新的混合索引,细胞关键字意识B $^+$树,表示为\cellbtree,这使我们能够利用文本相关性和位置接近,以促进高效和有效的查询处理。我们广泛的实证研究的结果与BerkeleyDB上的实现所提出的算法表明,我们提出的方法能够实现优异的性能和良好的可扩展性。

英文摘要:

An increasing amount of trajectory data is being annotated with text descriptions to better capture the semantics associated with locations. The fusion of spatial locations and text descriptions in trajectories engenders a new type of top-$k$ queries that take into account both aspects. Each trajectory in consideration consists of a sequence of geo-spatial locations associated with text descriptions. Given a user location $λ$ and a keyword set $ψ$, a top-$k$ query returns $k$ trajectories whose text descriptions cover the keywords $ψ$ and that have the shortest match distance. To the best of our knowledge, previous research on querying trajectory databases has focused on trajectory data without any text description, and no existing work has studied such kind of top-$k$ queries on trajectories. This paper proposes one novel method for efficiently computing top-$k$ trajectories. The method is developed based on a new hybrid index, cell-keyword conscious B$^+$-tree, denoted by \cellbtree, which enables us to exploit both text relevance and location proximity to facilitate efficient and effective query processing. The results of our extensive empirical studies with an implementation of the proposed algorithms on BerkeleyDB demonstrate that our proposed methods are capable of achieving excellent performance and good scalability.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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