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    题名: Continuous Evaluation of Fastest Path Queries on Road Networks
    作者: Chia-Chen Lee
    陳良弼
    Yi-Hung Wu
    关键词: Fastest Path - Road Network - Continuous Query Processing
    日期: 2007
    上传时间: 2008-12-16 16:46:59 (UTC+8)
    摘要: The one-shot shortest path query has been studied for decades. However, in the applications on road networks, users are actually interested in the path with the minimum travel time (the fastest path), which varies as time goes. This motivates us to study the continuous evaluation of fastest path queries in order to capture the dynamics of road networks. Repeatedly evaluating a large number of fastest path queries at every moment is infeasible due to its computationally expensive cost. We propose a novel approach that employs the concept of the affecting area and the tolerance parameter to avoid the reevaluation while the travel time of the current answer is close enough to that of the fastest path. Furthermore, a grid-based index is designed to achieve the efficient processing of multiple queries. Experiments on real datasets show significant reduction on the total amount of reevaluation and therefore the cost for reevaluating a query.
    關聯: Lecture Notes in Computer Science, 4605, 20-37
    数据类型: article
    显示于类别:[Department of Computer Science ] Periodical Articles

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