一种面向WFS服务的分布式空间连接查询优化策略
A Spatial Join Strategy Between OGC-Compliant Web Feature Services
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摘要: 研究了一般分布式环境下空间连接查询的优化策略,针对OGC的WFS服务规范的特点,提出了一种基于递归区域划分的WFS服务空间连接查询优化策略。实验结果表明,当查询区域范围内包含的数据量越大时,该策略越能有效地降低查询需要的网络数据传输费用,缩短查询执行时间。Abstract: We examine the problem of spatial join strategy between OGC-compliant Web feature services(WFS).Based on the semijoin-based join strategy and partition based spatial-merge join strategy,we present a spatial join processing strategy between two OGC-compliant WFS.The experimental result shows that when the cardinality of spatial entities in the query window is large enough,the proposed strategy can reduce the expensive of transmission cost and thus time cost.
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