一种面向WFS服务的分布式空间连接查询优化策略

¹武汉大学测绘学院,武汉市珞喻路129号430079;²清华大学公共安全研究中心,北京市海淀区100084;³中国测绘科学研究院地理信息工程国家测绘局重点实验室,北京市北太平路16号100039

基金项目: 国家科技支撑计划重点资助项目(2006BAK01A03)

详细信息

A Spatial Join Strategy Between OGC-Compliant Web Feature Services

¹ School of Geodesy and Geomatics,Wuhan University,129 Luoyu Road,Wuhan 430079,China; ² Center for Public Safety Research,Tsinghua University,Haidian District,Beijing 100084,China; ³ Key Laboratory of Geo-Informatics of State Bureau of Surveying and Mapping,Chinese Academy of Surveying & Mapping, 16 Beitaiping Road,Beijing 100039,China

Funds: 国家科技支撑计划重点资助项目(2006BAK01A03)

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。
- 网络要素服务 /
- 空间连接 /
- 查询优化 /
- 递归区域划分
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.
- Web feature services /
- spatial join /
- query optimization /
- iterative partition