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ID:27277419
大小:3.03 MB
页数:131页
时间:2018-12-02
《面向wfs服务的空间查询优化策略分析》由会员上传分享,免费在线阅读,更多相关内容在学术论文-天天文库。
1、-------selectivitythroughselectivityestimativealgorithm.ItprovesthattheservicesystembasedontheWFScombiningwithalgorithmandoptimizationstrategycaneffectivelyreducetheamountofdataofintermediaterelationsanddecreasethenetworkcommunicationcosts.Thusitcanachievethepurposeofqueryop
2、timization.Finally,weputforwardanewalgotithmbasedonthetraditionalPowerLawsandtheMPHistogramStatistic.BycalculatingspecificspatialjoinselectivityandcomparingwiththeMPHistogramStatistic,theproposedalgorithmisprovedtobefeasible.Theworksinthisdissertationenrichandexpandthetheori
3、esforspatialjoinselectivityestimationandtheoptimizationstrategyusedindistributedspatialdatabasesservicesystems.Theseresearchesprovideafeasiblepathtoimproveefficiencyofqueriesingeographicinformationsystems.Keywords:WebFeatureService,QueryOptimaztion,SpatialJoin,MPHistogramSta
4、tistic,thePowerLaws.III-----------万方数据-----------目录摘要.................................................................................IAbstract..............................................................................II目录..................................................
5、..............................IV第1章绪论...........................................................................11.1研究背景........................................................................11.2研究现状........................................................................21.
6、3研究内容........................................................................31.4文章小节.......................................................................5第2章空间地理数据与分布式存储传输...................................................62.1空间地理数据........................................
7、...........................62.2分布式数据库系统技术...........................................................72.3分布式数据库管理数据优化.......................................................82.4WFS服务规范与XML传输格式......................................................92.4.1OGCWFS规范定义...............
8、...........................................92.4.2WFS规范的主要操作................
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