面向wfs服务的空间查询优化策略-研究

《面向wfs服务的空间查询优化策略-研究》由会员上传分享，免费在线阅读，更多相关内容在教育资源-天天文库。

1、selectivitythroughselectivityestimativealgorithm.ItprovesthattheservicesystembasedontheWFScombiningwithalgorithmandoptimizationstrategycaneffectivelyreducetheamountofdataofintermediaterelationsanddecreasethenetworkcommunicationcosts.Thusitcanachievethepurposeofqueryoptimization.Finally,weputforward

2、anewalgotithmbasedonthetraditionalPowerLawsandtheMPHistogramStatistic.BycalculatingspecificspatialjoinselectivityandcomparingwiththeMPHistogramStatistic,theproposedalgorithmisprovedtobefeasible.Theworksinthisdissertationenrichandexpandthetheoriesforspatialjoinselectivityestimationandtheoptimization

3、strategyusedindistributedspatialdatabasesservicesystems.Theseresearchesprovideafeasiblepathtoimproveefficiencyofqueriesingeographicinformationsystems.Keywords:WebFeatureService,QueryOptimaztion,SpatialJoin,MPHistogramStatistic,thePowerLaws.III万方数据目录摘要................................................

4、.................................IAbstract..............................................................................II目录................................................................................IV第1章绪论...........................................................................11.1研究背景.....

5、...................................................................11.2研究现状........................................................................21.3研究内容........................................................................31.4文章小节................................................................

6、.......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...................................................................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

7、.4WFS服务规范与XML传输格式......................................................92.4.1OGCWFS规范定义..........................................................92.4.2WFS规范的主要操作.............................................