基于STRIPTREE的矢量地图渐进式传输的研究

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1、西南交通大学硕士学位论文基于Strip-Tree的矢量地图渐进式传输的研究姓名：刘建忠申请学位级别：硕士专业：计算机应用技术指导教师：齐华20070401西南交通大学硕士研究生学位论文第一I卜页AbstractAlongwithgeographicinformationsystemapplication’sexpansion，greaterdemandsforvectogmapsareneeded．However,thegeneralvectormapdataisalmostlargeandnetworkbandwidthislimited

2、．Howtoimprovetheefficiencyofmapdatadeliveryhasbecomeaseriousproblem．Progressivetransmissionisanowtypeofnetworkdatatransmission,themapdatatransmissionbasedonGRID，TIN，DEMstructurehasbeenwidelyused．However,vectormapdata’sprogressivetransmissioniscomplex．Becausethevectordata's

3、progressivetransmissiondoesnotlikerastermapdata’sprogressivetransmissiononlybyline／colunminterpolation．Vectordata’sprogressivetransmissionmusttakeintoaocoontitstopology．Thispaperaimstoimprovetheefficiencyofspatialdatadeliveryonthepremiseoftheprotectionofthemaps’quality-For

4、thispurpose,thispaperfocusesonkeytechnologiesofvectormapdata’sprogressivetransmissionandthedesignandimplementationofprototypesystem．Maincontentsinclude：Introducingthebasicconceptsofvectormapdata'sprogressivetransmissionandanalyzingitsrootcauses；Reviewingandsummarizingthest

5、atusofresearchathomeandabroadandpointingouttheworthinessofimprovementareas；Detailedlyintroducingthealgorithmoflinesimplificationanditsimprovedalgorithms．Thenanalyzetheadvantagesanddisadvantagesofthealgorithmsfortheapplicationofprototypesystem；Focusingonthelinelayercompress

6、ionandreconstructionalgorithmbasedonstriptree,thealgorithmcan,effectivelycompressandreconstructthecurvplayer，noself-Intersectionandintersectionappearing；Analyzingandstudyingthecontrolstrategyofprogressivetransmission；Focusingonserverandclienthowtoadaptthetransmissionratein

7、thecircumstancesofnetworkbandwidthfluctuations，sothatitcanachievebeHerresultsoftransmission．Basedontheseresearches，implementedavectormapsprogressivetransmissionprototypesystembasedellC／Smodel．Experimentalresultshowsthattheprototypesystemofvectormapdata’progressivetransmiss

8、ioncanreducetheuserswaitingtimeandimprovethedeliveryefficiencyofspatialdataonthepremiseof