二维电子地图与三维虚拟场景的互响应与可视化

iiiDYNAMICRESPONSEANDVISUALIZATIONOF2DDIGITALMAPAND3DVIRTUALSCENEByHUANGJianXiSupervisorsProfessorWuHehaiAssociateProfessorLongYiMajorCartographyandGISWuhanUniversityApril30,2002i)VegaiiAbstractWiththerapiddevelopmentofcomputertechnologies,especiallyComputerGraphicsWebMulti-MediaSimulationVirtualReality.Thisgreatlypropelsthedevelopmentof2DdigitalMap.3Delectronicmapbasedon3Dvirtualsceneisbecominganimportantdevelopmentaltrendof2Ddigitalmap.ButItisimpossiblethat3Dvirtualscenecanreplace2Ddigitalmapcompletely.Thebestwayistheintegrationof2Ddigitalmapand3Dvirtualscene.Thethesisputsforwardtheideaofthedynamicresponsebetween2Ddigitalmapand3Dvirtualscenetoresolvethelimitationof2Ddigitalmapand3Dvirtualscene,whichcombinetheadvantageof2Ddigitalmapmacroviewwholeconciseandtheadvantageof3Dvirtualscenelocalrealisticliving,atthesametimeovercomestheabstractionof2Ddigitalmapandwanderingastrayof3Dvirtualscene.Thisthesisalsogivesseveralmanifestationofdynamicresponsebetween2Ddigitalmapand3DvirtualsceneFirstly,whenyouarewanderinginthe3Dvirtualscene,itwillshowthecorrespondingpositionofviewpointinthe2Ddigitalmap.secondly,whenyouchangethepositionofobserverinthe2Ddigitalmap,itwilljumptothecorrespondingpositioninthe3Dvirtualscene.Thirdly,whenyouquerytheattributeinformationofobjectsinthe2Ddigitalmap,itwillhighlightthecorrespondingobjectsinthe3Dvirtualscene.Fourthly,whenyouquerytheattributeinformationofobjectsinthe3Dvirtualscene,itwillhighlightthecorrespondingobjectsinthe2Ddigitalmap.Fifthly,youcanimplementthedual-querybetweenspatialinformationandattributeinformation.Sixthly,whenyouselectobjectswithinspecifiedregioninthe2Ddigitalmap,itwillloadthecorrespondingobjectsinthe3Dvirtualscenedynamically.Seventhly,youcandefinearouteinthe2Ddigitalmap,itwillflyalongthecorrespondingrouteinthe3Dvirtualscene.Thisthesisalsoexploresthevisualizationof2Ddigitalmapand3Dvirtualsceneandthevisualizationofdynamicresponse.Severalkeyissuesispresented,includingdataacquisitionof3Dvirtualscene,andcreatingthe3Dmodellibraryandsoon.Somekeytechnologies,suchasLODBillboardInstanceTexturemappingisalsopresented.Finally,TheauthorofthethesisintegratesasystemofdynamicresponseandvisualizationbasedonVC++platformandVegaAPI.Keywords2DDigitalmap3DVirtualSceneDynamicResponseVegaiii·····································································································IABSTRACT···························································································II····································································································1··························································································21.1··················································································21.2··········································································21.3··································································3····················································52.1···················································································52.2··················································································52.2.1·······························································································52.2.2·····························································72.3··················································92.4············································11·······················································································11····································133.1·········································································133.2·················································································143.3·········································································153.4·················································································153.5·····················································································19····································214.1········································································214.2····················································································214.2.1···········································································214.2.2···············································································224.3·······································································254.3.1··········································································254.3.2··············································································26········································································325.1·····················································································325.1.1·····················································································335.1.2········································35···············································································376.1···················································································