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1、FastandSemi-automatic3DModelingandRoamingofLarge-scaleTerrain1,2122YuanzhengShao,LipingDiBingxuanGuo,JingCao12CenterforSpatialInformationScienceandSystemStateLaboratoryofInformationEngineeringforGeorgeMasonUniversitySurveying,MappingandRemoteSensing,Wuhan4400
2、UniversityDriver,Fairfax,VA,USAUniversity,129LuoyuRoad.yshao3@gmu.eduWuhan,ChinaAbstract—Extractingthefeaturesfromgeospatialdataandreconstructionfrompointcloudsandgroundplans.ChristianmodelingandroamingthesefeatureshavebecomeawideFrühandAvidehZakhor[4]describ
3、eautomatedmethodforapplicationindigitalcity.Inthetraditionalapproachtoachievefast,ground-basedacquisitionoflarge-scale3Dcitymodels.thewholescopeofthe3Dterrainvirtualroaming,modelingisaAlthoughthesemethodscanbereasonablyaccurate,thelargeandtime-consumingworklo
4、ad.Inthispaperafastandmodelingcycleisoftenlong.Specifically,theylacktheleveloffeasiblesolutionformodelingandroamingofterrainandculturedetailthatisrequiredforrealisticvirtualroaming.featuresisproposed.Itmainlyconcernshowtofastandsemi-automaticallycreatethemode
5、ls,whichbasedontheaerialInthispaper,weproposeanewandfastsemi-automaticimage，DEMandthevectordataoftheculturefeature.Amodelingsystem.Wecoverthewholeprocessofadigitalcity,roamingdesignisalsoproposedbyadoptingOSG(OpenScenefromthedatapreparationatbeginningtotheroa
6、mingandGraph).Experimentshowedthattheprocessofmodelinganddisplayatend.WeadoptTerraVistasoftwareasthebasicroamingistimesavingandeasytoimplement.modelingtool,whichisreleasedfromPresaGISandistheidealsolutionforthedevelopmentofrealisticandimmersiveKeywords-TerraV
7、ista;OpenSceneGraph;large-scaleterrain;simulations.Inaddition,weuseOSGastheplatformfor3Dsemi-automaticmodeling;digitalcity;roamingroaminganddisplay.OSGisanopensource,crossplatformgraphicstoolkitforthedevelopmentofhighperformanceI.INTRODUCTIONgraphicsapplicati
8、onssuchasflightsimulators,games,virtualrealityandscientificvisualization.AtthestageofdataThelarge-scaleterrainandcitymodelingnotonlyincludepreparation,therelatedpreprocessofobtaineddataar
