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1、FastandSemi-automatic3DModelingandRoamingofLarge-scaleTerrain1,2122YuanzhengShao,LipingDiBingxuanGuo,JingCao12CenterforSpatialInformationScienceandSystemStateLaboratoryofInformationEngineeringforGeorgeMasonUniversitySurveying,MappingandRemoteSensing,Wuhan4400UniversityDriver,Fairfax,VA,USAU
2、niversity,129LuoyuRoad.yshao3@gmu.eduWuhan,ChinaAbstract—Extractingthefeaturesfromgeospatialdataandreconstructionfrompointcloudsandgroundplans.ChristianmodelingandroamingthesefeatureshavebecomeawideFrühandAvidehZakhor[4]describeautomatedmethodforapplicationindigitalcity.Inthetraditionalappr
3、oachtoachievefast,ground-basedacquisitionoflarge-scale3Dcitymodels.thewholescopeofthe3Dterrainvirtualroaming,modelingisaAlthoughthesemethodscanbereasonablyaccurate,thelargeandtime-consumingworkload.Inthispaperafastandmodelingcycleisoftenlong.Specifically,theylacktheleveloffeasiblesolutionfo
4、rmodelingandroamingofterrainandculturedetailthatisrequiredforrealisticvirtualroaming.featuresisproposed.Itmainlyconcernshowtofastandsemi-automaticallycreatethemodels,whichbasedontheaerialInthispaper,weproposeanewandfastsemi-automaticimage，DEMandthevectordataoftheculturefeature.Amodelingsyst
5、em.Wecoverthewholeprocessofadigitalcity,roamingdesignisalsoproposedbyadoptingOSG(OpenScenefromthedatapreparationatbeginningtotheroamingandGraph).Experimentshowedthattheprocessofmodelinganddisplayatend.WeadoptTerraVistasoftwareasthebasicroamingistimesavingandeasytoimplement.modelingtool,whic
6、hisreleasedfromPresaGISandistheidealsolutionforthedevelopmentofrealisticandimmersiveKeywords-TerraVista;OpenSceneGraph;large-scaleterrain;simulations.Inaddition,weuseOSGastheplatformfor3Dsemi-automaticmodeling;digitalcity;roamingroaminganddisplay.OSGisanopensource,crossplatformgraphicstoolk
7、itforthedevelopmentofhighperformanceI.INTRODUCTIONgraphicsapplicationssuchasflightsimulators,games,virtualrealityandscientificvisualization.AtthestageofdataThelarge-scaleterrainandcitymodelingnotonlyincludepreparation,therelatedpreprocessofobtaineddataar
