简介:PolygonalobjectisafundamentaltypeofgeometricdatainvectorGIS.Thekeystepofcleaningtopologicalrelationshipafterdatacollectionofpolygonallayeristobuildpolygonalobjectsfromdigitalarcs.Therawdigitalarcsmayintersectwitheachother.Thealgorithmforbuildingpolygonalobjectsaftertherawarcshavebeensplitatallintersectionsispresented.Thebuild-upofpolygonalobjectsinthispaperisdesignedtobeimplementedbytwosteps.Thefirststepistoextractallthepolygonsneededforbuild-upofpolygonalobjectsfromarcs.Thesecondstepistoorganizepolygonalobjectsfromthesepolygons.Forthefirststep,atracingalgorithmisproposed.Thealgorithmmerelyextractsthepolygonsneededforthebuild-upofpolygonalobjects,whichisasubsetofallthepossiblepolygonsthatcanbeinducedfromthearcs.Forthesecondstep,analgorithmbasedonaspeciallydesignedorderofpolygonsisadvanced.Allthetopologicalrelationshipsamongthepolygonsaresho
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简介:Thispaperpresentsafieldbasedmethodtodealwiththedisplacementofbuildingcluster,whichisdrivenbythestreetwidening.Thecompressofstreetboundaryresultsintheforcetopushthebuildingmovinginsideandtheforcepropagationisadecayprocess.Todescribethephenomenonabove,thefieldtheoryisintroducedwiththerepresentationmodelofisoline.OnthebasisoftheskeletonofDelaunaytriangulation,thedisplacementfieldisbuiltinwhichthepropagationforceisrelatedtotheadjacencydegreewithrespecttothestreetboundary.Thestudyoffersthecomputationofdisplacementdirectionandoffsetdistanceforthebuildingdisplacement.Thevectoroperationisperformedonthebasisofgradeandotherfieldconcepts.
简介:SegmentationandedgeregulationarestudieddeeplytoextractbuildingsfromDSMdataproducedinthispaper.Buildingsegmentationisthefirststeptoextractbuildings,andanewsegmentationmethod-adaptiveiterativesegmentationconsideringratiomeansquare-isproposedtoextractthecontourofbuildingseffectively.Asub-image(suchas50×50pixels)oftheimageisprocessedinsequence,theaveragegraylevelanditsratiomeansquarearecalculatedfirst,thenthresholdofthesub-imageisselectedbyusingiterativethresholdsegmentation.Thecurrentpixelissegmentedaccordingtothethreshold,theaver-agegraylevelandtheratiomeansquareofthesub-image.Theedgepointsofthebuildingaregroupedaccordingtotheazimuthofneighborpoints,andthentheoptimalazimuthofthepointsthatbelongtothesamegroupcanbecalculatedbyusinglineinterpolation.
简介:Basedonthearchitecturalsurveyprojectof“theChiLinNunneryRedevelopment'inHongKong,thispaperattemptstoinvestigatethetechniquesofbuilding3Ddigitaldocumentoflarge_scaletimberstructureandqualitycontrolduringconstructionbycomputer_based3Dsimulationforthewholeproject.Therewereseveralkeyissuesincludingprimarydataacquisition,3Dmodelinganddisplay,pre_assemblingthetotalbuildingandqualityexamination,etc.Inthispaper,someusefulexperiments,suchasthenewapplicationsofCCDdigitalcameras,imageandgraphprocessingsoftwarepackages(CAD,Photoshop,Photomodeler,Vexcel,etc.)tothearchitecturesarealsopresented.Thesemethodsintroducedinthispaperaresuitableforimageandgraphintegrateddatabasebuildingofcomplicatedarchitectures,andusefulforconvenientlymaintainingandreconstructingtheancientarchitectures.
简介:Thispaperintroducestheprocessofmaking3DvectorscenographofanancientbuildingwithlargequantitiesofdatawiththeaidofAutoCAD,whichdisplaystheeffectofscenerydrawings.ThevitalskillsandtechniqueinvolvedareillustratedthroughtheexampleofPagodaofThousandsofBuddhainChiLinNunneryinHongKong.Thisconstructionwasstartedin1996andfinishedin1999withtheconcretestructureinternalandwoodexternal,imitatingthestyleofbuildingsinTangDynasty.Thus,3Dvectorscenographbecomeavailabletousers.
简介:这份报纸为为在不同网络系统和大楼结构之间的互相依赖建模描述一个框架。它由描述一个框架为基础结构互相依赖和他们的复杂行为建模并且模仿为内部大楼实用程序的综合分析提供一条途径。支持能使用象提供内部实用程序的地点和说明给一个技术员那样的格,这是想要动一个维护手术的一个基于图的空间模型。这个地点能为维护或代替被需要,或在另一个实用程序网络上组织调查大楼的损坏的结果,或沿着实用程序服务系统在不同地点估计不同维护操作的效果。模型说明二个重要方面:首先,在内部实用程序之间的关系和大楼元素或空格和秒,实用程序联网到的造的层次结构被联系。大楼的一个合适的层次被开发它支持对内部实用程序的面向人的描述的产生,在为象一个方法一样的大大楼元素和空格的分区的一个方法被开发引用一个网络元素到另一座大楼的地方。不同实用程序网络系统和大楼的连接用关节被产生,它基于一种抑制关系。一个例子被举它为支持在维护操作地点和另外的网络系统之间的维护操作,以及独立显示出这条途径的有效性。纸论述数据模型并且与造模型标准的当前的3D解释连接。
简介:在这份报纸,我们在身体上正在坐在不同地方的很多可得到的空间数据来源的上下文为空间数据集成(SOA-SDI)建议面向服务的体系结构,并且基于SOA-SDI开发基于万维网的GIS系统,允许顾客应用程序到达,从那些可得到的空间数据的分析和现在的空间数据采购原料。建议建筑学逻辑地包括4层或部件;他们是多重数据供应商服务,数据集成的层,后端服务的层,和前端的层为空间数据表示的图形的用户接口(图形用户界面)。根据4-layeredSOA-SDI框架,WebGIS应用程序能快速被发布,它证明SOA-SDI有潜力减少软件开发的输入并且弄短开发时期。