简介：ThecurrentGIScanonlydealwith2-Dor2.5-Dinformationontheearthsurface.Anew3-Ddatastructureanddatamodelneedtobedesignedforthe3-DGIS.Thispaperanalyzesdiverse3-Dspatialphenomenafromminetogeologyandtheircomplicatedrelations,andproposesseveralnewkindsofspatialobjectsincludingcross-section,columnbodyanddigitalsurfacemodeltorepresentsomespecialspatialphenomenaliketunnelsandirregularsurfacesofanorebody.Anintegrateddatastructureincludingvector,rasterandobject-orienteddatamodelsisusedtorepresentvarious3-Dspatialobjectsandtheirrelations.Theintegrateddatastructureandobject-orienteddatamodelcanbeusedasbasestodesignandrealizea3-Dgeographicinformationsystem.

简介：在这篇论文，一个转变模型说出SARC(有限制状况的静态过滤器的调整)被介绍，它在理论和试穿更实际、更严密任何旋转角参数。转变过程被划分成4步：①t他原版和目标坐标能与错误被认为是观察；②严密公式第一被推出以便由四个普通的点的使用计算转变参数的第一近似，转变方程被线性化；③由SARC模型④计算七个转变参数的最可能的值和变化表明SARC的有效性，一个例子被给。

简介：Inthispaperareviewoncurrentresearchon3DCMispresented,andanalternativeapproachbyintegratingtheconceptsandtechniquesofobject-orientedmethodandComputerAidedDesign(CAD)issuggested.Throughtheapproachurbanspatialentitiesasobjectsareextracted,whicharerepresentedwithprimary3Delements(node,edge,faceandbody)andtheircombinations.Inthelightoftheconceptofobject,themethodsupportsthemultiplerepresentationofLevelofDetails(LOD).Moreimportantly,topologicalrelationshipsbetweenobjectsaredescribedsothat3Dtopologicaloperationscanbeimplemented.

简介：Inthispaper,twoalgorithmsarepresentedforgeneratingtwocodescanlistsofanN-dimensionalHilbertcell,andaformalproofofthebackwardencodingalgorithmisgiven.Onthebasisoftheself-simi-laritypropertiesofaHilbertcurve,thispapergivesanovelalgorithmforgeneratingastaticevolvementruletablethroughanalyzingaHilbertcell.Bylookingupthestaticevolvementruletable,theN-dimensionalHilbertmappingsareefficientlyimplemented.

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简介：Theresearchworkhasbeenseldomdoneaboutcloverleafjunctionexpressionina3-dimensionalcitymodel(3DCM).Themainreasonisthatthecloverleafjunctionisofteninacomplexandenormousconstruction.Itsmainbodyisbestraddleinair,andhasaerialintersectionsbetweenitsparts.Thiscomplexfeaturemadecloverleafjunctionquitedifferentfrombuildingsandterrain,therefore,itisdifficulttoexpressthiskindofspatialobjectsinthesamewayasforbuildingsandterrain.Inthispaper,authorsanalyzespatialcharacteristicsofcloverleafjunction,proposeanall-constraintpointsTINalgorithmtopartitioncloverleafjunctionroadsurface,anddevelopamethodtovisualizecloverleafjunctionroadsurfaceusingTIN.Inordertomanagecloverleafjunctiondataefficiently,theauthorsalsoanalyzedthemechanismof3DCMdatamanagement,extendedBLOBtypeinrelationaldatabase,andcombinedR-treeindextomanage3Dspatialdata.Basedonthisextension,anappropriatedatastructur

简介：以便解决动态重建和三维的地质的固体的本地更新问题，推理的拓扑学被用于三维的地质的建模。这能在实现3D推进相应的节自动化的水平由构造的地质的稳固的动态重建并且在3D上在拓扑学上推理弯了表面。这个方法成功地在南京城市里被使用了地质的建模和当模特儿的Zijin金矿。结果证明这个方法适应共面的节和非共面的节数据，并且改进3D的效率地质的建模。

简介：Thebasicmathematicmodels,suchasthestatisticmodel,thetime-serialmodel,thespatialdynamicmodeletc.,andsometypicalanalysismethodsbasedon3DCMareproposedanddiscussed.Afewtypicalspatialdecisionmakingmethodsintegratingthespatialanalysisandthebasicmathematicalmodelsarealsointroduced,e.g.Visualimpactassessment,dispersionofnoiseimmissions,basestationplanforwirelesscommunication.Inaddition,anewideaofexpectationoffurtherapplicationsandadd-in-valueserviceof3DCMispromoted.Asanexample,thesunshineanalysisisstudiedandsomehelpfulconclusionsaredrawn.

简介：3D(三维)进程模拟当前是关于碎片流动的研究的最挑战性的领域之一。大规模地面显示是最在碎片流动模拟的3D风景建设的基本任务。作为为碎片流动的主要扳机，降雨将实质地提高现实主义的感觉。在3D碎片流动模拟显示的地面和降雨为数字计算和图形的处理能力提出大挑战。在这篇论文，我们建议风景建模并且使变为集成认识到3D的GPU技术，LoD算法，和粒子系统。为算法建模并且显示的即时基于LoD的地面首先被介绍，然后一个粒子基于系统的降雨风景显示方法被实现。试验性的结果证明与建议途径展览显示的3D风景鸣性能和公平视觉效果，它为碎片流动灾难的整个过程模拟打一个稳固的基础。

简介：Thispaperistoadvancesomerelevanttechniquestosetupathree-dimensionalindustrialsurveyingsystemof'buildingblockstype',makinguseoftheelectronictheodolite,standardrulerandportablecomputer.

简介：一般来说，重建大楼的精确形状，我们为每座大楼需要至少一个立体声模型(二张相片)。然而，在大多数情况中，仅仅一张单个非公制的相片是可得到的，它是由一个业余运动员的通常获得的任何一个，例如一个旅游者，或从一份报纸或一张明信片。从一幅单个非公制的图象评估3D重建的有效性，当这被认为是，这研究借助于模拟法用一幅单个非公制的图象在X和Y方向在维的形状的精确性上分析目标深度的效果在大多数情况中，在记录并且记录大楼的数据收集的主要来源。