《无人机行业应用（双语）》课件-15.使用大疆智图进行空三加密与模型重建

使用大疆智图进行空三加密与模型重建-UseDJIZhituforspacetripletencryptionandmodelreconstruction--《无人机行业应用》-"UnmannedAerialVehicleIndustryApplications"Keyknowledge重点知识掌握使用大疆智图软件进行空三加密和模型重建的完整流程MasterthecompleteprocessofusingDJIZhitusoftwareforaerialtripletencryptionandmodelreconstructionKeyknowledge重点知识理解关键参数设置对成果质量的影响UnderstandtheimpactofkeyparameterSettingsonthequalityoftheoutcome壹空三加密原理与流程Theprincipleandprocessofspacethreeencryption空三加密原理与流程Theprincipleandprocessofspacethreeencryption空三加密的全称是空中三角测量加密。Thefullnameofaerialtriangulationencryptionisaerialtriangulationencryption.Thebridgeconnectingtheoriginalimageandthefinaloutcome连接原始影像和最终成果的桥梁这个过程的本质是通过计算机视觉技术，自动识别相邻影像中的共同特征点。Theessenceofthisprocessistoautomaticallyidentifycommonfeaturepointsinadjacentimagesthroughcomputervisiontechnology.空三加密原理与流程Theprincipleandprocessofspacethreeencryption空三加密的全称是空中三角测量加密。Thefullnameofaerialtriangulationencryptionisaerialtriangulationencryption.Thebridgeconnectingtheoriginalimageandthefinaloutcome连接原始影像和最终成果的桥梁构建一个覆盖整个测区的特征点网络，从而恢复出每张影像的精确外方位元素。Constructafeaturepointnetworkcoveringtheentiresurveyareatorestorethepreciseoutwardorientationelementsofeachimage.空三加密原理与流程TheprincipleandprocessofspacethreeencryptionFeaturepointextraction特征点提取Thesoftwarewilldetectthefeaturepointsineachimage软件会检测每张影像中的特征点Thehumaneyecanrecognizeobviousfeaturesofbuildingssuchascornerpointsandwindowedgesinthesameway人眼识别建筑物角点、窗户边缘等明显特征一样空三加密原理与流程TheprincipleandprocessofspacethreeencryptionFeaturepointmatching特征点匹配软件会在重叠的影像间寻找相同的特征点，建立连接点网络。Thesoftwarewillsearchforthesamefeaturepointsamongoverlappingimagesandestablishanetworkofconnectionpoints.Thedensityandaccuracyofthenetworkdirectlydeterminethequalityofsubsequentmodeling网络的密度和精度直接决定了后续建模的质量空三加密原理与流程Theprincipleandprocessofspacethreeencryption需要根据测区特点选择合适的计算模式。Theappropriatecalculationmodeneedstobeselectedbasedonthecharacteristicsofthesurveyarea.Normalmode普通模式适用于大多数正射和倾斜摄影场景。Itissuitableformostorthophotoandobliquephotographyscenarios.Surroundmode环绕模式针对细高物体如铁塔、风力发电机优化。Optimizedfortallandslenderobjectssuchasirontowersandwindturbines.Powerlinemode电力线模式专门为电力巡检的Z字型航线设计。DesignedspecificallyfortheZ-shapedrouteofpowerinspection.选择正确的模式能够显著提高计算效率和成果质量。Choosingthecorrectmodecansignificantlyimprovecomputingefficiencyandthequalityofresults.贰模型重建操作流程Modelreconstructionoperationprocess模型重建操作流程Modelreconstructionoperationprocess模型重建是将空三加密成果转化为可视化模型的过程。Modelreconstructionistheprocessoftransformingtheresultsofspace-threeencryptionintoavisualmodel.Two-dimensionalreconstruction二维重建Three-dimensionalreconstruction三维重建Theyrespectivelycorrespondtodifferentproductrequirements.分别对应不同的产品需求模型重建操作流程ModelreconstructionoperationprocessDigitalsurfacemodel数字表面模型Two-dimensionalreconstruction二维重建Orthophotoimage正射影像图启动重建前，需要设置正确的坐标系和输出范围。Beforestartingthereconstruction,itisnecessarytosetthecorrectcoordinatesystemandoutputrange.坐标系必须与项目要求一致，输出范围可以通过绘制多边形或导入KML文件来精确界定。Thecoordinatesystemmustbeconsistentwiththeprojectrequirements.TheoutputrangecanbepreciselydefinedbydrawingpolygonsorimportingKMLfiles.模型重建操作流程ModelreconstructionoperationprocessDigitalsurfacemodel数字表面模型Two-dimensionalreconstruction二维重建Orthophotoimage正射影像图同时要设置合适的地面分辨率。Atthesametime,anappropriategroundresolutionshouldbeset.过高的分辨率会增加计算负担。Excessivelyhighresolutionwillincreasethecomputationalburden.过低则影响成果质量。Ifitistoolow,itwillaffectthequalityoftheoutcome模型重建操作流程Modelreconstructionoperationprocess三维重建能够生成真实的实景三维模型。Three-dimensionalreconstructioncangeneraterealisticthree-dimensionalmodelsofrealscenes.在重建设置中，需要选择模型格式和纹理质量。InthereconstructionSettings,themodelformatandtexturequalityneedtobeselected.常用的OSGB格式适用于本地浏览，3DTiles格式更适合网络发布。ThecommonlyusedOSGBformatissuitableforlocalbrowsing,whilethe3DTilesformatismoresuitableforwebpublishing.纹理质量设置需要在清晰度和文件大小之间取得平衡。TexturequalitySettingsneedtostrikeabalancebetweenclarityandfilesize.模型重建操作流程Modelreconstructionoperationprocess三维重建能够生成真实的实景三维模型。Three-dimensionalreconstructioncangeneraterealisticthree-dimensionalmodelsofrealscenes.在重建设置中，需要选择模型格式和纹理质量。InthereconstructionSettings,themodelformatandtexturequalityneedtobeselected.常用的OSGB格式适用于本地浏览，3DTiles格式更适合网络发布。ThecommonlyusedOSGBformatissuitableforlocalbrowsing,whilethe3DTilesformatismoresuitableforwebpublishing.通常建议选择中等以上质量以保证模型视觉效果。Itisusuallyrecommendedtochooseamediumorhigherqualitytoensurethevisualeffectofthemodel.叁实战技巧与质量控制Practicalskillsandqualitycontrol实战技巧与质量控制PracticalskillsandqualitycontrolThecorrectuseofimagecontrolpointsisthekeytoensuringaccuracy像控点的正确使用是保证精度的关键需要在软件中准确输入像控点坐标。Thecoordinatesoftheimagecontrolpointsneedtobeaccuratelyinputinthesoftware.通过刺点操作将控制点与影像上的实际位置对应起来。Thecontrolpointsarematchedwiththeactualpositionsontheimagethroughtheprickoperation.刺点精度直接影响最终成果的绝对精度。Theaccuracyofthepuncturepointsdirectlyaffectstheabsoluteaccuracyofthefinaloutcome.建议每个像控点至少在3张影像上进行刺点。Itisrecommendedthatatleastthreeimagecontrolpointsbeplacedoneachimage.实战技巧与质量控制PracticalskillsandqualitycontrolThefailureofaflightthreeisacommontechnicalproblem空三失败是常见的技术难题检查影像质量，剔除模糊、过曝的影像。Checktheimagequalityandremoveblurryoroverexposedimages.检查重叠度是否达标，特别是旁向重叠是否足够。Checkwhethertheoverlapdegreemeetsthestandard,especiallywhetherthelateraloverlapissufficient.调整特征点密度和匹配策略。Adjustthedensityoffeaturepointsandthematchingstrategy.在复杂场景下适当提高特征点密度。Appropriatelyincreasethedensityoffeaturepointsincomplexscenarios.实战技巧与质量控制PracticalskillsandqualitycontrolThehandlingofmodelflawsrequirestargetedstrategies模型瑕疵的处理需要针对性策略对于模型拉花、变形问题，通常需要检查该区域的影像覆盖是否充分，考虑补充拍摄。Forissuessuchasmodeldecalsanddeformations,itisusuallynecessarytocheckwhethertheimagecoverageofthatareaissufficientandconsidersupplementaryshooting.实战技巧与质量控制Practicalskillsandqualitycontrol对于纹理模糊、缺失，可能是拍摄时光照不均或镜头污渍导致，需要重新处理或修复影像。Forblurredormissingtextures,itmightbecausedbyunevenlightingduringshootingorlensstains,andtheimageneedstobereprocessedorrepaired.Thehandlingofmodelflawsrequirestargetedstrategies模型瑕疵的处理需要针对性策略实战技巧与质量控制PracticalskillsandqualitycontrolThequalityinspectionoftheoutcomeisthefinalcrucialstep成果质量检查是最后的关键步骤Geometricaccuracy几何精度Visualeffect视觉效果几何精度通过检查点验证，对比模型上的坐标值与实测值的差异。Thegeometricaccuracyisverifiedthroughcheckpoints,andthedifferencesbetweenthecoordinatevaluesonthemodelandthemeasuredvaluesarecompared.实战技巧与质量控制Practicalskillsa