《无人机行业应用（双语）》课件-9.低空摄影测量原理与坐标系认知

低空摄影测量原理与坐标系认知-PrinciplesofLow-altitudePhotogrammetryandUnderstandingofCoordinatesystems--《无人机行业应用》-"UnmannedAerialVehicleIndustryApplications"Keyknowledge重点知识建立低空摄影测量的基础理论框架Establishthebasictheoreticalframeworkoflow-altitudephotogrammetry深入理解其工作原理和核心的坐标系概念Gainathoroughunderstandingofitsworkingprincipleandthecoreconceptofthecoordinatesystem壹摄影测量基本原理Thebasicprinciplesofphotogrammetry摄影测量基本原理ThebasicprinciplesofphotogrammetryThetechnologyofreconstructingthree-dimensionalspatialinformationbyusingtheseoverlappingimages利用这些重叠的影像来重建三维空间信息的技术低空摄影测量是通过无人机搭载的相机，从空中对地表进行连续拍摄。Low-altitudephotogrammetryisthecontinuousshootingofthegroundsurfacefromtheairbythecameracarriedbytheunmannedaerialvehicle.理解这一过程的核心原理，是掌握后续所有航测技能的前提。Understandingthecoreprincipleofthisprocessistheprerequisiteformasteringallsubsequentaerialsurveyingskills.摄影测量基本原理Thebasicprinciplesofphotogrammetry像点位移原理。Liketheprincipleofpointdisplacement.拍摄角度和地形的变化，同一地物在不同照片上会呈现不同的位置。Thechangesinshootinganglesandterrainwillcausethesameobjecttoappearindifferentpositionsindifferentphotos.Richinformationonterrainundulations丰富的地形起伏信息反演出地物的三维坐标。Reversethethree-dimensionalcoordinatesofthegroundobject.摄影测量基本原理Thebasicprinciplesofphotogrammetry像点位移原理。Liketheprincipleofpointdisplacement.Three-dimensionalobservation立体观测通过两张有重叠的影像，可以构建立体模型，实现高程信息的精确提取。Byusingtwooverlappingimages,athree-dimensionalmodelcanbeconstructedtoachievepreciseextractionofelevationinformation.摄影测量基本原理ThebasicprinciplesofphotogrammetryCourseoverlapisusuallysetat70%-80%航向重叠通常设置为70%-80%影像重叠度的概念TheconceptofimageoverlapThelateraloverlapis60%to70%旁向重叠为60%-70%这样的设置确保了每个地物都能在多张影像上出现，为后续的空三计算提供足够的数据支持。Suchasettingensuresthateachgroundobjectcanappearonmultipleimages,providingsufficientdatasupportforsubsequentaerialtriangulationcalculations.摄影测量基本原理ThebasicprinciplesofphotogrammetryCourseoverlapisusuallysetat70%-80%航向重叠通常设置为70%-80%影像重叠度的概念TheconceptofimageoverlapThelateraloverlapis60%to70%旁向重叠为60%-70%看似简单的参数设置，直接影响着最终成果的精度和质量。Whatseemslikeasimpleparametersettingdirectlyaffectstheaccuracyandqualityofthefinaloutcome.贰坐标系系统详解DetailedExplanationoftheCoordinateSystem坐标系系统详解DetailedExplanationoftheCoordinateSystem坐标系是连接影像数据和真实世界的数学基础。Thecoordinatesystemisthemathematicalfoundationthatconnectsimagedatawiththerealworld.准确理解不同坐标系的特点和应用场景。Accuratelyunderstandthecharacteristicsandapplicationscenariosofdifferentcoordinatesystems.确保成果精度的关键。Thekeytoensuringtheaccuracyoftheoutcome.坐标系系统详解DetailedExplanationoftheCoordinateSystemWGS84andCGCS2000WGS84和CGCS2000大地坐标系（Geodeticcoordinatesystem）描述地球上任意点位置的全球统一坐标系。AgloballyunifiedcoordinatesystemthatdescribesthepositionofanypointontheEarth.坐标系系统详解DetailedExplanationoftheCoordinateSystemGauss-krugerprojectionandUTMprojection高斯-克吕格投影和UTM投影投影坐标系（Projectioncoordinatesystem）将椭球面上的点投影到平面上，减小了变形误差。Projectingthepointsontheellipsoidsurfaceontotheplanereducesthedeformationerror.坐标系系统详解DetailedExplanationoftheCoordinateSystemThetransformationrelationshipamongthecameracoordinatesystem,theimageplanecoordinatesystemandthegroundcoordinatesystem相机坐标系、像平面坐标系和地面坐标系之间的转换关系转换过程需要通过精确的相机标定参数来实现。Theconversionprocessneedstobeachievedthroughprecisecameracalibrationparameters.Focallength焦距Likethepositionofthemainpoint像主点位置Lensdistortionparameters镜头畸变参数任何一个参数的误差，都会在成果中放大数十倍甚至数百倍。Theerrorofanyparameterwillbemagnifiedtensorevenhundredsoftimesintheoutcome.叁精度影响因素分析AnalysisofFactorsAffectingAccuracy精度影响因素分析AnalysisofFactorsAffectingAccuracyTheaccuracyofaerialsurveyresultsiscomprehensivelyinfluencedbymultiplefactors航测成果的精度受到多种因素的综合影响Flightquality飞行质量飞行的稳定性Flightstability航线的直线度Thestraightnessoftheflightpath重叠度的一致性Consistencyofoverlapdegree一个微小的飞行偏差，就可能导致局部区域重叠度不足，影响后续处理。Aslightflightdeviationmayleadtoinsufficientoverlapinlocalareas,affectingsubsequentprocessing.精度影响因素分析AnalysisofFactorsAffectingAccuracy需要通过严格的标定来消除其影响。Needtobestrictlycalibratedtoeliminatetheirinfluence.Theaccuracyofaerialsurveyresultsiscomprehensivelyinfluencedbymultiplefactors航测成果的精度受到多种因素的综合影响Cameraparameters相机参数镜头的畸变程度Degreeoflensdistortion精度影响因素分析AnalysisofFactorsAffectingAccuracyEnvironmentalfactors环境因素光照条件的变化会影响影像的色调和纹理。Changesinlightingconditionscanaffectthetoneandtextureofanimage.大气的能见度和折射会引入误差，地物本身的纹理特征也会影响匹配的精度。Thevisibilityandrefractionoftheatmospherecanintroduceerrors,andthetexturefeaturesofthegroundobjectsthemselvescanalsoaffecttheaccuracyofmatching.在水面、雪地等缺乏纹理的区域，影像匹配的难度会显著增加。Inareaslackingtexturesuchaswatersurfacesandsnow,thedifficultyofimagematchingwillincreasesignificantly.精度影响因素分析AnalysisofFactorsAffectingAccuracyTargetedmeasuresshouldbetakenduringthetaskplanningandexecutionstage任务规划和执行阶段采取针对性的措施选择合适的光照时段飞行，在缺乏纹理的区域布设标志点，通过多个控制点来约束误差传播等。Selectappropriatelightingperiodsforflight,setupmarkerpointsinareaslackingtexture,andrestricterrorpropagationthroughmultiplecontrolpoints,etc.测绘工作者严谨求实的专业精神的体现。Theembodimentoftherigorousandrealisticprofessionalspiritofsurveyors.总结Summary扎实的理论基础是保证航测成果精度的根本。Asolidtheoreticalfoundationisthefundamentalguaranteefortheaccuracyofaerialsurveyresults.Anin-depthunderstandingoftheprinciplesofphotogrammetry摄影测量原理的深入理解这一整套知识体系体现了测绘工作所要求的严谨性和科学性。Thisentireknowledgesystemreflectstherigorandscientificnaturerequiredinsurveyingandmappingwork.Precisegraspofcoordinatesystemtransformation坐标系转换的精确把握Systematicanalysisofinfluencingfactors影响因素的系统分析在航测工作中，理论指导实践，细节决定成败。Inaerialsurveyingwork,theoryguidespracticeanddetailsdeterminesuc