摄影测量学LIDAR

AirborneLIDAR,内容,1.航空LIDAR基本知识及原理2.航空LIDAR应用领域,AirborneLIDAR(机载激光雷达),LIDAR是一种集激光,全球定位系统和惯性导航系统三种技术与一体的空间测量系统。是一种新型传感器，具有十分广泛的应用范围和应用前景。其应用已超出传统测量、遥感所覆盖的范围，成为一种独特的数据获取方式。,AirborneLIDAR,原理(Principles)设备(Equipment)特点(Features),LidarPrinciples,ScanningmirrorsweepslaserbeamacrossthegroundRangetotargetisdeterminedbymeasuringtimeintervalbetweenoutgoingandreturnofreflectedlaserpulseAircraftpositionisdeterminedusingGPSphasedifferencingtechniquesPointingdirectionoflaserdeterminedwithInertialMeasuringUnit(IMU)andrecordingofmirrorpositionDatastreamsrecordedandsynchronizedtoprocess,Equipment,POS系统(GPS/IMU)激光器激光信号接收装置计算机飞机,ALS50-II,InstallationFalconII,FalconIImountedinaPiperSeneca,TopoSysCorp.,InstallationHarrier56,TestinstallationPartenavia,TopoSysCorp.,AirborneLIDARSampleData,DigitalCanopyModel,AirborneLIDAR的特点,提供密集的点阵数据(点间距可以小于1米);能够穿透植被的叶冠;不需要或很少需要进入测量现场;可同时测量地面和非地面层;数据的绝对精度在0.30米以内;24小时全天候工作;具有迅速获取数据的能力。,LIDARDataSource,Firstreturn,Lastreturn,Laserreturnshitvariouspartsofthecanopy,Multiplereturns,LidarIntensityimagery:Magnitudeoftheresponses,IntensityData,LidarData,GreyscaleIntensityImage,Courtesy:http:/www.optech.on.ca/,CincinnatiAirportAerialPhoto,CincinnatiAirportIntensityPlot,Verticalbetterthan15cmat1,200mbetterthan35cmat3,000mHorizontalbetterthan1/2,000 xaltitude,Accuracy,ButtonvilleAirport,Toronto,Canada(FlightPathObstructionIdentification),Application,DEM提取道路，电力线海岸测量城市建模海洋测量,ElevationdataClassifiedGround-OnlyData,Landed5pmMapped11pm6HOUSR!,1.5hrstosurvey350,000pts,USGSDEMLidarDEM,LIDARUsedinTransportation,/./august/highlight.html,PowerLines,DigitalSurfaceModels(DSM)For3GWirelessCommunication,/stories/s798.htm,矢量数据采集和3D