3S技术在水利工程中的应用-遥感.ppt

RemoteSensing遥感,RemoteSensingSystems1.Passive,StructureIntroductionCamerasScanningradiometersCCDarraysImagingspectroscopyConclusions,StructureIntroductionCamerasScanningradiometersCCDarraysImagingspectroscopyConclusions,RemoteSensingSystems1.Passive,IntroductionRemotesensingsystemsusethreedifferentsourcesofradiation,RemoteSensingSystems1.Passive,IntroductionRemotesensingsystemsusethreedifferentsourcesofradiationReflectedsolarradiationEmittedthermalormicrowaveradiationArtificalradiationAvarietyofinstrumentscanbeusedtosampleandmeasurethisradiationThesecanbeeitherpassivesimplysamplesambientEMR,oractivegeneratesownartificialERM,RemoteSensingSystems1.Passive,StructureIntroductionCamerasScanningradiometersCCDarraysImagingspectroscopyConclusions,RemoteSensingSystems1.Passive,CamerasPassivesystemDevicetofocusEMRtoanimageontosensitivefilmAnalogoustohumaneye,RemoteSensingSystems1.Passive,CamerasMainsystemforaerialphotography,RemoteSensingSystems1.Passive,CamerasAlsoonmannedorbitalmissionssuchasSpaceShuttle,RemoteSensingSystems1.Passive,CamerasAlsoonmannedorbitalmissionssuchasSpaceShuttleCairofromtheSpaceShuttle,RemoteSensingSystems1.Passive,CamerasAdvantagesHigherspatialresolutionthanothersystemsforanygivenaltitudeDisadvantagesRetrioffilminsatellitemissionsisproblematic,RemoteSensingSystems1.Passive,StructureIntroductionCamerasScanningradiometersCCDarraysImagingspectroscopyConclusions,RemoteSensingSystems1.Passive,RemoteSensingSystems1.Passive,Scanningradiometers扫描辐射仪）PassivesystemProducesdigitalimages,ScanningradiometersMirrorscansacross-trackswath,,,,RemoteSensingSystems1.Passive,Scanningradiometers2-Dimageedbyplatforwardmotion,,RemoteSensingSystems1.Passive,ScanningradiometersMultiplespectralbandssampledsimultaneously,,RemoteSensingSystems1.Passive,ScanningradiometersAdvantagesDigitaldatacanbetelemeteredtoEarthDataaremachinereadableDatacanbemultispectralDisadvantagesLimitedspatialresolutionDistortionandnoise,RemoteSensingSystems1.Passive,ScanningradiometersExamplesLandsatThematicMapperDeathValley,California,RemoteSensingSystems1.Passive,ScanningradiometersExamplesNOAAAVHRR（AdvancesVeryHighResolutionRadiometerScandinavia,RemoteSensingSystems1.Passive,StructureIntroductionCamerasScanningradiometersCCDarraysImagingspectroscopyConclusions,RemoteSensingSystems1.Passive,CCDarrays线阵列推扫式扫描仪）PassivesystemLineorblockofCCDsinsteadofscanningmirrorSensesentireswathorblocksimultaneously,RemoteSensingSystems1.Passive,CCDarraysAdvantagesSmall,lowpower,cheapLonglifenomovingpartsHighgeometric/radiometricaccuracyHighspatialresolutionDisadvantagesManydetectorstocalibrateLimitedspectralrangeofCCDs,RemoteSensingSystems1.Passive,CCDarraysExamplesSPOT,RemoteSensingSystems1.Passive,CCDarraysExamplesMOMS,RemoteSensingSystems1.Passive,CCDarraysExamplesIKONOS,RemoteSensingSystems1.Passive,StructureIntroductionCamerasScanningradiometersCCDarraysImagingspectroscopyConclusions,RemoteSensingSystems1.Passive,Imagingspectroscopy（成象分光计）,Complexopticsandelectronics,Imagingspectroscopy,,,RemoteSensingSystems1.Passive,ImagingspectroscopyManymorenarrowspectralbandshyperspectralCanresolveindividualmineralabsorptionsMostlyusedforgeologyorvegetationhealthstudiesMostlyairbornesystems,butexperimentalsystemHyperionflownonEO-1satellitemission,RemoteSensingSystems1.Passive,ImagingspectroscopyStrengthsExcellentfordiagnosticmappingSensitivetosubtlespectralfeaturesWeaknessesVerylargedatasetsSignal-to-noise（信噪比）lowonsomesystems,RemoteSensingSystems1.Passive,ImagingspectroscopyExamplesHyMapinfraredimageofMtFitton,SouthAustralia,RemoteSensingSystems1.Passive,ImagingspectroscopyExamplesAVIRISdataofJasperRidge,California,displayedasahyperspectraldatacube,RemoteSensingSystems1.Passive,ImagingspectroscopyExamplesMineralmapofCuprite,Nevada,fromAVIRIShyperspectraldata,RemoteSensingSystems1.Passive,StructureIntroductionCamerasScanningradiometersCCDarraysImagingspectroscopyConclusions,RemoteSensingSystems1.Passive,ConclusionsPassiveremotesensingsystemsmeasureambientEMRTheyuseopticalsystemstelescopes,prisms,mirrorsetc.tosplitandfocusupwellingradianceontodetectorsorfilmTheycanbeclassifiedintocameras,scanners,CCDarraysandhyperspectralsystems,dependingontheconfigurationofopticsandelectronics,RemoteSensingSystems1.Passive,