Atmospheric Corrections Using MODTRAN for TOA and Surface BRDF Characteristics from High Resolution Spectroradiometric/Angular Measurements from a Helicopter Platform-中国期刊网

摘要 High-resolutionspectralradiancemeasurementsweretakenbyaspectralradiometeronboardahelicopterovertheUSOklahomaSouthernGreatPlainneartheAtmosphericRadiationMeasurements(ARM)siteduringAugust1998.Theradiometerhasaspectralrangefrom350nmto2500nmat1nmresolution.Themeasurementscoveredseveralgrassandcroplandscenetypesatmultiplesolarzenithangles.DetailedatmosphericcorrectionsusingtheModerateResolutionTransmittance(MODTRAN)radiationmodelandin-situsoundingandaerosolmeasurementshavebeenappliedtothehelicoptermeasurementsinordertoretrievethesurfaceandtopofatmosphere(TOA)BidirectionalReflectanceDistributionFunction(BRDF)characteristics.Theatmosphericcorrectionsaremostsignificantinthevisiblewavelengthsandinthestrongwatervaporabsorptionwavelengthsinthenearinfraredregion.AdjustingtheBRDFtoTOArequiresalargercorrectioninthevisiblechannelssinceRayleighscatteringcontributessignificantlytotheTOAreflectance.Theoppositecorrectionstothevisibleandnearinfrarredwavelengthscanaltertheradiancedifferenceandratiothatmanyremotesensingtechniquesarebasedon,suchasthenormalizeddifferencevegetationindex(NDVI).ThedatashowthatsurfaceBRDFsandspectralalbedosarehighlysensitivetothevegetationtypeandsolarzenithanglewhileBRDFatTOAdependsmoreonatmosphericconditionsandtheviewinggeometry.ComparisonwiththeCloudsandtheEarth＇sRadiantEnergySystem(CERES)derivedclearskyAngularDistributionModel(ADM)forcropandgrassscenetypeshowsastandarddeviationof0.08inbroadbandanisotropicfunctionat25°solarzenithangleand0.15at50°solarzenithangle,respectively.

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Atmospheric Corrections Using MODTRAN for TOA and Surface BRDF Characteristics from High Resolution Spectroradiometric/Angular Measurements from a Helicopter Platform

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Atmospheric Corrections Using MODTRAN for TOA and Surface BRDF Characteristics from High Resolution Spectroradiometric/Angular Measurements from a Helicopter Platform

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