Vicarious calibration of VNIR/SWIR bands of ASTER
Vicarious calibration of VNIR/SWIR bands of ASTER
Vicarious calibration of VNIR/SWIR bands of ASTER
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Solar irradiance modelA solar irradiance model is used to convert theradiative transfer code results to absolute radianceP Selection <strong>of</strong> solar model has no impact on <strong>ASTER</strong> Level1B radiance! For ETM+, ALI, MODIS, and others, the solar model isimportant since these sensors have solar diffusers! AVIRIS has “forced” the MODTRAN model to match itslaboratory <strong>calibration</strong>P The two places where the solar model impact <strong>ASTER</strong> arein the vicarious <strong>calibration</strong> and atmospheric correctionP Must have consistency between the vicarious <strong>calibration</strong>and atmospheric correction if vicarious <strong>calibration</strong> is usedto adjust <strong>calibration</strong> coefficientsP Will be problems when a user decides to atmosphericallycorrect their own data using an inconsistent solar model
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