Abstract
The estimation of apparent surface reflectance values from imaging spectroscopy data requires a correction for the effects of the intervening atmosphere. Three methods of estimating total water path content using radiative transfer modelling have been evaluated. To compare the accuracy of these estimation algorithms the derived total water path contents were used as inputs to an apparent surface reflectance estimation algorithm. A high albedo target, of known composition, was selected from the AVIRIS data to evaluate the accuracy of the corrections. Radiative transfer modelling using MODTRAN3 gave much more accurate corrections, compared to library spectra corresponding to target, than those calculated using MODTRAN2. A radiative transfer modelling technique to calculate the total water path length which uses a much larger number of spectral bands covering the two water vapour absorption features at 940 and 1130nm was found to give slightly improved correction. The effect of environmental reflectance on imaging spectrometry data in mapping altered rocks has been assessed. Environmental reflectance was found to decrease markedly from 400 to 1000nm and cause small but noticeable reductions in the diagnostic mineral absorption features.
Published Version
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