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ATMOSPHERIC CORRECTION, REFLECTANCE CALIBRATION AND BRDF CORRECTION FOR ADS40 IMAGE DATA

By U. Beisl A, J. Telaar B and M. V. Schönermark C

Abstract

A new radiometric workflow for ADS40 line scanner data has been developed and implemented. It includes now two additional atmospheric correction algorithms and an empirical BRDF correction. Both atmospheric correction algorithms are based on the radiation transfer equation by Kaufman and Sendra. The first method uses a dark target to determine the atmospheric haze. The key atmospheric quantities path radiance, upward and downward transmittance and spherical albedo are then calculated using a parametrisation for a specific atmosphere and aerosol type. The second method uses empirical approximations to calculate the gaseous absorption, Rayleigh and aerosol scattering. With the help of three free parameters (aerosol size, aerosol concentration, and single scattering albedo) the model can be adjusted to different atmospheres and aerosol types. The two methods have been verified with a set of ADS40 calibration flights over the same target with different visibilities. In-situ ground reflectance measurements of different targets were made. The calculated reflectance values were found to be in good agreement with the measured ones. The empirical correction of bidirectional reflection (BRDF) effects of the ground is performed using a modified Walthall model. RÉSUMÉ: Un nouveau flux de production radiométrique pour les données du capteur ADS40 a été développé et réalisé. Il consiste en deux algorithmes de correction atmosphérique et une correction BRDF empirique. Les deux algorithmes de correction atmosphérique sont basés sur l'équation de transfert de radiation par Kaufman et Sendra. La première méthode utilise une zone sombre pour déterminer la brume atmosphérique. Les principales quantités atmosphériques, (radiation diffuse de l’air, transmission ascendante, descendant

Topics: KEY WORDS, Multispectral, Modelling, Aerial, Calibration, Land Use Mapping, Atmosphere
Year: 2011
OAI identifier: oai:CiteSeerX.psu:10.1.1.183.7769
Provided by: CiteSeerX
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