Reconstruction of the Earth surface reflection coefficients from MODIS satellite measurements with allowance for radiation polarization
M.V. Tarasenkov, A.V. Zimovaya, V.V. Belov, M.V. Engel
V.E. Zuev Institute of Atmospheric Optics of Siberian Branch of the Russian Academy of Science, Tomsk, Russia
Keywords: атмосферная коррекция, коэффициент отражения земной поверхности, поляризация, метод Монте-Карло, atmospheric correction, Earth surface reflection coefficient, polarization, Monte Carlo method
Abstract
The algorithm of reconstruction of the Earth surface reflection coefficients with allowance for radiation polarization is considered. The algorithm was approbated for 5 channels of the MODIS device and three territories: south of the Tomsk region, Moscow region, and Irkutsk region. To estimate the error of the algorithm, test points in the center of coniferous large forest areas in summer season were used. Results obtained using the MOD09 algorithm with and without allowance for radiation polarization and results obtained without atmospheric correction are compared with measurement data considered to be reference ones. The comparison demonstrates that the average values obtained by the suggested algorithm with allowance for polarization are closer to the reference data than those obtained using the MOD09 NASA algorithm in the first, third, and fourth MODIS channels, and the difference on the same order of magnitude is observed in the second MODIS channel. In the eighth MODIS channel, one algorithm is preferable in some situations, and another algorithm is preferable in other situations.
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