The cloud adjacency effect (CAE) on retrieved values of ground surface reflectance is assessed. The assessment method employs the software for statistical simulation of radiation transfer in the atmosphere with a stochastic cloud field including a deterministic gap of a given radius, and then the simulated results are used in an interpolation formula. Masks of cloudless pixels, for which the cloud adjacency effect changes retrieved reflectances by values greater than 0.005, are constructed. The coefficients of correlation of the CAE radius with the initial data show that the major contributors are the cloud optical thickness, cloud cover index, and surface reflectance.
To validate the proposed algorithm for retrieving the reflection coefficients of the earth’s surface, the results of ground - based measurements at the test area with the coordinates 38.829°N, 8.791°W are compared with the results obtained with the proposed algorithm, the MOD09 algorithm, and the algorithm without atmospheric correction. The comparison shows a good agreement of the results yielded by the proposed and MOD09 algorithms with the ground measurements. The reflection coefficients for the area with the coordinates 38.4-39.3º N, 8.3-9.2º W on May 03, 2016, as retrieved by the proposed algorithm, the MOD09 algorithm, and the algorithm without atmospheric correction are analyzed. For the MODIS channels 1 and 2, the MOD09 algorithm gives negative values of the reflection coefficient for some pixels, while the proposed algorithm does not. The algorithm without atmospheric correction overestimates the reflection coefficient.
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