A "superpixel" is made of nine (3x3) POLDER full resolution pixel. This number can be reduced to up to five if there are some cloudy pixels among the nine pixels or near of coasts. The superpixel is considered as cloudy if it contains more than four cloudy pixels. The spectral Level 1 normalized radiances atributed to each viewing direction of the superpixel are computed as the mean value of the spectral Level 1 normalized radiances of the different pixels that contribute to the superpixel.
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