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<strong>ASTER</strong> Users HandbookThis <strong>ASTER</strong> polar data product also provides complementary validation to the global-scale polardata and cloud property retrievals from MODIS. In particular, this data set will be used to crossvalidatethe MODIS cloud optical thickness and effective particle sizes which directly impact theEarth's radiative budget. In addition, only <strong>ASTER</strong> has the spatial resolution necessary to fullyanalyze the three-dimensional effects of clouds.ConstraintsThe daytime classification algorithm expects as input all the <strong>ASTER</strong> channels. Furthermore, thealgorithm expects the gain selections for VNIR and SWIR channels to be both “LOW”. Thealgorithm has not been applied to data with other gain selections.The nighttime algorithm utilizes only the thermal infrared channels as input. Furthermore, thenighttime algorithm is developed by using only thermal infrared channels of daytime images.This is due to the fact that the human experts are less confident in classifying thermal infraredimages by visual inspection. Therefore, daytime images are used to create training data sets forthe classifier.111
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