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A decision tree algorithm was developed to classify the surface soil frozen/thawed status based on the microwave emission and scattering characteristics of the frozen/thawed soil, and the cluster analysis of samples from the frozen soil, the thawed soil, the desert and the snow. The decision tree works with five SSM/I channels (19V, 19H, 22V, 37V, 85V) and three dominant indices, including the scattering...
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