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Surface and precipitation features are determined over a test site in central North America during January 1979 using the Nimbus-7 Scanning Multichannel Microwave Radiometer (SMMR). An algorithm that uses the 18-and 37-GHz vertical polarization measurements is developed that can identify and separate six specific geophysical parameters: dry snow, sea ice, flooded or very wet land, dry land, open water, and rain. The algorithm is applied to a sequence of SMMR passes over the test site, and changes in various features, which are presented as color maps of geophysical parameters, are discussed.
Ferraro et al. (Sat,) studied this question.