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Radar backscatterring from soils under different agricultural crops and moisture conditions has been measured during the LOTREX campaign (Land-Surface Transverse Experiment, 26 June-21 July 1989) in north western Germany. LOTREX is part of the International Satellite Land-Surface Climatology Project (ISLSCP). Measurements were made with a four-band coherent Dopplcr scatterometer in L-, C-, X- and Ku -band at cross- and like-polarizations. The backscatlered radar signals were compared with in situ soil moisture data. It is found that the scatterometer data can clearly be related to soil moisture only at L-band frequencies. Here, a significant correlation with soil moisture exists irrespective of the crop type. The results do not show any distinctive dependency on the polarization used.
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Schmullius et al. (1992) studied this question.
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