Abstract
Ground-base verification experiments for the soil moisture detection by spaceborne SARs (E ERS-1 and J ERS-1) were carried out. Backscattering coefficients obtained from satellite SARs were compared with those measured by ground-base scatterometer system and ground truth data of soil moisture, and the relationship between backscattering coefficients measured by SARs and soil moisture content was examined. Major results obtained from the study are as follows; (i) Backscattering coefficients measured by E ERS-1 AMI are not more sensitive to surface conditions than those by the scatterometer and have a high correlation with soil moisture content for the soil moisture range of less than 40 correlation with the saturation degree of soil moisture, but low sensitivity to it. (iii) Each land cover has its own seasonal change, which shows the possibility to classify land cover types from multitemporal SAR data. (iv) Using SAR data with visible satellite data, soil moisture distribution maps are made up and validated with qualitative observations.
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