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Joint field experiment of microwave and visible sensors for bare soil and vegetation and preliminary analysis

A joint field experiment was carried out using microwave and visible sensors for bare soil and vegetation in Shunyi of Beijing in May 2001. The sensors include a microwave radiometer, microwave scatterometer and visible and infrared spectrometer. The microwave radiometer operates in the L, C and K band with H and V polarizations. The microwave scatterometer operates in the C band with HH, HV, VH, VV polarizations. The microwave brightness temperature, backscatter coefficients and reflectivity of bare soil, winter wheat and alfalfa were measured at various incidence angles. Meanwhile, ground surface parameters such as soil surface roughness, soil moisture and temperature of various depths, LAI of winter wheat and alfalfa were measured at the same time. The measured data were analyzed and an algorithm based on synergistic use of all these data is put forward to estimate soil moisture.