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Passive microwave remote sensing provide soil moisture product. The problem of validation of soil moisture products is that the true soil moisture of such a large pixel is difficult to estimate. This paper is a preliminary research on how to measure the true soil moisture of a 30m×30m quadrat. The results suggest that 20 measurement in such a quadrat should gave a reliable estimation of the soil moisture...
Soil moisture is an important variable in the process of water and energy exchanges at the land surface. Passive microwave remote sensing techniques have great potential for its frequent coverage, low data rates, and simpler data processing, but with poor spatial resolution, which resulted in sub-pixel heterogeneity. To study the effect of spatial heterogeneity of soil parameters on the retrieval...
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