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• W2148529957 abstract "Soil moisture is important information in semiarid rangelands where vegetation growth is heavily dependent on the water availability. Although many studies have been conducted to estimate moisture in bare soil fields with Synthetic Aperture Radar (SAR) imagery, little success has been achieved in vegetated areas. The purpose of this study is to extract soil moisture in sparsely to moderately vegetated rangeland surfaces with ERS-2/TM synergy. We developed an approach to first reduce the surface roughness effect by using the temporal differential backscatter coefficient (Δσwet–dry0). Then an optical/microwave synergistic model was built to simulate the relationship among soil moisture, Normalized Difference Vegetation Index (NDVI) and Δσwet-dry0. With NDVI calculated from TM imagery in wet seasons and Δσwet–dry0 from ERS-2 imagery in wet and dry seasons, we derived the soil moisture maps over desert grass and shrub areas in wet seasons. The results showed that in the semiarid rangeland, radar backscatter was positively correlated to NDVI when soil was dry (mv<10%), and negatively correlated to NDVI when soil moisture was higher (mv>10%). The approach developed in this study is valid for sparse to moderate vegetated areas. When the vegetation density is higher (NDVI>0.45), the SAR backscatter is mainly from vegetation layer and therefore the soil moisture estimation is not possible in this study." @default.
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• W2148529957 date "2004-03-01" @default.
• W2148529957 modified "2023-09-27" @default.
• W2148529957 title "Soil moisture estimation in a semiarid rangeland using ERS-2 and TM imagery" @default.
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• W2148529957 doi "https://doi.org/10.1016/j.rse.2003.12.001" @default.
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