On the Synergy between Optical and TIR Observations for the Retrievals of Soil Moisture Content: Exploring Different Approaches

During the past century, scientists have developed several approaches on remote sensing strategies for estimating surface soil moisture. Soil moisture is one of the most relevant surface parameters that influences the Earth energy budget and hydrological process (Kerr 2007). Moreover, surface soil moisture is a key variable in describing the water and energy exchanges at the land surface-atmosphere interface (Wigneron et al. 2003).