“…The application of remote sensing techniques in hydrological studies and water resources management has progressed in the past decades (see review by Kite and Pietroniro, 1996). In general, remote sensing data are used in the following ways (Ritchie and Rango, 1996;Kite and Pietroniro, 1996;Schultz, 1996): (i) original remote sensing imagery is directly used to identify hydrologically significant areal phenomena, such as flooded areas (Barber et al, 1997;Brivio et al, 2002;Islam and Sado, 2002), snow cover (Baumgartner and Apfl, 1994;Tait et al, 2000) or plumes (Ouillon et al, 1997); (ii) processed remote sensing data are used to provide fields of hydrological parameters, such as precipitation (Kite and Pietroniro, 1996;Wang et al, 2001), and soil moisture (Jackson, 1993;Hollenbeck et al, 1996;Kim and Barros, 2002). This requires the understanding and development of relationships between electromagnetic signals and hydrological parameters of interest; and (iii) multispectral remote sensing data are used to quantify surface parameters, such as vegetation (land cover) types and density.…”