Wetlands and open waters are key components of the hydrological and carbon cycles but their spatio-temporal dynamics are still not well known at global scale. Current paper presents a new methodology to retrieve water fraction at coarse scale and high temporal resolution (one week) using L-Band multi-angular and dual polarisation remote sensing data from SMOS mission. The dataset labeled G-SWAF (or Global-SWAF) is an extention of the SWAF approach which did not consider the separate contributions of the Soil, Vegetation and water fractions. The comparison to existing datasets shows more water fraction detecting in Tropical areas but better consideration of high latitudes is still needed to be included in future studies. The use of such datasets with the future data from the SWOT (NASA/CNES) mission will provide global evaluation of inland open water volumes at 10 days scale.