[en] Accurate, high-resolution soil moisture data is essential for hydrology, agriculture, and climate monitoring. However, existing satellite missions like SMAP offer limited spatial detail (~40 km) and revisit times of 2–3 days. GNSS-R, using signals from missions like CYGNSS and Spire, provides an alternative with higher spatial resolution, daily coverage, and lower cost. This study addresses the limitations of current soil moisture products by fusing SMAP data with GNSS-R observations to generate daily soil moisture maps at 3- and 9-km resolution.
