Soil Moisture and Remote Sensing

Soil moisture—the water held in the upper layers of land—governs how rainfall becomes runoff, how crops grow, and how heat moves between the ground and atmosphere, yet measuring it consistently across the globe has long been a practical challenge. Satellites equipped with microwave sensors now offer a way to estimate soil moisture from orbit by detecting how wet soil emits and reflects radiation, and researchers combine these observations with hydrological models through data assimilation to produce spatially continuous, regularly updated maps. A central difficulty is that satellite retrievals capture a coarse, area-averaged signal while actual moisture varies sharply over short distances due to soil type, vegetation, and topography—reconciling that spatial mismatch remains an active problem. Work in this area also focuses on validating satellite-derived estimates against ground measurements and understanding how errors propagate into downstream predictions of drought, flood risk, and water availability.

Works

356,579

Total citations

689,472

Keywords

Remote SensingSoil MoistureSatellite ObservationsData AssimilationHydrological ModelingGlobal Monitoring