THE USE OF SENTINEL-1 FOR MONITORING OF SOIL MOISTURE WITHIN THE COPERNICUS GLOBAL LAND SERVICE

摘要

Within the Copernicus Global Land Service (CGLS), a global Soil Water Index (SWI) product is available on an operational basis, derived from the Metop Advanced Scatterometer (ASCAT) with a spatial sampling of 0.1°. The SWI quantifies the moisture condition at various depths in the soil. To match the spatial resolution of the SWI data with the rest of the CGLS data products, the 1 km Sentinel-1 (S-1) surface soil moisture (SSM) product can be used. The S-1 SSM is retrieved by inverting a backscatter model trained using historic SAR observations. Here, the progress made in delivering the 1 km fused SWI as well as the 1 km S-1 SSM products at the Earth Observation Data Centre for Water Resources Monitoring (https://www.eodc.eu/) is reported. The first validation results of the 1 km fused SWI are satisfying demonstrating well the added fine-scale spatial soil moisture signal.