ESA CCI Soil Moisture Combined Product

ESA CCI Soil Moisture Combined Product is a Level-3 long-term soil moisture climate data record, produced under the ESA Climate Change Initiative. The current release is version v09.2.^[1]

Spatial resolution is 0.25 degree (approximately 25 km at the equator). Temporal coverage extends from 1978-11-01 to 2024-12-31, providing one of the longest multi-sensor soil moisture records available. The dataset combines 17 satellite sensors: 5 active microwave instruments (including ASCAT-A, ASCAT-B, ASCAT-C, and ERS-1/2 scatterometers) and 12 passive microwave instruments (including SSM/I, TMI, AMSR-E, AMSR2, SMOS, WindSat, and GMI).^[2] The full enumerated sensor list for v09.2 is documented in the ATBD (Zenodo record 13860922).^[2]

Output is daily global composites in NetCDF format, CF-convention compliant. Pre-2000 data derive from ERS-based sensors only and carry lower quality flags.^[2] Version v09.2 introduced updated SMOS incidence angle corrections.

The archive is accessible at data.ceda.ac.uk/neodc/esacci/soil_moisture and via the ESA Open Data Portal. Access is free without registration.^[3]