# ESA CCI Soil Moisture Combined Product
*data products*

## Specifications
- **level**: L3
- **distributor**: esa
- **gsd m**: {"native":25000}
- **access endpoint**: https://climate.esa.int/en/projects/soil-moisture/data/
- **access model**: open
- **licence**: ESA CCI open access; free without registration via CEDA Archive
- **cost model summary**: Free and open via CEDA Archive; global daily 0.25-degree multi-sensor climate data record 1978-2024
- **primary data portal url**: https://esa-soilmoisture-cci.org/
- **deployment context**: orbital
- **entity type**: data_product
- **last verified date**: 2026-05-31
- **verified by**: agency-doc
- **claim status**: agency-sourced
- **provider**: esa
- **attributes**: {"level":"L3","distributor":"esa","gsd_m":"{\"native\":25000}","access_endpoint":"https://climate.esa.int/en/projects/soil-moisture/data/","access_model":"open","licence":"ESA CCI open access; free without registration via CEDA Archive","cost_model_summary":"Free and open via CEDA Archive; global daily 0.25-degree multi-sensor climate data record 1978-2024","primary_data_portal_url":"https://esa-soilmoisture-cci.org/","deployment_context":"orbital"}

## Editorial
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.[^esa-cci-sm-data-page]

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).[^esa-cci-sm-atbd] The full enumerated sensor list for v09.2 is documented in the ATBD (Zenodo record 13860922).[^esa-cci-sm-atbd]

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.[^esa-cci-sm-atbd] 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.[^esa-cci-sm-ceda]

## Compositional position
- soil-moisture (topics) --[topic_capabilities]--> ESA CCI Soil Moisture Combined Product
- groundwater (topics) --[topic_capabilities]--> ESA CCI Soil Moisture Combined Product

## Sources
- [esa-cci-sm-data-page] | ESA CCI Soil Moisture v09.2 data page, ESA Climate Change Initiative | https://climate.esa.int/en/projects/soil-moisture/data/ | tier=agency-doc | accessed=2026-05-31
- [esa-cci-sm-atbd] | ESA CCI+ Soil Moisture ATBD v09.0, Zenodo | https://zenodo.org/records/13860922 | tier=operator-engineering | accessed=2026-05-31
- [esa-cci-sm-ceda] | ESA CCI Soil Moisture archive, CEDA | https://data.ceda.ac.uk/neodc/esacci/soil_moisture | tier=operator-engineering | accessed=2026-05-31

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Source: https://eo-atlas.org/data_products/esa-cci-soil-moisture
Maintainer: SpectraWorks B.V. (CC-BY 4.0)