# Copernicus Global Land Service Surface Soil Moisture 1 km (SSM1km)
*data products*

## Specifications
- **level**: L3
- **distributor**: esa
- **gsd m**: {"native":1000}
- **access endpoint**: https://land.copernicus.eu/en/products/soil-moisture
- **access model**: open
- **licence**: Copernicus open access
- **cost model summary**: Free and open via Copernicus Land Monitoring Service; daily Sentinel-1 SAR-derived surface soil moisture
- **primary data portal url**: https://land.copernicus.eu/en/products/soil-moisture
- **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\":1000}","access_endpoint":"https://land.copernicus.eu/en/products/soil-moisture","access_model":"open","licence":"Copernicus open access","cost_model_summary":"Free and open via Copernicus Land Monitoring Service; daily Sentinel-1 SAR-derived surface soil moisture","primary_data_portal_url":"https://land.copernicus.eu/en/products/soil-moisture","deployment_context":"orbital"}

## Editorial
Copernicus Global Land Service Surface Soil Moisture 1 km (SSM1km) is a Level-3 surface soil moisture product derived from Sentinel-1 C-band SAR backscatter. The retrieval applies the TUW (Technische Universitaet Wien) change detection model to C-band backscatter observations.[^cgls-tuw-paper]

Spatial resolution is 1000 m and geographic coverage is the European continent; a global product is not part of the current version. Output is provided as daily composites for dates when Sentinel-1 data are available, dependent on the Sentinel-1 acquisition plan and the satellite repeat cycle, which varies between approximately 6 and 12 days per swath depending on orbit configuration.[^cgls-ssm1km-portal]

The product provides soil moisture as a relative saturation index (degree of saturation). It is suited for agricultural monitoring, drought assessment, and hydrological modelling applications across Europe where daily surface wetness state at regional scale is required.[^cgls-ssm1km-portal]

Access is free and open via the Copernicus Land Monitoring Service at land.copernicus.eu. No registration is required.[^cgls-ssm1km-portal]

## Compositional position
- soil-moisture (topics) --[topic_capabilities]--> Copernicus Global Land Service Surface Soil Moisture 1 km (SSM1km)
- groundwater (topics) --[topic_capabilities]--> Copernicus Global Land Service Surface Soil Moisture 1 km (SSM1km)

## Sources
- [cgls-ssm1km-portal] | CGLS Surface Soil Moisture 1km product, Copernicus Land Service | https://land.copernicus.eu/en/products/soil-moisture | tier=operator-datasheet | accessed=2026-05-31
- [cgls-tuw-paper] | 1km soil moisture from Sentinel-1 and ASCAT within CGLS, ResearchGate | https://www.researchgate.net/publication/325020951_1_KM_SOIL_MOISTURE_FROM_SENTINEL-1_AND_ASCAT_EVOLUTIONS_ACTIVITIES_WITHIN_THE_COPERNICUS_GLOBAL_LAND_SERVICE | tier=peer-reviewed | accessed=2026-05-31

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Source: https://eo-atlas.org/data_products/cgls-ssm1km
Maintainer: SpectraWorks B.V. (CC-BY 4.0)