The soil moisture SEC proposes a soil moisture estimation product with indicators (dryness, flooding and rain estimator) for the whole world, twice every 3 days. 

Using the angular values for brightness temperature at 1.4 GHz, a ground humidity estimation is made using SMOS data (and eventually also SMAP data). The product comes with quality indicators (DQX, GQX and Chi2) and only estimates when the ground is not frozen or covered in snow. An RFI (Radio Frequency Identification) flag is also available. 

The soil moisture in the root zone is obtained from this measurement via assimilation in a 3-layer model. A dryness indicator is derived from it as well as a flooding risk detector. A rain estimator is also being validated. A broken down product (100 m 1 Km) is also being used. A real-time product and a retrospective over the past 15 years is being finalised.

The soil moisture product has been operational since 2010 and is available at CATDS (SMOS upstream data treatment centre). The humidity products in the root zone and the dryness indicator are also available at CATDS. A real-time product has been available on the GTS and Eumetcast since 2015. 


Yann Kerr CESBIO

Yann Kerr


Blog Smos (Soil Moisture and Ocean Salinity)

Centre Aval de Traitement des Données SMOS (CATDS)