Data access

ftp.ifremer.fr

Presentation

The SMOS INRA-CESBIO (SMOS-IC) algorithm was designed by INRA (Institut National de la Recherche Agronomique) and CESBIO (Centre d’Etudes Spatiales de la BIOsphère) to perform global retrievals of SM and L-VOD. SMOS-IC is based on the two-parameter inversion of the L-MEB model as defined in Wigneron et al. (2017) and considering the pixel as homogeneous.

So, SMOS-IC was designed on the same basis as the level 2 SM algorithm but using some simplifications. Specifically, SMOS-IC does not account for corrections associated with the treatment of retrievals over regions with a heterogeneous land cover (forested areas), the antenna pattern and the complex SMOS viewing angle geometry.

One of the main goals of the SMOS-IC product was thus to be as independent as possible from auxiliary data so as to be more robust and less impacted by potential uncertainties in the afore-mentioned corrections.

The SMOS-IC algorithm and dataset is described in Fernandez-Moran et al. (2017). The current version is 105 and it is provided in the 25km EASEv2 grid, as netcdf format.

SMOS IC is scientific product delivered by the CATDS, i.e. meaning it is not an operational product updated on a daily basis for the time being.

Satellite

Name : SMOS

Imaging mode : interferometry

Spectral bands : L (1413 MHz)

Resolutions : 27-55 km

Observation capability : double global coverage every 3 days

Level

Level 2: single orbit and date product in swath form. Soil moisture, vevetation opacity and dielectric constant. 

Level 3: product obtained by merging several level 2 products over any given period so has to have one global product for a given period of time.

Level 4: elaborated product obtained by combining SMOS data with model outputs (hydrology, statistical, using assimilation) or data from other sensors (disaggregation, data fusion , synergisms).