New release of L3TB

Category : CATDS, L3

It was noticed by several users that our new RFI filter was overdoing things a bit (actually one of the flags was wrong) leading to a very reduced amount of available brightness temperatures, in our L3TB product (version number 300).

The bug is corrected and the whole data set (L3TB and L3RFI, since 2010) has been reprocessed.

The new products have version number 310.

Changes in SMOS L3 TB

Category : CATDS, L3

Important information…

It was noticed by several users that our new RFI filter was overdoing things a bit (actually one of the flags was wrong) leading to a very reduced amount of available brightness temperatures.

We are working on this issue and already François and Stéphane have patched the bug and tests were carried out at CESBIO before implementation which is underway at CATDS.

The new products will have version number 310

Very soon the operational algorithm will release -less abusely filtered -  L3TB data (with more measurements thus) and we will also reprocess the whole data set (both L3TB and RFI).


Category : CATDS, L3, Ocean

Dear  SMOS users,

All the SMOS L3 soil moisture, ocean salinity and common products, from January 2010 to April 2015, have been reprocessed. You can download those products from

a) CATDS with the usual procedure (if you do not have a password contact contact to get one) or

b) through the SIPAD interface (

Please NOTE :
- All the reprocessed products use the EASE2 grid.
- The CATDS processor’s version used is 300, which correspond to the DPGS version v620
- The reprocessed products are tagged RE04
- These reprocessed products are derived using the same algorithm as the one used in the CATDS real time processing, hence ensuring temporal continuity.
- A new RFI (radio frequency interference) probability product is available.

Very soon we will also make available 6 years of root zone soil moisture from SMOS

We appreciate your feed back so do not hesitate to contact us

Remember the SMOSDATA POLICY : The CATDS data are freely distributed. However, when using these data in a publication, we request that the following acknowledgement be given :
« These data were obtained from the « Centre Aval de Traitement des Données SMOS » (CATDS), operated for the « Centre National d’Etudes Spatiales » (CNES, France) by IFREMER (Brest, France) »

The Sky and Galaxy as seen from SMOS (first cut)

Category : Data

Since its launch, SMOS has been pointed at the deep sky for calibration purposes once a month, acquiring a small patch orf real estate each time. That was almost 6 years ago (time flies!). During this period the satellite has cumulated a large coverage of the sky.

François Cabot at CESBIO used all the T1 B data of such acquisitions, of maneuvres etc, discarded all the views with the sun above the antenna plane and has produced  the sky map as seen by SMOS.

This is a first cut. As the goal was always to point towards the North galactic pole,  the Southern hemispehre is much less covered and thus noisier…SMOSSkyMap

Figure 1 Sky Map as seen by SMOS

The results are very nice aren’t they?

Note the RFI (from China) occuring regularly and acquired through the back lobes as can been seen around the « equator »?

So some clean up is still necessary but we wanted to share with you this outstanding first cut result which compares very favourably with the « official » sky map, though some differences can be seen! and are quite interesting… Spot them!

Note also that the map below is obtained without convoluting with the synthetic antenna pattern.


Figure 2 Reference sky map at L band

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