Presentation of the CATDS : Description of the SMOS L3 Products Generation and Dissemination
Guibert, Sarah1; Tarot, Stéphane2; Cabot, François3; Hourcastagnou, Jean-Noël1; Larigauderie, Carole1; Kerr, Yann3; Reul, Nicolas2; Boutin, Jacqueline4
1CNES, FRANCE; 2IFREMER, FRANCE; 3CESBIO, FRANCE; 4LOCEAN, FRANCE
The CATDS (Centre Aval de Traitement des Données SMOS) is the french ground-segment facility in charge of the generation, calibration, archiving and dissemination of the SMOS science products level 3 and level 4. It processes Ocean Salinity (OS) and Soil Moisture (SM) products. CATDS is also a centre providing services to users and scientists.
Therefore, it is in charge of:
CATDS is split in two main types of components:
The CATDS processing chain to generate SM and OS L3 data from L1B products is composed of several processors. Some of them (L1C and L2 processors) are based on the ESA DPGS's prototypes. The main difference with level 2 processes is that DPGS processing is based on half an orbit, whereas CATDS processing is based on several days of data. On the SM side per example, the CATDS L2 processor takes into account several revisits simultaneously, and this once per day.
One of the goal of the CATDS L3 processors is to select correct input data and to reject the dubious ones. These L3 processors perform temporal analysis, time aggregations and spatial and temporal averages.
The L3 products generated and distributed by CATDS are the following:
The C-PDC is operational since the middle of year 2011. The first reprocessing campaign was performed at the beginning of 2012, taking into account more than 2 years of measurements (January 2010 to April 2012). In September 2013 C-PDC will distribute almost 4 years of level 3 SM and OS products. A web site (www.catds.fr) describes the products and gives information related to the operational status.
Users can access the products either through FTP or through the Sipad, an interactive Web based tool which allows aggregations and sub-settings.
A single point of contact (firstname.lastname@example.org) operated by the production center allows users:
We present here the CATDS production centre with a focus on processing chains and on the exploitation status. We also describe the L3 data dissemination process and the way to retrieve CATDS L3 products.