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22 October 2010SMOS CATDS level 3 global products over land
The Soil Moisture and Ocean Salinity (SMOS) satellite is a 2D interferometer in L-band (1.4 GHz). Over land, it enables
to probe the earth surface emissivity related to soil moisture in the first centimeters of the soil, with an aimed accuracy
better than 4m3.m-3 and an average spatial resolution of 40km. The European Space Agency's (ESA) ground segment
provides half-orbit soil moisture products at level 2. The Centre National d'Etudes Spatiales (CNES) in France has
developed the CATDS (Centre Aval de Traitement des Données SMOS) ground segment in order to produce global
maps, known as level 3 and 4 products. Over land, the algorithm is based on the level 2 soil moisture ESA's prototype.
The major enhancement of the CATDS concerns the use of multi-orbit retrieval. The level 3 Soil moisture (SM) products
are global maps of soil moisture, and other geophysical products (vegetation optical thickness, albedo, soil dielectric
constant or surface temperature). For a particular point, the revisit time is between 1 and 3 days, and the entire Earth's
surface is covered by SMOS field of view in 3 days. Level 3 SM products are available over different time periods. First,
a 1 day global product is generated for each day. Then, 1 day global maps are aggregated in 3-day global products, 10-
day and monthly products.
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Elsa Jacquette, Ahmad Al Bitar, Arnaud Mialon, Yann Kerr, Arnaud Quesney, François Cabot, Philippe Richaume, "SMOS CATDS level 3 global products over land," Proc. SPIE 7824, Remote Sensing for Agriculture, Ecosystems, and Hydrology XII, 78240K (22 October 2010); https://doi.org/10.1117/12.865093