The European Space Agency Soil Moisture and\udOcean Salinity (SMOS) mission aims at obtaining global maps of\udsoil moisture and sea surface salinity from space for large-scale and\udclimatic studies. It uses an L-band (1400–1427 MHz) Microwave\udInterferometric Radiometer by Aperture Synthesis to measure\udbrightness temperature of the earth’s surface at horizontal and\udvertical polarizations ( h and v). These two parameters will be\udused together to retrieve the geophysical parameters. The retrieval\udof salinity is a complex process that requires the knowledge of\udother environmental information and an accurate processing of\udthe radiometer measurements. Here, we present recent results\udobtained from several studies and field experiments that were part\udof the SMOS mission, and highlight the issues still to be solved.
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