Merlin O. auteur aut IRD Chehbouni Abdelghani auteur aut IRD Kerr Y. auteur aut IRD Njoku E.G. auteur aut IRD Entekhabi D. auteur aut IRD text journalArticle eng text/pdf born digital access A new physically based disaggregation method is developed to improve the spatial resolution of the surface soil moisture extracted from the Soil Moisture and Ocean Salinity (SMOS) data. The approach combines the 40-km resolution SMOS multiangular brightness temperatures and 1-km resolution auxiliary data composed of visible, near-infrared, and thermal infrared remote sensing data and all the surface variables involved in the modeling of land surface-atmosphere interaction available at this scale (soil texture, atmospheric forcing, etc.). The method successively estimates a relative spatial distribution of soil moisture with fine-scale auxiliary data, and normalizes this distribution at SMOS resolution with SMOS data. The main assumption relies on the relationship between the radiometric soil temperature inverted from the thermal infrared and the microwave soil moisture. Based on synthetic data generated with a land surface model, it is shown that the radiometric soil temperature can be used as a tracer of the spatial variability of the 0-5 cm soil moisture. A sensitivity analysis shows that the algorithm remains stable for big uncertainties in auxiliary data and that the uncertainty in SMOS observation seems to be the limiting factor. Finally, a simple application to the SGP97/AVHRR data illustrates the usefulness of the approach specialized SURFACE DU SOL HUMIDITE DU SOL INTERACTION OCEAN ATMOSPHERE SALINITE TELEDETECTION SPATIALE CAPTEUR AVHRR RADIOMETRIE MODELISATION TELEDETECTION MULTISPECTRALE 126TELAPP06 43 9 2036-2050 2005 0196-2892 https://www.documentation.ird.fr/hor/fdi:010046763 10.1109/TGRS.2005.853192 0196-2892 [F B010046763] https://www.documentation.ird.fr/hor/fdi:010046763 https://www.documentation.ird.fr/intranet/publi/2023-02/010046763.pdf Accès réservé (Intranet de l'IRD) IRD - Base Horizon / Pleins textes 2009-06-26 2023-02-28 fdi:010046763 fre