FERNANDEZ-MORAN, Roberto; WIGNERON, Jean-Pierre; DE LANNOY, Gabrielle; LOPEZ-BAEZA, Ernesto; MIALON, Arnaud; MAHMOODI, Ali; PARRENS, Marie; AHMAD, Al Bitar; RICHAUME, Philippe; KERR, Yann H.

doi:10.1109/IGARSS.2016.7729209

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FERNANDEZ-MORAN, Roberto
Interactions Sol Plante Atmosphère [UMR ISPA]
Universitat de València = University of Valencia [UV]

WIGNERON, Jean-Pierre
Interactions Sol Plante Atmosphère [UMR ISPA]

DE LANNOY, Gabrielle
NASA Goddard Space Flight Center [GSFC]

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IEEE International Geoscience and Remote Sensing Symposium Proceedings, IEEE International Geoscience and Remote Sensing Symposium Proceedings, IGARSS 2016 Advancing the understanding of our living planet, 2016-07-10, Pékin. 2016

IEEE

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This study focuses on the calibration of the effective scattering albedo (ω) of vegetation in the soil moisture (SM) retrieval at L-Band. Currently, in the SMOS Level 2 and 3 algorithms, the value of ω is set to 0 for low vegetation and ∼ 0.06 – 0.08 for forests. Different parameterizations of vegetation (in terms of ω values) were tested in this study. The possibility of combining soil roughness and vegetation contributions as a single parameter (“combined” method) leads to an important simplification in the algorithm and was also evaluated here. Following these assumptions, retrieved values of SMOS SM were compared with SM data measured over many in situ sites worldwide from the International Soil Moisture Network. These validation sites were classified using the International Geosphere-Biosphere Programme (IGBP) classification scheme. In situ SM measurements and SM retrievals were compared, and statistical scores were computed. The optimum albedo configuration was then found for each class of the IGBP landcover classification. Preliminary results yield values of albedo between 0.07 to 0.12 under the assumption of homogeneous pixels.< Réduire

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SMOS

soil moisture

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SMAP

scattering albedo

L-MEB model

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Calibrating the effective scattering albedo in the SMOS algorithm: some first results

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