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A combined optical-microwave method to retrieve soil moisture over vegetated areas
Mattar C., Wigneron J.-P., Sobrino J.A., Novello N., Calvet J.-C., Albergel C., Richaume P., Mialon A., Guyon D., Jimenez-Munoz J.C. et al
IEEE Transactions on Geoscience and Remote Sensing 50, 5 (2012) 1404-1413 - http://hal.ird.fr/ird-00700888
Articles dans des revues avec comité de lecture
Sciences du Vivant/Ecologie, Environnement/Ecosystèmes
A combined optical-microwave method to retrieve soil moisture over vegetated areas
C. Mattar ( ) 1, J.-P. Wigneron () 2, J.A. Sobrino () 1, N. Novello 2, J.-C. Calvet () 3, C. Albergel 4, P. Richaume 5, A. Mialon 5, D. Guyon 2, J.C. Jimenez-Munoz 1, Y.H. Kerr () 5
1 :  Department of Thermodynamics, Faculty of Physics
Universidad de Valencia
Faculty of Physics, University of Valencia, 46100 Burjassot, Spain.
Espagne
2 :  Écologie fonctionnelle et physique de l'environnement (EPHYSE - UR1263)
Institut national de la recherche agronomique (INRA) : UR1263
Service Forêt-Bois, Unité EPHYSE 33612 Cestas Cedex
France
3 :  Groupe d'étude de l'atmosphère météorologique (CNRM-GAME)
http://www.cnrm.meteo.fr
CNRS : URA1357 – INSU – Météo France
METEO FRANCE CNRM 42 Av Gaspard Coriolis 31057 TOULOUSE CEDEX 1
France
4 :  European Centre for Medium Range Weather Forecast (ECMWF)
http://www.ecmwf.int
ECMWF
Shinfield Park RG1 9AX Reading
Royaume-Uni
5 :  Centre d'études spatiales de la biosphère (CESBIO)
http://www.cesbio.ups-tlse.fr
CNRS : UMR5126 – Institut de recherche pour le développement [IRD] – CNES – Observatoire Midi-Pyrénées – INSU – Université Paul Sabatier [UPS] - Toulouse III
bpi 2801 18 Av Edouard Belin 31401 TOULOUSE CEDEX 4
France
A simple approach for correcting for the effect of vegetation in the estimation of the surface soil moisture (wS) from L-band passive microwave observations is presented in this study. The approach is based on semi-empirical relationships between soil moisture and the polarized reflectivity including the effect of the vegetation optical depth which is parameterized as a function of the normalized vegetation difference index (NDVI). The method was tested against in situ measurements collected over a grass site from 2004 to 2007 (SMOSREX experiment). Two polarizations (horizontal/vertical) and five incidence angles (20◦, 30◦, 40◦, 50◦, and 60◦) were considered in the analysis. The best wS estimations were obtained when using both polarizations at an angle of 40◦. The average accuracy in the soil moisture retrievals was found to be approximately 0.06 m3/m3, improving the estimations by 0.02 m3/m3 with respect to the case in which the vegetation effect is not considered. The results indicate that information on vegetation (through a vegetation index such as NDVI) is useful for the estimation of soil moisture through the semi-empirical regressions.
Anglais

IEEE Transactions on Geoscience and Remote Sensing
Publisher Institute of Electrical and Electronics Engineers (IEEE)
ISSN 0196-2892 
non spécifiée
2012
50
5
1404-1413

L-band – microwave radiometry – normalized vegetation difference index (NDVI) – soil moisture (SM) – surface temperature.
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