A combined optical-microwave method to retrieve soil moisture over vegetated areas

Abstract : 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.
Type de document :
Article dans une revue
IEEE Transactions on Geoscience and Remote Sensing, Institute of Electrical and Electronics Engineers, 2012, 50 (5), pp.1404-1413. 〈10.1109/TGRS.2011.2179051〉
Liste complète des métadonnées

Littérature citée [36 références]  Voir  Masquer  Télécharger

http://hal.ird.fr/ird-00700888
Contributeur : Dominique Bruel <>
Soumis le : jeudi 24 mai 2012 - 11:21:11
Dernière modification le : jeudi 11 janvier 2018 - 06:19:46
Document(s) archivé(s) le : samedi 25 août 2012 - 02:26:15

Fichiers

mattar.pdf
Fichiers éditeurs autorisés sur une archive ouverte

Identifiants

Collections

Citation

C. Mattar, J.-P. Wigneron, J.A. Sobrino, N. Novello, J.-C. Calvet, et al.. A combined optical-microwave method to retrieve soil moisture over vegetated areas. IEEE Transactions on Geoscience and Remote Sensing, Institute of Electrical and Electronics Engineers, 2012, 50 (5), pp.1404-1413. 〈10.1109/TGRS.2011.2179051〉. 〈ird-00700888〉

Partager

Métriques

Consultations de la notice

475

Téléchargements de fichiers

557