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Evaluating an improved parameterization of the soil emission in L-MEB / Jean-Pierre Wigneron in IEEE Transactions on geoscience and remote sensing, vol 49 n° 4 (April 2011)  

Public [article]  inIEEE Transactions on geoscience and remote sensing > vol 49 n° 4 (April 2011) . - pp 1177 - 1189 Titre : Evaluating an improved parameterization of the soil emission in L-MEB Type de document : Article/Communication Auteurs : Jean-Pierre Wigneron, Auteur ; A. Chanzy, Auteur ; Yann H. Kerr, Auteur ; et al., Auteur Année de publication : 2011 Article en page(s) : pp 1177 - 1189 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Traitement d'image [Termes IGN] bande L [Termes IGN] biosphère [Termes IGN] emissivité [Termes IGN] étalonnage de modèle [Termes IGN] humidité du sol [Termes IGN] rugosité du sol [Termes IGN] télédétection en hyperfréquence Résumé : (Auteur) In the forward model [L-band microwave emission of the biosphere (L-MEB)] used in the Soil Moisture and Ocean Salinity level-2 retrieval algorithm, modeling of the roughness effects is based on a simple semiempirical approach using three main “roughness” model parameters: HR, QR, and NR. In many studies, the two parameters QR and NR are set to zero. However, recent results in the literature showed that this is too approximate to accurately simulate the microwave emission of the rough soil surfaces at L-band. To investigate this, a reanalysis of the PORTOS-93 data set was carried out in this paper, considering a large range of roughness conditions. First, the results confirmed that QR could be set to zero. Second, a refinement of the L-MEB soil model, considering values of NR for both polarizations (namely, NRV and NRH), improved the model accuracy. Furthermore, simple calibrations relating the retrieved values of the roughness model parameters HR and (NRH - NRV) to the standard deviation of the surface height were developed. This new calibration of L-MEB provided a good accuracy (better than 5 K) over a large range of soil roughness and moisture conditions of the PORTOS-93 data set. Conversely, the calibrations of the roughness effects based on the Choudhury approach, which is still widely used, provided unrealistic values of surface emissivities for medium or large roughness conditions. Numéro de notice : A2011-130 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1109/TGRS.2010.2075935 Date de publication en ligne : 09/11/2010 En ligne : https://doi.org/10.1109/TGRS.2010.2075935 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=30909 [article]

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