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Model investigation about the potential of C-band SAR in herbaceous wetlands flood monitoring / F. Grings in International Journal of Remote Sensing IJRS, vol 29 n° 17-18 (September 2008)  

Public [article]  inInternational Journal of Remote Sensing IJRS > vol 29 n° 17-18 (September 2008) . - pp 5361 - 5372 Titre : Model investigation about the potential of C-band SAR in herbaceous wetlands flood monitoring Type de document : Article/Communication Auteurs : F. Grings, Auteur ; P. Ferrazzoli, Auteur ; et al., Auteur Année de publication : 2008 Article en page(s) : pp 5361 - 5372 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Traitement d'image radar et applications [Termes IGN] bande C [Termes IGN] delta [Termes IGN] image Envisat-ASAR [Termes IGN] image radar [Termes IGN] marais [Termes IGN] Parana (Brésil) [Termes IGN] polarimétrie radar [Termes IGN] surveillance de la végétation Résumé : (Auteur) Wetlands are areas where the presence of water at or near the soil surface drives the natural system. Imaging radars (SARs) have distinct characteristics which make them of significant value for monitoring and mapping wetland inundation dynamics. The presence or absence of water (which has a much higher dielectric constant than dry or wet soil) in wetlands may significantly alter the signal detected from these areas depending on the dominant vegetation type, density, and height. The objective of this paper is to present our current research efforts to explain and correctly simulate the radar response of wetland vegetation/inundation mixtures, and use simulations as an aid for retrieval applications. The radar response of junco marshes under different flood conditions and vegetation stages is analysed using a set of 13 multipolarization ENVISAT ASAR scenes acquired over the Paraná River Delta marshes during the period 2003-2005. The main aspect of the approach followed is the simulation of SAR wave interactions with vegetation and water, using an adapted and improved version of the EM model developed at Tor Vergata University. The results obtained indicate that with the refined EM model, it is possible to represent with a good accuracy VV and HH SAR responses of junco marshes for a variety of environmental conditions. Further work and data are needed to explain measured HV backscattering. The general agreement obtained between simulations and observations permitted the development of a simple retrieval scheme, and estimates of water level below the canopy were obtained for different environmental conditions. RMS errors of forward simulations and retrievals are reported and discussed. Copyright Taylor & Francis Numéro de notice : A2008-532 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1080/01431160802036409 En ligne : https://doi.org/10.1080/01431160802036409 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=29602 [article]

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Code-barres	Cote	Support	Localisation	Section	Disponibilité
080-08111	RAB	Revue	Centre de documentation	En réserve L003	Exclu du prêt