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Ground-penetrating radar measurement of crop and surface water content dynamics / G. Serbin in Remote sensing of environment, vol 96 n° 1 (15/05/2005)  

Public [article]  inRemote sensing of environment > vol 96 n° 1 (15/05/2005) . - pp 119 - 134 Titre : Ground-penetrating radar measurement of crop and surface water content dynamics Type de document : Article/Communication Auteurs : G. Serbin, Auteur ; D. Or, Auteur Année de publication : 2005 Article en page(s) : pp 119 - 134 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Traitement d'image [Termes IGN] diffusion du rayonnement [Termes IGN] humidité du sol [Termes IGN] masse végétale [Termes IGN] propriété diélectrique [Termes IGN] radar pénétrant GPR [Termes IGN] réflectance de surface [Termes IGN] réflectance du sol [Termes IGN] sous-bois [Termes IGN] temps de propagation [Termes IGN] teneur en eau de la végétation Résumé : (Auteur) Ground-penetrating radar (GPR) with a suspended 1 GHz horn antenna was deployed for measurement of soil water contents and crop canopy properties over bare and electrically terminating surfaces. Surface reflection (SR) and signal propagation times (PT) were used to independently determine dielectric permittivity and water content of soil and canopy. Measured surface reflection coefficients progressively decreased with increasing canopy biomass according to Beer-Lambert type relationships. In contrast, PT measurements remained unaffected by canopy, and hence provided an accurate account of soil water content dynamics. Immediately after canopy removal, SR-based soil water content measurements were in close agreement with PT values. Canopy dielectric properties were inferred from canopy water contents (ec-CWC) and canopy propagation times (ec-CPT). Distinct canopy reflections were correlated with key canopy biophysical parameters. The study demonstrates the usefulness of a horn antenna GPR for characterization of vegetation canopy scattering, and for subcanopy water content measurements within a well-defined footprint, thereby offering a potential for calibration and verification of radar data collected from air- and spacebome platforms. Numéro de notice : A2005-212 Affiliation des auteurs : non IGN Thématique : FORET/IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1016/j.rse.2005.01.018 En ligne : https://doi.org/10.1016/j.rse.2005.01.018 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=27349 [article]