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Auteur Dara Entekhabi |
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Soil and vegetation scattering contributions in L-Band and P-Band polarimetric SAR observations / S. Hamed Alemohammad in IEEE Transactions on geoscience and remote sensing, vol 57 n° 11 (November 2019)
[article]
Titre : Soil and vegetation scattering contributions in L-Band and P-Band polarimetric SAR observations Type de document : Article/Communication Auteurs : S. Hamed Alemohammad, Auteur ; Thomas Jagdhuber, Auteur ; Mahta Moghaddam, Auteur ; Dara Entekhabi, Auteur Année de publication : 2019 Article en page(s) : pp 8417 - 8429 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Traitement d'image radar et applications
[Termes IGN] bande L
[Termes IGN] bande P
[Termes IGN] canopée
[Termes IGN] constante diélectrique
[Termes IGN] couvert végétal
[Termes IGN] données polarimétriques
[Termes IGN] humidité du sol
[Termes IGN] image captée par drone
[Termes IGN] image radar moirée
[Termes IGN] micro-onde
[Termes IGN] rugosité du sol
[Termes IGN] teneur en eau de la végétationRésumé : (auteur) Active microwave-based retrieval of soil moisture in vegetated areas has uncertainties due to the sensitivity of the signal to both soil (dielectric constant and roughness) and vegetation (dielectric constant and structure) properties. A multi-frequency acquisition system would increase the number of observations that may constrain soil and/or vegetation parameter retrievals. In order to realize this constraint, an understanding of microwaves interaction with the surface and vegetation across frequencies is necessary. Different microwave frequencies have varied interactions with the soil-vegetation medium and increasing penetration into the soil and canopy with the decreasing frequency. In this study, we examine the contributions of different scattering mechanisms to coincident observations from two microwave frequencies (L and P) of airborne synthetic aperture radar instruments. We quantify contributions of surface, vegetation volume, and double-bounce scattering components. Results are analyzed and discussed to guide future multi-frequency retrieval algorithm designs. Numéro de notice : A2019-594 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1109/TGRS.2019.2920995 Date de publication en ligne : 27/06/2019 En ligne : https://doi.org/10.1109/TGRS.2019.2920995 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=94586
in IEEE Transactions on geoscience and remote sensing > vol 57 n° 11 (November 2019) . - pp 8417 - 8429[article]Embedding landscape processes into triangulated terrain models / E.R. Vivoni in International journal of geographical information science IJGIS, vol 19 n° 4 (april 2005)
[article]
Titre : Embedding landscape processes into triangulated terrain models Type de document : Article/Communication Auteurs : E.R. Vivoni, Auteur ; V. Teles, Auteur ; V.Y. Ivanov, Auteur ; R.L. Bras, Auteur ; Dara Entekhabi, Auteur Année de publication : 2005 Article en page(s) : pp 429 - 457 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications SIG
[Termes IGN] bassin hydrographique
[Termes IGN] discrétisation spatiale
[Termes IGN] érosion hydrique
[Termes IGN] géomorphologie
[Termes IGN] modèle de simulation
[Termes IGN] pente
[Termes IGN] prédiction
[Termes IGN] ruissellement
[Termes IGN] simulation
[Termes IGN] système d'information géographique
[Termes IGN] topographie
[Termes IGN] Triangulated Irregular Network
[Termes IGN] triangulation localeRésumé : (Auteur) Triangulated irregular networks (TIN) can form the basis for multiple-resolution representations in distributed hydrogeomorphic simulations over complex basins. Current methods for deriving TIN meshes depend primarily on surface slope without considering other terrain attributes significant to the watershed response such as the specific basin area. As an alternative, we present a methodology for combining a hydrogeomorphic or landscape index with an unstructured triangulated mesh. Landscape indices provide a concise method for describing steady-state terrain processes by isolating the dominant physical factors. The mesh-generation algorithm results in an adaptive discretization that resembles the spatial pattern of the landscape index with a high resolution retained in areas expected to impact the basin response. We compare the proposed algorithm with a slope-preserving method as a means for initializing the terrain representation in two TIN-based hydrogeomorphic models. Through three case studies in saturation-excess runoff, transport-limited soil erosion and shallow landslide simulation, we assess the distributed model sensitivity to the triangulated terrain algorithm. Model comparisons reveal that the process-based triangulations focus the distributed simulation in regions anticipated via a steady-state index to affect the transient watershed response. Numéro de notice : A2005-098 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article DOI : 10.1080/13658810512331325111 En ligne : https://doi.org/10.1080/13658810512331325111 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=27236
in International journal of geographical information science IJGIS > vol 19 n° 4 (april 2005) . - pp 429 - 457[article]Réservation
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