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Wetland monitoring with Global Navigation Satellite System reflectometry / Son V. Nghiem in Earth and space science, vol 4 n° 1 (January 2017)  

Public [article]  inEarth and space science > vol 4 n° 1 (January 2017) . - pp 16 - 39 Titre : Wetland monitoring with Global Navigation Satellite System reflectometry Type de document : Article/Communication Auteurs : Son V. Nghiem, Auteur ; Cinzia Zuffada, Auteur ; Rashmi Shah, Auteur ; et al., Auteur Année de publication : 2017 Article en page(s) : pp 16 - 39 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications de géodésie spatiale [Termes IGN] delta [Termes IGN] Ebre (bassin) [Termes IGN] Espagne [Termes IGN] méthane [Termes IGN] réflectométrie par GNSS [Termes IGN] zone humide Résumé : (auteur) Information about wetland dynamics remains a major missing gap in characterizing, understanding, and projecting changes in atmospheric methane and terrestrial water storage. A review of current satellite methods to delineate and monitor wetland change shows some recent advances, but much improved sensing technologies are still needed for wetland mapping, not only to provide more accurate global inventories but also to examine changes spanning multiple decades. Global Navigation Satellite Systems Reflectometry (GNSS-R) signatures from aircraft over the Ebro River Delta in Spain and satellite measurements over the Mississippi River and adjacent watersheds demonstrate that inundated wetlands can be identified under different vegetation conditions including a dense rice canopy and a thick forest with tall trees, where optical sensors and monostatic radars provide limited capabilities. Advantages as well as constraints of GNSS-R are presented, and the synergy with various satellite observations are considered to achieve a breakthrough capability for multidecadal wetland dynamics monitoring with frequent global coverage at multiple spatial and temporal scales. Numéro de notice : A2017-278 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article DOI : 10.1002/2016EA000194 En ligne : https://doi.org/10.1002/2016EA000194 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=85302 [article]

Observations of urban and suburban environments with global satellite scatterometer data / Son V. Nghiem in ISPRS Journal of photogrammetry and remote sensing, vol 64 n° 4 (July - August 2009)  

Public [article]  inISPRS Journal of photogrammetry and remote sensing > vol 64 n° 4 (July - August 2009) . - pp 367 - 380 Titre : Observations of urban and suburban environments with global satellite scatterometer data Type de document : Article/Communication Auteurs : Son V. Nghiem, Auteur ; D. Balk, Auteur Année de publication : 2009 Article en page(s) : pp 367 - 380 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Traitement d'image optique [Termes IGN] banlieue [Termes IGN] Bogota (Colombie) [Termes IGN] Canton (Kouangtoung) [Termes IGN] Dallas (Texas) [Termes IGN] densité de population [Termes IGN] densité du bâti [Termes IGN] détection de contours [Termes IGN] Dhaka (Bangladesh) [Termes IGN] diffusomètre [Termes IGN] échantillonnage d'image [Termes IGN] éclairage public [Termes IGN] image Landsat-ETM+ [Termes IGN] milieu urbain [Termes IGN] Phoenix [Termes IGN] Quito (Equateur) [Termes IGN] télédétection en hyperfréquence Résumé : (Auteur) A global and consistent characterization of land use and land change in urban and suburban environments is crucial for many fundamental social and natural science studies and applications. Presented here is a dense sampling method (DSM) that uses satellite scatterometer data to delineate urban and intraurban areas at a posting scale of about 1 km. DSM results are analyzed together with information on population and housing censuses, with Landsat Enhanced Thematic Mapper Plus (ETM+) imagery, and with Defense Meteorological Satellite Program (DMSP) night-light data. The analyses include Dallas-Fort Worth and Phoenix in the United States, Bogotá in Colombia, Dhaka in Bangladesh, Guangzhou in China, and Quito in Ecuador. Results show that scatterometer signatures correspond to buildings and infrastructures in urban and suburban environments. City extents detected by scatterometer data are significantly smaller than city light extents, but not all urban areas are detectable by the current SeaWinds scatterometer on the QuikSCAT satellite. Core commercial and industrial areas with high buildings and large factories are identified as high-backscatter centers. Data from DSM backscatter and DMSP nighttime lights have a good correlation with population density. However, the correlation relations from the two satellite datasets are different for different cities indicating that they contain complementary information. Together with night-light and census data, DSM and satellite scatterometer data provide new observations to study global urban and suburban environments and their changes. Furthermore, the capability of DSM to identify hydrological channels on the Greenland ice sheet and ecological biomes in central Africa demonstrates that DSM can be used to observe persistent structures in natural environments at a km scale, providing contemporaneous data to study human impacts beyond urban and suburban areas. Copyright ISPRS Numéro de notice : A2009-295 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1016/j.isprsjprs.2009.01.004 En ligne : https://doi.org/10.1016/j.isprsjprs.2009.01.004 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=29925 [article]

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