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	Provedor de dados ArchiMer (1) REA (1) Autor Chapron, Bertrand (1) Gomes,Amanda P. A. (1) Li, Huimin (1) Mouche, Alexis (1) Pinto,Francisco de A. de C. (1) Queiroz,Daniel M. de (1) Rosas,Jorge T. F. (1) Stopa, Justin E. (1) Valente,Domingos S. M. (1) Mais... Palavra-chave Radiometric calibration (2) CMOD5.N (1) Modified RGB camera (1) Precision agriculture (1) Sentinel-1A (S-1A) (1) UAV (1) Wave mode (WV) (1) Mais... Tipo do documento Info:eu-repo/semantics/article (1) Text (1) Ano 2021 (1) 2019 (1) País Brazil (1) France (1) Idioma Inglês (2)		Ordenar por:  Relevância Autor Título Ano Registros recuperados: 2 Primeira ... 1 ... Última COMPARING A SINGLE-SENSOR CAMERA WITH A MULTISENSOR CAMERA FOR MONITORING COFFEE CROP USING UNMANNED AERIAL VEHICLES REA Gomes,Amanda P. A.; Queiroz,Daniel M. de; Valente,Domingos S. M.; Pinto,Francisco de A. de C.; Rosas,Jorge T. F.. ABSTRACT There exist two options for digital cameras that can capture the near-infrared (NIR) band. Conventional red–green–blue (RGB, visible bands) cameras with a single sensor provide NIR band visibility based on the removal of the internal NIR-blocking filter. Alternatively, multisensor cameras exist that have a specific sensor for each band. The modified RGB cameras are of a lower price. In this context, the objective of this study was to compare the performance of a modified RGB camera with that of a multisensor camera for obtaining the normalized difference vegetation index (NDVI) in an area with coffee cultivations. A multispectral camera with five sensors and another camera with only one sensor were used. The NDVI of the coffee field was also... Tipo: Info:eu-repo/semantics/article Palavras-chave: Precision agriculture; UAV; Radiometric calibration; Modified RGB camera. Ano: 2021 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162021000100087 Calibration of the Normalized Radar Cross Section for Sentinel-1 Wave Mode ArchiMer Li, Huimin; Mouche, Alexis; Stopa, Justin E.; Chapron, Bertrand. Sentinel-1 (S-1) is a two-satellite constellation for continuity of operational synthetic aperture radar (SAR) observations. Wave mode (WV) is the default mode over open ocean for S-1 to monitor global ocean waves and wind field. Therefore, proper radiometric calibration is essential to accurately infer these geophysical quantities. Based on the global data set acquired by S-1A WV, assessment of normalized radar cross section (NRCS) is carried out through comparison with CMOD5.N predictions over open ocean. The calibration accuracy quantified by NRCS residuals between SAR measurements and CMOD5.N demonstrates distinct features for two incidence angles (23.8° and 36.8°). Particularly, NRCS at 23.8° is overall consistent with CMOD5.N, while NRCS at 36.8°... Tipo: Text Palavras-chave: CMOD5.N; Radiometric calibration; Sentinel-1A (S-1A); Wave mode (WV). Ano: 2019 URL: https://archimer.ifremer.fr/doc/00457/56882/59006.pdf Registros recuperados: 2 Primeira ... 1 ... Última

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