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Estimations satellitales de la couleur de l'eau lagonaire à l'aide des produits Sentinel-2 ArchiMer
Rintz, Cam Ly.
The lagoon of New Caledonia is subject to various pressures, including terrigenous stream inputs. Their evolution – extent, intensity – can be studied through parameters such as ocean color, depending on turbidity or phytoplankton concentration. Satellite imagery is more and more used for this purpose. As the Sentinel-2 (S2) mission, with its satellites providing ten meters-resolution images, has been recently launched, we worked on the characterisation of lagoon color using these products. After testing the performance of existing algorithms for New Caledonia, initially applied to satellites other than S2, we tried to establish a new turbidity algorithm based on field data (measures in the South-West lagoon of New Caledonia and the lagoon near Koumac in...
Tipo: Text Palavras-chave: Couleur de l’eau; Turbidité; Satellite; Télédétection; Réflectance; Lagon; Nouvelle-Calédonie; Sentinel-2.
Ano: 2020 URL: https://archimer.ifremer.fr/doc/00645/75752/76712.pdf
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Surface suspended matter off the Rhone river mouth from visible satellite imagery ArchiMer
Forget, P; Ouillon, S.
The quantification of surface Total Suspended Matter (TSM) off the Rhone river mouth is investigated using SPOT-XS and Landsat-TM images collected in November 1994. The method of satellite data calibration from in situ measurements is discussed. It is based on TSM concentration measurements through filtration of surface water samples and on radiometric data collected with a 256-channel spectroradiometer in the range 400-1100 nm. Empirical relationships between reflectance and TSM concentration are established by linear regression analysis of the data. These relationships are then applied to the image data corrected from atmospheric and surface effects. A good agreement, within a factor of less than two, was found on derived TSM concentration values as...
Tipo: Text Palavras-chave: Réflectance; Matière en suspension; Télédétection; Panache fluvial; Rhône; Reflectance; Suspended matter; Remote sensing; River plume; Rhone river.
Ano: 1998 URL: http://archimer.ifremer.fr/doc/00325/43637/43228.pdf
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