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11 results for “Gironde”
Initial Sample of HYPERNETS Hyperspectral Water Reflectance Measurements for Satellite Validation at the mouth of the Gironde Estuary, MAFR site (France)
<p>The HYPERNETS project (www.hypernets.eu) has the overall aim to ensure that high quality in situ measurements are available to support the (VNIR/SWIR) optical Copernicus products. Therefore, it established a new autonomous hyperspectral spectroradiometer (HYPSTAR® - www.hypstar.eu) dedicated to land and water surface reflectance validation with instrument pointing capabilities. In the prototype phase, the instrument is being deployed at 24 sites covering a range of water and land types and a range of climatic and logistic conditions. This dataset provides the first published data for the HYPERNETS site at the Gironde Estuary, MAGEST Network, in France (MAFR). It is a subset of the complete data record which consists of the best quality MAFR measurements which could be used for satellite validation. </p> <p>The provided NetCDF files are the L2A hypernets products with water leaving radiance and reflectances without NIR Similarity Correction (see Ruddick et al., 2006, DOI:<a href="http://dx.doi.org/10.2307/3841124">10.2307/3841124</a>). The reflectance in the L2A products is the Water Reflectance without NIR Similarity Correction (referred to as reflectance_nosc in the file) defined as:</p> <p><span class="math-tex"><em>ρ</em><em>w</em><em>n</em><em>o</em><em>s</em><em>c</em>=<em>π</em>(<em>L</em><em>u</em>−<em>ρ</em><em>F</em><em>L</em><em>d</em>)/<em>E</em><em>d</em></span></p> <p>where Lu is the upwelling radiance (at 40° zenith angle, and, 90° or 135° azimuth angle relative to the sun), Ld is the downwelling radiance (at 140° zenith angle, and, 90° or 135° azimuth angle relative to the sun). Ed is the (hemispherical) downwelling irradiance (i.e. including both direct solar and diffuse sky irradiance).</p> <p>These reflectances have dimensions of wavelength and series, where each series is a set of measurements for the computation of a water reflectance measurement. In addition to variables for wavelength and bandwidth, the files also contain variables that provide for each series the acquisition time, viewing and solar angles, and quality flags (typically no flags are set in the data provided in this dataset). These NetCDF files also contain further relevant metadata as attributes. See https://hypernets-processor.readthedocs.io/ for further info.</p> <p>The HYPSTAR®-SR (Standard Range) instruments deployed at each land HYPERNETS site consist of a VNIR sensor and autonomously collect data between 380-1000 nm at various viewing geometries and send it to a central server for quality control and processing. The VNIR sensor spans 1330 channels between 380 and 1000 nm with a FWHM of 3 nm. The hypernets_processor (Goyens et al. 2021, DOI: <a href="https://doi.org/10.1109/IGARSS47720.2021.9553738">10.1109/IGARSS47720.2021.9553738</a>; De Vis et al. in prep.) automatically processes all this data into various products, including the L2A surface reflectance product provided here. The current dataset is limited to the 400-900 nm range. Uncertainties are not yet included.</p> <p>To obtain this dataset, we start from the full MAFR data record and omit all the data that do not pass all of the quality checks performed as part of the hypernets_processor. In addition, an additional screening procedure was developed to supply the best quality data suitable for satellite validation:</p> <p>1. The coefficient of variation in water reflectance is below 10% in the 600-700 nm range</p>
"Marsh" database: characterization of the state of the necton in two depolderized zones of the Gironde estuary
<p>In the Gironde estuary, two accidentally de-polderized marshes have been the subject of biological monitoring (necton) since 2008: the Marais de Mortagne-sur-Gironde and the northern part of Île Nouvelle. The Mortagne-sur-Gironde marsh is located in the mesohalin sector of the Gironde estuary. With an area of 191 hectares, the marsh was dammed in 1966 and cultivated for more than 30 years. Its protective dike gave way during the December 1999 storm. Ile Nouvelle is located in the Oligaline Sector of the Gironde Estuary. The northern part of the island - an area of 141 hectares - has been depolderized during the passage of storm Xynthia in 2010, following the opening of a breach.<br> Biological monitoring (necton) was carried out in the Gironde estuary over the period 2008-2016 to test the hypothesis that the depoldisation of the estuarine shorelines makes it possible to recreate nursery and feeding areas for fish and fish. estuarine and coastal macrocrustaceans. This work was carried out by the National Institute for Research in Science and Technology for the Environment and Agriculture (Irstea), in partnership with the Conservatoire du Littoral, the Gironde Departmental Council and the Regional Council for Natural Areas ( CREN) of Poitou-Charentes.<br> The "Marsh" database includes all the surveys carried out throughout the study, between 2008 and 2016, and in particular samplings carried out within the necton.</p>
Figure 3. – A in Macrozoobenthic resources use by teleosts in the Gironde estuary
Figure 3. – A: Dendrogram obtained from cluster analysis of the macrozoobenthic composition in the Gironde estuary (based on numerical percentages (%N) according to Bray-Curtis similarity); the red line indicates the threshold used by SIMPROF to separate the groups. B: Contributions (%)of the discriminating taxa in each macrozoobenthic assemblage of the Gironde estuary identified by SIMPROF determined using similarity percentage analysis (SIMPER). Cut off for low contributions: 90%.
Figure 7 in Macrozoobenthic resources use by teleosts in the Gironde estuary
Figure 7. – Ontogenetic variation of diet of Pomatoschistus minutus, Dicentrarchus punctatus, Pomatoschistus microps, Platichthys flesus and Solea solea based on numerical percentages %N of the prey phylum consumed. Dendrograms on the right were obtained from cluster analysis of the diet composition (%N) of each size class according to Bray-Curtis similarity. The red lines indicate the thresholds used by SIMPROF to separate the size classes with similarities in diet. 'TL' means total length.
Figure 2 in Macrozoobenthic resources use by teleosts in the Gironde estuary
Figure 2. – Total biomass (A) and total density (B) of macrozoobenthos species that occurred at each sampling station in July, going from downstream (left of the plot) to upstream (right of the plot) of the Gironde estuary. The colours of the diamonds at the top of each station value correspond to the macrozoobenthic assemblage they belong (Fig. 3B). See Fig. 1 for location of the stations.
Figure 6 in Macrozoobenthic resources use by teleosts in the Gironde estuary
Figure 6. – Spatial variation of diet (%N of prey phylum in the composition of diet) of Dicentrarchus punctatus, Pomatoschistus minutus, P. microps, Platichthys flesus and Solea solea (left) and that of the potential preys available in the macrozoobenthos (%N of phylum abundance at the respective stations) (right). "n.i" means "not identified". Caution: the abundance of mysids (hyperbenthic taxa) was not assessed in the intertidal area because sampling was performed at low tide.
Figure 5 in Macrozoobenthic resources use by teleosts in the Gironde estuary
Figure 5. – Dendrogram obtained according to Bray-Curtis similarity from cluster analysis of the diet composition (based on numerical percentages %N of the prey taxa consumed) of Pomatoschistus minutus, Dicentrarchus punctatus, Solea solea, Pomatoschistus microps and Platichthys flesus from the Gironde estuary. The red line indicates the threshold used by SIMPROF to separate the teleosts with similarities in diet. Pie charts on the right show the main prey taxa that contributed to the diet of each teleost species (% N). Cut off for low contributions: 90%.
Figure 1 in Macrozoobenthic resources use by teleosts in the Gironde estuary
Figure 1. – Location of the sampling stations of macrozoobenthos and teleosts in the Gironde estuary. Letters indicate the codes of the sampling stations; Intertidal stations: R = Richard, CD = Chant Dorat, M = Mortagne, StC = St Christoly, StE = St Estèphe, IM = Île Nouvelle, L = Lamarque; Subtidal stations: AvS = Aval Saintonge, AvC = Aval Centre, AvM = Aval Médoc, MaS = Maubert Saintonge, MaC = Maubert Centre, MaM = Maubert Médoc, CoS = Conac Saintonge, CoC = Conac Centre, CoM = Conac Médoc, CeS = Centrale Saintonge, CeC = Centrale Centre, CeM = Centrale Médoc, IS = Les Îles Saintonge, IC = Les Îles Centre, IM = Les Îles Médoc, LS = Lamarque Saintonge, LM = Lamarque Médoc. Main towns of the estuary are provided in the map as landmarks and are represented with black dots. 'CNPE' means 'Centre Nucléaire de Production d'Électricité'.
Figure 4 in Macrozoobenthic resources use by teleosts in the Gironde estuary
Figure 4. – Cumulative prey curves for Solea solea (n = 32), Platichthys flesus (n = 26), Dicentrarchus punctatus (n = 69), Pomatoschistus minutus (n = 220) and Pomatoschistus microps (n = 40) (preys identified to the lowest taxonomic level possible).
Moulin à vent de Saint-Aubin-de-Branne (Gironde)
Moulin à vent de Lescours à Saint-Aubin-de-Branne, construit vers 1810. Relevé photogrammétrique effectué par la mission drone de la Drac Nouvelle-Aquitaine dans le cadre d'un exercice d'entraînement (relevé en pilotage manuel d'une structure circulaire). Drone : DJI phantom 3 advanced / traitement : Agisoft Photoscan Source: Objaverse 1.0 / Sketchfab
Exploring Long-term Risks and STI Prevalence in Pre-Exposure Prophylaxis Users in Gironde, France
ClinicalTrials.gov study NCT06600087. IPD Sharing: NO. Countries: 1. Publications: 0.
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