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                  <gco:CharacterString>Lebna :  Emprises des images satellites à THRS (0.5 à 5m) - Bassin versant</gco:CharacterString>
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            <gco:CharacterString>la couche "emprises des images satellites" est une fusion des emprises de chaque image satellite de qualité métrique disponible sur le Lebna (Geoeye-Rapideye-Worldview-Ikonos-Quickbird)
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                  <gco:CharacterString>Le travail est fait à l'issu du recensement des données et images satellites multispectrales disponibles sur le site tunisien du LISAH.
L'assemblage des polygones d'emprises est fait sur QGIS à partir des polygones fournis avec les images brutes.
Un décalage existe entre les rasters des images satellites et les couches vecteurs d'emprise, ce décalage peut être du aux traitements effectués par le fournisseur au moment de l’acquisition.
Les attributs des polygones sont issus d'une mise à jour de la base de données de Cécile Gomez. Les champs renseignés  correspondent aux métadonnées des images satellites telle que fournis par le producteur.
Un champ supplémentaire de traitement des données est créé pour unifier</gco:CharacterString>
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                        <gco:CharacterString>Le bassin versant du Lebna couvre une superficie de 200 km2. Une série temporelle (2003-2012) des images satellites multi-capteurs est visible sur le Quicklook.
La vignette synthétise l'emprise zonale des images sur le bassin versant du Lebna ou Kamech.
Les images satellites disponibles sont de qualité métrique (inférieur à 5 m).
Les séries d'images sont issus de différentes sources Digital Globe, Telespazio et Rapideye.
Les images satellites couvrent les deux sites Lebna et kamech. Sur le bassin versant du Lebna, les images disponibles sont  Geoeye (multispectrale/panchromatique 2.5m/0.5m), Rapideye (multispectrales, 5m), Quickbird (multipsectrale fusionnée, 0.6m). Les images qui couvrent le bassin de Kamech sont Ikonos et worldview (panchromatique, 1m).</gco:CharacterString>
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