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Référence : Méthode de cartographie du trait de côte de l'OCNA décrite dans le rapport BRGM/RP-71582-FR.
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1)Acquisition : Trait de côte digitalisé sur l'orthophotographie de 2018 et des données lidar (MNT, dérivés) ((c) IGN, OCNA), aidé localement par la connaissance terrain, les acquisitions topographiques au DGPS menées par l'OCNA, les photographies aériennes et in-situ. Les ouvrages longitudinaux de protection côtiers ont été considérés dans cette cartographie lorsqu'ils se substituaient au trait de côte (cf. descripteurs)
2)Traitement : Identification des descripteurs du trait de côte à partir des données cartographiques par visualisation et de la connaissance du terrain. Echelle de digitalisation 1/1500. 
3)Contenu :
ANNEE : Année du trait de côte (relatif au support de digitalisation)
SHAPE_LENG : Longueur en kilomètres du tronçon
DESCR_TDC : Descripteur du trait de côte. SDF : sommet de falaise ; PDC : pied de cordon ; PDD : pied de dune; PDO : pied d'ouvrage ; SDO : sommet d'ouvrage, LSS : limite supérieure du schorre; LDV : limite de végétation (falaises estuarienne Gironde uniquement)
ENVIRONMT : Environnement littoral dans le quel évolue le trait de côte : dune littorale, falaise rocheuse, cordon de galets, cordon sableux, polder, port, marais maritime, flèche sableuse, grande flèche sableuse, plage de poche.
E_OCNA : secteurs géographiques de la côte de Nouvelle-Aquitaine : E4 : Charente-Maritime; E1 : côte sableuse océanique ouverte de Gironde et des Landes; E3 : Bassin d'Arcachon; E2 : côte basque 
4)Système de référence : Lambert93
5)Référence : se référer à la méthode de cartographie du trait de côte de l'OCNA décrite dans le rapport BRGM/RP-71582-FR.</gco:CharacterString>
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