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                  <gco:CharacterString>1) Acquisition : les orthophotos à partir desquelles le trait de côte a été numérisé ont été acquises par l'IGN entre le 04 et le 07 octobre 2017. La résolution des images est de 10 cm.   2) Traitement : le trait de côte a été numérisé sous ArcGIS à partir des orthophotos. En appui, des courbures longitudinales et des profils topographiques (générés à partir du MNT 2017) ont été utilisés notamment pour les zones fortement végétalisées. Rappel : sur la côte rocheuse, le trait de côte équivaut à la séparation entre la falaise et l'estran (sommet de falaise rocheuse (équivaut au sommet du versant présentant des signes d'instabilité), pied des ouvrages de protection longitudinaux, fond de baie). Ici, les ouvrages de protection longitudinaux ont été maintenus et la position du trait de côte tient donc compte de leurs effets. La numérisation du trait de côte a été réalisée au 1/500e.     3) Contenu : Année (année du TDC); Date_Reali (date de création de la donnée); Source (données ayant servies à obtenir la position du TDC); Description (description de la donnée); Polygone_correction_2017 (historique des évolutions entre le tracé 2016 et 2017)    4) Remarques : Système de coordonnées RGF93/Lambert 93. Mise à disposition des données sur demande directement auprès du producteur de données.</gco:CharacterString>
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