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Les objectifs :L\u2019objectif du projet était la production d\u2019une base de données diachronique d\u2019occupation du sol en deux dimensions, sur le territoire du Nord et du Pas de Calais, à partir de la photo-interprétation assistée par ordinateur (PIAO) d\u2019orthophotographies des années 2021, 2015 et 2005.Le territoire :L\u2019OCS2D a été réalisé sur les départements du Nord et du Pas-de-Calais. Ce territoire couvre environ 13 800 km², regroupant 17 SCOT, 1 PETR, 2 PNR (cf. figure 1). Un zone tampon de ~1 km a été intégrée à la zone d\u2019étude sur les versants picards et belges.<\/SPAN><\/P>

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