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            <gco:CharacterString>La PPIGE, Plateforme Publique de l'Information Géographique en Nord - Pas de Calais, souhaite doter l'ensemble de la Région Nord-Pas de Calais d'une image aérienne continue exploitable via des progiciels bureautiques, utile dans des domaines variés (l'aménagement du territoire, l'urbanisme, l'environnement, la communication) et pour de nombreuses applications (repérage de la signalisation horizontale dans le domaine des routes, délimitation des espaces naturels sensibles dans le domaine de la protection de l'environnement, mesure planimétrique). La PPIGE a acquis les droits d'utilisation de l'orthophotographie couleur 20 cm - Nord Pas de Calais - 2009 (REGIONAL_RGB_20cm) pour ses ayants droit pour une durée de 10 ans.

**Acquisition et Méthode**

Paramètres de la prise de vue : codage des pixels sur 4 canaux (canal bleu : 0,4 à 0,6 µm, canal vert : 0,48 à 0,66 µm, canal rouge : 0,58 à 0,72 µm, canal proche infrarouge : 0,62-1µm),

Résolution native du pixel de 20 cm,

Recouvrement des prises de vue longitudinal de 65 % et latéral de 25 % minimum pour un dévers maximun de 30 % en zones urbaines.

Calage par aérotriangulation réalisé par blocs selon la méthode de compensation par faisceaux.

Orthorectification réalisée à l'aide d'un MNT d'archive issus à 90 % du MNT PPIGE 2005, à 10 % de MNT produits pour les Communauté d'Agglomération du Calaisis, du Boulonnais, de Lens-Liévin, des Communautés Urbaines de Lille, d'Arras, de la Communauté de Communes de Noeux-les-Mines. Précision altimétrique comprise entre 40 et 70 cm selon les zones. 

**Eléments de Qualité**

Exactitude planimétrique, ou l'écart quadratique moyen de l'orthophotographie 2009 (EMQxy) : 3 pixels (soit 60 centimètres).

Le devers des bâtiments et superstructures n'étant pas corrigé, certains bâtiments ou superstructures peuvent être déformés.</gco:CharacterString>
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