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        <gco:CharacterString>Modèle numérique de terrain (MNT) produit à partir de photographies aériennes stéréoscopiques à 20 cm de résolution spatiale de l'orthophotographie PPIGE 2012-2013. Il se présente sous forme d'un semis de points aux pas de 10 et 20 mètres couvrant l'ensemble de la Région Nord - Pas de Calais.
Quatre produits dérivés en ont été extraits : les courbes de niveau, le Triangular Irregular Network, le MNT Raster et l'ombrage.</gco:CharacterString>
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            <gco:CharacterString>Le MNT GRID a été produit par auto-corrélation à partir de photographies aériennes stéréoscopiques à 20 cm de résolution spatiale acquises en 2012 et 2013 par la PPIGE. Le processus automatique d'auto-corrélation est suivi d’un travail d’édition manuelle consistant à ajouter des lignes de brisure ou à corriger des éléments surfaciques. Ces deux étapes se sont déroulées en 2012 et 2013.
Le MNT est livré sous forme de grilles au pas de 10m et de 20m. La précision en z sur les points mesurés par auto-corrélation est de l'ordre de 25 cm (50 cm sur les surfaces non dures). Cette précision permet de produire des orthophotos de classe de précision totale planimétrique de 50cm évaluée selon le modèle standard.

Ce MNT a été utilisé pour produire un TIN (Triangular Irregular Network) et des courbes de niveau :

Les courbes de niveau ont été produites avec le logiciel GlobalMapper par la société BLOM pour le compte de la PPIGE. L'équidistance des courbes de niveau est de 2,5 mètres et l'altitude de référence est celle du réseau NGF-IGN69.

Le Tin a été crée avec le logiciel Arc Gis par la société BLOM.
Ses attributs sont les suivants : 
slop pct : gradient de la pente en %
Aspect : direction de la pente
tri index : indexation du triangle du TIN

Le MNT Raster a été produit par le Conseil départemental du Pas-de-Calais à partir du logiciel SAGA-GIS 2.2, suivant l'algorithme B-Spline Multiniveaux pour l'interpolation de O.Conrad (2006).</gco:CharacterString>
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