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                  <gco:CharacterString>Modèle Numérique de Terrain MNT LIDAR 2011 sur le littoral aquitain</gco:CharacterString>
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            <gco:CharacterString>Un Modèle Numérique de Terrain au pas de 1 m a été élaboré par l'IGN à partir d'un levé LIDAR réalisé au printemps 2011, dans le cadre d'un partenariat entre le BRGM et l'IGN pour l'Observatoire de la Côte Aquitaine ; la finalité étant de suivre l'évolution du littoral aquitain. Le MNT est découpé en 649 dalles carrées de 1 km de côté. L'emprise correspond globalement à une bande minimale de 2 km de part et d'autre du trait de côte établi par l'Observatoire de la Côte Aquitaine.</gco:CharacterString>
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                        <gco:CharacterString>Les données LiDAR et orthophotographies associées sont téléchargeables via la plateforme OpenData de PIGMA</gco:CharacterString>
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                  <gco:CharacterString>Le MNT a été généré au pas de 1 m à partir des nuages de points LIDAR classifiés (classe sol). Les vols ont eu lieu du 5 mars au 21 mai 2011. Le capteur utilisé est le ALTM3100EA de l'IGN. Le levé a été conduit à marée basse en période de gros coefficients de marée. Le système d'altitude du MNT est le système IGN69.

La densité d'acquisition est de 2 points par mètre carré. Les nuages de points laser ont été mis en géométrie puis traités automatiquement avec la suite Terrasolid afin d'obtenir un semis de points de sol dont est déduit par  interpolation (triangulation) le MNT. Ces nuages de points ont une précision de 15 cm en altimétrie et 30 cm en planimétrie ; les coordonnées planimétriques sont exprimées en Lambert93 et l'altitude est exprimée dans le système IGN69.

Une révision du nuages de points et du MNT a été menée et transmise en 2015 avec la livraison du millésime 2014 ; les mêmes méthodes de post-traitements ont été appliquées afin d'obtenir un différentiel 2014-2011 homogène et issu d'un seul mode de calcul.

C'est ce MNT retravaillé qui est utilisé comme référence 2011 dans le cadre de l'Observatoire de la Côte Aquitaine.

Les dalles du MNT de 1 km² et au pas de 1 m sont au format ascii.

Il est conçu pour une utilisation à des échelles comprises entre 1:1 000 et 1:50 000.</gco:CharacterString>
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