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L’objectif de ce travail est de fournir une couche d’occupation du sol harmonisée et actualisée pour l’ensemble du littoral. Cette couche d’occupation du sol a également un rôle intermédiaire entre l’IPLI et les futurs travaux qui pourront être fait à partir d’une nouvelle orthophotographie qui est envisagée à l’horizon 2010-2012.

Les données locales, qui ont été récoltées, répondent à des besoins locaux et à des spécificités régionales qui offrent une diversité dans l’information géographique. Pour pouvoir créer une base de données nationale de l’occupation du sol, il a fallu entreprendre un travail d’harmonisation des nomenclatures et des unités minimales de collecte.
La nomenclature Corine Land Cover a servi de référence.

Cette nouvelle base de données d’occupation du sol du littoral 2000-2006 "Litto_MOS" est mise en ligne sur le site du Géolittoral.
Deux niveaux d'affichage sont disponibles:
1 - Une cartographie nationale au 1/25 000 (affichage optimal de l’information) avec une nomenclature du deuxième niveau de Corine Land Cover.
2 - Une cartographie départementale avec une information détaillée au quatrième niveau. Cette cartographie permet de conserver les spécificités régionales et la richesse de ces travaux.</gco:CharacterString>
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Reconstituer un Inventaire Permanent du Littoral (IPLI) national en s’appuyant autant que faire se peut sur les données d’occupation du Sol existantes localement.
Pour cela deux conditions étaient indispensable :
harmonisation des nomenclatures
harmonisation des unités minimales de collecte

La nomenclature Corine Land Cover a servi de référence.

Généalogie des données :
Les données ont été recueillies auprès des services gestionnaires ou producteurs :
le Conseil régional du Nord-Pas-de-Calais, la DRE Bretagne, la DDE de la Vendée, la DRE Aquitaine, SIG L-R (Systèmes d’Informations Géographiques en Languedoc Roussillon) et le CRIGE-PACA (Centre Régional de l’Information Géographique de Provence-Alpes-Côte d’Azur).

Les nomenclatures ont été harmonisées sur la base de la nomenclature Corine Land Cover. Pour conserver la richesse des postes, un niveau 4 a pu être créé ponctuellement.
Ce travail d’harmonisation a permis d’établir des passerelles entre les données d’origine et la nouvelle nomenclature dénommée litto-MOS.
Ces passerelles effectuées, un travail de vérification des correspondances à la limite des départements a été effectué.

La couche d’occupation du sol Litto-MOS au niveau détaillé est découpé en plusieurs couches qui sont homogènes en précision, en date et en terme de postes dans la nomenclature.</gco:CharacterString>
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