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                  <gco:CharacterString>Analyse géomorphologique de la pente continentale de la façade méditerranéenne réalisée sur la base d'un modèle numérique de terrain (MNT) bathymétrique au pas 100m produit à partir de la compilation des données acquises lors de plusieurs campagnes à la mer.

La classification géomorphologique est celle développée pour les cartes géomorphologiques au 1/100.000 dans le cadre du projet européen CoralFish du 7èPCRD (Bourillet  J-F. (Coord.), de Chambure L., Loubrieu B., 2012. Sur les traces des coraux d'eau froide du golfe de Gascogne. 8 cartes bathymorphologiques et géomorphologiques au 1/100.000. Cold water corals of the Bay of Biscay: 8 bathymorphological and geomorphological maps at 1:100,000., Editions Quae ed.).

 Elle est basée sur des méthodes géostatistiques (de Chambure L., Bourillet, J-F., Bartel, C., 2013, Geomorphological classification in Bay of Biscay. Morpho-sedimentary mapping of the seabed in selected areas. Rapport INT. Ifremer-REM/GM/LES, 51p.).

Les paramètres directement dérivés de la bathymétrie (bathymétrie moyenne, pente régionale et ponctuelle, …) permet la délimitation des grands secteurs physiographiques ou mégagéoformes comme le plateau, la pente et le glacis.

Des paramètres plus complexes (réseaux de drainage, thalwegs, distance pondérée au plus proche thalweg) mettent en évidence les structures géologiques : sur la marge septentrionale du golfe de Gascogne, les canyons sont des éléments majeurs du modelé du fond marin (Bourillet et al., 2006). Ces paramètres permettent de distinguer les zones de canyon et de celles d’interfluve.

Les éléments kilométriques à décamétriques (méso- et macrogéoformes) des zones de canyon (lit, flanc, chute, ravine, …) et des interfluves (crête, éperon, terrasse, escarpement, …) sont classés en contrôlant leur connexité. Ces géoformes sont identifiées selon le standard du CMECS, Coastal and Marine Ecological Classification Standard (Madden, C, et al., 2008. Coastal and Marine Ecological classification Standard. NOAA and NatureServe. 77p. ; Greene, H.G., et al., 2007a. Construction of digital potential marine benthic habitat maps using a coded classification scheme and its application. In: B.J. Todd and H.G. Greene (eds.), Mapping the seafloor for habitat characterization. Geol. Assoc. Can. Spec. Pap. 47, pp. 141-155).

Fichier de forme issu de la transformation du raster (produit par le logiciel Isatis) en polygones à l'aide de l'outil de conversion "Raster to polygon" du logiciel ArcGis, avec "outil de simplification des polygones" activé.

Un polygone de "terrasse interfluviale &lt; 4° " est supprimé autour de la Corse, car incohérent.</gco:CharacterString>
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                        <gmd:LocalisedCharacterString locale="#FR">Analyse géomorphologique de la pente continentale de la façade méditerranéenne réalisée sur la base d'un modèle numérique de terrain (MNT) bathymétrique au pas 100m produit à partir de la compilation des données acquises lors de plusieurs campagnes à la mer.

La classification géomorphologique est celle développée pour les cartes géomorphologiques au 1/100.000 dans le cadre du projet européen CoralFish du 7èPCRD (Bourillet  J-F. (Coord.), de Chambure L., Loubrieu B., 2012. Sur les traces des coraux d'eau froide du golfe de Gascogne. 8 cartes bathymorphologiques et géomorphologiques au 1/100.000. Cold water corals of the Bay of Biscay: 8 bathymorphological and geomorphological maps at 1:100,000., Editions Quae ed.).

 Elle est basée sur des méthodes géostatistiques (de Chambure L., Bourillet, J-F., Bartel, C., 2013, Geomorphological classification in Bay of Biscay. Morpho-sedimentary mapping of the seabed in selected areas. Rapport INT. Ifremer-REM/GM/LES, 51p.).

Les paramètres directement dérivés de la bathymétrie (bathymétrie moyenne, pente régionale et ponctuelle, …) permet la délimitation des grands secteurs physiographiques ou mégagéoformes comme le plateau, la pente et le glacis.

Des paramètres plus complexes (réseaux de drainage, thalwegs, distance pondérée au plus proche thalweg) mettent en évidence les structures géologiques : sur la marge septentrionale du golfe de Gascogne, les canyons sont des éléments majeurs du modelé du fond marin (Bourillet et al., 2006). Ces paramètres permettent de distinguer les zones de canyon et de celles d’interfluve.

Les éléments kilométriques à décamétriques (méso- et macrogéoformes) des zones de canyon (lit, flanc, chute, ravine, …) et des interfluves (crête, éperon, terrasse, escarpement, …) sont classés en contrôlant leur connexité. Ces géoformes sont identifiées selon le standard du CMECS, Coastal and Marine Ecological Classification Standard (Madden, C, et al., 2008. Coastal and Marine Ecological classification Standard. NOAA and NatureServe. 77p. ; Greene, H.G., et al., 2007a. Construction of digital potential marine benthic habitat maps using a coded classification scheme and its application. In: B.J. Todd and H.G. Greene (eds.), Mapping the seafloor for habitat characterization. Geol. Assoc. Can. Spec. Pap. 47, pp. 141-155).

Fichier de forme issu de la transformation du raster (produit par le logiciel Isatis) en polygones à l'aide de l'outil de conversion "Raster to polygon" du logiciel ArcGis, avec "outil de simplification des polygones" activé.

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                        <gmd:LocalisedCharacterString locale="#EN">Geomorphological analysis of the continental slope of the Mediterranean sea based on a 100m Data Terrain Model (DTM). This DTM is a synthesis of data acquired during sea surveys.

The geomorphological classification was developed for the geomorphological maps at a scale of 1.100,000 in the framework of the European FP7 project Coralfish (Bourillet  J-F. (Coord.), de Chambure L., Loubrieu B., 2012. Sur les traces des coraux d'eau froide du golfe de Gascogne. 8 cartes bathymorphologiques et géomorphologiques au 1/100.000. Cold water corals of the Bay of Biscay: 8 bathymorphological and geomorphological maps at 1:100,000., Editions Quae ed.).

It is base on geostatistical methods (de Chambure L., Bourillet, J-F., Bartel, C., 2013, Geomorphological classification in Bay of Biscay. Morpho-sedimentary mapping of the seabed in selected areas. Rapport INT. Ifremer-REM/GM/LES, 51p.).

Parameters, directly derived from the bathymetry (average depth, regional and local slope, …) allow the delimitation of the main physiographic sectors (megageoforms) such as shelf, slope and continental rise.

More complex parameters (drainage networks, thalwegs, weighted distance to the nearest thalweg) point out the geological structures : on the northern continental margin of theBay of Biscay, canyons are major elements of the shape of the sea floor (Bourillet et al., 2006). These parameters are used to differentiate canyons to interfluves areas.

Meso and macrogeoforms (km and 10xkm) are then classified within the canyon areas (river bed, flank, fall, gully, …) and the interfluve areas (crest, terrace, escarpment, …) and their connectivity is checked. These geoforms are also identified accordoing to the CMECS standard, Coastal and Marine Ecological Classification Standard (Madden, C, et al., 2008. Coastal and Marine Ecological classification Standard. NOAA and NatureServe. 77p. ; Greene, H.G., et al., 2007a. Construction of digital potential marine benthic habitat maps using a coded classification scheme and its application. In: B.J. Todd and H.G. Greene (eds.), Mapping the seafloor for habitat characterization. Geol. Assoc. Can. Spec. Pap. 47, pp. 141-155).

Shapefile was built from geostatistical interpretation DTM (Isatis software) using conversion tool "Raster to polygon" from ArcGIS software with the option "simplify polygons" ticks.</gmd:LocalisedCharacterString>
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