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                Les données couvrent les façades françaises : Atlantique/Manche/Mer du Nord, Méditerranée, Antilles-Guyane et les îles de Mayotte et de La Réunion.
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                            Les modèles développés, dont les résultats sont affichés sur ce portail, sont ceux exploités et analysés par les prévisionnistes de Météo-France dans le cadre du système national français de vigilance vagues-submersion.</gco:CharacterString>
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        <gco:CharacterString>Les prévisions de surcote et niveaux d'eau sont actualisées une fois par jour pour la Métropole (quatre jours de prévision) et deux fois par jour à l'Outre-Mer (2 jours de prévision).
                Définitions :
                - Niveau moyen : le niveau moyen serait le niveau de la mer au repos, notamment en l'absence des variations engendrées par la marée, le vent et sous une pression atmosphérique moyenne de 1013 hPa (à ne pas confondre avec le zéro des cartes ou zéro hydrographique, ZH).
                - Surcote : en présence de phénomènes météorologiques (dépressions, vent...) ou océanographiques (vagues, houle, courants...), le niveau de la mer peut s'écarter notablement de la valeur attendue en l'absence de ces perturbations i.e. sous la seule influence de la marée. Lorsque le niveau est supérieur à la prédiction, on parle de surcote ; lorsqu'il est inférieur, de décote. L'importance des surcotes et décotes dépend au premier ordre des conditions météorologiques (vent et pression atmosphérique), mais également du lieu considéré (topographie des fonds marins, courants, exposition aux vagues et à la houle...).
                Lorsqu'une surcote se produit au voisinage d'une pleine mer en période de vives-eaux, il existe un risque important de submersion des zones côtières vulnérables.</gco:CharacterString>
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            <gmd:LocalisedCharacterString locale="#EN">Water level/surge forecasts availableare daily updated in metropolitain France (1h steps until D+3 (23h00UTC), and updated twice a day in overseas territories (1h steps until D+2).
                        Glossary:
                        - Mean sea level: average level of the sea at rest, in the absence of variations caused by tides and wind, and under an average atmospheric pressure of 1013 hPa. It should not be confused with the chart datum or hydrographic zero.
                        - Storm surge / positive sea-level anomaly: In the presence of meteorological phenomena (low-pressure systems, wind, etc.) or oceanographic phenomena (waves, swell, currents, etc.), the sea level may deviate significantly from the expected value in the absence of these disturbances, i.e. under the sole influence of the tide. When the observed sea level is higher than predicted, this is referred to as a storm surge; when it is lower, it is referred to as a negative sea-level anomaly. The magnitude of these positive and negative anomalies depends primarily on weather conditions (wind and atmospheric pressure), but also on the location in question (seabed topography, currents, exposure to waves and swell, etc.).
                        When a storm surge occurs near high tide during a spring tide, there is a significant risk of flooding of vulnerable coastal areas.</gmd:LocalisedCharacterString>
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        <gmd:MD_DigitalTransferOptions>
          <gmd:onLine>
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              <gmd:name xsi:type="gmd:PT_FreeText_PropertyType">
                <gco:CharacterString>Portail d'information géographique du Shom</gco:CharacterString>
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                    <gmd:LocalisedCharacterString locale="#EN">Shom Geoportal</gmd:LocalisedCharacterString>
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                    <gmx:Anchor xlink:href="http://data.europa.eu/eli/reg/2010/1089/oj">COMMISSION REGULATION (EU) No 1089/2010 of 23 November 2010 implementing Directive 2007/2/EC of the European Parliament and of the Council as regards interoperability of spatial data sets and services</gmx:Anchor>
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                        <gmd:LocalisedCharacterString locale="#EN">COMMISSION REGULATION (EU) No 1089/2010 of 23 November 2010 implementing Directive 2007/2/EC of the European Parliament and of the Council as regards interoperability of spatial data sets and services</gmd:LocalisedCharacterString>
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                    <gco:CharacterString>INSPIRE Data Specification on Oceanographic geographical features – Technical Guidelines v3.0</gco:CharacterString>
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                        <gco:Date>2013-12-10</gco:Date>
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                    <gmd:LocalisedCharacterString locale="#EN">Information on the compliance of the resource with a specification (INSPIRE).</gmd:LocalisedCharacterString>
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          <gmd:statement xsi:type="gmd:PT_FreeText_PropertyType">
            <gco:CharacterString>Pour modéliser les niveaux d'eau, le Shom utilise deux codes numériques: une version barotrope (2D) du code HYCOM (https://hycom.org/) configuré sur les 3 domaines Méditerranée, Antilles-Guyane et Océan Indien, et le code Shallow Water de Tolosa (https://tolosa-project.com/, SHOM/INSA Toulouse), Tolosa-SW, configuré sur le domaine Atlantique/Manche/Mer du Nord. 
                        Ces modèles ont été adaptés par le Shom à la modélisation des zones côtières par la prise en compte, notamment, du forçage par la marée, de paramétrisations optimisées et de bathymétries spécifiques haute résolution en zone côtière (de 500 m pour les emprises régionales à 100 m pour les MNT de façade) utilisant notamment les levés Litto3D par LIDAR aéroportés.
                        Les configurations HYCOM utilisent des grilles curvilinéaires à résolution variable atteignant 1.5 km sur les côtes françaises méditerranéennes et sur la façade Antilles-Guyane. Une descente d'échelle par imbrications permet une résolution de 200 m à 800 m sur le domaine Indien. La configuration Tolosa-SW sur la façade Atlantique utilise une grille non structurée d'une résolution côtière allant de 100 à 200 m.
                        Ce modèle s’appuie sur les prévisions de vent et de pression atmosphérique issues de : (i) modèle Arpege de Météo-France (grille EURAT01, résolution de 0,1°) pour la métropole, (ii) modèles régionaux Arome Outre-mer de Météo-France (grilles CARAIB0025, GUYANE0025, INDIEN0025, résolution de 0.025°) et (iii) modèle CEP-IFS de l'ECMWF (grille GLOB0125) pour l'outre-mer.
                        Aux frontières ouvertes, le forçage de marée utilisé est issu de l’atlas de marée NEA pour la France métropolitaine ou du modèle FES du LEGOS pour les domaines outre-mer.
                        Les modèles sont opérés par Météo-France, avec le soutien du Shom, dans le cadre de la Vigilance Vagues-Submersion. 
                        Version de configurations utilisées :
                        -	Configuration TOLOSA-ATL, V1 octobre 2024 (façade Manche-Atlantique de la France métropolitaine).
                        -	Configuration HYCOM-MED, V2 janvier 2015 (façade méditerranéenne de la France métropolitaine).
                        -	Configuration HYCOM ANT-GUY, V2 mai 2020 (façades des Antilles – Saint-Barthélemy, Guadeloupe et Martinique – et de la Guyane).
                        -	Configuration HYCOM-IND, V2 décembre 2019 (Océan indien autour des îles de La Réunion et Mayotte).</gco:CharacterString>
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                <gmd:LocalisedCharacterString locale="#EN">In order to compute water level /storm surge forecasts, the Shom uses the Shom uses two numerical codes: a barotropic (2D) version of the HYCOM code (https://hycom.org/) configured for the 3 Mediterranean, Antilles-Guyane and Indian Ocean domains, and Tolosa's Shallow Water code (https://tolosa-project.com/, SHOM/INSA Toulouse), Tolosa-SW, configured for the Atlantic/Channel/North Sea domain.
                                These models have been adapted by Shom to address coastal issues by taking into account, the tide forcing, optimized parameterizations and dedicated high resolution bathymetry (from 500 m for regional coverage to 100 m for coastal DTMs) using Litto3D surveys by airborne LIDAR.
                                HYCOM configurations use curvilinear grids with variable resolution, enabling coastal resolutions of 1.5 km on the French mediterranean coasts and on the Antilles-Guyane coast; downscaling by embedded grids enables resolution from 200 m to 800 m over the Indian domain. The Tolosa-SW configuration on the Atlantic coast uses an unstructured grid with a coastal resolution of 100 to 200 m. 
                                Meteorological forcing: (i) ARPEGE model (EURAT01 grid) from Météo-France for French mainland area, (ii) AROME models (CARAIB0025, GUYANE0025, INDIEN0025 grids) from Météo-France and (ii) CEP-IFS model (GLOB0125 grid) from ECMWF for overseas areas.
                                Open boundary forcing: NEA tidal atlas or LEGOS FES according to the considered area.
                                The models are operated by Météo-France, with support from Shom, as part of the french waves and storm-tide awareness system.
                                Version of configurations setup depending on the considered area:
                                - Configuration TOLOSA-ATL: Version 1, october 2024.
                                - Configuration HYCOM-MED: Version 2, january 2015.
                                - Configuration HYCOM ANT-GUY: Version 2, may 2020.
                                - Configuration HYCOM-IND: Version 2, december 2019.</gmd:LocalisedCharacterString>
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        <gco:CharacterString>Métadonnées publiques et gratuites</gco:CharacterString>
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            <gmd:LocalisedCharacterString locale="#EN">Metadata publicly available</gmd:LocalisedCharacterString>
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