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        <gco:CharacterString>Carte de température du 14 au 17 août 2025 en projection Lambert-93 sur la région Auvergne-Rhône-Alpes (67588 km²) à la résolution de 30 m (100 m natif). L'emprise comprend également les communes nivernaises de Moulins Communauté ainsi que le canton de Valréas.

Elle se présente sous la forme d'un raster en niveaux de gris, dont la valeur de pixel représente la température de surface en °C mesurée lors d'une vague de chaleur à la mi-journée (12h15~12h30).

L'image est fournie assemblée en dalle unique, au format COG compressé Deflate, représentant un volume de 226 Mo.
Elle est accompagnée d'un tableau des sources sous forme de polygones au format GeoPackage, contenant des informations sur la date et l'heure d'acquisition ainsi que le ratio de couverture de chaque commune en %.

Sa production a été réalisée à partir des données Landsat Collection 2 Surface Temperature utilisant des images satellites pour la mesure de la température de surface terrestre (LST). Elles sont la combinaison des bandes infrarouges thermique Landsat C2 L1, de données sur le sommet de l'atmosphère (température de brillance, réflectivité), de données ASTER (émissivité GED, NDVI) et de différents paramètres atmosphériques issus du modèle GEOS.

Le raster final résulte d'un assemblage des données disponibles sur la vague de chaleur ayant touché la France du 8 au 18 août 2025.

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- des zones sans données liées à une absence de retour infrarouge ou à la présence de nuages
- des disparités de température entre territoires adjacents dues aux conditions météorologiques hétérogènes entre dates d'acquisition.

Cette carte de température a été réalisée en interne par le CRAIG à partir de données acquises entre les 14 et 17 août 2025 par le Thermal InfraRed Sensor (TIRS) des satellites Landsat 8-9. Les données exploitent la bande 10 située dans la gamme des infrarouges lointains (LWIR / 10,6-11,19 μm).</gco:CharacterString>
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Échelle de 0 à 50°C.</gco:CharacterString>
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