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Leur production est réalisée à partir des données Landsat Collection 2 Surface Temperature mises à disposition par l'U.S. Geological Survey. Elles combinent les données des bandes infrarouges thermique Landsat C2 L1, des données sur le sommet de l'atmosphère (température de brillance, réflectivité), des données ASTER (émissivité GED, NDVI) et différents paramètres atmosphériques issus du modèle GEOS. 

L'ensemble est traité en interne par le CRAIG afin de produire un assemblage régional filtré des nuages et re-projeté en Lambert-93.

Ce traitement est réalisé dans le cadre de projets de thermographie estivale menés depuis 2024 sur certains territoires de la région Auvergne-Rhône-Alpes. L'objectif de ces travaux est de fournir des données sur le réchauffement diurne et le refroidissement nocturne en milieu urbain lors d'épisodes de canicule. L'idée étant notamment d'identifier les Îlots de Chaleur Urbains (ICU) et la contribution des différentes surfaces (matériaux, couleurs, présence de végétation, etc.) à ces phénomènes.

ThermoSAT a ainsi été initié pour compléter les données aériennes acquises et offrir une vision d'ensemble des températures diurnes. La production est calée sur la disponibilité d'images satellite concomitantes aux thermographies aériennes. La mise à jour est prévue sur un rythme annuel et sur demande des partenaires du CRAIG.</gco:CharacterString>
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