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<idAbs>Classification en 6 niveaux des déperditions thermiques des toitures mesurées à l'aide d'une caméra embarquée sur hélicoptère. &lt;br /&gt;&lt;br /&gt;Les données sont acquises à 500 mètres d'altitude à une vitesse de 70 à 120 km/h à l'aide d'une caméra infrarouge thermique centrée sur 9,75 microns.&lt;br /&gt;&lt;br /&gt;L'information thermique acquise est retraitée après la reclassification afin de tenir compte de l'environnement proche des bâtiments (présence d'arbres, relief, etc.)&lt;br /&gt;&lt;br /&gt;L'attribut NIVEAU_DEPERDITION renseigne le niveau de déperdition thermique. Objectif Vol hélicoptère effectué les 16 et 17 mars 2009, entre 7h00 et 8h30, hygrométrie 65%, temp. ext. au sol 0 à -1°C, vitesse du vent 2km/h NNE. &lt;br /&gt;Aucune précipitation depuis 120 heures</idAbs>
<searchKeys>
<keyword>Constructions et ouvrages</keyword>
<keyword>Environnement</keyword>
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<idPurp>Rayonnement thermique des toitures</idPurp>
<idCredit>© 2026 SITG</idCredit>
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<useLimit>Accès libre &lt;br /&gt;&lt;br /&gt; None</useLimit>
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<resTitle>Rayonnement thermique des toitures</resTitle>
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