{"id":11064,"date":"2010-11-22T11:35:39","date_gmt":"2010-11-22T16:35:39","guid":{"rendered":"http:\/\/www.cec.org\/north-american-environmental-atlas\/eclairage-nocturne\/"},"modified":"2025-05-06T17:48:14","modified_gmt":"2025-05-06T21:48:14","slug":"eclairage-nocturne","status":"publish","type":"maps","link":"https:\/\/www.cec.org\/fr\/atlas-environnemental-de-lamerique-du-nord\/eclairage-nocturne\/","title":{"rendered":"\u00c9clairage nocturne"},"content":{"rendered":"

Cette carte repr\u00e9sente l'\u00e9clairage nocturne en Am\u00e9rique du Nord, incluant les Cara\u00efbes.<\/p>\n

Les donn\u00e9es ont \u00e9t\u00e9 recueillies en 1996 et 1997 dans le cadre du Defense Meteorological Satellite Program <\/em>(DMSP, Programme de satellites m\u00e9t\u00e9orologiques de d\u00e9fense) des \u00c9tats-Unis.<\/p>\n

Le DMSP cr\u00e9e une imagerie visible et infrarouge de la couverture nuageuse, et surveille les environnements atmosph\u00e9riques, oc\u00e9anographiques, hydrologiques, cryosph\u00e9riques et circumterrestres. Il maintient en orbite quasi polaire deux satellites h\u00e9liosynchrones. La p\u00e9riode orbitale est de 101 minutes et l'inclinaison, de 99 degr\u00e9s. Les capteurs atmosph\u00e9riques et oc\u00e9anographiques enregistrent les variations \u00e0 une longueur d'onde visible, infrarouge et hyperfr\u00e9quence. Les capteurs solaires g\u00e9ophysiques mesurent les flux de plasma ionosph\u00e9rique, sa densit\u00e9, sa temp\u00e9rature et sa v\u00e9locit\u00e9. L'image ci-dessus a \u00e9t\u00e9 cr\u00e9\u00e9e durant les p\u00e9riodes suivantes\u00a0: 16-21 mars 1996, 5-14 janvier 1997 et 3-12 f\u00e9vrier 1997. Durant ces p\u00e9riodes on a abaiss\u00e9 le gain du capteur OLS (syst\u00e8me op\u00e9rationnel de balayage de lignes) de 64 d\u00e9cibels (valeur normale) \u00e0 24, de sorte que les centres urbains ne saturent pas le signal.<\/p>\n

Les donn\u00e9es ont \u00e9t\u00e9 compil\u00e9es par le National Atlas of the United States. Il s'agit d'une version r\u00e9vis\u00e9e de la couche cartographique cr\u00e9\u00e9e en mai 2002, qui comprend une nouvelle repr\u00e9sentation des c\u00f4tes du Groenland.<\/p>\n

Higher intensity = Forte intensit\u00e9
\nLower intensity = Faible intensit\u00e9
\nHawaii = Hawa\u00ef (\u00c9.-U.)
\n1,000 km = 1\u00a0000 km<\/p>\n","protected":false},"excerpt":{"rendered":"

Cette carte repr\u00e9sente l’\u00e9clairage nocturne en Am\u00e9rique du Nord, incluant les Cara\u00efbes. Les donn\u00e9es ont \u00e9t\u00e9 recueillies en 1996 et 1997 dans le cadre du Defense Meteorological Satellite Program (DMSP, Programme de satellites m\u00e9t\u00e9orologiques de d\u00e9fense) des \u00c9tats-Unis. Le DMSP cr\u00e9e une imagerie visible et infrarouge de la couverture nuageuse, et surveille les environnements atmosph\u00e9riques, […]<\/p>\n","protected":false},"featured_media":62184,"template":"","class_list":["post-11064","maps","type-maps","status-publish","has-post-thumbnail","hentry","map_type-influence-humaine","map_keyword-humains"],"acf":[],"yoast_head":"\n\u00c9clairage nocturne<\/title>\n<meta name=\"description\" content=\"Cette carte repr\u00e9sente l'\u00e9clairage nocturne en Am\u00e9rique du Nord, incluant les Cara\u00efbes. 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