{"id":7663,"date":"2023-11-15T13:42:23","date_gmt":"2023-11-15T11:42:23","guid":{"rendered":"https:\/\/tethys.farm\/?p=7663"},"modified":"2023-11-15T14:19:53","modified_gmt":"2023-11-15T12:19:53","slug":"correction-du-masquage-des-nuages-atmospheriques-2","status":"publish","type":"post","link":"https:\/\/tethys.farm\/fr\/correction-du-masquage-des-nuages-atmospheriques-2\/","title":{"rendered":"Pr\u00e9traitement des images satellites : correction atmosph\u00e9rique et masquage des nuages"},"content":{"rendered":"
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Le Syst\u00e8me T\u00c9THYS<\/strong> traite les donn\u00e9es d\u2019observation de la Terre acquises par Satellites de l'ESA<\/strong> (Sentinel 2a et 2b) et de NASA<\/strong> (Landsat 8 et 9) gr\u00e2ce \u00e0 des capteurs optiques de derni\u00e8re g\u00e9n\u00e9ration. Les donn\u00e9es, c'est-\u00e0-dire les images acquises, devront subir un pr\u00e9traitement concernant la correction atmosph\u00e9rique<\/strong> et le masquage des nuages<\/strong>.<\/p>

Comment les donn\u00e9es sont-elles acquises ?<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t

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LE capteurs optiques<\/strong> ils mesurent le quantit\u00e9 de lumi\u00e8re solaire r\u00e9fl\u00e9chie<\/strong> de la surface de la Terre \u00e0 diff\u00e9rentes longueurs d'onde.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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Le\u00a0un rayonnement \u00e9lectromagn\u00e9tique<\/strong>\u00a0du soleil, lors de leur voyage vers le sol puis du sol vers le capteur, ils traversent l'atmosph\u00e8re et\u00a0interagir avec des mol\u00e9cules gazeuses<\/strong>, les particules en suspension et l'a\u00e9rosol qui le composent, changeant.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t

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L\u00e0 radiation solaire<\/strong> vient alors modifi\u00e9 lors de son passage dans l'atmosph\u00e8re<\/strong> (absorption et diffusion) et il est donc n\u00e9cessaire de r\u00e9aliser une correction des donn\u00e9es<\/strong> qui sont \u00e9mises par les satellites avant de pouvoir \u00eatre trait\u00e9es, supprimant ainsi les effets de brume lumineuse, de vapeur d'eau, etc.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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Le syst\u00e8me TETHYS r\u00e9alise le correction atmosph\u00e9rique<\/strong> d'images satellites en utilisant<\/strong> pr\u00e9cis\u00e9ment lui algorithmes d\u00e9velopp\u00e9s par l'ESA<\/strong> (Bo\u00eete \u00e0 outils Sentinel-2\u00a0; Sen2Cor) e par la NASA<\/strong> (Code de r\u00e9flectance de la surface terrestre\u00a0: LaSRC), donc offrir \u00e0 ses utilisateurs un traitement toujours fiable et coh\u00e9rent<\/strong>.<\/p>

Tous les ph\u00e9nom\u00e8nes atmosph\u00e9riques ne peuvent pas<\/strong> toutefois \u00eatre soumis \u00e0 une correction atmosph\u00e9rique<\/strong>, comme dans certains cas (par exemple couches nuageuses plus compactes et plus r\u00e9pandues), le signal de r\u00e9flectance<\/strong> est consid\u00e9rablement modifi\u00e9. Il est donc n\u00e9cessaire d'op\u00e9rer un classification des pixels<\/strong> qui composent une image, en distinguant ceux qui ne peuvent pas \u00eatre utilis\u00e9s pour le traitement en raison des nuages (en gris sur la figure ci-dessous \u00e0 droite) et des ombres des nuages (en noir) de ceux qui ne sont pas affect\u00e9s par des ph\u00e9nom\u00e8nes atmosph\u00e9riques s\u00e9v\u00e8res (pixels marron sur la figure) .<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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Chaque image satellite acquise par TETHYS est alors \u00e9galement soumise \u00e0 masquage des nuages<\/strong> (masquage des nuages), avec moi pixels identifi\u00e9s comme \u00ab\u00a0alt\u00e9r\u00e9s\u00a0\u00bb<\/strong> qui sont marqu\u00e9s de couleur grise et ne sont pas pris en compte dans les diff\u00e9rentes analyses.

M\u00eame dans le cas du cloud-masking, TETHYS utilise des algorithmes d\u00e9velopp\u00e9s par l'ESA (Sen2Cor) et la NASA (Fmask et ATCOR) pour fournir \u00e0 ses utilisateurs des traitements et des images toujours utiles et fiables.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<\/div>","protected":false},"excerpt":{"rendered":"

TETHYS r\u00e9alise la correction atmosph\u00e9rique et le masquage nuageux des images satellites afin de toujours fournir un traitement fiable et coh\u00e9rent.<\/p>","protected":false},"author":2,"featured_media":7670,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"footnotes":""},"categories":[84],"tags":[64,62,61,63,65],"class_list":["post-7663","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-scheda-tecnica","tag-agricoltura-4-0","tag-agricoltura-di-precisione","tag-monitoraggio-satellitare","tag-precision-farming","tag-satelliti"],"yoast_head":"\nIl pre-trattamento delle immagini satellitari: correzione atmosferica e cloud-masking - TETHYS<\/title>\n<meta name=\"description\" content=\"TETHYS effettua la correzione atmosferica e il cloud-masking delle immagini satellitari in modo da fornire elaborazioni sempre affidabili e coerenti.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/tethys.farm\/fr\/correction-du-masquage-des-nuages-atmospheriques-2\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Il pre-trattamento delle immagini satellitari: correzione atmosferica e cloud-masking - TETHYS\" \/>\n<meta property=\"og:description\" content=\"TETHYS effettua la correzione atmosferica e il cloud-masking delle immagini satellitari in modo da fornire elaborazioni sempre affidabili e coerenti.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/tethys.farm\/fr\/correction-du-masquage-des-nuages-atmospheriques-2\/\" \/>\n<meta property=\"og:site_name\" content=\"TETHYS\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/people\/Tethys\/61551049833155\/\" \/>\n<meta property=\"article:published_time\" content=\"2023-11-15T11:42:23+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2023-11-15T12:19:53+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/tethys.farm\/wp-content\/uploads\/2023\/11\/correzione-atmosferica-cloud-masking-cover-scaled.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"2560\" \/>\n\t<meta property=\"og:image:height\" content=\"1707\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"author\" content=\"Matteo De Sanctis\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"\u00c9crit par\" \/>\n\t<meta name=\"twitter:data1\" content=\"Matteo De Sanctis\" \/>\n\t<meta name=\"twitter:label2\" content=\"Dur\u00e9e de lecture estim\u00e9e\" \/>\n\t<meta name=\"twitter:data2\" content=\"3 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\/\/tethys.farm\/correzione-atmosferica-cloud-masking\/#article\",\"isPartOf\":{\"@id\":\"https:\/\/tethys.farm\/correzione-atmosferica-cloud-masking\/\"},\"author\":{\"name\":\"Matteo De Sanctis\",\"@id\":\"https:\/\/tethys.farm\/#\/schema\/person\/8bf03b3dd5f6f65169de4497fca14728\"},\"headline\":\"Il pre-trattamento delle immagini satellitari: correzione atmosferica e cloud-masking\",\"datePublished\":\"2023-11-15T11:42:23+00:00\",\"dateModified\":\"2023-11-15T12:19:53+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\/\/tethys.farm\/correzione-atmosferica-cloud-masking\/\"},\"wordCount\":345,\"commentCount\":0,\"publisher\":{\"@id\":\"https:\/\/tethys.farm\/#organization\"},\"image\":{\"@id\":\"https:\/\/tethys.farm\/correzione-atmosferica-cloud-masking\/#primaryimage\"},\"thumbnailUrl\":\"https:\/\/tethys.farm\/wp-content\/uploads\/2023\/11\/correzione-atmosferica-cloud-masking-cover-scaled.jpg\",\"keywords\":[\"agricoltura 4.0\",\"agricoltura di precisione\",\"Monitoraggio satellitare\",\"precision farming\",\"satelliti\"],\"articleSection\":[\"Scheda tecnica\"],\"inLanguage\":\"fr-FR\",\"potentialAction\":[{\"@type\":\"CommentAction\",\"name\":\"Comment\",\"target\":[\"https:\/\/tethys.farm\/correzione-atmosferica-cloud-masking\/#respond\"]}]},{\"@type\":\"WebPage\",\"@id\":\"https:\/\/tethys.farm\/correzione-atmosferica-cloud-masking\/\",\"url\":\"https:\/\/tethys.farm\/correzione-atmosferica-cloud-masking\/\",\"name\":\"Il pre-trattamento delle immagini satellitari: correzione atmosferica e cloud-masking - 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