{"id":9292,"date":"2024-02-14T18:14:38","date_gmt":"2024-02-14T16:14:38","guid":{"rendered":"https:\/\/tethys.farm\/?p=9292"},"modified":"2024-02-14T18:55:28","modified_gmt":"2024-02-14T16:55:28","slug":"lavenir-de-lagriculture-de-precision-a-fieragricola-7","status":"publish","type":"post","link":"https:\/\/tethys.farm\/fr\/lavenir-de-lagriculture-de-precision-a-fieragricola-7\/","title":{"rendered":"Constellation Sentinel : en mission pour observer la Terre"},"content":{"rendered":"
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Copernic<\/a> Il s\u2019agit d\u2019un programme g\u00e9r\u00e9 par l\u2019Union europ\u00e9enne et leAgence spatiale europ\u00e9enne<\/strong>, ESA<\/a>, qui traite de la construction et de la gestion une flotte de satellites d'observation de la Terre appel\u00e9e Sentinel<\/strong>. Cette constellation de satellites est compos\u00e9e de diverses missions<\/strong>, chacun ayant une t\u00e2che sp\u00e9cifique de surveillance des conditions terrestres<\/strong>. Par exemple, Sentinel-1 est un satellite qui fournit des images radar \u00e0 haute r\u00e9solution pour l\u2019observation des terres, des mers et des zones polaires ; son lancement en 2014<\/strong> marqu\u00e9 leD\u00e9but du programme Copernicus<\/strong>.<\/p>

Chaque satellite de la constellation est optimis\u00e9 pour une mission d'observation sp\u00e9cifique<\/strong> et recueille des donn\u00e9es sur divers aspects environnementaux tels que l\u2019atmosph\u00e8re, l\u2019eau, le sol et la v\u00e9g\u00e9tation. Les donn\u00e9es collect\u00e9es par les satellites Sentinel sont utilis\u00e9es dans divers secteurs, tels queagriculture,<\/strong> Le surveillance environnementale<\/strong>, le gestion des catastrophes naturelles<\/strong> et le contr\u00f4le des ressources en eau<\/strong>, pour n'en citer que quelques-uns.<\/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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La constellation Sentinel, un p\u00f4le crucial pour l'observation de la Terre<\/h2>

Lanc\u00e9e entre 2014 et 2020, la flotte Sentinel se compose de six types de satellites diff\u00e9rents, chacun dot\u00e9 une t\u00e2che <\/strong>et unorbite sp\u00e9cifique<\/strong>:<\/p>

\u2022 Sentinelle-1<\/strong>: un nouveau regard sur la Terre<\/strong>.
Ce satellite utilise les donn\u00e9es SAR (Synthetic Aperture Radar) pourobservation du territoire<\/strong>. Gr\u00e2ce \u00e0 sa capacit\u00e9 \u00e0 p\u00e9n\u00e9trer les nuages et \u00e0 observer la surface de la Terre dans toutes les conditions m\u00e9t\u00e9orologiques, Sentinel-1 fournit des informations pr\u00e9cieuses pour l' surveillance des \u00e9v\u00e9nements naturels<\/strong> (comme les tremblements de terre, les \u00e9ruptions volcaniques et les inondations) et les activit\u00e9s humaines<\/strong> (comme les activit\u00e9s de transport maritime et de p\u00eache).<\/p>

\u2022 Sentinelle-2<\/strong>: une vision multispectrale pour l'agriculture de pr\u00e9cision<\/strong>.
Sentinel-2 est un autre satellite important de la constellation, gr\u00e2ce \u00e0 son extraordinaire capacit\u00e9 \u00e0 capturer images multispectrales haute r\u00e9solution<\/strong>. Ce instrument<\/strong> c'est particuli\u00e8rement utile en agriculture de pr\u00e9cision<\/strong>, car cela permet identifier avec pr\u00e9cision l'\u00e9tat des cultures, leur \u00e9tat de sant\u00e9 et les dangers ou stress auxquels elles peuvent \u00eatre confront\u00e9es, tels que les maladies, les carences en nutriments ou les conditions de stress hydrique<\/strong>. Gr\u00e2ce \u00e0 Sentinel-2, les agriculteurs sont en mesure de d\u00e9finir strat\u00e9gies sp\u00e9cifiques<\/strong> pour chaque zone du terrain, intervenir de mani\u00e8re cibl\u00e9e uniquement lorsque cela est n\u00e9cessaire<\/strong>, optimisant ainsi l\u2019utilisation des ressources telles que l\u2019eau, les engrais et les pesticides.<\/p>

\u2022 Sentinel-3 : Au-del\u00e0 des fronti\u00e8res de la Terre.<\/strong>
Sentinel-3 est con\u00e7u pour observer les oc\u00e9ans<\/strong> et les masses d'eau<\/strong>. Gr\u00e2ce \u00e0 une s\u00e9rie d\u2019instruments hautement sophistiqu\u00e9s, dont un altim\u00e8tre radar, un spectrom\u00e8tre et un capteur de couleur, Sentinel-3 fournit des donn\u00e9es essentielles sur les temp\u00e9ratures de la mer, la couverture algale et la qualit\u00e9 globale de l\u2019eau. Ces informations sont vitales pour la gestion c\u00f4ti\u00e8re, Surveillance des \u00e9cosyst\u00e8mes marins<\/strong> et l\u2019identification de ph\u00e9nom\u00e8nes tels que l\u2019acidification des oc\u00e9ans. Les donn\u00e9es de Sentinel-3 peuvent \u00eatre utilis\u00e9es pour\u00a0 pr\u00e9venir la pollution c\u00f4ti\u00e8re<\/strong> et d\u00e9velopper des mod\u00e8les de pr\u00e9vision utiles pour r\u00e9agir rapidement aux menaces potentielles pour notre environnement marin<\/strong>.<\/p>

\u2022 Sentinel-4 et Sentinel-5 : la science de l'atmosph\u00e8re.<\/strong>
Sentinel-4 et Sentinel-5 s'int\u00e9ressent principalement \u00e0 laobservation de l'atmosph\u00e8re terrestre<\/strong>. Ces satellites sont \u00e9quip\u00e9s d\u2019instruments tr\u00e8s sensibles qui surveillent en permanence l\u2019atmosph\u00e8re pour qualit\u00e9 de l'air<\/strong>, le pr\u00e9sence de gaz polluants<\/strong> et le dynamique climatique<\/strong>. Ces donn\u00e9es sont essentielles pour mieux comprendre le changement climatique<\/strong>, les \u00e9missions polluantes et le niveau d\u2019ozone dans notre atmosph\u00e8re. En particulier, Sentinelle-5<\/strong> fournit des informations pr\u00e9cieuses pour Gestion des \u00e9missions industrielles, agricoles et v\u00e9hiculaires<\/strong>, contribuant \u00e0 surveiller la pollution de l\u2019air et \u00e0 d\u00e9velopper des politiques environnementales plus durables.<\/p>

\u2022 Sentinel-6 : surveillance du niveau de la mer.<\/strong>
Sentinel-6 est le premier satellite d\u00e9di\u00e9 exclusivement \u00e0 surveillance du niveau de la mer<\/strong>. Ce satellite de derni\u00e8re g\u00e9n\u00e9ration est capable de collecter des donn\u00e9es pr\u00e9cises sur le niveau de la mer, d\u00e9tectant m\u00eame les variations minimes de la surface de l\u2019oc\u00e9an. Ces informations sont d\u2019une importance fondamentale pour comprendre le changement climatique mondial, pr\u00e9dire l'\u00e9l\u00e9vation du niveau de la mer<\/strong> et adopter des mesures pr\u00e9ventives pour la protection des zones c\u00f4ti\u00e8res.<\/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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Comment fonctionnent Sentinel-2A et Sentinel-2B, les satellites d'agriculture de pr\u00e9cision de Copernicus <\/figcaption>\n\t\t\t\t\t\t\t\t\t\t<\/figure>\n\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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Une constellation de pointe<\/h2>

Chacun des satellites Sentinel fait un voyage pr\u00e9cis<\/strong> autour de la Terre, \u00e0 une altitude sp\u00e9cifique dict\u00e9e par sa mission sp\u00e9cifique<\/strong>. \u00c0 bord, capteurs \u00e0 tr\u00e8s haut contenu technologique<\/strong> collecter une vari\u00e9t\u00e9 de donn\u00e9es<\/strong>:imagerie optique haute r\u00e9solution, radar p\u00e9n\u00e9trant les nuages, altim\u00e8tres pour mesurer la hauteur des mers et des glaciers, et radiom\u00e8tres pour sonder l'atmosph\u00e8re.<\/p>

Dans un flux continu d'informations<\/strong>, les donn\u00e9es brutes, acquises sous diff\u00e9rents formats, sont transmises aux stations terrestres Copernicus. L\u00e0, des experts qualifi\u00e9s les transforment en produits utilisables, tels que images g\u00e9or\u00e9f\u00e9renc\u00e9es<\/strong>, cartes th\u00e9matiques<\/strong> et des graphiques d\u00e9taill\u00e9s. Un v\u00e9ritable tr\u00e9sor d'informations librement partag\u00e9es<\/strong> avec le monde entier \u00e0 travers leCentre de donn\u00e9es en ligne Copernicus<\/a>.<\/p>

Explorons en d\u00e9tail les principes de fonctionnement de cette constellation.<\/p>

Orbite<\/strong><\/p>

La position orbitale de chaque satellite Sentinel est d\u00e9termin\u00e9e par sa mission sp\u00e9cifique.<\/strong>. Sentinel-1 et Sentinel-2 orbitent en tandem, assurant une couverture compl\u00e8te de la Terre tous les 6 jours. Sentinel-3 est sur une orbite altim\u00e9trique inclin\u00e9e, offrant une vue compl\u00e8te de la plan\u00e8te tous les 27 jours. Sentinel-4 et Sentinel-5 sont positionn\u00e9s en orbite g\u00e9ostationnaire, permettant une surveillance continue de l'atmosph\u00e8re. Sentinel-6 orbite en tandem avec Jason-3, un satellite d'altim\u00e9trie, pour am\u00e9liorer la pr\u00e9cision des mesures du niveau de la mer.<\/p>

Acquisition de donn\u00e9es<\/strong><\/p>

Les capteurs embarqu\u00e9s de chaque satellite Sentinel sont con\u00e7us pour acqu\u00e9rir des donn\u00e9es sp\u00e9cifiques<\/strong>. Sentinel-1 utilise un radar \u00e0 synth\u00e8se d'ouverture<\/strong> (SAR) pour cartographier la surface de la Terre dans toutes les conditions m\u00e9t\u00e9orologiques. Sentinel-2 est \u00e9quip\u00e9 d'un capteur optique multispectral<\/strong> qui acquiert des images haute r\u00e9solution du terrain et de la v\u00e9g\u00e9tation. Sentinel-3 combine optique, radar et altim\u00e9trie pour mesurer les param\u00e8tres oc\u00e9aniques et atmosph\u00e9riques. Utilisation de Sentinel-4 et Sentinel-5 spectrom\u00e8tres<\/strong> pour surveiller la composition de l'atmosph\u00e8re. Sentinel-6 emploie un altim\u00e8tre radar<\/strong> pour mesurer avec pr\u00e9cision le niveau de la mer.<\/p>

Transmission de donn\u00e9es<\/strong><\/p>

Les donn\u00e9es acquises par les capteurs sont transmises aux stations terrestres Copernicus via Connexions en bande X<\/strong>. Le r\u00e9seau de sstations terrestres<\/strong> est distribu\u00e9 dans le monde entier<\/strong> pour assurer une acquisition efficace des donn\u00e9es.<\/p>

Processus et stockage<\/strong><\/p>

Les donn\u00e9es brutes sont soumises \u00e0 une traitement qui comprend les corrections radiom\u00e9triques, l'\u00e9talonnage et le g\u00e9or\u00e9f\u00e9rencement<\/strong>. Les produits finaux, tels que les images, les cartes et les graphiques, sont stock\u00e9s dans une base de donn\u00e9es accessible.<\/p>

Acc\u00e8s aux donn\u00e9es<\/strong><\/p>

Les donn\u00e9es Copernicus sont librement accessible \u00e0 tous les utilisateurs via le hub de donn\u00e9es en ligne<\/strong>. Le hub de donn\u00e9es offre une interface conviviale pour la recherche, la visualisation et le t\u00e9l\u00e9chargement de donn\u00e9es.<\/p>

En conclusion, les satellites Sentinel repr\u00e9sentent un syst\u00e8me d\u2019observation de la Terre de classe mondiale. Leur technologie de pointe<\/strong>, combin\u00e9 avec le\u00ab acc\u00e8s libre et ouvert aux donn\u00e9es \u00bb<\/strong>, nous permet de surveiller notre plan\u00e8te avec une pr\u00e9cision sans pr\u00e9c\u00e9dent<\/strong>. Les donn\u00e9es Sentinel sont utilis\u00e9es pour une vari\u00e9t\u00e9 d\u2019applications, deagriculture de pr\u00e9cision<\/strong> au surveillance du changement climatique<\/strong>, de la s\u00e9curit\u00e9 \u00e0 la d\u00e9fense. Gr\u00e2ce \u00e0 cette constellation de sentinelles spatiales, nous pouvons mieux comprendre la Terre et construire un avenir plus durable pour notre plan\u00e8te<\/strong>.<\/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":"

La constellation Sentinel joue un r\u00f4le crucial dans le programme Copernicus, fournissant les donn\u00e9es et informations n\u00e9cessaires \u00e0 l'observation de la Terre sous diff\u00e9rents angles. Chaque satellite de la constellation est optimis\u00e9 pour une mission d'observation sp\u00e9cifique et collecte des donn\u00e9es sur divers aspects environnementaux tels que l'atmosph\u00e8re, l'eau, les sols et la v\u00e9g\u00e9tation. Les donn\u00e9es recueillies par les satellites Sentinel sont utilis\u00e9es dans divers secteurs, tels que l'agriculture, la surveillance environnementale, la gestion des catastrophes naturelles et la gestion des ressources en eau, pour n'en citer que quelques-uns.<\/p>","protected":false},"author":18,"featured_media":9295,"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":[83,60],"tags":[74,64,62,73,63,65,79],"class_list":["post-9292","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-agricoltura-di-precisione","category-immagini-satellitari","tag-acqua","tag-agricoltura-4-0","tag-agricoltura-di-precisione","tag-irrigazione","tag-precision-farming","tag-satelliti","tag-tecnologia"],"yoast_head":"\nCostellazione Sentinel: in missione per osservare la Terra - TETHYS<\/title>\n<meta name=\"description\" content=\"La potenza dei satelliti Sentinel per l'agricoltura di precisione: come i dati satellitari possono ottimizzare la gestione delle colture.\" \/>\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\/lavenir-de-lagriculture-de-precision-a-fieragricola-7\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Costellazione Sentinel: in missione per osservare la Terra - TETHYS\" \/>\n<meta property=\"og:description\" content=\"La potenza dei satelliti Sentinel per l'agricoltura di precisione: come i dati satellitari possono ottimizzare la gestione delle colture.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/tethys.farm\/fr\/lavenir-de-lagriculture-de-precision-a-fieragricola-7\/\" \/>\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=\"2024-02-14T16:14:38+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2024-02-14T16:55:28+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/tethys.farm\/wp-content\/uploads\/2024\/02\/pianeta-terra-visto-dal-satellite-scaled.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"2560\" \/>\n\t<meta property=\"og:image:height\" content=\"1440\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"author\" content=\"Evelina Guerreschi\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"\u00c9crit par\" \/>\n\t<meta name=\"twitter:data1\" content=\"Evelina Guerreschi\" \/>\n\t<meta name=\"twitter:label2\" content=\"Dur\u00e9e de lecture estim\u00e9e\" \/>\n\t<meta name=\"twitter:data2\" content=\"7 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\/\/tethys.farm\/costellazione-sentinel-satelliti-per-osservare-la-terra\/#article\",\"isPartOf\":{\"@id\":\"https:\/\/tethys.farm\/costellazione-sentinel-satelliti-per-osservare-la-terra\/\"},\"author\":{\"name\":\"Evelina Guerreschi\",\"@id\":\"https:\/\/tethys.farm\/#\/schema\/person\/f2b9a75a10d0701f21648df6fe6a96e4\"},\"headline\":\"Costellazione Sentinel: in missione per osservare la Terra\",\"datePublished\":\"2024-02-14T16:14:38+00:00\",\"dateModified\":\"2024-02-14T16:55:28+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\/\/tethys.farm\/costellazione-sentinel-satelliti-per-osservare-la-terra\/\"},\"wordCount\":1087,\"commentCount\":0,\"publisher\":{\"@id\":\"https:\/\/tethys.farm\/#organization\"},\"image\":{\"@id\":\"https:\/\/tethys.farm\/costellazione-sentinel-satelliti-per-osservare-la-terra\/#primaryimage\"},\"thumbnailUrl\":\"https:\/\/tethys.farm\/wp-content\/uploads\/2024\/02\/pianeta-terra-visto-dal-satellite-scaled.jpg\",\"keywords\":[\"acqua\",\"agricoltura 4.0\",\"agricoltura di precisione\",\"irrigazione\",\"precision farming\",\"satelliti\",\"tecnologia\"],\"articleSection\":[\"Agricoltura di Precisione\",\"Immagini satellitari\"],\"inLanguage\":\"fr-FR\",\"potentialAction\":[{\"@type\":\"CommentAction\",\"name\":\"Comment\",\"target\":[\"https:\/\/tethys.farm\/costellazione-sentinel-satelliti-per-osservare-la-terra\/#respond\"]}]},{\"@type\":\"WebPage\",\"@id\":\"https:\/\/tethys.farm\/costellazione-sentinel-satelliti-per-osservare-la-terra\/\",\"url\":\"https:\/\/tethys.farm\/costellazione-sentinel-satelliti-per-osservare-la-terra\/\",\"name\":\"Costellazione Sentinel: in missione per osservare la Terra - 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