{"id":774,"date":"2021-07-15T17:14:19","date_gmt":"2021-07-15T17:14:19","guid":{"rendered":"https:\/\/www.nhtgs.net\/?p=774"},"modified":"2021-07-15T17:15:59","modified_gmt":"2021-07-15T17:15:59","slug":"image-satellitaire","status":"publish","type":"post","link":"https:\/\/www.nhtgs.net\/en\/formations\/image-satellitaire\/","title":{"rendered":"Image satellitaire"},"content":{"rendered":"<figure class=\"wp-block-image size-large\"><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" width=\"531\" height=\"422\" src=\"https:\/\/i0.wp.com\/www.nhtgs.net\/wp-content\/uploads\/2021\/07\/Earth_image_from_space.png?resize=531%2C422&#038;ssl=1\" alt=\"image de la terre\" class=\"wp-image-775\" srcset=\"https:\/\/i0.wp.com\/www.nhtgs.net\/wp-content\/uploads\/2021\/07\/Earth_image_from_space.png?w=531&amp;ssl=1 531w, https:\/\/i0.wp.com\/www.nhtgs.net\/wp-content\/uploads\/2021\/07\/Earth_image_from_space.png?resize=300%2C238&amp;ssl=1 300w, https:\/\/i0.wp.com\/www.nhtgs.net\/wp-content\/uploads\/2021\/07\/Earth_image_from_space.png?resize=100%2C79&amp;ssl=1 100w, https:\/\/i0.wp.com\/www.nhtgs.net\/wp-content\/uploads\/2021\/07\/Earth_image_from_space.png?resize=16%2C12&amp;ssl=1 16w\" sizes=\"auto, (max-width: 531px) 100vw, 531px\" \/><figcaption>image de la terre<\/figcaption><\/figure>\n\n\n\n<p>L\u2019imagerie satellitaire est l\u2019ensemble des images produites par des objets en orbite (appel\u00e9 satellite) autour de notre plan\u00e8te bleue. Les satellites les plus communs sont&nbsp;:<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li>Satellite de la t\u00e9l\u00e9communication&nbsp;: Intelsat<\/li><li>Satellite de la t\u00e9l\u00e9d\u00e9tection&nbsp;: Landsat<\/li><li>Satellite de la du positionnement&nbsp;: <a href=\"https:\/\/www.nhtgs.net\/en\/formations\/gps\/\">GPS<\/a>, GLONASS<\/li><li>Satellite scientifique&nbsp;: Spoutnik 1, Appolo<\/li><\/ul>\n\n\n\n<p>Les images r\u00e9guli\u00e8res proviennent des satellites de t\u00e9l\u00e9d\u00e9tection. Parmi ces derni\u00e8res nous avons Landsat, Sentinel, SPOT, QuickBird, GeoEye.<\/p>\n\n\n\n<p>Ces satellites sont caract\u00e9ris\u00e9s par quatre types de r\u00e9solution, dont la r\u00e9solution temporaire, spectral, radiom\u00e9trique et spatiale. Les images r\u00e9sultantes sont directement influenc\u00e9es par la r\u00e9solution spectrale (les zones du spectre \u00e9lectromagn\u00e9tique faiblement perturber par l\u2019atmosph\u00e8re) et spectrale (la taille des pixels que constituent les images).<\/p>\n\n\n\n<p>Selon le probl\u00e8me que l\u2019on souhaite r\u00e9soudre avec les images satellitaires, le choix est fait entre ces satellite en fonction de leur caract\u00e9ristique. Pour une \u00e9tude des vastes \u00e9tendues comme la d\u00e9forestation et la construction d\u2019un grand barrage hydro\u00e9lectrique, Landsat est id\u00e9ale dans ce cas avec des r\u00e9solution spatiale de 30 \u00e0 15m. Mais lorsqu\u2019on souhaite avoir des d\u00e9tails au sol comme les voitures dans un park ou les pirogues sur un fleuve, il faut des images de haute r\u00e9solution de QuickBird (60 cm), GeoEye (40cm), KOMPSAT (40 cm).<\/p>\n\n\n\n<p>Les images de haute r\u00e9solution sont souvent payantes, pouvant co\u00fbter jusqu\u2019\u00e0 600$ pour une surface de 50 km\u00b2. Rendez-vous \u00e0 <a href=\"https:\/\/eos.com\/landviewer\">Landviewer<\/a> pour plus de d\u00e9tails.<\/p>\n\n\n\n<p>Pour les images de faible r\u00e9solution sont parfois gratuite comme celle de Landsat 5, 7 et 8 ou Sentinel 1 et 2. Allez-y sur &nbsp;<a href=\"https:\/\/earthexplorer.usgs.gov\/\">EarthExplorer<\/a> pour plus de d\u00e9tails. <\/p>\n\n\n\n<p>Nimba High Tech Geo Services donne une bonne formation de t\u00e9l\u00e9d\u00e9tection sur ENVI, Global&nbsp;Mapper, Erdas Imagine et ArcGIS. Vous pouvez <a href=\"https:\/\/www.nhtgs.net\/en\/contacts\/\">nous contacter<\/a> si vous en avez besoin.<\/p>","protected":false},"excerpt":{"rendered":"<div class=\"slide-text-bg2\"><span>L\u2019imagerie satellitaire est l\u2019ensemble des images produites par des objets en orbite (appel\u00e9 satellite) autour de notre plan\u00e8te bleue. Les satellites<\/span><\/div>\n<div class=\"slide-btn-area-sm\"><a href=\"https:\/\/www.nhtgs.net\/en\/formations\/image-satellitaire\/\" class=\"slide-btn-sm\">Read More<\/a><\/div>","protected":false},"author":10,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"advanced_seo_description":"","jetpack_seo_html_title":"","jetpack_seo_noindex":false,"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_post_was_ever_published":false},"categories":[6],"tags":[],"class_list":["post-774","post","type-post","status-publish","format-standard","hentry","category-formations"],"jetpack_featured_media_url":"","jetpack-related-posts":[],"jetpack_sharing_enabled":true,"jetpack_likes_enabled":true,"_links":{"self":[{"href":"https:\/\/www.nhtgs.net\/en\/wp-json\/wp\/v2\/posts\/774","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.nhtgs.net\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.nhtgs.net\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.nhtgs.net\/en\/wp-json\/wp\/v2\/users\/10"}],"replies":[{"embeddable":true,"href":"https:\/\/www.nhtgs.net\/en\/wp-json\/wp\/v2\/comments?post=774"}],"version-history":[{"count":2,"href":"https:\/\/www.nhtgs.net\/en\/wp-json\/wp\/v2\/posts\/774\/revisions"}],"predecessor-version":[{"id":777,"href":"https:\/\/www.nhtgs.net\/en\/wp-json\/wp\/v2\/posts\/774\/revisions\/777"}],"wp:attachment":[{"href":"https:\/\/www.nhtgs.net\/en\/wp-json\/wp\/v2\/media?parent=774"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.nhtgs.net\/en\/wp-json\/wp\/v2\/categories?post=774"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.nhtgs.net\/en\/wp-json\/wp\/v2\/tags?post=774"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}