{"id":29571,"date":"2021-12-28T15:58:23","date_gmt":"2021-12-28T20:58:23","guid":{"rendered":"https:\/\/adf-magazine.com\/?p=29571"},"modified":"2021-12-28T15:58:23","modified_gmt":"2021-12-28T20:58:23","slug":"un-satellite-recense-les-elephants-du-haut-de-son-orbite","status":"publish","type":"post","link":"https:\/\/adf-magazine.com\/fr\/2021\/12\/un-satellite-recense-les-elephants-du-haut-de-son-orbite\/","title":{"rendered":"Un satellite recense les \u00e9l\u00e9phants du haut de son orbite"},"content":{"rendered":"<p>BBC NEWS \u00c0 BBC.CO.UK\/NEWS<\/p>\n<p>Au d\u00e9but, les images satellitaires ressemblent \u00e0 des gouttes grises dans une for\u00eat de taches vertes. Mais en regardant de plus pr\u00e8s, il se trouve que ces gouttes sont des \u00e9l\u00e9phants qui se prom\u00e8nent parmi les arbres. Les scientifiques utilisent ces images pour compter les \u00e9l\u00e9phants africains depuis l\u2019espace.<\/p>\n<p>Les images proviennent d\u2019un satellite d\u2019observation terrestre qui orbite \u00e0 une altitude de 600 km. Cette innovation pourrait permettre d\u2019examiner jusqu\u2019\u00e0 5.000 km carr\u00e9s d\u2019habitat d\u2019\u00e9l\u00e9phants en un seul jour sans nuage.<\/p>\n<p>Le travail laborieux consistant \u00e0 compter les \u00e9l\u00e9phants est effectu\u00e9 \u00e0 l\u2019aide d\u2019un algorithme informatique ayant appris \u00e0 identifier les \u00e9l\u00e9phants dans une vari\u00e9t\u00e9 d\u2019arri\u00e8re-plans.<\/p>\n<p>Le Dr Olga Isupova de l\u2019universit\u00e9 anglaise de Bath d\u00e9clare : \u00ab Nous pr\u00e9sentons simplement des exemples \u00e0 l\u2019algorithme et lui disons \u201cceci est un \u00e9l\u00e9phant ; cela n\u2019est pas un \u00e9l\u00e9phant\u201d. Ce faisant, nous pouvons entra\u00eener la machine \u00e0 reconna\u00eetre les petits d\u00e9tails que nous ne pourrions pas distinguer \u00e0 l\u2019\u0153il nu. \u00bb<\/p>\n<p>Les scientifiques ont d\u2019abord examin\u00e9 le parc national des \u00c9l\u00e9phants d\u2019Addo en Afrique du Sud.<\/p>\n<p>\u00ab Il a une forte densit\u00e9 d\u2019\u00e9l\u00e9phants \u00bb, d\u00e9clare le Dr Isla Duporge, scientifique de la conservation \u00e0 l\u2019universit\u00e9 d\u2019Oxford. \u00ab Et il contient des zones de broussailles et de savanes libres. C\u2019est donc un excellent endroit pour tester notre approche. \u00bb<\/p>\n<p>Les conservationnistes devront payer pour avoir acc\u00e8s aux satellites commerciaux et aux images qu\u2019ils capturent. Mais cette approche pourrait fortement am\u00e9liorer la surveillance des populations d\u2019\u00e9l\u00e9phants menac\u00e9es dans les habitats qui chevauchent les fronti\u00e8res internationales, o\u00f9 il peut \u00eatre difficile d\u2019obtenir la permission de conduire un recensement a\u00e9rien. Les scientifiques d\u00e9clarent qu\u2019elle pourrait aussi \u00eatre utilis\u00e9e dans la lutte contre le braconnage.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>BBC NEWS \u00c0 BBC.CO.UK\/NEWS Au d\u00e9but, les images satellitaires ressemblent \u00e0 des gouttes grises dans une for\u00eat de taches vertes. Mais en regardant de plus pr\u00e8s, il se trouve que ces gouttes sont des \u00e9l\u00e9phants qui se prom\u00e8nent parmi les arbres. Les scientifiques utilisent ces images pour compter les \u00e9l\u00e9phants africains depuis l\u2019espace. Les images<\/p>\n","protected":false},"author":1,"featured_media":29124,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"_uf_show_specific_survey":0,"_uf_disable_surveys":false,"footnotes":""},"categories":[50,40],"tags":[],"class_list":{"0":"post-29571","1":"post","2":"type-post","3":"status-publish","4":"format-standard","5":"has-post-thumbnail","7":"category-chemins-de-lespoir","8":"category-rubriques"},"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Un satellite recense les \u00e9l\u00e9phants du haut de son orbite - Africa Defense Forum<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/adf-magazine.com\/fr\/2021\/12\/un-satellite-recense-les-elephants-du-haut-de-son-orbite\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Un satellite recense les \u00e9l\u00e9phants du haut de son orbite - Africa Defense Forum\" \/>\n<meta property=\"og:description\" content=\"BBC NEWS \u00c0 BBC.CO.UK\/NEWS Au d\u00e9but, les images satellitaires ressemblent \u00e0 des gouttes grises dans une for\u00eat de taches vertes. 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