{"id":5495,"date":"2022-10-04T15:11:17","date_gmt":"2022-10-05T01:11:17","guid":{"rendered":"https:\/\/recherche.upf.pf\/?post_type=projet&#038;p=5495"},"modified":"2024-09-21T18:19:39","modified_gmt":"2024-09-22T04:19:39","slug":"teledetection-de-la-vegetation-des-iles-hautes-polynesiennes","status":"publish","type":"projet","link":"https:\/\/recherche.upf.pf\/ty\/projet\/teledetection-de-la-vegetation-des-iles-hautes-polynesiennes\/","title":{"rendered":"T\u00e9l\u00e9d\u00e9tection de la V\u00e9g\u00e9tation des Iles Hautes Polyn\u00e9siennes"},"content":{"rendered":"<p class=\"qtranxs-available-languages-message qtranxs-available-languages-message-ty\">D\u00e9sol\u00e9, ce contenu est uniquement disponible en <a href=\"https:\/\/recherche.upf.pf\/fr\/wp-json\/wp\/v2\/projet\/5495\" class=\"qtranxs-available-language-link qtranxs-available-language-link-fr\" title=\"Fran\u00e7ais\">Fran\u00e7ais<\/a>.<\/p><p>A mon arriv\u00e9e \u00e0 l&#8217;UPF en 2001, j&#8217;oriente mes recherches sur la t\u00e9l\u00e9d\u00e9tection environnementale, et plus particuli\u00e8rement sur la v\u00e9g\u00e9tation des \u00eeles polyn\u00e9siennes.<\/p>\n\n\n\n<div class=\"wp-block-cover is-light\"><span aria-hidden=\"true\" class=\"wp-block-cover__background has-background-dim-10 has-background-dim\"><\/span><img loading=\"lazy\" decoding=\"async\" width=\"600\" height=\"450\" data-attachment-id=\"5498\" data-permalink=\"https:\/\/recherche.upf.pf\/ty\/projet\/teledetection-de-la-vegetation-des-iles-hautes-polynesiennes\/attachment\/marau\/\" data-orig-file=\"https:\/\/recherche.upf.pf\/wp-content\/uploads\/2022\/10\/marau.jpg\" data-orig-size=\"600,450\" data-comments-opened=\"1\" data-image-meta=\"{&quot;aperture&quot;:&quot;0&quot;,&quot;credit&quot;:&quot;&quot;,&quot;camera&quot;:&quot;&quot;,&quot;caption&quot;:&quot;&quot;,&quot;created_timestamp&quot;:&quot;0&quot;,&quot;copyright&quot;:&quot;&quot;,&quot;focal_length&quot;:&quot;0&quot;,&quot;iso&quot;:&quot;0&quot;,&quot;shutter_speed&quot;:&quot;0&quot;,&quot;title&quot;:&quot;&quot;,&quot;orientation&quot;:&quot;0&quot;}\" data-image-title=\"Montagne Tahiti\" data-image-description=\"\" data-image-caption=\"\" data-medium-file=\"https:\/\/recherche.upf.pf\/wp-content\/uploads\/2022\/10\/marau-300x300.jpg\" data-large-file=\"https:\/\/recherche.upf.pf\/wp-content\/uploads\/2022\/10\/marau.jpg\" class=\"wp-block-cover__image-background wp-image-5498\" alt=\"\" src=\"https:\/\/recherche.upf.pf\/wp-content\/uploads\/2022\/10\/marau.jpg\" style=\"object-position:51% 50%\" data-object-fit=\"cover\" data-object-position=\"51% 50%\" srcset=\"https:\/\/recherche.upf.pf\/wp-content\/uploads\/2022\/10\/marau.jpg 600w, https:\/\/recherche.upf.pf\/wp-content\/uploads\/2022\/10\/marau-300x225.jpg 300w, https:\/\/recherche.upf.pf\/wp-content\/uploads\/2022\/10\/marau-60x45.jpg 60w\" sizes=\"auto, (max-width: 600px) 100vw, 600px\" \/><div class=\"wp-block-cover__inner-container is-layout-flow wp-block-cover-is-layout-flow\">\n<h2 class=\"has-text-color wp-block-heading\" style=\"color:#ffe074;font-size:64px\"> <strong>Les \u00eeles hautes polyn\u00e9siennes&#8230;<\/strong><\/h2>\n\n\n\n<p>&#8230; sont recouvertes d&#8217;une v\u00e9g\u00e9tation fortement h\u00e9t\u00e9rog\u00e8ne et complexe<\/p>\n<\/div><\/div>\n\n\n\n<p>Mon objectif principal est la<strong> cartographie du milieu naturel terrestre des \u00eeles hautes<\/strong>. <\/p>\n\n\n\n<p>Or, l\u2019\u00e9laboration de cette cartographie s\u2019av\u00e8re d\u00e9licate du fait de la complexit\u00e9 et l\u2019h\u00e9t\u00e9rog\u00e9n\u00e9it\u00e9 de la distribution spatiale de la v\u00e9g\u00e9tation, caus\u00e9es par les contraintes fortes li\u00e9es \u00e0 la topographie abrupte, la taille r\u00e9duite des \u00eeles et les vents dominants qui sont \u00e0 l&#8217;origine d&#8217;un <strong>effet de foehn<\/strong> tr\u00e8s marqu\u00e9, mais aussi l\u2019activit\u00e9 anthropique et les introductions d&#8217;esp\u00e8ces envahissantes.<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"650\" height=\"280\" data-attachment-id=\"5519\" data-permalink=\"https:\/\/recherche.upf.pf\/ty\/projet\/teledetection-de-la-vegetation-des-iles-hautes-polynesiennes\/attachment\/foehn\/\" data-orig-file=\"https:\/\/recherche.upf.pf\/wp-content\/uploads\/2022\/10\/foehn.png\" data-orig-size=\"650,280\" data-comments-opened=\"1\" data-image-meta=\"{&quot;aperture&quot;:&quot;0&quot;,&quot;credit&quot;:&quot;&quot;,&quot;camera&quot;:&quot;&quot;,&quot;caption&quot;:&quot;&quot;,&quot;created_timestamp&quot;:&quot;0&quot;,&quot;copyright&quot;:&quot;&quot;,&quot;focal_length&quot;:&quot;0&quot;,&quot;iso&quot;:&quot;0&quot;,&quot;shutter_speed&quot;:&quot;0&quot;,&quot;title&quot;:&quot;&quot;,&quot;orientation&quot;:&quot;0&quot;}\" data-image-title=\"foehn\" data-image-description=\"\" data-image-caption=\"\" data-medium-file=\"https:\/\/recherche.upf.pf\/wp-content\/uploads\/2022\/10\/foehn-300x280.png\" data-large-file=\"https:\/\/recherche.upf.pf\/wp-content\/uploads\/2022\/10\/foehn.png\" src=\"https:\/\/recherche.upf.pf\/wp-content\/uploads\/2022\/10\/foehn.png\" alt=\"\" class=\"wp-image-5519\" srcset=\"https:\/\/recherche.upf.pf\/wp-content\/uploads\/2022\/10\/foehn.png 650w, https:\/\/recherche.upf.pf\/wp-content\/uploads\/2022\/10\/foehn-300x129.png 300w, https:\/\/recherche.upf.pf\/wp-content\/uploads\/2022\/10\/foehn-60x26.png 60w, https:\/\/recherche.upf.pf\/wp-content\/uploads\/2022\/10\/foehn-600x258.png 600w\" sizes=\"auto, (max-width: 650px) 100vw, 650px\" \/><figcaption>Illustration de l&#8217;effet de Foehn sur Tahiti<br><em>Papy,1951-1954 in Mueller-Dombois et Fosberg, 1998<\/em><\/figcaption><\/figure>\n<\/div>\n\n\n<p>La cartographie la plus aboutie a \u00e9t\u00e9 obtenue en int\u00e9grant conjointement un maximum d\u2019informations compl\u00e9mentaires:<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li> informations <strong>spectrales <\/strong>et <strong>texturales <\/strong>\u00e0 partir de la donn\u00e9e optique, <\/li><li>informations <strong>structurelles <\/strong>et <strong>polarim\u00e9triques <\/strong>\u00e0 partir de la donn\u00e9e radar, <\/li><li>informations<strong> g\u00e9o-morphologiques<\/strong> issues du Mod\u00e8le Num\u00e9rique d\u2019\u00e9l\u00e9vation et des cartes m\u00e9t\u00e9orologiques. Ces derni\u00e8res apportent une information compl\u00e9mentaire sur la distribution spatiale des esp\u00e8ces.<\/li><\/ul>\n\n\n\n<p>Dans ce contexte de cartographie tr\u00e8s ardu, l\u2019utilisation de l\u2019<strong>algorithme SVM<\/strong> (S\u00e9parateur \u00e0 vaste marge ou support vector machine) s\u2019est r\u00e9v\u00e9l\u00e9e particuli\u00e8rement appropri\u00e9e du fait de ses  propri\u00e9t\u00e9s intrins\u00e8ques que sont : <\/p>\n\n\n\n<ul class=\"wp-block-list\"><li>sa <strong>nature non-descriptive<\/strong>, <\/li><li>sa capacit\u00e9 de discrimination bas\u00e9e sur un <strong>faible nombre de pixels d\u2019apprentissage<\/strong>, <\/li><li>sa capacit\u00e9 \u00e0 <strong>traiter un grand nombre de donn\u00e9es h\u00e9t\u00e9rog\u00e8nes<\/strong>, <\/li><li>\u2026.<\/li><\/ul>\n\n\n\n<p>Ce faisant, des probl\u00e9matiques environnementales importantes ont \u00e9t\u00e9 abord\u00e9es telles la<strong> cartographie de l\u2019esp\u00e8ce envahissante <em>Miconia calvescens<\/em><\/strong>, la cartographie de l\u2019<strong>habitat d\u2019esp\u00e8ces rares par mod\u00e9lisation de leur niche \u00e9cologique<\/strong>, la cartographie de la <strong>for\u00eat de nuages de Tahiti<\/strong> et sa r\u00e9gression probable li\u00e9e au r\u00e9chauffement plan\u00e9taire, <strong>l\u2019\u00e9tude de la cocoteraie des Tuamotu<\/strong> (ressource naturelle importante pour la Polyn\u00e9sie fran\u00e7aise), etc.<\/p>\n\n\n\n<p>Mais la contribution la plus significative a \u00e9t\u00e9 sans aucun doute la <strong>cartographie du milieu naturel terrestre de Moorea<\/strong> qui a \u00e9t\u00e9 propos\u00e9e dans le cadre du projet international&nbsp;<a href=\"http:\/\/mooreabiocode.org\/\" target=\"_blank\" rel=\"noreferrer noopener\">Moorea Biocode<\/a>.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"900\" height=\"541\" data-attachment-id=\"5520\" data-permalink=\"https:\/\/recherche.upf.pf\/ty\/projet\/teledetection-de-la-vegetation-des-iles-hautes-polynesiennes\/attachment\/moorea_biocode\/\" data-orig-file=\"https:\/\/recherche.upf.pf\/wp-content\/uploads\/2022\/10\/moorea_biocode.png\" data-orig-size=\"1140,685\" data-comments-opened=\"1\" data-image-meta=\"{&quot;aperture&quot;:&quot;0&quot;,&quot;credit&quot;:&quot;&quot;,&quot;camera&quot;:&quot;&quot;,&quot;caption&quot;:&quot;&quot;,&quot;created_timestamp&quot;:&quot;0&quot;,&quot;copyright&quot;:&quot;&quot;,&quot;focal_length&quot;:&quot;0&quot;,&quot;iso&quot;:&quot;0&quot;,&quot;shutter_speed&quot;:&quot;0&quot;,&quot;title&quot;:&quot;&quot;,&quot;orientation&quot;:&quot;0&quot;}\" data-image-title=\"moorea_biocode\" data-image-description=\"\" data-image-caption=\"\" data-medium-file=\"https:\/\/recherche.upf.pf\/wp-content\/uploads\/2022\/10\/moorea_biocode-300x300.png\" data-large-file=\"https:\/\/recherche.upf.pf\/wp-content\/uploads\/2022\/10\/moorea_biocode-900x541.png\" src=\"https:\/\/recherche.upf.pf\/wp-content\/uploads\/2022\/10\/moorea_biocode-900x541.png\" alt=\"\" class=\"wp-image-5520\" srcset=\"https:\/\/recherche.upf.pf\/wp-content\/uploads\/2022\/10\/moorea_biocode-900x541.png 900w, https:\/\/recherche.upf.pf\/wp-content\/uploads\/2022\/10\/moorea_biocode-300x180.png 300w, https:\/\/recherche.upf.pf\/wp-content\/uploads\/2022\/10\/moorea_biocode-60x36.png 60w, https:\/\/recherche.upf.pf\/wp-content\/uploads\/2022\/10\/moorea_biocode-600x361.png 600w, https:\/\/recherche.upf.pf\/wp-content\/uploads\/2022\/10\/moorea_biocode.png 1140w\" sizes=\"auto, (max-width: 900px) 100vw, 900px\" \/><figcaption>Cartographie du milieu naturel terrestre de Moorea<\/figcaption><\/figure>\n\n\n\n<p>Des r\u00e9sultats plus fondamentaux ont aussi \u00e9t\u00e9 obtenus comme la <strong>validation de l\u2019algorithme SVM<\/strong> pour classifier de la donn\u00e9e radar, mais aussi pour des cas complexes (grand nombre de bandes, donn\u00e9es h\u00e9t\u00e9rog\u00e8nes, donn\u00e9es \u00e0 tr\u00e8s hautes r\u00e9solutions), l\u2019\u00e9tude comparative d\u2019<strong>indices polarim\u00e9triques radar<\/strong> pour discriminer la v\u00e9g\u00e9tation polyn\u00e9sienne, une <strong>m\u00e9thode de sous-\u00e9chantillonnage <\/strong>pour pallier le faible nombre de zones d\u2019apprentissage homog\u00e8nes, la validation de la m\u00e9thode d\u2019<strong>\u00e9chantillonnage terrain sur les \u00e9cotones<\/strong> pour les algorithmes de classification et en particulier pour l\u2019algorithme SVM, l\u2019utilisation de l\u2019algorithme de ligne de partage des eaux pour <strong>segmenter les couronnes de cocotiers <\/strong>sur les images optiques tr\u00e8s haute r\u00e9solution, l\u2019int\u00e9r\u00eat de la <strong>m\u00e9thode de fusion SVM sur la v\u00e9g\u00e9tation tropicale<\/strong>, une optimisation d\u2019un sch\u00e9ma de fusion SVM connu, etc.<\/p>\n\n\n\n<p>Ce projet s&#8217;est conclu avec la pr\u00e9sentation de mon <strong>Habilitation \u00e0 Diriger des Recherches en 2014<\/strong>, qui fait le point sur toutes ces probl\u00e9matiques.<\/p>\n\n\n\n<p>Parmi les conclusions de cette habilitation, j&#8217;ai not\u00e9 que pour am\u00e9liorer la pr\u00e9cision des cartographies, il fallait:<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li>utiliser de la donn\u00e9e plus pr\u00e9cise (tant spatialement que spectralement)<\/li><li>acc\u00e9der aux sous-bois pour pallier l&#8217;inconv\u00e9nient de la t\u00e9l\u00e9d\u00e9tection classique qui n&#8217;acc\u00e8de qu&#8217;\u00e0 la canop\u00e9e.<\/li><li>rajouter de l&#8217;information sur le contexte (donn\u00e9es vectorielles). <\/li><\/ul>\n\n\n\n<p>Tous ces points ont \u00e9t\u00e9 abord\u00e9s depuis, dans mes \u00e9tudes sur l&#8217;atoll de Tetiaroa.<\/p>","protected":false},"author":75,"featured_media":5507,"template":"","coauthors":[422],"class_list":["post-5495","projet","type-projet","status-publish","has-post-thumbnail","hentry","entry"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.3 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>T\u00e9l\u00e9d\u00e9tection de la V\u00e9g\u00e9tation des Iles Hautes Polyn\u00e9siennes &#8226; Recherche UPF<\/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:\/\/recherche.upf.pf\/ty\/projet\/teledetection-de-la-vegetation-des-iles-hautes-polynesiennes\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"T\u00e9l\u00e9d\u00e9tection de la V\u00e9g\u00e9tation des Iles Hautes Polyn\u00e9siennes &#8226; Recherche UPF\" 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A mon arriv\u00e9e \u00e0 l&#8217;UPF en 2001, j&#8217;oriente mes recherches sur la t\u00e9l\u00e9d\u00e9tection environnementale, et plus particuli\u00e8rement sur la v\u00e9g\u00e9tation des \u00eeles polyn\u00e9siennes. Mon objectif principal est la cartographie du milieu naturel terrestre des \u00eeles hautes. Or, l\u2019\u00e9laboration de cette cartographie s\u2019av\u00e8re d\u00e9licate du fait de la&hellip; Continue reading T\u00e9l\u00e9d\u00e9tection de la V\u00e9g\u00e9tation des Iles Hautes Polyn\u00e9siennes\" \/>\n<meta property=\"og:url\" content=\"https:\/\/recherche.upf.pf\/projet\/teledetection-de-la-vegetation-des-iles-hautes-polynesiennes\/\" \/>\n<meta property=\"og:site_name\" content=\"Recherche UPF\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/univpf\" \/>\n<meta property=\"article:modified_time\" content=\"2024-09-22T04:19:39+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/recherche.upf.pf\/wp-content\/uploads\/2022\/10\/Tubuai.png\" \/>\n\t<meta property=\"og:image:width\" content=\"960\" \/>\n\t<meta property=\"og:image:height\" content=\"475\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/png\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:site\" content=\"@univpf\" \/>\n<meta name=\"twitter:label1\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data1\" content=\"3 minutes\" \/>\n\t<meta name=\"twitter:label2\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data2\" content=\"Benoit Stoll\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/recherche.upf.pf\\\/projet\\\/teledetection-de-la-vegetation-des-iles-hautes-polynesiennes\\\/\",\"url\":\"https:\\\/\\\/recherche.upf.pf\\\/projet\\\/teledetection-de-la-vegetation-des-iles-hautes-polynesiennes\\\/\",\"name\":\"T\u00e9l\u00e9d\u00e9tection de la V\u00e9g\u00e9tation des Iles Hautes Polyn\u00e9siennes &#8226; 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A mon arriv\u00e9e \u00e0 l&#8217;UPF en 2001, j&#8217;oriente mes recherches sur la t\u00e9l\u00e9d\u00e9tection environnementale, et plus particuli\u00e8rement sur la v\u00e9g\u00e9tation des \u00eeles polyn\u00e9siennes. Mon objectif principal est la cartographie du milieu naturel terrestre des \u00eeles hautes. 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