{"id":849,"date":"2026-07-01T18:39:33","date_gmt":"2026-07-01T16:39:33","guid":{"rendered":"https:\/\/sylphagro.fr\/?p=849"},"modified":"2026-09-08T18:59:45","modified_gmt":"2026-09-08T16:59:45","slug":"il-a-neige-a-pau-en-juin","status":"publish","type":"post","link":"https:\/\/sylphagro.fr\/index.php\/2026\/07\/01\/il-a-neige-a-pau-en-juin\/","title":{"rendered":"Il a neig\u00e9 \u00e0 Pau en juin !!!"},"content":{"rendered":"<div class=\"wp-block-pdfemb-pdf-embedder-viewer\"><a href=\"https:\/\/sylphagro.fr\/wp-content\/uploads\/2026\/09\/Sylphagro_MS_Lin.pdf\" class=\"pdfemb-viewer\" style=\"\" data-width=\"max\" data-height=\"max\" data-toolbar=\"bottom\" data-toolbar-fixed=\"off\">Sylphagro_MS_Lin<\/a><\/div>\n\n\n<p class=\"wp-block-paragraph\"><br>On pourrait presque le croire en voyant cette photo. Mais que les climatosceptiques ne se r\u00e9jouissent pas trop vite\u2026 c\u2019\u00e9tait juste pour attirer votre attention \ud83d\ude42<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Je souhaite parler aujourd\u2019hui d\u2019<strong>imagerie multispectrale<\/strong>. Vocabulaire un peu myst\u00e9rieux: on parle d\u2019infrarouge proche, de NDVI, on sait que c\u2019est utile pour \u00e9tudier la v\u00e9g\u00e9tation et son d\u00e9veloppement\u2026<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Voici quelques images pour mieux comprendre.<br>Le diaporama vous montre 3 vues du m\u00eame paysage, au travers de <strong>3 cam\u00e9ras diff\u00e9rentes<\/strong>:<br>image monochrome avec un <strong>filtre NIR<\/strong> (proche infrarouge)<br>image monochrome avec un <strong>filtre Rouge<\/strong><br>image en couleurs avec une <strong>cam\u00e9ra RGB<\/strong> comparable \u00e0 celle de votre smartphone<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Que remarquons-nous?<br><strong>Image NIR<\/strong> : la v\u00e9g\u00e9tation appara\u00eet tr\u00e8s claire car elle r\u00e9fl\u00e9chit fortement cette longueur d\u2019onde, plus que le sol nu visible au premier plan<br><strong>Image Rouge<\/strong>: le rouge est fortement absorb\u00e9 par les chlorophylles des plantes. En comparaison le sol r\u00e9fl\u00e9chit plus cette longueur d\u2019onde<br>Le <strong>graphique <\/strong>en derni\u00e8re diapo vous explique tout!<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>NDVI ? <\/strong>Il est simplement calcul\u00e9 par la diff\u00e9rence entre les valeurs de r\u00e9flectance en NIR et Rouge : <br><strong>NDVI = (NIR-Rouge)\/(NIR+Rouge)<\/strong><br>Pour faire court, plus il y a de biomasse en bonne sant\u00e9, plus la diff\u00e9rence de r\u00e9flectance entre NIR et rouge est \u00e9lev\u00e9e, et plus les valeurs du NDVI s&rsquo;approchent de +1, le maximum.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Simple non?<\/p>\n","protected":false},"excerpt":{"rendered":"<p>On pourrait presque le croire en voyant cette photo. Mais que les climatosceptiques ne se r\u00e9jouissent pas trop vite\u2026 c\u2019\u00e9tait [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":850,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_monsterinsights_skip_tracking":false,"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"categories":[7],"tags":[],"class_list":["post-849","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-documentation"],"_links":{"self":[{"href":"https:\/\/sylphagro.fr\/index.php\/wp-json\/wp\/v2\/posts\/849","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/sylphagro.fr\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/sylphagro.fr\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/sylphagro.fr\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/sylphagro.fr\/index.php\/wp-json\/wp\/v2\/comments?post=849"}],"version-history":[{"count":4,"href":"https:\/\/sylphagro.fr\/index.php\/wp-json\/wp\/v2\/posts\/849\/revisions"}],"predecessor-version":[{"id":858,"href":"https:\/\/sylphagro.fr\/index.php\/wp-json\/wp\/v2\/posts\/849\/revisions\/858"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/sylphagro.fr\/index.php\/wp-json\/wp\/v2\/media\/850"}],"wp:attachment":[{"href":"https:\/\/sylphagro.fr\/index.php\/wp-json\/wp\/v2\/media?parent=849"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/sylphagro.fr\/index.php\/wp-json\/wp\/v2\/categories?post=849"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/sylphagro.fr\/index.php\/wp-json\/wp\/v2\/tags?post=849"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}