{"id":2274,"date":"2017-09-06T11:44:13","date_gmt":"2017-09-06T10:44:13","guid":{"rendered":"http:\/\/geowww.agrocampus-ouest.fr\/web\/?p=2274"},"modified":"2022-01-18T14:52:04","modified_gmt":"2022-01-18T13:52:04","slug":"visualiseur-temporel-et-teledetection","status":"publish","type":"post","link":"https:\/\/geosas.fr\/web\/?p=2274","title":{"rendered":"La t\u00e9l\u00e9d\u00e9tection d\u00e9barque sur G\u00e9oSAS !"},"content":{"rendered":"<p style=\"text-align: justify;\">A l&rsquo;occasion d&rsquo;un programme financ\u00e9 par la pr\u00e9fecture de R\u00e9gion Bretagne, le laboratoire Physique et Spatialisation Num\u00e9rique (PSN) d&rsquo;Agrocampus Ouest et l&rsquo;UMR SAS ont d\u00e9ploy\u00e9s un service web permettant de visualiser et t\u00e9l\u00e9charger des produits issus de la t\u00e9l\u00e9d\u00e9tection. Ce service dispose d&rsquo;une dimension temporelle afin d&rsquo;effectuer des suivis, mais aussi pour avoir une information au plus proche de la r\u00e9alit\u00e9 en permanence.<\/p>\n<p style=\"text-align: justify;\">Sous la coordination du professeur Herv\u00e9 Nicolas, Mounir Saadni et Donatien Dallery, deux ing\u00e9nieurs contractuels, ont mis au point une cha\u00eene de traitement afin d&rsquo;automatiser le t\u00e9l\u00e9chargement de donn\u00e9es MODIS, la production d&rsquo;indices et la publication de ceux-ci sur un GeoServer. Ces donn\u00e9es sont formalis\u00e9es selon les standards OGC\/INSPIRE facilitant leur r\u00e9emploi dans un service web.<\/p>\n<p style=\"text-align: justify;\">Selon les dates, des nuages sont pr\u00e9sents sur les images satellites. \u00c9tant donn\u00e9 que la t\u00e9l\u00e9d\u00e9tection est un domaine qui tend \u00e0 se d\u00e9velopper en dehors de la recherche, nous avons d\u00e9cid\u00e9 de diffuser une information accessible par tous. Pour cette raison, nous avons d\u00e9cid\u00e9 de supprimer ces zones dont les valeurs ne sont pas exploitables et pouvant pr\u00eater \u00e0 confusion afin d&rsquo;\u00e9viter une mauvaise compr\u00e9hension de ces nouveaux produits.<\/p>\n<p>Actuellement, 4 produits sont disponibles (ctrl + molette pour interagir avec la frise chronologique du viewer):<\/p>\n<ul>\n<li style=\"list-style-type: none;\">\n<ul>\n<li style=\"text-align: justify;\"><strong>Le Normalized Difference Vegetation Index (NDVI) : <\/strong>Le NDVI est un indice de v\u00e9g\u00e9tation mettant en valeur le dynamisme de la v\u00e9g\u00e9tation, par sa teneur en chlorophylle et la structure du couvert v\u00e9g\u00e9tal. Cet indice est calcul\u00e9 \u00e0 partir du rayonnement solaire r\u00e9fl\u00e9chi dans le rouge et le proche infrarouge. Cet indice est normalis\u00e9 entre -1 (surface autre que v\u00e9g\u00e9tation) et 1 (surface avec une v\u00e9g\u00e9tation tr\u00e8s dynamique) avec du sol nu pour des valeurs proches de 0. L&rsquo;aspect temporelle de cet indice permet de suivre la ph\u00e9nologie de la v\u00e9g\u00e9tation. De cette mani\u00e8re, il est possible de d\u00e9terminer l&rsquo;usage des sols.<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p><iframe loading=\"lazy\" style=\"border: 0pt none;\" src=\"https:\/\/geosas.fr\/sviewer\/?wmc=https:\/\/geosas.fr\/wmc\/geouest\/bzh_ndvi.wmc\" width=\"100%\" height=\"500\" frameborder=\"0\" scrolling=\"auto\"><\/iframe><br \/>\n<a href=\"https:\/\/geosas.fr\/portails\/?portail=geouest&amp;mode=viewer&amp;viewer=https:\/\/geosas.fr\/sviewer&amp;wmc=https:\/\/geosas.fr\/wmc\/geouest\/bzh_ndvi.wmc\">Plein \u00e9cran<\/a> &#8211; <a href=\"https:\/\/geosas.fr\/geonetwork\/srv\/fre\/catalog.search#\/metadata\/5ef858b4-f7c7-4fa5-a646-4c5cf06048de\">M\u00e9tadonn\u00e9es<\/a><\/p>\n<ul>\n<li style=\"list-style-type: none;\">\n<ul>\n<li style=\"text-align: justify;\"><strong>L&rsquo;Evaporative Fraction (EF) : <\/strong>L&rsquo;Evaporative Fraction s\u2019appuie sur les produits pr\u00e9c\u00e9dents et combine le rayonnement r\u00e9fl\u00e9chi et la temp\u00e9rature de la surface. Elle met en valeur la capacit\u00e9 de la surface \u00e0 \u00e9vaporer, qu\u2019elle soit compos\u00e9e de v\u00e9g\u00e9tation ou non. Elle repr\u00e9sente un indicateur pour, par exemple, identifier des situations de stress hydrique. Elle est aussi une donn\u00e9e servant \u00e0 alimenter des mod\u00e8les qui permettront l\u2019estimation de l&rsquo;\u00e9vapotranspiration r\u00e9elle des surfaces continentales. Cet indice est normalis\u00e9 entre 0 (surface non \u00e9vaporante) et 1.26 (surface tr\u00e8s \u00e9vaporante).<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p><iframe loading=\"lazy\" style=\"border: 0pt none;\" src=\"https:\/\/geosas.fr\/sviewer\/?wmc=https:\/\/geosas.fr\/wmc\/geouest\/bzh_ef.wmc\" width=\"100%\" height=\"500\" frameborder=\"0\" scrolling=\"auto\"><\/iframe><br \/>\n<a href=\"https:\/\/geosas.fr\/portails\/?portail=geouest&amp;mode=viewer&amp;viewer=https:\/\/geosas.fr\/sviewer&amp;wmc=https:\/\/geosas.fr\/wmc\/geouest\/bzh_ef.wmc\">Plein \u00e9cran<\/a> &#8211; <a href=\"http:\/\/geowww.agrocampus-ouest.fr\/geonetwork\/apps\/georchestra\/?uuid=c48baaf4-1da0-481e-a6cc-99abfc863a22\">M\u00e9tadonn\u00e9es<\/a><\/p>\n<ul>\n<li style=\"list-style-type: none;\">\n<ul>\n<li style=\"text-align: justify;\"><strong>La temp\u00e9rature de jour : <\/strong>La temp\u00e9rature de jour est issue du produit MODIS MOD11A2. Cette donn\u00e9e est la mesure moyenne de la temp\u00e9rature (\u00e0 partir du rayonnement dans le moyen infrarouge thermique) sur 8 jours et par temps clair. Il a \u00e9t\u00e9 d\u00e9cid\u00e9 de diffuser cette information afin de la rendre accessible et qu&rsquo;il est possible de mettre en \u00e9vidence des lieux o\u00f9 l&rsquo;amplitude thermique est plus faible ou forte tel\u00a0milieux humides\/aquatiques ou les villes.<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p><iframe loading=\"lazy\" style=\"border: 0pt none;\" src=\"https:\/\/geosas.fr\/sviewer\/?wmc=https:\/\/geosas.fr\/wmc\/geouest\/bzh_temperature_jour.wmc\" width=\"100%\" height=\"500\" frameborder=\"0\" scrolling=\"auto\"><\/iframe><br \/>\n<a href=\"https:\/\/geosas.fr\/portails\/?portail=geouest&amp;mode=viewer&amp;viewer=https:\/\/geosas.fr\/sviewer&amp;wmc=https:\/\/geosas.fr\/wmc\/geouest\/bzh_temperature_jour.wmc\">Plein \u00e9cran<\/a> &#8211; <a href=\"http:\/\/geowww.agrocampus-ouest.fr\/geonetwork\/apps\/georchestra\/?uuid=07ac3e4f-fbf1-4be2-ab67-43899c529313\">M\u00e9tadonn\u00e9es<\/a><\/p>\n<ul>\n<li style=\"list-style-type: none;\">\n<ul>\n<li style=\"text-align: justify;\"><strong>La temp\u00e9rature de nuit :\u00a0<\/strong>La temp\u00e9rature de nuit est issue du produit MODIS MOD11A2. Cette donn\u00e9e est la mesure moyenne de la temp\u00e9rature (\u00e0 partir du rayonnement dans le moyen infrarouge thermique) sur 8 jours et par temps clair. Il a \u00e9t\u00e9 d\u00e9cid\u00e9 de diffuser cette information afin de la rendre accessible et qu&rsquo;il est possible de mettre en \u00e9vidence des lieux o\u00f9 la temp\u00e9rature est plus \u00e9lev\u00e9e la nuit tel les \u00eelots de chaleur urbains ou les milieux humides\/aquatiques.<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p><iframe loading=\"lazy\" style=\"border: 0pt none;\" src=\"https:\/\/geosas.fr\/sviewer\/?wmc=https:\/\/geosas.fr\/wmc\/geouest\/bzh_temperature_nuit.wmc\" width=\"100%\" height=\"500\" frameborder=\"0\" scrolling=\"auto\"><\/iframe><br \/>\n<a href=\"https:\/\/geosas.fr\/portails\/?portail=geouest&amp;mode=viewer&amp;viewer=https:\/\/geosas.fr\/sviewer&amp;wmc=https:\/\/geosas.fr\/wmc\/geouest\/bzh_temperature_nuit.wmc\">Plein \u00e9cran<\/a> &#8211; <a href=\"http:\/\/geowww.agrocampus-ouest.fr\/geonetwork\/apps\/georchestra\/?uuid=32e6c261-10b5-4607-8c8a-1a05152c58aa\">M\u00e9tadonn\u00e9es<\/a><\/p>\n<p style=\"text-align: justify;\">Pour plus d&rsquo;informations concernant la cha\u00eene de traitement et les indices, un document est t\u00e9l\u00e9chargeable \u00e0 cette <a href=\"https:\/\/geosas.fr\/metadata\/pdf\/teledetection_metadata.pdf\">adresse<\/a>. Un <a href=\"https:\/\/cms.geobretagne.fr\/content\/la-teledetection-satellite-facile\">article<\/a> est \u00e9galement disponible sur le site de G\u00e9oBretagne d\u00e9crivant les principes de la t\u00e9l\u00e9d\u00e9tection, une contextualisation de ce programme et une description des produits.<\/p>\n<p style=\"text-align: justify;\">Ces premiers travaux mettent en \u00e9vidence la possibilit\u00e9 de diffuser des donn\u00e9es de t\u00e9l\u00e9d\u00e9tection avec une dimension temporelle de mani\u00e8re automatique sur un service web. Ces premiers travaux ont pour vocation d&rsquo;inciter au d\u00e9bat afin de pr\u00e9parer l&rsquo;arriv\u00e9e des produits du programme <a href=\"https:\/\/copernicus.cnes.fr\/\" target=\"_blank\" rel=\"noopener\">Copernicus<\/a> tel Sentinel-2.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>A l&rsquo;occasion d&rsquo;un programme financ\u00e9 par la pr\u00e9fecture de R\u00e9gion Bretagne, le laboratoire Physique et Spatialisation Num\u00e9rique (PSN) d&rsquo;Agrocampus Ouest et l&rsquo;UMR SAS ont d\u00e9ploy\u00e9s &hellip; <\/p>\n","protected":false},"author":1,"featured_media":2361,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[4,9],"tags":[],"class_list":["post-2274","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-donnees","category-toutes-les-actualites"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v24.7 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>La t\u00e9l\u00e9d\u00e9tection d\u00e9barque sur G\u00e9oSAS ! 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