{"id":8791,"date":"2017-04-24T18:57:05","date_gmt":"2017-04-24T16:57:05","guid":{"rendered":"http:\/\/agora.xtec.cat\/formacio\/zenit\/?p=8791"},"modified":"2018-06-13T09:51:54","modified_gmt":"2018-06-13T07:51:54","slug":"p05_ud01-3-titol","status":"publish","type":"post","link":"https:\/\/projectes.xtec.cat\/zenit\/general\/p05_ud01-3-titol\/","title":{"rendered":"1.3. An\u00e0lisi del terreny mitjan\u00e7ant imatges de radar"},"content":{"rendered":"<div class=\"container\">\n<ul class=\"nav nav-tabs nav-pills\">\n<li class=\"nav-item\"><a class=\"nav-link active\" href=\"#practica\" data-toggle=\"tab\">Practica<\/a><\/li>\n<li class=\"nav-item\"><a class=\"nav-link\" href=\"#aplicacions\" data-toggle=\"tab\">Aplicacions<\/a><\/li>\n<\/ul>\n<div class=\"tab-content\" style=\"margin-top: 20px;\">\n<div id=\"practica\" class=\"tab-pane active\">\n<p>La comparaci\u00f3 d&#8217;imatges del terreny obtingudes amb el radar d&#8217;un sat\u00e8l\u00b7lit en diferents moments permet con\u00e8ixer la seva evoluci\u00f3 temporal. Per accedir a les imatges i poder-les comparar, v\u00e9s al <a href=\"https:\/\/apps.sentinel-hub.com\/eo-browser\/\">EO Browser<\/a> de l&#8217;Ag\u00e8ncia Espacial Europea.<\/p>\n<ul>\n<li>Localitza la zona del mapa on vols obtenir les imatges, amb el nivell de zoom adient. Hi ha un cercador a la part superior dreta del mapa.<\/li>\n<li>A la pestanya de cerca, tria <strong><em>Sentinel-1 GRD IW<\/em><\/strong> i un marge de temps d&#8217;adquisici\u00f3 de la imatge (uns pocs dies, per exemple) per obtenir uns quants resultats.<\/li>\n<\/ul>\n<p><a href=\"http:\/\/projectes.xtec.cat\/zenit\/wp-content\/uploads\/usu1639\/2017\/04\/EObrowser.png\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-large wp-image-9589\" src=\"http:\/\/projectes.xtec.cat\/zenit\/wp-content\/uploads\/usu1639\/2017\/04\/EObrowser-1024x625.png\" alt=\"\" width=\"1024\" height=\"625\" srcset=\"https:\/\/projectes.xtec.cat\/zenit\/wp-content\/uploads\/usu1639\/2017\/04\/EObrowser-1024x625.png 1024w, https:\/\/projectes.xtec.cat\/zenit\/wp-content\/uploads\/usu1639\/2017\/04\/EObrowser-300x183.png 300w, https:\/\/projectes.xtec.cat\/zenit\/wp-content\/uploads\/usu1639\/2017\/04\/EObrowser-768x469.png 768w, https:\/\/projectes.xtec.cat\/zenit\/wp-content\/uploads\/usu1639\/2017\/04\/EObrowser.png 1120w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/a><\/p>\n<ul>\n<li>A la pestanya de resultats, tria una de les instant\u00e0nies que inclogui la zona que vols analitzar i visualitza-la.<\/li>\n<li>A la pestanya de visualitzaci\u00f3, tria la visualitzaci\u00f3 <em>RGB_RATIO<\/em> si vols una imatge acolorida.<\/li>\n<\/ul>\n<table>\n<tbody>\n<tr>\n<td><a href=\"http:\/\/projectes.xtec.cat\/zenit\/wp-content\/uploads\/usu1639\/2017\/04\/results.png\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-9590\" src=\"http:\/\/projectes.xtec.cat\/zenit\/wp-content\/uploads\/usu1639\/2017\/04\/results.png\" alt=\"\" width=\"439\" height=\"504\" srcset=\"https:\/\/projectes.xtec.cat\/zenit\/wp-content\/uploads\/usu1639\/2017\/04\/results.png 439w, https:\/\/projectes.xtec.cat\/zenit\/wp-content\/uploads\/usu1639\/2017\/04\/results-261x300.png 261w\" sizes=\"auto, (max-width: 439px) 100vw, 439px\" \/><\/a><\/td>\n<td><a href=\"http:\/\/projectes.xtec.cat\/zenit\/wp-content\/uploads\/usu1639\/2017\/04\/rgb.png\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-9591\" src=\"http:\/\/projectes.xtec.cat\/zenit\/wp-content\/uploads\/usu1639\/2017\/04\/rgb.png\" alt=\"\" width=\"440\" height=\"557\" srcset=\"https:\/\/projectes.xtec.cat\/zenit\/wp-content\/uploads\/usu1639\/2017\/04\/rgb.png 440w, https:\/\/projectes.xtec.cat\/zenit\/wp-content\/uploads\/usu1639\/2017\/04\/rgb-237x300.png 237w\" sizes=\"auto, (max-width: 440px) 100vw, 440px\" \/><\/a><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<ul>\n<li>Fes clic a la icona del pin per desar la imatge.<\/li>\n<\/ul>\n<p>Repeteix el mateix procediment per obtenir una segona imatge de la mateixa zona, per\u00f2 en una data diferent.<\/p>\n<ul>\n<li>A la pestanya <em>My Pins<\/em>, hi tindr\u00e0s les dues imatges preses en dies diferents.<\/li>\n<li>Prem el bot\u00f3 <em>Compare<\/em>. Pots moure els cursors per fixar el nivell d&#8217;opacitat de cada imatge o mostrar-les per separat (esquerra\/dreta).<\/li>\n<\/ul>\n<table>\n<tbody>\n<tr>\n<td><a href=\"http:\/\/projectes.xtec.cat\/zenit\/wp-content\/uploads\/usu1639\/2017\/04\/compare.png\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-9592\" src=\"http:\/\/projectes.xtec.cat\/zenit\/wp-content\/uploads\/usu1639\/2017\/04\/compare.png\" alt=\"\" width=\"440\" height=\"329\" srcset=\"https:\/\/projectes.xtec.cat\/zenit\/wp-content\/uploads\/usu1639\/2017\/04\/compare.png 440w, https:\/\/projectes.xtec.cat\/zenit\/wp-content\/uploads\/usu1639\/2017\/04\/compare-300x224.png 300w, https:\/\/projectes.xtec.cat\/zenit\/wp-content\/uploads\/usu1639\/2017\/04\/compare-200x150.png 200w\" sizes=\"auto, (max-width: 440px) 100vw, 440px\" \/><\/a><\/td>\n<td><a href=\"http:\/\/projectes.xtec.cat\/zenit\/wp-content\/uploads\/usu1639\/2017\/04\/opacity.png\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-9593\" src=\"http:\/\/projectes.xtec.cat\/zenit\/wp-content\/uploads\/usu1639\/2017\/04\/opacity.png\" alt=\"\" width=\"440\" height=\"425\" srcset=\"https:\/\/projectes.xtec.cat\/zenit\/wp-content\/uploads\/usu1639\/2017\/04\/opacity.png 440w, https:\/\/projectes.xtec.cat\/zenit\/wp-content\/uploads\/usu1639\/2017\/04\/opacity-300x290.png 300w\" sizes=\"auto, (max-width: 440px) 100vw, 440px\" \/><\/a><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<div id=\"aplicacions\" class=\"tab-pane\" style=\"margin-top: 20px;\">\n<h2>Detecci\u00f3 i seguiment de zones inundades<\/h2>\n<p>Les imatges de radar obtingudes des d&#8217;un sat\u00e8l\u00b7lit s\u00f3n les m\u00e9s adients per observar el terreny en cas de pluja o de nuvolositat considerable. Quan es donen aquestes circumst\u00e0ncies, les imatges obtingudes per sat\u00e8l\u00b7lits en el rang visible, com el <em>Sentinel-2<\/em>, no aporten informaci\u00f3 \u00fatil. Per contra, els n\u00favols no representen un obstacle per a les ones electromagn\u00e8tiques en el rang de freq\u00fc\u00e8ncies emeses per un radar.<br \/>\nQuan es tracta de detectar i fer el seguiment de desastres en cas d&#8217;inundaci\u00f3, associats a condicions atmosf\u00e8riques desfavorables, es fan servir imatges obtingudes per sat\u00e8l\u00b7lits equipats amb radar, com el <em>Sentinel-1<\/em>.<\/p>\n<p>A finals de mar\u00e7 de 2017 es van produir unes fortes inundacions a la zona de Catacaos, al Per\u00fa. Compara les imatges de radar de la zona propera al riu quan es van produir aquestes inundacions amb les imatges obtingudes en condicions normals. Fes servir el <a href=\"https:\/\/apps.sentinel-hub.com\/eo-browser\/\">EO Browser<\/a> de l&#8217;Ag\u00e8ncia Espacial Europea amb aquesta informaci\u00f3 :<\/p>\n<ul>\n<li>Data : 1 d&#8217;abril de 2017<\/li>\n<li>Latitud : -5,26<\/li>\n<li>Longitud : -80,67<\/li>\n<li>Nivell de zoom : 14<\/li>\n<li>Sat\u00e8l\u00b7lit : Sentinel-1 GRD IW<\/li>\n<\/ul>\n<p><a href=\"http:\/\/projectes.xtec.cat\/zenit\/wp-content\/uploads\/usu1639\/2017\/04\/catacaos.png\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-9602 aligncenter\" src=\"http:\/\/projectes.xtec.cat\/zenit\/wp-content\/uploads\/usu1639\/2017\/04\/catacaos.png\" alt=\"\" width=\"624\" height=\"408\" srcset=\"https:\/\/projectes.xtec.cat\/zenit\/wp-content\/uploads\/usu1639\/2017\/04\/catacaos.png 624w, https:\/\/projectes.xtec.cat\/zenit\/wp-content\/uploads\/usu1639\/2017\/04\/catacaos-300x196.png 300w\" sizes=\"auto, (max-width: 624px) 100vw, 624px\" \/><\/a><\/p>\n<\/div>\n<\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<ul class=\"nav nav-tabs nav-pills\">\n<li class=\"nav-item\"><a class=\"nav-link active\" href=\"#practica\" data-toggle=\"tab\">Practica<\/a><\/li>\n<li class=\"nav-item\"><a class=\"nav-link\" href=\"#aplicacions\" data-toggle=\"tab\">Aplicacions<\/a><\/li>\n<\/ul>\n<p>La comparaci\u00f3 d&#8217;imatges del terreny obtingudes amb el radar d&#8217;un sat\u00e8l\u00b7lit en diferents moments permet con\u00e8ixer la seva evoluci\u00f3 temporal. Per accedir a les imatges i poder-les comparar, v\u00e9s al <a href=\"https:\/\/apps.sentinel-hub.com\/eo-browser\/\">EO Browser<\/a>&hellip;  <a href=\"https:\/\/projectes.xtec.cat\/zenit\/general\/p05_ud01-3-titol\/\" title=\"Read 1.3. An\u00e0lisi del terreny mitjan\u00e7ant imatges de radar\">Llegeix m\u00e9s\u00bb<\/a><\/p>\n","protected":false},"author":3,"featured_media":9593,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_bbp_topic_count":0,"_bbp_reply_count":0,"_bbp_total_topic_count":0,"_bbp_total_reply_count":0,"_bbp_voice_count":0,"_bbp_anonymous_reply_count":0,"_bbp_topic_count_hidden":0,"_bbp_reply_count_hidden":0,"_bbp_forum_subforum_count":0,"footnotes":""},"categories":[1,330],"tags":[306,318],"class_list":["post-8791","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-general","category-obsterra","tag-plafo","tag-ud_radar"],"post_mailing_queue_ids":[],"_links":{"self":[{"href":"https:\/\/projectes.xtec.cat\/zenit\/wp-json\/wp\/v2\/posts\/8791","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/projectes.xtec.cat\/zenit\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/projectes.xtec.cat\/zenit\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/projectes.xtec.cat\/zenit\/wp-json\/wp\/v2\/users\/3"}],"replies":[{"embeddable":true,"href":"https:\/\/projectes.xtec.cat\/zenit\/wp-json\/wp\/v2\/comments?post=8791"}],"version-history":[{"count":4,"href":"https:\/\/projectes.xtec.cat\/zenit\/wp-json\/wp\/v2\/posts\/8791\/revisions"}],"predecessor-version":[{"id":10310,"href":"https:\/\/projectes.xtec.cat\/zenit\/wp-json\/wp\/v2\/posts\/8791\/revisions\/10310"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/projectes.xtec.cat\/zenit\/wp-json\/wp\/v2\/media\/9593"}],"wp:attachment":[{"href":"https:\/\/projectes.xtec.cat\/zenit\/wp-json\/wp\/v2\/media?parent=8791"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/projectes.xtec.cat\/zenit\/wp-json\/wp\/v2\/categories?post=8791"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/projectes.xtec.cat\/zenit\/wp-json\/wp\/v2\/tags?post=8791"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}