{"id":7713,"date":"2022-01-19T16:21:54","date_gmt":"2022-01-19T16:21:54","guid":{"rendered":"https:\/\/www.civile.es\/analise-da-vegetacao-atraves-da-combinacao-de-bandas-espectrais-de-imagens-landsat\/"},"modified":"2025-05-23T07:14:57","modified_gmt":"2025-05-23T07:14:57","slug":"analise-da-vegetacao-atraves-da-combinacao-de-bandas-espectrais-de-imagens-landsat","status":"publish","type":"post","link":"https:\/\/www.civile.es\/pt-pt\/analise-da-vegetacao-atraves-da-combinacao-de-bandas-espectrais-de-imagens-landsat\/","title":{"rendered":"An\u00e1lise da vegeta\u00e7\u00e3o atrav\u00e9s da combina\u00e7\u00e3o de bandas espectrais de imagens Landsat."},"content":{"rendered":"<p>Atrav\u00e9s de estudos de caso recentes, tivemos a oportunidade de nos confrontar com o<strong> mundo das imagens de sat\u00e9lite<\/strong>. E dizemos mundo devido \u00e0 imensa quantidade de informa\u00e7\u00e3o que se pode obter a partir delas e ao potencial de numerosos tratamentos que oferecem. De entre toda esta informa\u00e7\u00e3o, analisamos especificamente <strong>as imagens de sat\u00e9lite Landsat.<\/strong>  <\/p>\n<h4><strong>Estado da vegeta\u00e7\u00e3o existente em determinados momentos<\/strong><\/h4>\n<p>O estudo nasceu com o interesse de <strong>conhecer o estado da vegeta\u00e7\u00e3o existente<\/strong> em determinados momentos do tempo <strong>numa \u00e1rea espec\u00edfica<\/strong>, de forma a servir de justifica\u00e7\u00e3o para a <strong>utiliza\u00e7\u00e3o da \u00e1gua para rega <\/strong>. A an\u00e1lise do terreno por meio de <strong>ortofotos, tanto atuais quanto hist\u00f3ricas<\/strong>, \u00e9 comum no nosso dia a dia. No entanto, para consultas em datas espec\u00edficas, mesmo em per\u00edodos antigos, os ortofotos conhecidos para consulta, como os V\u00f4os Americanos, os V\u00f4os Interministeriais e os V\u00f4os Nacionais do Plano Geral de Ortofotografia A\u00e9rea (PNOA), podem ser insuficientes, por isso recorremos \u00e0s imagens Landsat. <\/p>\n<h4>O que \u00e9 o Landsat?<\/h4>\n<p>Os sat\u00e9lites Landsat s\u00e3o sat\u00e9lites lan\u00e7ados em \u00f3rbita pelos Estados Unidos para observar a superf\u00edcie da Terra. O primeiro sat\u00e9lite, Landsat 1, foi lan\u00e7ado em julho de 1972, e desde ent\u00e3o, novos lan\u00e7amentos foram feitos at\u00e9 hoje. Atualmente,<strong> o \u00faltimo sat\u00e9lite a ser lan\u00e7ado foi o Landsat 9, em setembro de 2021<\/strong>, que dever\u00e1 libertar imagens no in\u00edcio de 2022.  <\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-6394 size-full\" src=\"https:\/\/www.civile.es\/wp-content\/uploads\/2023\/06\/building-on-the-landsat-legacy-captura.jpg\" alt=\"Cronologia do programa Landsat\" width=\"889\" height=\"454\"><\/p>\n<p style=\"text-align: center;\"><em>Cronologia do programa Landsat<\/em><\/p>\n<p>As informa\u00e7\u00f5es obtidas s\u00e3o apresentadas sob a forma de<strong>  bandas espectrais a diferentes frequ\u00eancias.<\/strong>  O n\u00famero de bandas e as frequ\u00eancias que cobrem variam de sat\u00e9lite para sat\u00e9lite. No nosso caso, obtivemos os dados do sensor <strong>Landsat Thematic Mapper (TM)<\/strong>, que foi transportado a bordo do Landsat 4 e 5, para o per\u00edodo de anos que cobre, por volta de 1990. Fornece <strong>6 bandas espectrais<\/strong> e <strong>1 banda de infravermelho termal<\/strong>. Com este tipo de imagens, perde-se precis\u00e3o e resolu\u00e7\u00e3o, mas ganha-se em variedade de informa\u00e7\u00e3o.   <\/p>\n<figure id=\"attachment_7609\" class=\"thumbnail wp-caption aligncenter\" style=\"width: 1039px\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-7086 size-full\" src=\"https:\/\/www.civile.es\/wp-content\/uploads\/2023\/06\/tabla-imagenes-landsat.jpg\" alt=\"\" width=\"1039\" height=\"443\" srcset=\"https:\/\/www.civile.es\/wp-content\/uploads\/2023\/06\/tabla-imagenes-landsat.jpg 1039w, https:\/\/www.civile.es\/wp-content\/uploads\/2023\/06\/tabla-imagenes-landsat-300x128.jpg 300w, https:\/\/www.civile.es\/wp-content\/uploads\/2023\/06\/tabla-imagenes-landsat-1024x437.jpg 1024w, https:\/\/www.civile.es\/wp-content\/uploads\/2023\/06\/tabla-imagenes-landsat-768x327.jpg 768w\" sizes=\"auto, (max-width: 1039px) 100vw, 1039px\" \/><figcaption class=\"caption wp-caption-text\">Carater\u00edsticas das bandas do Landsat 5 Thematic Mapper (TM).<\/figcaption><\/figure>\n<p style=\"text-align: center;\">\n<em>Carater\u00edsticas das bandas do Landsat 5 Thematic Mapper (TM).<\/em><\/p>\n<p style=\"text-align: left;\">A partir das diferentes bandas, ao efetuar combina\u00e7\u00f5es e opera\u00e7\u00f5es com elas, podem ser observadas certas carater\u00edsticas. Vejamos um exemplo: <strong>combina\u00e7\u00e3o R-G-B.<\/strong> Esta combina\u00e7\u00e3o \u00e9 obtida utilizando as bandas 3, 2 e 1, para este sat\u00e9lite espec\u00edfico, e oferece a imagem mais pr\u00f3xima das cores reais. Podemos compar\u00e1-la com as ortofotos que normalmente utilizamos.  <\/p>\n<h4 style=\"text-align: left;\">Identifica as parcelas que est\u00e3o a ser irrigadas com o Landsat<\/h4>\n<p style=\"text-align: left;\">No nosso caso, utiliz\u00e1mos a combina\u00e7\u00e3o das bandas 4, 3, 2: NIR-R-G. A banda do infravermelho pr\u00f3ximo (L5 Banda 4) \u00e9 \u00fatil para <strong>identificar a fronteira entre o solo e a \u00e1gua<\/strong> e \u00e9 tamb\u00e9m sens\u00edvel \u00e0 clorofila, permitindo-nos assim <strong>observar varia\u00e7\u00f5es na vegeta\u00e7\u00e3o, em tons de vermelho.<\/strong> As massas de \u00e1gua aparecem em tons de azul, de claro a escuro com o aumento ou diminui\u00e7\u00e3o da carga de sedimentos em suspens\u00e3o. A vegeta\u00e7\u00e3o densa apresenta-se em vermelho forte, tornando-se mais escura \u00e0 medida que a vegeta\u00e7\u00e3o se torna mais rala.   <\/p>\n<figure id=\"attachment_7610\" class=\"thumbnail wp-caption aligncenter\" style=\"width: 738px\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-7087 size-full\" src=\"https:\/\/www.civile.es\/wp-content\/uploads\/2023\/06\/imagenes-landsat.jpg\" alt=\"\" width=\"738\" height=\"439\" srcset=\"https:\/\/www.civile.es\/wp-content\/uploads\/2023\/06\/imagenes-landsat.jpg 738w, https:\/\/www.civile.es\/wp-content\/uploads\/2023\/06\/imagenes-landsat-300x178.jpg 300w\" sizes=\"auto, (max-width: 738px) 100vw, 738px\" \/><figcaption class=\"caption wp-caption-text\">Combina\u00e7\u00e3o de bandas RGB 432 da imagem Landsat 5 &#8211; junho de 1998, zona da prov\u00edncia de Sevilha.<\/figcaption><\/figure>\n<p style=\"text-align: center;\">\n<p>Desta forma, ao consultar as imagens de ver\u00e3o, pudemos saber <strong>qual a parcela que foi regada<\/strong> e qual a que n\u00e3o <strong>foi<\/strong>, num relance, observando o vermelho da <strong>vegeta\u00e7\u00e3o detectada pelo sat\u00e9lite<\/strong>. Atrav\u00e9s da combina\u00e7\u00e3o de bandas espectrais, \u00e9 poss\u00edvel extrair informa\u00e7\u00e3o do terreno como a humidade do solo e da vegeta\u00e7\u00e3o, temperaturas, urbaniza\u00e7\u00e3o e \u00e1reas urbanas, texturas e culturas, etc.<br \/>\nEstas imagens est\u00e3o dispon\u00edveis para download atrav\u00e9s do visualizador USGS EarthExplorer.<\/p>\n<hr>\n<p>Escrito por:<\/p>\n<p><strong>Isabel Mart\u00edn L\u00f3pez<br \/>\n<\/strong><span data-sheets-value=\"{\"1\":2,\"2\":\"Isabel Mart\u00edn L\u00f3pez ; Ingeniera de Caminos, Canales y Puertos ; \u00c1rea de Ingenier\u00eda Civil ; Secci\u00f3n de Ingenier\u00eda del Agua\"}\" data-sheets-userformat=\"{\"2\":14529,\"3\":{\"1\":0,\"3\":1},\"9\":1,\"10\":1,\"14\":{\"1\":3,\"3\":1},\"15\":\"Calibri\",\"16\":11}\" data-sheets-formula=\"=+CONCATENAR(R[0]C[-7];\" ; \";R[0]C[-5];\" ; \";R[0]C[-4];\" \u00c1rea de \";R[0]C[-3];\" ; \";\" Secci\u00f3n de \";R[0]C[-2] )\">Engenheira Civil.<br \/>\n<\/span><span data-sheets-value=\"{\"1\":2,\"2\":\"Isabel Mart\u00edn L\u00f3pez ; Ingeniera de Caminos, Canales y Puertos ; \u00c1rea de Ingenier\u00eda Civil ; Secci\u00f3n de Ingenier\u00eda del Agua\"}\" data-sheets-userformat=\"{\"2\":14529,\"3\":{\"1\":0,\"3\":1},\"9\":1,\"10\":1,\"14\":{\"1\":3,\"3\":1},\"15\":\"Calibri\",\"16\":11}\" data-sheets-formula=\"=+CONCATENAR(R[0]C[-7];\" ; \";R[0]C[-5];\" ; \";R[0]C[-4];\" \u00c1rea de \";R[0]C[-3];\" ; \";\" Secci\u00f3n de \";R[0]C[-2] )\">\u00c1rea de Engenharia Civil. <\/span><span data-sheets-value=\"{\"1\":2,\"2\":\"Isabel Mart\u00edn L\u00f3pez ; Ingeniera de Caminos, Canales y Puertos ; \u00c1rea de Ingenier\u00eda Civil ; Secci\u00f3n de Ingenier\u00eda del Agua\"}\" data-sheets-userformat=\"{\"2\":14529,\"3\":{\"1\":0,\"3\":1},\"9\":1,\"10\":1,\"14\":{\"1\":3,\"3\":1},\"15\":\"Calibri\",\"16\":11}\" data-sheets-formula=\"=+CONCATENAR(R[0]C[-7];\" ; \";R[0]C[-5];\" ; \";R[0]C[-4];\" \u00c1rea de \";R[0]C[-3];\" ; \";\" Secci\u00f3n de \";R[0]C[-2] )\">Sec\u00e7\u00e3o de Engenharia da \u00c1gua<\/span><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Atrav\u00e9s de estudos de caso recentes, tivemos a oportunidade de nos confrontar com o mundo das imagens de sat\u00e9lite. E dizemos mundo devido \u00e0 imensa quantidade de informa\u00e7\u00e3o que se<\/p>\n","protected":false},"author":6,"featured_media":7607,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[70],"tags":[71,72],"class_list":["post-7713","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-engenharia-de-transportes","tag-agua-de-irrigacao","tag-landsat-pt-pt"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>An\u00e1lise da vegeta\u00e7\u00e3o com imagens Landsat - CIVILE<\/title>\n<meta name=\"description\" content=\"Estado da vegeta\u00e7\u00e3o existente em determinadas \u00e9pocas para servir de justifica\u00e7\u00e3o para a utiliza\u00e7\u00e3o da \u00e1gua de rega.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, 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