{"id":3860,"date":"2026-02-19T13:18:41","date_gmt":"2026-02-19T12:18:41","guid":{"rendered":"https:\/\/esa-schoolatlas.eu\/esa-schoolatlas\/?post_type=glossary&#038;p=3860"},"modified":"2026-02-19T13:18:41","modified_gmt":"2026-02-19T12:18:41","slug":"tm","status":"publish","type":"glossary","link":"https:\/\/esa-schoolatlas.eu\/esa-schoolatlas\/it\/glossary\/tm\/","title":{"rendered":"TM"},"content":{"rendered":"<p>Thematic Mapper. <a class=\"glossaryLink\" title=\"Glossary: multispectral\" aria-describedby=\"tt\" data-cmtooltip=\"&lt;div class=glossaryItemTitle&gt;multispectral&lt;\/div&gt;&lt;div class=glossaryItemBody&gt;Comprising data from different, separated (discrete) spectral bands.&lt;\/div&gt;\" href=\"https:\/\/esa-schoolatlas.eu\/esa-schoolatlas\/it\/glossary\/multispectral\/\" target=\"_blank\" data-gt-translate-attributes='[{\"attribute\":\"data-cmtooltip\", \"format\":\"html\"}]' tabindex=\"0\" role=\"link\">Multispectral<\/a> imaging <a class=\"glossaryLink\" title=\"Glossary: sensor\" aria-describedby=\"tt\" data-cmtooltip=\"&lt;div class=glossaryItemTitle&gt;sensor&lt;\/div&gt;&lt;div class=glossaryItemBody&gt;Device producing an output in response to incident radiation. Sensors aboard satellites obtain information about features and objects on Earth by detecting radiation reflected or emitted in different bands of the electromagnetic spectrum.&lt;\/div&gt;\" href=\"https:\/\/esa-schoolatlas.eu\/esa-schoolatlas\/it\/glossary\/sensor\/\" target=\"_blank\" data-gt-translate-attributes='[{\"attribute\":\"data-cmtooltip\", \"format\":\"html\"}]' tabindex=\"0\" role=\"link\">sensor<\/a> with 7 spectral bands on board of <a class=\"glossaryLink\" title=\"Glossary: Landsat\" aria-describedby=\"tt\" data-cmtooltip=\"&lt;div class=glossaryItemTitle&gt;Landsat&lt;\/div&gt;&lt;div class=glossaryItemBody&gt;Land Remote-Sensing Satellite, Series of Earth observation satellites first launched in 1973 and operated by the U.S. Earth Observation Satellite Company (EOSAT). Commercialized under the Land Remote-Sensing Commercialization Act of 1984, Landsat is a series of satellites (formerly called ERTS) designed to gather data on the Earth&#x2019;s resources in a regular and systematic manner.&lt;\/div&gt;\" href=\"https:\/\/esa-schoolatlas.eu\/esa-schoolatlas\/it\/glossary\/landsat\/\" target=\"_blank\" data-gt-translate-attributes='[{\"attribute\":\"data-cmtooltip\", \"format\":\"html\"}]' tabindex=\"0\" role=\"link\">Landsat<\/a>-4 and Landsat-5, acquiring data in the visible and infrared parts of the <a class=\"glossaryLink\" title=\"Glossary: electromagnetic spectrum\" aria-describedby=\"tt\" data-cmtooltip=\"&lt;div class=glossaryItemTitle&gt;electromagnetic spectrum&lt;\/div&gt;&lt;div class=glossaryItemBody&gt;The entire range of radiant energies or wave frequencies from the longest to the shortest wavelengths. The spectrum usually is divided into seven sections: radio, microwave, infrared, visible, ultraviolet, x-ray, and gamma-ray radiation.&lt;\/div&gt;\" href=\"https:\/\/esa-schoolatlas.eu\/esa-schoolatlas\/it\/glossary\/electromagnetic-spectrum\/\" target=\"_blank\" data-gt-translate-attributes='[{\"attribute\":\"data-cmtooltip\", \"format\":\"html\"}]' tabindex=\"0\" role=\"link\">electromagnetic spectrum<\/a>. The <a class=\"glossaryLink\" title=\"Glossary: ground resolution\" aria-describedby=\"tt\" data-cmtooltip=\"&lt;div class=glossaryItemTitle&gt;ground resolution&lt;\/div&gt;&lt;div class=glossaryItemBody&gt;Describes the length of the side of a single square pixel in an image on the Earth surface, e.g. 30 m\/pixel. The smaller this value is, the more precise and detailed the image is.&lt;\/div&gt;\" href=\"https:\/\/esa-schoolatlas.eu\/esa-schoolatlas\/it\/glossary\/ground-resolution\/\" target=\"_blank\" data-gt-translate-attributes='[{\"attribute\":\"data-cmtooltip\", \"format\":\"html\"}]' tabindex=\"0\" role=\"link\">ground resolution<\/a> of the visible and short-<a class=\"glossaryLink\"  title=\"Glossary: wave\"  aria-describedby=\"tt\"  data-cmtooltip=\"&lt;div class=glossaryItemTitle&gt;wave&lt;\/div&gt;&lt;div class=glossaryItemBody&gt;Moving changes of a parameter, periodical in space and time, e.g. sound waves or electromagnetic radiation.&lt;\/div&gt;\"  href=\"https:\/\/esa-schoolatlas.eu\/esa-schoolatlas\/it\/glossary\/wave\/\"  target=\"_blank\"  data-gt-translate-attributes='[{\"attribute\":\"data-cmtooltip\", \"format\":\"html\"}]'  tabindex='0' role='link'>wave<\/a> infrared bands is 30 m\/<a class=\"glossaryLink\"  title=\"Glossary: pixel\"  aria-describedby=\"tt\"  data-cmtooltip=\"&lt;div class=glossaryItemTitle&gt;pixel&lt;\/div&gt;&lt;div class=glossaryItemBody&gt;Picture element. Ground area corresponding to a single element of a digital image data set.&lt;\/div&gt;\"  href=\"https:\/\/esa-schoolatlas.eu\/esa-schoolatlas\/it\/glossary\/pixel\/\"  target=\"_blank\"  data-gt-translate-attributes='[{\"attribute\":\"data-cmtooltip\", \"format\":\"html\"}]'  tabindex='0' role='link'>pixel<\/a>, the thermal <a class=\"glossaryLink\"  title=\"Glossary: band\"  aria-describedby=\"tt\"  data-cmtooltip=\"&lt;div class=glossaryItemTitle&gt;band&lt;\/div&gt;&lt;div class=glossaryItemBody&gt;A region of the electromagnetic spectrum to which a remote sensor responds; a multispectral sensor makes measurements in a number of spectral bands.&lt;\/div&gt;\"  href=\"https:\/\/esa-schoolatlas.eu\/esa-schoolatlas\/it\/glossary\/band\/\"  target=\"_blank\"  data-gt-translate-attributes='[{\"attribute\":\"data-cmtooltip\", \"format\":\"html\"}]'  tabindex='0' role='link'>band<\/a> 120 m\/pixel.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Thematic Mapper. Multispectral imaging sensor with 7 spectral bands on board of Landsat-4 and Landsat-5, acquiring data in the visible and infrared parts of the electromagnetic spectrum. The ground <a class=\"glossaryLink\" title=\"Glossary: resolution\" aria-describedby=\"tt\" data-cmtooltip=\"&lt;div class=glossaryItemTitle&gt;resolution&lt;\/div&gt;&lt;div class=glossaryItemBody&gt;Level of detail an image holds. It is typically measured by the size of pixels (area on the Earth surface covered by one pixel) in the image, often expressed as width &#xD7; height, and indicates how much detail can be captured or displayed. Higher resolution means more detail and clarity in the image.&lt;\/div&gt;\" href=\"https:\/\/esa-schoolatlas.eu\/esa-schoolatlas\/it\/glossary\/resolution\/\" target=\"_blank\" data-gt-translate-attributes='[{\"attribute\":\"data-cmtooltip\", \"format\":\"html\"}]' tabindex=\"0\" role=\"link\">resolution<\/a> of the visible and short-wave infrared bands is 30 m\/pixel, the thermal band 120 m\/pixel.<\/p>\n","protected":false},"author":2,"featured_media":0,"menu_order":0,"template":"","meta":{"footnotes":""},"class_list":["post-3860","glossary","type-glossary","status-publish","hentry"],"translation":{"provider":"WPGlobus","version":"3.0.0","language":"it","enabled_languages":["en","es","de","fr","it"],"languages":{"en":{"title":true,"content":true,"excerpt":false},"es":{"title":false,"content":false,"excerpt":false},"de":{"title":false,"content":false,"excerpt":false},"fr":{"title":false,"content":false,"excerpt":false},"it":{"title":false,"content":false,"excerpt":false}}},"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.3 - 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