Khi tia s\u00e1ng M\u1eb7t tr\u1eddi truy\u1ec1n qua kh\u00ed quy\u1ec3n t\u1edbi Tr\u00e1i \u0110\u1ea5t, m\u1ed9t ph\u1ea7n c\u1ee7a ph\u1ed5 \u0111i\u1ec7n t\u1eeb (d\u1ea3i h\u1ea5p th\u1ee5 – absorption bands) s\u1ebd b\u1ecb h\u1ea5p th\u1ee5 b\u1edfi ozone, h\u01a1i n\u01b0\u1edbc, carbon dioxide v\u00e0 c\u00e1c ph\u00e2n t\u1eed kh\u00e1c trong kh\u00ed quy\u1ec3n. K\u1ebft qu\u1ea3 l\u00e0 ch\u1ec9 m\u1ed9t ph\u1ea7n c\u1ee5 th\u1ec3 c\u1ee7a ph\u1ed5 \u0111i\u1ec7n t\u1eeb c\u00f3 th\u1ec3 \u0111\u1ebfn v\u1edbi ch\u00fang ta. Hi\u1ec7n t\u01b0\u1ee3ng n\u00e0y \u0111\u01b0\u1ee3c g\u1ecdi l\u00e0 c\u1eeda s\u1ed5 kh\u00ed quy\u1ec3n (atmospheric windows) c\u1ee7a Tr\u00e1i \u0110\u1ea5t.<\/p>\n
Trong vi\u1ec5n th\u00e1m, c\u00e1c c\u1ea3m bi\u1ebfn (sensors) \u0111\u01b0\u1ee3c ch\u1ebf t\u1ea1o \u0111\u1ec3 thu nh\u1eadn c\u00e1c ph\u1ea7n quang ph\u1ed5 c\u1ee5 th\u1ec3 \u0111\u00f3.<\/p>\n
![\"Atmospheric-Window-1-425x203\"](\"https:\/\/user-images.githubusercontent.com\/72865384\/173330872-2f3503bf-28a4-419c-98f0-7fe72bbacf4a.png\")
\nBi\u1ec3u \u0111\u1ed3 tr\u00ean cho th\u1ea5y c\u00e1c c\u1eeda s\u1ed5 kh\u00ed quy\u1ec3n c\u1ee7a Tr\u00e1i \u0111\u1ea5t. B\u1ee9c x\u1ea1 ph\u1ed5 (m\u00e0u xanh lam) l\u00e0 nh\u1eefng g\u00ec c\u1ea3m bi\u1ebfn c\u00f3 kh\u1ea3 n\u0103ng nh\u00ecn th\u1ea5y tr\u00ean Tr\u00e1i \u0111\u1ea5t.<\/p>\n
M\u1eaft ch\u00fang ta c\u00f3 th\u1ec3 nh\u00ecn th\u1ea5y m\u00e0u \u0111\u1ecf, xanh l\u1ee5c v\u00e0 xanh lam, t\u1ee9c v\u00f9ng \u00e1nh s\u00e1ng kh\u1ea3 ki\u1ebfn. Th\u1ea3m th\u1ef1c v\u1eadt kh\u1ecfe m\u1ea1nh (ho\u1eb7c di\u1ec7p l\u1ee5c) ph\u1ea3n chi\u1ebfu \u00e1nh s\u00e1ng xanh l\u1ee5c nhi\u1ec1u h\u01a1n, tuy nhi\u00ean n\u00f3 h\u1ea5p th\u1ee5 nhi\u1ec1u \u00e1nh s\u00e1ng \u0111\u1ecf v\u00e0 xanh lam h\u01a1n. \u0110\u00f3 l\u00e0 l\u00fd do t\u1ea1i sao m\u1eaft c\u1ee7a ch\u00fang ta nh\u00ecn th\u1ea5y th\u1ef1c v\u1eadt l\u00e0 m\u00e0u xanh l\u1ee5c. Tr\u00ean th\u1ef1c t\u1ebf, \u0111\u00e2y l\u00e0 nguy\u00ean l\u00fd c\u1ee7a Ch\u1ec9 s\u1ed1 Th\u1ef1c v\u1eadt (NDVI) trong vi\u1ec5n th\u00e1m.<\/p>\n
C\u00e1c k\u1ef9 s\u01b0 c\u0169ng thi\u1ebft k\u1ebf c\u1ea3m bi\u1ebfn \u0111\u1ec3 ph\u00e1t hi\u1ec7n \u00e1nh s\u00e1ng kh\u00f4ng nh\u00ecn th\u1ea5y. V\u00ed d\u1ee5, th\u1ea3m th\u1ef1c v\u1eadt ph\u1ea3n x\u1ea1 \u00e1nh s\u00e1ng c\u1eadn h\u1ed3ng ngo\u1ea1i (NIR) v\u00f4 h\u00ecnh v\u1edbi m\u1eaft ng\u01b0\u1eddi. Nh\u01b0ng c\u00e1c c\u1ea3m bi\u1ebfn c\u00f3 th\u1ec3 nh\u1eadn \u0111\u01b0\u1ee3c th\u00f4ng tin ph\u1ed5 n\u00e0y. N\u1ebfu b\u1ea1n th\u1ef1c hi\u1ec7n b\u1ea5t k\u1ef3 lo\u1ea1i k\u1ef9 thu\u1eadt ph\u00e2n lo\u1ea1i h\u00ecnh \u1ea3nh n\u00e0o trong vi\u1ec5n th\u00e1m, r\u1ea5t c\u00f3 th\u1ec3 b\u1ea1n s\u1ebd s\u1eed d\u1ee5ng c\u00e1c nguy\u00ean l\u00fd n\u00e0y. Nhi\u1ec1u lo\u1ea1i c\u1ea3m bi\u1ebfn \u0111\u1eb7c bi\u1ec7t c\u00f3 th\u1ec3 ti\u1ebft l\u1ed9 nh\u1eefng hi\u1ec3u bi\u1ebft m\u1edbi v\u1ec1 c\u00e1c v\u1eadt th\u1ec3 tr\u00ean Tr\u00e1i \u0110\u1ea5t, m\u00e0 m\u1eaft ng\u01b0\u1eddi kh\u00f4ng th\u1ec3.<\/p>\n
C\u1eeda s\u1ed5 kh\u00ed quy\u1ec3n (atmospheric windows) l\u00e0 c\u00e1c b\u01b0\u1edbc s\u00f3ng b\u1ee9c x\u1ea1 \u0111i\u1ec7n t\u1eeb m\u1eb7t tr\u1eddi xuy\u00ean qua \u0111\u01b0\u1ee3c b\u1ea7u kh\u00ed quy\u1ec3n Tr\u00e1i \u0111\u1ea5t. C\u00f2n c\u00e1c b\u01b0\u1edbc s\u00f3ng b\u1ecb h\u1ea5p th\u1ee5 b\u1edfi kh\u00ed quy\u1ec3n g\u1ecdi l\u00e0 d\u1ea3i h\u1ea5p th\u1ee5 (absorption bands).
\nVi\u1ec5n th\u00e1m kh\u00f4ng ch\u1ec9 t\u1eadn d\u1ee5ng d\u1ea3i ph\u1ed5 kh\u1ea3 ki\u1ebfn (\u0111\u1ecf, l\u1ee5c v\u00e0 lam) m\u00e0 c\u1ea3 c\u00e1c d\u1ea3i ph\u1ed5 kh\u00f4ng nh\u00ecn th\u1ea5y \u0111\u01b0\u1ee3c (h\u1ed3ng ngo\u1ea1i, radar,…).<\/p>\n
https:\/\/gisgeography.com\/atmospheric-window\/<\/a> Khi tia s\u00e1ng M\u1eb7t tr\u1eddi truy\u1ec1n qua kh\u00ed quy\u1ec3n t\u1edbi Tr\u00e1i \u0110\u1ea5t, m\u1ed9t ph\u1ea7n c\u1ee7a ph\u1ed5 \u0111i\u1ec7n t\u1eeb (d\u1ea3i h\u1ea5p th\u1ee5 – absorption bands) s\u1ebd b\u1ecb h\u1ea5p… <\/p>","protected":false},"author":2,"featured_media":70,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[6],"tags":[20,19,11],"class_list":["post-69","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-vien-tham-share","tag-atmospheric-windows","tag-cua-so-khi-quyen","tag-vien-tham"],"_links":{"self":[{"href":"https:\/\/opengis.vn\/en\/wp-json\/wp\/v2\/posts\/69","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/opengis.vn\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/opengis.vn\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/opengis.vn\/en\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/opengis.vn\/en\/wp-json\/wp\/v2\/comments?post=69"}],"version-history":[{"count":1,"href":"https:\/\/opengis.vn\/en\/wp-json\/wp\/v2\/posts\/69\/revisions"}],"predecessor-version":[{"id":71,"href":"https:\/\/opengis.vn\/en\/wp-json\/wp\/v2\/posts\/69\/revisions\/71"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/opengis.vn\/en\/wp-json\/wp\/v2\/media\/70"}],"wp:attachment":[{"href":"https:\/\/opengis.vn\/en\/wp-json\/wp\/v2\/media?parent=69"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/opengis.vn\/en\/wp-json\/wp\/v2\/categories?post=69"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/opengis.vn\/en\/wp-json\/wp\/v2\/tags?post=69"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}
\nhttps:\/\/earthobservatory.nasa.gov\/features\/RemoteSensing\/remote_04.php<\/a><\/p>","protected":false},"excerpt":{"rendered":"