{"id":19294,"date":"2024-01-14T10:31:55","date_gmt":"2024-01-14T05:01:55","guid":{"rendered":"https:\/\/vajiramandravi.com\/current-affairs\/?p=19294"},"modified":"2025-04-05T16:33:19","modified_gmt":"2025-04-05T11:03:19","slug":"lidar","status":"publish","type":"post","link":"https:\/\/vajiramandravi.com\/current-affairs\/lidar\/","title":{"rendered":"What is LiDAR?"},"content":{"rendered":"<h2>About LiDAR<\/h2>\n<ul>\n<li>Lidar, which stands for\u00a0Light Detection and Ranging, is a\u00a0remote sensing method that\u00a0uses light\u00a0in the form of a pulsed laser to measure ranges (variable distances) to the Earth.\u00a0<\/li>\n<li>These light pulses\u2014combined with other data recorded by the airborne system \u2014\u00a0generate precise, three-dimensional information about the shape of the Earth and its surface characteristics.<\/li>\n<li>A lidar instrument principally\u00a0consists of a laser, a scanner, and a specialized GPS receiver.\u00a0<\/li>\n<li>Airplanes\u00a0and helicopters are the\u00a0most\u00a0commonly used platforms for acquiring lidar data over broad areas.<\/li>\n<li>How Does it Work?\n<ul>\n<li>A LiDAR system\u00a0calculates how long it takes for beams of light to hit an object or surface\u00a0and reflect back\u00a0to the laser scanner.<\/li>\n<li>The\u00a0distance is then calculated using the velocity of light. These are known as \u2018Time of Flight\u2019 measurements.\u00a0<\/li>\n<\/ul>\n<\/li>\n<li>Two types of lidar are topographic and bathymetric.\n<ul>\n<li>Topographic lidar\u00a0typically uses a near-infrared laser to map the land, while\u00a0bathymetric lidar uses water-penetrating green light to also measure seafloor and riverbed elevations.<\/li>\n<\/ul>\n<\/li>\n<li>Lidar systems allow scientists and mapping professionals\u00a0to examine both natural and man-made environments\u00a0with accuracy, precision, and flexibility.\u00a0<\/li>\n<li>It is used in a wide range of land management and planning efforts, including hazard assessment (including lava flows, landslides, tsunamis, and floods), forestry, agriculture, geologic mapping, and watershed and river surveys.<\/li>\n<li>What is the difference between Radar and LiDAR?\n<ul>\n<li>LiDAR works in a\u00a0similar way to Radar and Sonar yet\u00a0uses light waves from a laser, instead of radio or sound waves.<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<hr \/>\n<h3>Q1) What is a Radar?<\/h3>\n<p>The word radar comes from the acronym radio detection and ranging. As the name implies, radars use radio waves to determine the distance and velocity of the targets they hit. A radar system usually consists of a transmitter to send out radio signals and a receiver to catch any reflected energy from targets.<\/p>\n<p><strong>Source:<\/strong> <a href=\"https:\/\/www.ndtv.com\/world-news\/3-000-year-old-city-hidden-in-amazon-rainforest-discovered-4847729\" target=\"_blank\" rel=\"nofollow noopener\"><u>3,000-Year-Old City Hidden In Amazon Rainforest Discovered<\/u><\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Lidar, which stands for Light Detection and Ranging, is a remote sensing method that uses light in the form of a pulsed laser to measure ranges (variable distances) to the Earth. <\/p>\n","protected":false},"author":5,"featured_media":19295,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[1],"tags":[],"class_list":{"0":"post-19294","1":"post","2":"type-post","3":"status-publish","4":"format-standard","5":"has-post-thumbnail","7":"category-upsc-prelims-current-affairs","8":"no-featured-image-padding"},"acf":[],"_links":{"self":[{"href":"https:\/\/vajiramandravi.com\/current-affairs\/wp-json\/wp\/v2\/posts\/19294","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/vajiramandravi.com\/current-affairs\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/vajiramandravi.com\/current-affairs\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/vajiramandravi.com\/current-affairs\/wp-json\/wp\/v2\/users\/5"}],"replies":[{"embeddable":true,"href":"https:\/\/vajiramandravi.com\/current-affairs\/wp-json\/wp\/v2\/comments?post=19294"}],"version-history":[{"count":0,"href":"https:\/\/vajiramandravi.com\/current-affairs\/wp-json\/wp\/v2\/posts\/19294\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/vajiramandravi.com\/current-affairs\/wp-json\/wp\/v2\/media\/19295"}],"wp:attachment":[{"href":"https:\/\/vajiramandravi.com\/current-affairs\/wp-json\/wp\/v2\/media?parent=19294"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/vajiramandravi.com\/current-affairs\/wp-json\/wp\/v2\/categories?post=19294"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/vajiramandravi.com\/current-affairs\/wp-json\/wp\/v2\/tags?post=19294"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}