{"id":4635,"date":"2023-08-24T17:56:14","date_gmt":"2023-08-24T17:56:14","guid":{"rendered":"https:\/\/dailyai.com\/?p=4635"},"modified":"2023-08-24T19:25:08","modified_gmt":"2023-08-24T19:25:08","slug":"researchers-harness-satellite-data-to-create-accurate-tsunami-warning-system","status":"publish","type":"post","link":"https:\/\/dailyai.com\/da\/2023\/08\/researchers-harness-satellite-data-to-create-accurate-tsunami-warning-system\/","title":{"rendered":"Forskere udnytter satellitdata til at skabe et pr\u00e6cist tsunami-advarselssystem"},"content":{"rendered":"<p><b>Forskerne brugte AI til at identificere \u00e6ndringer i Jordens atmosf\u00e6re, som opst\u00e5r, n\u00e5r tsunamib\u00f8lger begynder at dannes i havet.\u00a0<\/b><\/p>\n<p><span style=\"font-weight: 400;\">Det kan forl\u00e6nge advarselstiden betydeligt for kystsamfund, der er udsat for risiko for tsunamier.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Valentino Constantinou fra Terran Orbital Corporation i Florida forklarer: \"Der findes ikke noget globalt netv\u00e6rk til at opdage tsunamib\u00f8lger, og det er dyrt at installere fysisk hardware, som f.eks. b\u00f8jebaserede systemer. Men vi ved, at sm\u00e5 satellitkonstellationer spreder sig overalt.\"<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Hastigheden af signalerne fra jordsk\u00e6lv til havs p\u00e5virkes af t\u00e6theden af ladede partikler i jordens ionosf\u00e6re, som befinder sig omkring 300 til 350 kilometer over overfladen. <\/span><\/p>\n<p><span style=\"font-weight: 400;\">N\u00e5r en tsunami genererer chokb\u00f8lger, der stiger op i atmosf\u00e6ren, \u00e6ndrer de t\u00e6theden af disse ladede partikler, hvilket f\u00f8rer til sm\u00e5, men p\u00e5viselige \u00e6ndringer i de signaler, der modtages af satellitter.<\/span><\/p>\n<p><span style=\"font-weight: 400;\"><a href=\"https:\/\/www.jpl.nasa.gov\/news\/scientists-look-to-skies-to-improve-tsunami-detection\">Tidligere forskning<\/a> udf\u00f8rt af NASA's Jet Propulsion Laboratory og Sapienza University of Rome i Italien f\u00f8rte til en beregningsmetode til m\u00e5ling af udsving i ladede partiklers t\u00e6thed p\u00e5 grund af tsunamier.\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">P\u00e5 baggrund af dette konverterede Constantinou og hans team dataene, der oprindeligt var i endimensionelle formater, til todimensionelle billeder. Disse billeder blev derefter analyseret af AI-modeller for tegn relateret til tsunamier.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Holdet tr\u00e6nede deres AI-system ved hj\u00e6lp af data fra tre specifikke jordsk\u00e6lvsinducerede tsunamier: tsunamierne i Chile i 2010, Japan i 2011 og Canada i 2012.\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">De testede modellens effektivitet p\u00e5 en fjerde tsunami for\u00e5rsaget af Illapel-jordsk\u00e6lvet i Chile i 2015. AI'en blev unders\u00f8gt for at vurdere, hvor godt den kunne skelne mellem tsunami-inducerede \u00e6ndringer og standard ionosf\u00e6risk baggrundsst\u00f8j.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">For at minimere falske positiver filtrerede forskerne forstyrrelser for\u00e5rsaget af jordstationer i kommunikation med de overliggende satellitter.\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">If\u00f8lge Quentin Brissaud fra NORSAR, en norsk seismisk forskningsstiftelse, som ikke er tilknyttet unders\u00f8gelsen, gav denne metode \"ret gode resultater\" med en detektionsn\u00f8jagtighed p\u00e5 over 90%. Brissaud p\u00e5pegede dog, at der ville v\u00e6re behov for flere data for at fastsl\u00e5 systemets p\u00e5lidelighed for forskellige typer tsunamier.\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Quentin Brissaud bem\u00e6rker, at \"sj\u00e6ldenheden af store tsunamier g\u00f8r det udfordrende at analysere og forudsige s\u00e5danne begivenheder.\"<\/span><\/p>\n<p><span style=\"font-weight: 400;\">En af udfordringerne ved at implementere et globalt tsunamivarslingssystem er behovet for international datadeling. Som Constantinou n\u00e6vner: \"Data ligger ofte hos regeringer eller kommercielle partnere, der driver satellitterne. Der er ikke \u00e9t sted, hvor man kan hente data til et globalt system.\"<\/span><\/p>\n<h2><span style=\"font-weight: 400;\">Mere om unders\u00f8gelsen<\/span><\/h2>\n<p><span style=\"font-weight: 400;\">Denne <\/span><a href=\"https:\/\/arxiv.org\/pdf\/2308.04611.pdf\"><span style=\"font-weight: 400;\">unders\u00f8gelse<\/span><\/a><span style=\"font-weight: 400;\"> kombinerer satellitdata med maskinl\u00e6ring (ML) for at analysere \u00e6ndringer i jordens atmosf\u00e6re udl\u00f8st af tsunamier.\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Selv om der er sket fremskridt inden for tsunami-detektion p\u00e5 det seneste, har mange kyststr\u00e6kninger stadig utilstr\u00e6kkelig d\u00e6kning fra tidlige varslingssystemer.\u00a0<\/span><\/p>\n<p>S\u00e5dan her fungerer det:<\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Forskere har udviklet en AI-baseret ramme til at identificere tidlige tegn p\u00e5 tsunamier ved at overv\u00e5ge rejsende ionosf\u00e6riske forstyrrelser (TID'er) i jordens ionosf\u00e6re. Disse forstyrrelser p\u00e5virker det samlede elektronindhold (TEC), som kan registreres via det globale navigationssatellitsystem (GNSS).<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Denne tilgang udnytter data fra flere satellitsystemer som GPS, Galileo, GLONASS og BeiDou. Det giver d\u00e6kning i realtid p\u00e5 \u00e5bent hav og fungerer som et v\u00e6rdifuldt supplement til geografiske omr\u00e5der, der ikke er tilg\u00e6ngelige for traditionelle b\u00f8jebaserede advarselssystemer.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">AI-modellen bruger Convolutional Neural Networks (CNN), der er tr\u00e6net p\u00e5 historiske data fra tsunamierne i Maule i 2010, Tohoku i 2011 og Haida-Gwaii i 2012. Den blev senere valideret med data fra Illapel-tsunamien i 2015 og opn\u00e5ede en n\u00f8jagtighedsscore p\u00e5 91,7%.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Systemet anvender en FPM-strategi (False Positive Mitigation), som reducerer antallet af falske alarmer betydeligt.<\/span><\/li>\n<\/ul>\n<p>Mange AI-systemer anvendes til at forudsige milj\u00f8katastrofer, herunder <a href=\"https:\/\/dailyai.com\/da\/2023\/08\/googles-ai-flood-detection-system-predicts-floods-four-days-in-advance\/\">Googles oversv\u00f8mmelsescenter<\/a>som for nylig blev udvidet til at d\u00e6kke flere regioner.<\/p>","protected":false},"excerpt":{"rendered":"<p>Forskere brugte kunstig intelligens til at identificere \u00e6ndringer i Jordens atmosf\u00e6re, som opst\u00e5r, n\u00e5r tsunamib\u00f8lger begynder at dannes i havet.  Det kan forl\u00e6nge advarselstiden betydeligt for kystsamfund, der er i fare for at blive ramt af tsunamier. Valentino Constantinou fra Terran Orbital Corporation i Florida forklarer: \"Der findes ikke noget globalt netv\u00e6rk til at opdage tsunamib\u00f8lger, og det er dyrt at installere fysisk hardware, som f.eks. b\u00f8jebaserede systemer. Men vi ved, at sm\u00e5 satellitkonstellationer spreder sig overalt.\" Hastigheden af de signaler, der produceres af jordsk\u00e6lv p\u00e5 havet, p\u00e5virkes af t\u00e6theden af ladede partikler i jordens ionosf\u00e6re, som befinder sig omkring 300 til 350 kilometer over overfladen.<\/p>","protected":false},"author":2,"featured_media":4636,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[84],"tags":[337,105],"class_list":["post-4635","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-industry","tag-climate-science","tag-machine-learning"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Researchers harness satellite data to create accurate tsunami warning system | DailyAI<\/title>\n<meta name=\"description\" content=\"Researchers have proven that AI can identify 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