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Very large scale aerial photography for rangeland monitoring / D.T. Booth in Geocarto international, vol 21 n° 3 (September - November 2006)  

Public [article]  inGeocarto international > vol 21 n° 3 (September - November 2006) . - pp 27 - 34 Titre : Very large scale aerial photography for rangeland monitoring Type de document : Article/Communication Auteurs : D.T. Booth, Auteur ; S.E. Cox, Auteur Année de publication : 2006 Article en page(s) : pp 27 - 34 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Acquisition d'image(s) et de donnée(s) [Termes IGN] altimètre laser [Termes IGN] caméra numérique [Termes IGN] capteur aérien [Termes IGN] détecteur CMOS [Termes IGN] pas d'échantillonnage au sol [Termes IGN] photographie à grande échelle [Termes IGN] photographie aérienne [Termes IGN] récepteur GPS [Termes IGN] surveillance de la végétation [Termes IGN] Wyoming (Etats-Unis) Résumé : (Auteur) Ecological assessment of ground cover by conventional on-the-ground point sampling is labor intensive, expensive, and biased by access. Historically, motion blur has prevented high-resolution aerial photography from being used for ground cover measurements. To reduce motion blur we used a fixed-wing, 225-kg (empty weight) airplane flown at 72 km/hr ground speed 100 in above ground level with both a modified Hulcher 70 mm camera (500mm lens, Kodak Aerocolor HS SO-846 film, 1/4,000-second shutter speed), and a Canon 11. 1 mega-pixel, automatic, digital single lens reflex, color camera (420 mm focal-length lens). The resulting very-large scale aerial (VLSA) photography had resolutions of 5.0 and 2.1 mm GSD (Ground Sample Distance) for the scanned film and digital-camera images, respectively. Motion blur was minimal. The cost for obtaining 450 VLSA photographs over a 70,800-ha watershed was $0.07 ha. We found our methods well adapted for extensive aerial surveys to monitor the ecological condition of rangeland watersheds. Copyright Geocarto international Numéro de notice : A2006-477 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1080/10106040608542390 Date de publication en ligne : 04/01/2008 En ligne : https://doi.org/10.1080/10106040608542390 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=28201 [article]

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