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DEM measurements of a gravel-bed surface using two scales of images / Chi-Kuei Wang in Photogrammetric record, vol 30 n° 152 (December 2015 - February 2016)  

Public [article]  inPhotogrammetric record > vol 30 n° 152 (December 2015 - February 2016) . - pp 387 - 401 Titre : DEM measurements of a gravel-bed surface using two scales of images Type de document : Article/Communication Auteurs : Chi-Kuei Wang, Auteur ; Jui-Teng Chung, Auteur ; Yu-Li Lin, Auteur Année de publication : 2015 Article en page(s) : pp 387 - 401 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications photogrammétriques [Termes IGN] gravier [Termes IGN] limite de résolution géométrique [Termes IGN] lit [Termes IGN] modèle numérique de surface [Termes IGN] photogrammétrie terrestre [Termes IGN] rivière [Termes IGN] Taïwan Résumé : (auteur) Determining the geometry of an exposed gravel-bed surface is important in understanding river flow characteristics. This study presents a method of generating a digital elevation model (DEM) of exposed gravel-bed surfaces using two different scales of images of a riverine environment. The small scale DEM covers an area of 4·5 m × 4·5 m and serves as the reference base, whereas several large scale DEMs provide highly detailed elevation information along the site diagonals. The equipment includes a consumer-grade camera and is light and easy to set up in the field. Highly automated procedures using several off-the-shelf packages ease the burden of generating DEMs of the gravel-bed surface, reducing the technological obstacles for other disciplines. This study evaluates the accuracy of the proposed method at three study sites with different grain sizes along the Hou-Jue River in southern Taiwan. The elevation accuracy obtained by the proposed method was validated by a total station and achieved a root mean square error of 2·9 to 4·3 mm. Numéro de notice : A2015-828 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article DOI : 10.1111/phor.12125 Date de publication en ligne : 15/12/2015 En ligne : https://doi.org/10.1111/phor.12125 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=79124 [article]

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