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Comparison of measurement techniques and static theory applied to concrete beam deformation / Petri Rönnholm in Photogrammetric record, vol 24 n° 128 (December 2009 - February 2010)  

Public [article]  inPhotogrammetric record > vol 24 n° 128 (December 2009 - February 2010) . - pp 351 - 371 Titre : Comparison of measurement techniques and static theory applied to concrete beam deformation Type de document : Article/Communication Auteurs : Petri Rönnholm, Auteur ; M. Nuikka, Auteur ; Antero Kukko, Auteur ; Harri Kaartinen, Auteur ; et al., Auteur Année de publication : 2009 Article en page(s) : pp 351 - 371 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Lasergrammétrie [Termes IGN] analyse comparative [Termes IGN] déformation d'édifice [Termes IGN] faisceau [Termes IGN] photogrammétrie terrestre [Termes IGN] positionnement en intérieur [Termes IGN] processus [Termes IGN] surveillance d'ouvrage [Termes IGN] tachéomètre électronique [Termes IGN] télémétrie laser sur satellite Résumé : (Auteur) In this paper, terrestrial laser scanning (TLS), photogrammetric and total station measurements were compared with dial gauge observations in two different loading experiments on a reinforced concrete beam. In the first test, the T-beam was stressed in several loading phases resulting in deformations of up to 13·63 mm. All measuring methods were able to detect deformations with an accuracy of better than 0·38 mm. The theoretical calculations of deflections based on a form of Euler–Bernoulli beam equation, however, underestimated the maximum bending of 4·08 mm. A similar loading experiment was applied on a rectangular concrete beam. In this case, the maximum deformation of the beam was 14·94 mm and measuring accuracies of all methods were better than 0·44 mm. The accuracy of theoretical calculations was better than 2·07 mm. The results indicate that laser scanning could be used as an alternative or complementary method to photogrammetric and total station measurements for detecting structural deformations in buildings. Copyright RS&PS + Blackwell Publishing Numéro de notice : A2009-497 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article DOI : 10.1111/j.1477-9730.2009.00548.x En ligne : https://doi.org/10.1111/j.1477-9730.2009.00548.x Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=30126 [article]

Exemplaires(1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
106-09041	RAB	Revue	Centre de documentation	En réserve L003	Disponible

The building shadow problem of airborne lidar / T.Y. Shih in Photogrammetric record, vol 24 n° 128 (December 2009 - February 2010)  

Public [article]  inPhotogrammetric record > vol 24 n° 128 (December 2009 - February 2010) . - pp 372 - 385 Titre : The building shadow problem of airborne lidar Type de document : Article/Communication Auteurs : T.Y. Shih, Auteur ; C. Huang, Auteur Année de publication : 2009 Article en page(s) : pp 372 - 385 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Lasergrammétrie [Termes IGN] champ visuel [Termes IGN] données lidar [Termes IGN] modèle numérique de surface [Termes IGN] ombre [Termes IGN] plan de vol [Termes IGN] semis de points [Termes IGN] télémétrie laser aéroporté Résumé : (Auteur) Airborne lidar systems are equipped with a scanning mechanism that produces a swath of 3D coordinated points to form a cloud in each flight strip. The scanning is perpendicular to the direction of flight. The density of the point cloud is one of the major quality measures for the data collected with such systems. Point density, shade (occlusion of the laser beam) and penetration rate are major factors to be considered in the flight design. For practical operations, flight missions may be designed with overlaps ranging from 5 to 50%. Aside from the percentage overlap, the field of view is another important parameter for flight design. An evaluation scheme to assess the percentage overlap between flight strips and the selection of the field of view is proposed in this study. The influences of overlap and field of view are also demonstrated with real data gathered by an airborne lidar system. Copyright RS&PS + Blackwell Publishing Numéro de notice : A2009-498 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article DOI : 10.1111/j.1477-9730.2009.00550.x En ligne : https://doi.org/10.1111/j.1477-9730.2009.00550.x Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=30127 [article]

Exemplaires(1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
106-09041	RAB	Revue	Centre de documentation	En réserve L003	Disponible