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Videogrammetric monitoring of as-built membrane roof structures / S.Y. Lin in Photogrammetric record, vol 23 n° 122 (June - August 2008)  

Public [article]  inPhotogrammetric record > vol 23 n° 122 (June - August 2008) . - pp 128 - 147 Titre : Videogrammetric monitoring of as-built membrane roof structures Type de document : Article/Communication Auteurs : S.Y. Lin, Auteur ; Jon Mills, Auteur ; P.D. Gosling, Auteur Année de publication : 2008 Article en page(s) : pp 128 - 147 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Traitement d'image [Termes IGN] balise [Termes IGN] déformation de surface [Termes IGN] données localisées 3D [Termes IGN] modèle numérique de surface [Termes IGN] surveillance d'ouvrage [Termes IGN] toit [Termes IGN] Vidéogrammétrie Résumé : (Auteur) A monitoring system that uses applied geomatics techniques, including videogrammetry and terrestrial laser scanning, has been developed in order to investigate the dynamic behaviour of as-built membrane roof structures. To accommodate the problems involved in measuring such roof structures, examples of which include uniform surface texture and unreachable height, the system adopts a non-contact targeting methodology to substitute for traditional control techniques. In-house software was developed for processing the acquired video imagery in order to produce a sequential surface model of the membrane. This paper firstly reports on experiments conducted to demonstrate that the monitoring system was capable of measuring representative test structures with a precision of better than +1 mm. To prove the feasibility and transferability of the system, videogrammetric monitoring campaigns were subsequently performed at a real-world test site where two different types of membrane structure were observed. The sequential 3D surface models that were generated allowed the displacement of the membrane surfaces to be investigated over a period, during which the range of the movement reached over 20 mm. The information acquired from the system is proving to be of great value to structural engineers involved in research and development of such membrane structures. Copyright RS&PS + Blackwell Publishing Numéro de notice : A2008-294 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article DOI : 10.1111/j.1477-9730.2008.00477.x En ligne : https://doi.org/10.1111/j.1477-9730.2008.00477.x Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=29287 [article]

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Accuracy assessment of Lidar-derived digital elevation models / F. Aguilar in Photogrammetric record, vol 23 n° 122 (June - August 2008)  

Public [article]  inPhotogrammetric record > vol 23 n° 122 (June - August 2008) . - pp 148 - 169 Titre : Accuracy assessment of Lidar-derived digital elevation models Type de document : Article/Communication Auteurs : F. Aguilar, Auteur ; Jon P. Mills, Auteur Année de publication : 2008 Article en page(s) : pp 148 - 169 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Lasergrammétrie [Termes IGN] analyse comparative [Termes IGN] données lidar [Termes IGN] erreur de mesure [Termes IGN] lasergrammétrie [Termes IGN] méthode de Monte-Carlo [Termes IGN] modèle numérique de surface [Termes IGN] positionnement cinématique [Termes IGN] positionnement par GPS [Termes IGN] précision des mesures Résumé : (Auteur) Despite the relatively high cost of airborne lidar-derived digital elevation models (DEMs), such products are usually presented without a satisfactory associated estimate of accuracy. For the most part, DEM accuracy estimates are typically provided by comparing lidar heights against a finite sample of check point coordinates from an independent source of higher accuracy, supposing a normal distribution of the derived height differences or errors. This paper proposes a new methodology to assess the vertical accuracy of lidar DEMs using confidence intervals constructed from a finite sample of errors computed at check points. A non-parametric approach has been tested where no particular error distribution is assumed, making the proposed methodology especially applicable to non-normal error distributions of the type usually found in DEMs derived from lidar. The performance of the proposed model was experimentally validated using Monte Carlo simulation on 18 vertical error data-sets. Fifteen of these data-sets were computed from original lidar data provided by the International Society for Photogrammetry and Remote Sensing Working Group III/3, using their respective filtered reference data as ground truth. The three remaining data-sets were provided by the Natural Environment Research Council's Airborne Research and Survey Facility lidar system, together with check points acquired using high precision kinematic GPS. The results proved promising, the proposed models reproducing the statistical behaviour of vertical errors of lidar using a favourable number of check points, even in the cases of data-sets with non-normally distributed residuals. This research can therefore be considered as a potentially important step towards improving the quality control of lidar-derived DEMs. Copyright RS&PS + Blackwell Publishing Numéro de notice : A2008-295 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article DOI : 10.1111/j.1477-9730.2008.00476.x En ligne : https://doi.org/10.1111/j.1477-9730.2008.00476.x Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=29288 [article]

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A model-based approach for reconstructing a terrain surface from airborne Lidar data / Gunho Sohn in Photogrammetric record, vol 23 n° 122 (June - August 2008)  

Public [article]  inPhotogrammetric record > vol 23 n° 122 (June - August 2008) . - pp 170 - 193 Titre : A model-based approach for reconstructing a terrain surface from airborne Lidar data Type de document : Article/Communication Auteurs : Gunho Sohn, Auteur ; Ian J. Dowman, Auteur Année de publication : 2008 Article en page(s) : pp 170 - 193 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Lasergrammétrie [Termes IGN] données lidar [Termes IGN] filtrage de points [Termes IGN] modèle numérique de surface [Termes IGN] optimisation (mathématiques) [Termes IGN] pente [Termes IGN] semis de points Résumé : (Auteur) A lidar filtering technique is used to differentiate on-terrain points and off-terrain points from a cloud of 3D point data collected by a lidar system. A major issue of concern in this low-level filter is to design a methodology to ensure a continual adaptation to variations of terrain slopes and object scales. In this paper, a new lidar filtering technique which hierarchically fragments lidar data into piecewise planar terrain models is introduced. Once a number of hypothetical planar terrain models are generated to fit the terrain surface of the underlying area, the optimal terrain model to produce the minimum labelling errors is determined based on minimum description length (MDL) principles. This hypothesis-verification optimisation is achieved in a coarse-to-fine strategy by which the entire terrain surface is incrementally reconstructed by increasing the number of planar terrain models fitted. The proposed technique was successfully applied to a digital surface model provided within an OEEPE lidar trial, showing 0·94% of Type I errors and 6·75% of Type II errors compared to manually classified reference data. Copyright RS&PS + Blackwell Publishing Numéro de notice : A2008-296 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article DOI : 10.1111/j.1477-9730.2008.00483.x En ligne : https://doi.org/10.1111/j.1477-9730.2008.00483.x Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=29289 [article]

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From 2D to 3D through modelling based on a single image / Diego Gonzalez-Aguilera in Photogrammetric record, vol 23 n° 122 (June - August 2008)  

Public [article]  inPhotogrammetric record > vol 23 n° 122 (June - August 2008) . - pp 208 - 227 Titre : From 2D to 3D through modelling based on a single image Type de document : Article/Communication Auteurs : Diego Gonzalez-Aguilera, Auteur ; J. Gomez-Lahoz, Auteur Année de publication : 2008 Article en page(s) : pp 208 - 227 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Photogrammétrie numérique [Termes IGN] auto-étalonnage [Termes IGN] données localisées 3D [Termes IGN] extraction de traits caractéristiques [Termes IGN] image isolée [Termes IGN] modélisation 3D [Termes IGN] patrimoine culturel [Termes IGN] photogrammétrie métrologique [Termes IGN] point de fuite [Termes IGN] reconstruction 3D Résumé : (Auteur) Three-dimensional modelling from single images remains an interesting topic of investigation in the research community, even though range sensors are becoming a common alternative for the generation of 3D information. The interest in single-image-based modelling is motivated by a wide spectrum of applications such as cultural heritage, civil engineering, urban planning and even criminology. In this paper a complete new production flowline is presented for modelling based on a single image. The modelling process consists of a series of familiar steps in photogrammetry and computer vision: feature extraction, vanishing point computation, camera self-calibration, 3D reconstruction and dimensional analysis. In particular, the methodology developed for single-image-based modelling takes a scientific approach combining several proven techniques with robust estimators. Finally, in order to demonstrate its capabilities, the reported examples include several real situations applied in different contexts. Copyright RS&PS + Blackwell Publishing Numéro de notice : A2008-297 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article DOI : 10.1111/j.1477-9730.2008.00482.x En ligne : https://doi.org/10.1111/j.1477-9730.2008.00482.x Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=29290 [article]

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A combined single range and single image device for low-cost measurement of building façade features / C. Ordonez in Photogrammetric record, vol 23 n° 122 (June - August 2008)  

Public [article]  inPhotogrammetric record > vol 23 n° 122 (June - August 2008) . - pp 228 - 240 Titre : A combined single range and single image device for low-cost measurement of building façade features Type de document : Article/Communication Auteurs : C. Ordonez, Auteur ; Pedro Arias, Auteur ; J. Herraez, Auteur ; et al., Auteur Année de publication : 2008 Article en page(s) : pp 228 - 240 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Traitement d'image [Termes IGN] bâtiment [Termes IGN] image isolée [Termes IGN] photogrammétrie terrestre [Termes IGN] télémétrie laser terrestre Résumé : (Auteur) The dimensions of building façades and window apertures are usually determined by making direct measurements using tapes and plummets. This approach, however, has a number of drawbacks including the physical risk to which the persons making the measurements are exposed. This paper proposes an indirect approach based on close range photogrammetry that is inexpensive, simple, fast and safe, and which does not require specialist staff or direct ground control measurements. The method is based on taking a picture using a digital camera and measuring the distance to the object using a handheld laser distance meter. Both items of equipment are mounted on a specially designed support that allows the laser distance meter to move independently of the camera. Copyright RS&PS + Blackwell Publishing Numéro de notice : A2008-298 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article DOI : 10.1111/j.1477-9730.2008.00478.x En ligne : https://doi.org/10.1111/j.1477-9730.2008.00478.x Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=29291 [article]

Exemplaires(1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
106-08021	RAB	Revue	Centre de documentation	En réserve L003	Disponible