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Documentation Istanbul historic peninsula by kinematic terrestrial laser scanning / T. Kersten in Photogrammetric record, vol 24 n° 126 (June - August 2009)  

Public [article]  inPhotogrammetric record > vol 24 n° 126 (June - August 2009) . - pp 122 - 138 Titre : Documentation Istanbul historic peninsula by kinematic terrestrial laser scanning Type de document : Article/Communication Auteurs : T. Kersten, Auteur ; G. Buyuksalih, Auteur ; I. Baz, Auteur ; Karsten Jacobsen, Auteur Année de publication : 2009 Article en page(s) : pp 122 - 138 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Lasergrammétrie [Termes IGN] acquisition de données [Termes IGN] Istanbul (Turquie) [Termes IGN] lasergrammétrie [Termes IGN] lever mobile [Termes IGN] patrimoine immobilier [Termes IGN] reconstruction 3D du bâti [Termes IGN] site classé [Termes IGN] télémétrie laser terrestre Résumé : (Auteur) Although the Historic Peninsula of old Istanbul was added to the UNESCO World Heritage List in 1985, complete documentation of this important area has not yet been carried out. In 2006 the Istanbul Metropolitan Municipality's Historical Environment Protection Directorate initiated the "Historic Peninsula Project", which covers an area of 1500 ha and includes approximately 48 000 buildings in crowded and frequently narrow streets. BI.MTAS, a company owned by the Municipality, immediately started the documentation of all buildings in the project area using terrestrial laser scanning. This created the challenge of building up an efficient production environment with new high-end technology to fulfill the requirements of this project in a very short timeframe of 2 years. This paper describes the entire production environment for documentation of all buildings, detailing the frequent adaptations of the process resulting from learning on the job. Although the data acquisition and mapping environment was established in the course of production, it was always essential to optimise the technical solutions in order to meet the requirements for data quality and delivery deadlines. Only 80 ha of the required 1500 ha was completed using static scanning during the first 6 months, thus requiring a change from static to mobile terrestrial laser scanning in order to accelerate the work and to conclude the scanning phase for the remaining major area within 3 months. Copyright RS&PS + Blackwell Publishing Numéro de notice : A2009-206 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article DOI : 10.1111/j.1477-9730.2009.00528.x En ligne : https://doi.org/10.1111/j.1477-9730.2009.00528.x Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=29836 [article]

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Quality assessment for GPS-supported bundle block adjustment based on aerial digital frame imagery / X. Yuan in Photogrammetric record, vol 24 n° 126 (June - August 2009)  

Public [article]  inPhotogrammetric record > vol 24 n° 126 (June - August 2009) . - pp 139 - 156 Titre : Quality assessment for GPS-supported bundle block adjustment based on aerial digital frame imagery Type de document : Article/Communication Auteurs : X. Yuan, Auteur Année de publication : 2009 Article en page(s) : pp 139 - 156 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Photogrammétrie numérique [Termes IGN] aérotriangulation numérique [Termes IGN] bloc d'images [Termes IGN] compensation par bloc [Termes IGN] compensation par faisceaux [Termes IGN] coordonnées géographiques [Termes IGN] pas d'échantillonnage au sol [Termes IGN] point d'appui [Termes IGN] positionnement par GPS [Termes IGN] qualité géométrique (image) Résumé : (Auteur) Accuracy and reliability are two popular indicators for assessment of the quality of aerial triangulation. This paper explores these quality indicators in relation to GPS-supported bundle block adjustment based on aerial digital frame imagery with GPS navigation data. A set of aerial digital frame imagery, taken over hilly terrain using an SWDC-4 area-array digital camera made in China, was selected and used. These empirical images have superior resolution with a pixel size of 9 um, with a ground sample distance of 10 cm and larger than traditional overlaps (80% longitudinal and 63% lateral). GPS-supported bundle block adjustment was carried out with the WuCAPS high-precision combined bundle block adjustment software package developed by the author. The achieved a posteriori standard deviation (rms errors of observation residuals) of the image coordinates is +3·7 um. The empirical accuracy of the photogrammetric point coordinates reaches +7·1 cm for planimetry and +4·8 cm for elevation on the ground, and the average redundancies (average components of the redundancy for one kind of observation) of the image coordinates and the camera station coordinates determined via GPS are more than 0·74 and 0·69, respectively. These results have shown that GPS-supported aerial triangulation with aerial digital frame imagery provides higher precision and reliability; the practical height accuracy is close to its theoretical possibility; also, it avoids the use of the cross strips and lines of ground height control points on each side of the adjusted block. This not only changes the present situation, in which height accuracy is always lower than the planimetric accuracy in aerial triangulation of aerial film images, but also opens up a new prospect in which the orientation points for models for stereoplotting need not be determined by full field surveying for topographic mapping of reasonably flat terrain at medium and large scales. Therefore, this paper provides an operational basis for a broad range of applications for aerial digital imagery in national basic surveying and mapping, and the rapid production and updating of geographic information in general. Copyright RS&PS + Blackwell Publishing Numéro de notice : A2009-207 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article DOI : 10.1111/j.1477-9730.2009.00527.x En ligne : https://doi.org/10.1111/j.1477-9730.2009.00527.x Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=29837 [article]

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Testing the stereoscopic precision of a large-format digital camera / Benjamin Arias in Photogrammetric record, vol 24 n° 126 (June - August 2009)  

Public [article]  inPhotogrammetric record > vol 24 n° 126 (June - August 2009) . - pp 157 - 170 Titre : Testing the stereoscopic precision of a large-format digital camera Type de document : Article/Communication Auteurs : Benjamin Arias, Auteur ; J. Gomez-Lahoz, Auteur Année de publication : 2009 Article en page(s) : pp 157 - 170 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Photogrammétrie numérique [Termes IGN] analyse comparative [Termes IGN] caméra numérique [Termes IGN] chambre à grand format [Termes IGN] erreur systématique [Termes IGN] image aérienne [Termes IGN] précision stéréoscopique [Termes IGN] stéréoscopie Résumé : (Auteur) The use of large-format digital cameras in aerial photogrammetry is leading to great improvements in photogrammetric production. Since they were first introduced about 10 years ago, the technological community has been testing and investigating the conditions under which this major change can be consolidated. But a certain (and understandable) bias may be noticed in the efforts that developers, researchers and clients are undertaking. Almost all of the efforts aim at checking the quality of automated measurements and very little attention has been directed to stereoscopic measurements by human operators, which, nevertheless, still represent an important task that needs to be carried out in the production chain. This paper presents the results from a number of tests (13 operators from a variety of enterprises) performed to check the stereoscopic precision of Vexcel UltraCamD camera images compared with Leica RC30 film images. The main conclusion to be drawn from the empirical data is that stereoscopic precision does not depend on the type of camera. Copyright RS&PS + Blackwell Publishing Numéro de notice : A2009-208 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article DOI : 10.1111/j.1477-9730.2009.00530.x En ligne : https://doi.org/10.1111/j.1477-9730.2009.00530.x Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=29838 [article]

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A strip adjustment procedure to mitigate the impact of inaccurate mounting parameters in parallel Lidar strips / A.F. Habib in Photogrammetric record, vol 24 n° 126 (June - August 2009)  

Public [article]  inPhotogrammetric record > vol 24 n° 126 (June - August 2009) . - pp 171 - 195 Titre : A strip adjustment procedure to mitigate the impact of inaccurate mounting parameters in parallel Lidar strips Type de document : Article/Communication Auteurs : A.F. Habib, Auteur ; A. Kersting, Auteur ; K.I. Bang, Auteur ; et al., Auteur Année de publication : 2009 Article en page(s) : pp 171 - 195 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Lasergrammétrie [Termes IGN] compensation par bloc [Termes IGN] données lidar [Termes IGN] étalonnage géométrique [Termes IGN] GPS-INS [Termes IGN] objet géographique linéaire [Termes IGN] trajectographie par GPS Résumé : (Auteur) Lidar (laser scanning) technology has been proven as a prominent technique for the acquisition of high-density and accurate topographic information. Because of systematic errors in the lidar measurements (drifts in the position and orientation information and biases in the mirror angles and ranges) and/or in the parameters relating the system components (mounting parameters), adjacent lidar strips may exhibit discrepancies. Although position and orientation drifts can have a more significant impact, these errors and their impact do not come as a surprise if the quality of the GPS/INS integration process is carefully examined. Therefore, the mounting errors are singled out in this work. The ideal solution for improving the compatibility of neighbouring strips in the presence of errors in the mounting parameters is the implementation of a rigorous calibration procedure. However, such a calibration requires the original observations, which may not be usually available. In this paper, a strip adjustment procedure to improve the compatibility between parallel lidar strips with moderate flight dynamics (for example, acquired by a fixed-wing aircraft) over an area with moderately varying elevation is proposed. The proposed method is similar to the photogrammetric block adjustment of independent models. Instead of point features, planar patches and linear features, which are represented by sets of non-conjugate points, are used for the strip adjustment. The feasibility and the performance of the proposed procedure together with its impact on subsequent activities are illustrated using experimental results from real data. Copyright RS&PS + Blackwell Publishing Numéro de notice : A2009-209 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article DOI : 10.1111/j.1477-9730.2009.00529.x En ligne : https://doi.org/10.1111/j.1477-9730.2009.00529.x Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=29839 [article]

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