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Coarse orientation of terrestrial laser scans in urban environments / Claus Brenner in ISPRS Journal of photogrammetry and remote sensing, vol 63 n° 1 (January - February 2008)  

Public [article]  inISPRS Journal of photogrammetry and remote sensing > vol 63 n° 1 (January - February 2008) . - pp 4 - 18 Titre : Coarse orientation of terrestrial laser scans in urban environments Type de document : Article/Communication Auteurs : Claus Brenner, Auteur ; C. Dold, Auteur ; N. Ripperda, Auteur Année de publication : 2008 Article en page(s) : pp 4 - 18 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Acquisition d'image(s) et de donnée(s) [Termes IGN] analyse comparative [Termes IGN] milieu urbain [Termes IGN] orientation du capteur [Termes IGN] système de référence géodésique [Termes IGN] télémètre laser terrestre [Termes IGN] test de performance Résumé : (Auteur) The use of terrestrial laser scanners is becoming increasingly popular. For the acquisition of larger scenes, it is usually necessary to align all scans to a common reference frame. While there are methods using direct measurement of the orientation, due to simplicity and costs, mostly artificial targets are used. This works reliably, but usually adds a substantial amount of time to the acquisition process. Methods to align scans using the scan data itself have been known for a long time, however, being iterative, they need good initial values. In this paper, we investigate two different methods targeted at the determination of suitable initial values. The first one is based on a symbolic approach, using corresponding features to compute the orientation. The second one is based on an iterative alignment scheme originally proposed in the robotics domain. To assess the performance of both methods, a set of 20 scans has been acquired systematically along a trajectory in a downtown area. Reference orientations were obtained by a standard procedure using artificial targets. We present the results of both methods regarding convergence and accuracy, and compare their performance. Copyright ISPRS Numéro de notice : A2008-038 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1016/j.isprsjprs.2007.05.002 En ligne : https://doi.org/10.1016/j.isprsjprs.2007.05.002 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=29033 [article]

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A method for automated registration of unorganised point clouds / K. Bae in ISPRS Journal of photogrammetry and remote sensing, vol 63 n° 1 (January - February 2008)  

Public [article]  inISPRS Journal of photogrammetry and remote sensing > vol 63 n° 1 (January - February 2008) . - pp 36 - 54 Titre : A method for automated registration of unorganised point clouds Type de document : Article/Communication Auteurs : K. Bae, Auteur ; Derek D. Lichti, Auteur Année de publication : 2008 Article en page(s) : pp 36 - 54 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Acquisition d'image(s) et de donnée(s) [Termes IGN] données laser [Termes IGN] lasergrammétrie [Termes IGN] primitive géométrique [Termes IGN] semis de points [Termes IGN] surveillance d'ouvrage [Termes IGN] télémétrie laser terrestre Résumé : (Auteur) A registration method for unorganised point cloud datasets, the Geometric Primitive ICP with the RANSAC (GP-ICPR), which uses geometric primitives, neighbourhood search and the positional uncertainty of laser scanners is proposed. The change of geometric curvature and approximate normal vector of the surface formed by a point and its neighbourhood are used to search for possible corresponding points. The GP-ICPR was tested with terrestrial laser scanner datasets in terms of its precision and accuracy. It is shown that the GP-ICPR improved the precision of the estimated relative transformation parameters by as much as a factor of 5, which provides a window of opportunity to utilise this automated registration method in practical applications such as terrestrial surveying and deformation monitoring. Copyright ISPRS Numéro de notice : A2008-039 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1016/j.isprsjprs.2007.05.012 En ligne : https://doi.org/10.1016/j.isprsjprs.2007.05.012 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=29034 [article]

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CAMPINO, a skeletonization method for point cloud processing / Alexander Bucksch in ISPRS Journal of photogrammetry and remote sensing, vol 63 n° 1 (January - February 2008)  

Public [article]  inISPRS Journal of photogrammetry and remote sensing > vol 63 n° 1 (January - February 2008) . - pp 115 - 127 Titre : CAMPINO, a skeletonization method for point cloud processing Type de document : Article/Communication Auteurs : Alexander Bucksch, Auteur ; R. Linderberg, Auteur Année de publication : 2008 Article en page(s) : pp 115 - 127 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Traitement d'image [Termes IGN] balayage laser [Termes IGN] segmentation d'image [Termes IGN] semis de points [Termes IGN] squelettisation [Termes IGN] télémètre laser terrestre [Termes IGN] traitement géométrique de données [Termes IGN] végétation Résumé : (Auteur) A new algorithm for deriving skeletons and segmentations from point cloud data in O(n) time is explained in this publication. This skeleton is represented as a graph, which can be embedded into the point cloud. The CAMPINO method, (C)ollapsing (A)nd (M)erging (P)rocedures (IN) (O)ctree-graphs, is based on cycle elimination in a graph as derived from an octree based space division procedure. The algorithm is able to extract the skeleton from point clouds generated from either one or multiple viewpoints. The correspondence between the vertices of the graph and the original points of the point cloud is used to derive an initial segmentation of these points. The principle of the algorithm is demonstrated on a synthetic point cloud consisting of 3 connected tori. Initially this algorithm was developed to obtain skeletons from point clouds representing natural trees, measured with the terrestrial laser scanner IMAGER 5003 of Zoller+Fröhlich. The results show that CAMPINO is able to automatically derive realistic skeletons that fit the original point cloud well and are suited as a basis for e.g. further automatic feature extraction or skeleton-based registration. Copyright ISPRS Numéro de notice : A2008-040 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1016/j.isprsjprs.2007.10.004 En ligne : https://doi.org/10.1016/j.isprsjprs.2007.10.004 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=29035 [article]

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Geometric validation of a ground-based mobile laser scanning system / D. Barber in ISPRS Journal of photogrammetry and remote sensing, vol 63 n° 1 (January - February 2008)  

Public [article]  inISPRS Journal of photogrammetry and remote sensing > vol 63 n° 1 (January - February 2008) . - pp 128 - 141 Titre : Geometric validation of a ground-based mobile laser scanning system Type de document : Article/Communication Auteurs : D. Barber, Auteur ; Jon Mills, Auteur ; S. Smith-Voysey, Auteur Année de publication : 2008 Article en page(s) : pp 128 - 141 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Topographie [Termes IGN] données laser [Termes IGN] données localisées 3D [Termes IGN] lasergrammétrie [Termes IGN] lever topographique [Termes IGN] milieu urbain [Termes IGN] outil d'aide à la décision [Termes IGN] précision des données [Termes IGN] semis de points [Termes IGN] système de numérisation mobile [Termes IGN] validité des données Résumé : (Auteur) This paper outlines a study, carried out on behalf of a national mapping agency, to validate laser scanned point cloud data collected by a ground-based mobile mapping system. As the need for detailed three-dimensional data about our environment continues to grow, ground-based mobile systems are likely to find an increasingly important niche in national mapping agency applications. For example, such systems potentially provide the most efficient data capture for numerical modelling and/or visualisation in support of decision making, filling a void between static terrestrial and mobile airborne laser scanning. This study sought to assess the precision and accuracy of data collected using the StreetMapper system across two test sites: a peri-urban residential housing estate with low density housing and wide streets, and a former industrial area consisting of narrow streets and tall warehouses. An estimate of system precision in both test sites was made using repeated data collection passes, indicating a measurement precision (95%) of between 0.029 m and 0.031 m had been achieved in elevation. Elevation measurement accuracy was assessed against check points collected using conventional surveying techniques at the same time as the laser scanning survey, finding RMS errors in elevation in the order of 0.03 m. Planimetric accuracy was also assessed, with results indicating an accuracy of approximately 0.10 m, although difficulties in reliably assessing planimetric accuracy were encountered. The results of this validation were compared against a theoretical error pre-analysis which was also used to show the relative components of error within the system. Finally, recommendations for future validation methodologies are outlined and possible applications of the system are briefly discussed. Copyright ISPRS Numéro de notice : A2008-041 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1016/j.isprsjprs.2007.07.005 En ligne : https://doi.org/10.1016/j.isprsjprs.2007.07.005 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=29036 [article]

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