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Building boundary tracing and regularization from airborne lidar point clouds / A. Sampath in Photogrammetric Engineering & Remote Sensing, PERS, vol 73 n° 7 (July 2007)
[article]
Titre : Building boundary tracing and regularization from airborne lidar point clouds Type de document : Article/Communication Auteurs : A. Sampath, Auteur ; J. Shan, Auteur Année de publication : 2007 Article en page(s) : pp 805 - 812 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Lasergrammétrie
[Termes IGN] correction géométrique
[Termes IGN] détection du bâti
[Termes IGN] données lidar
[Termes IGN] lasergrammétrie
[Termes IGN] lissage de données
[Termes IGN] Maryland (Etats-Unis)
[Termes IGN] reconstruction 3D du bâti
[Termes IGN] segmentation
[Termes IGN] semis de points
[Termes IGN] TorontoRésumé : (Auteur) Building boundary is necessary for the real estate industry, flood management, and homeland security applications. The extraction of building boundary is also a crucial and difficult step towards generating city models. This study presents an approach to the tracing and regularization of building boundary from raw lidar point clouds. The process consists of a sequence of four steps: separate building and non-building lidar points; segment lidar points that belong to the same building; trace building boundary points; and regularize the boundary. For separation, a slope based 1D bi-directional filter is used. The segmentation step is a region-growing approach. By modifying a convex hull formation algorithm, the building boundary points are traced and connected to form an approximate boundary. In the final step, all boundary points are included in a hierarchical least squares solution with perpendicularity constraints to determine a regularized rectilinear boundary. Our tests conclude that the uncertainty of regularized building boundary tends to be linearly proportional to the lidar point spacing. It is shown that the regularization precision is at 18 percent to 21 percent of the lidar point spacing, and the maximum offset of the determined building boundary from the original lidar points is about the same as the lidar point spacing. Limitation of lidar data resolution and errors in previous filtering processes may cause artefacts in the final regularized building boundary. This paper presents the mathematical and algorithmic formulations along with stepwise illustrations. Results from Baltimore city, Toronto city, and Purdue University campus are evaluated. Copyright ASPRS Numéro de notice : A2007-314 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article DOI : 10.14358/PERS.73.7.805 En ligne : http://dx.doi.org/10.14358/PERS.73.7.805 Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=28677
in Photogrammetric Engineering & Remote Sensing, PERS > vol 73 n° 7 (July 2007) . - pp 805 - 812[article]Impact of lidar nominal post-spacing on DEM accuracy and flood zone delineation / G.T. Raber in Photogrammetric Engineering & Remote Sensing, PERS, vol 73 n° 7 (July 2007)
[article]
Titre : Impact of lidar nominal post-spacing on DEM accuracy and flood zone delineation Type de document : Article/Communication Auteurs : G.T. Raber, Auteur ; J.R. Jensen, Auteur Année de publication : 2007 Article en page(s) : pp 793 - 804 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Photogrammétrie numérique
[Termes IGN] données lidar
[Termes IGN] inondation
[Termes IGN] lasergrammétrie
[Termes IGN] modèle hydrographique
[Termes IGN] modèle numérique de terrain
[Termes IGN] plan de vol
[Termes IGN] précision des données
[Termes IGN] précision du positionnement
[Termes IGN] prise de vue aérienne
[Termes IGN] réseau hydrographique
[Termes IGN] semis de pointsRésumé : (Auteur) Lidar data have become a major source of digital terrain information for use in many applications including hydraulic modeling and flood plane mapping. Based on established relationships between sampling intensity and error, nominal post-spacing likely contributes significantly to the error budget. Post-spacing is also a major cost factor during lidar data collection. This research presents methods for establishing a relationship between nominal post-spacing and its effects on hydraulic modeling for flood zone delineation. Lidar data collected at a low post-spacing (approximately 1 to 2 m) over a piedmont study area in North Carolina was systematically decimated to simulate datasets with sequentially higher post-spacing values. Using extensive first-order ground survey information, the accuracy of each DEM derived from these lidar datasets was assessed and reported. Hydraulic analyses were performed utilizing standard engineering practices and modeling software (HEC-RAS). All input variables were held constant in each model run except for the topographic information from the decimated lidar datasets. The results were compared to a hydraulic analysis performed on the un-decimated reference dataset. The sensitivity of the primary model outputs to the variation in nominal post-spacing is reported. The results indicate that base flood elevation does not statistically change over the post-spacing values tested. Conversely, flood zone boundary mapping was found to be sensitive to variations in post-spacing. Copyright ASPRS Numéro de notice : A2007-313 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article DOI : 10.14358/PERS.73.7.793 En ligne : http://dx.doi.org/10.14358/PERS.73.7.793 Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=28676
in Photogrammetric Engineering & Remote Sensing, PERS > vol 73 n° 7 (July 2007) . - pp 793 - 804[article]Interpretation and generalization of 3D landscape from lidar data / S. Filin in Cartography and Geographic Information Science, vol 34 n° 3 (July 2007)
[article]
Titre : Interpretation and generalization of 3D landscape from lidar data Type de document : Article/Communication Auteurs : S. Filin, Auteur ; N.A. Akel, Auteur ; K. Kemeike, Auteur ; et al., Auteur Année de publication : 2007 Article en page(s) : pp 231 - 243 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Termes IGN] données lidar
[Termes IGN] données localisées 3D
[Termes IGN] extraction du réseau routier
[Termes IGN] généralisation cartographique automatisée
[Termes IGN] interprétation automatique
[Termes IGN] lasergrammétrie
[Termes IGN] placement automatique des objets
[Termes IGN] réseau routier
[Termes IGN] semis de points
[Termes IGN] visualisation 3D
[Vedettes matières IGN] GénéralisationRésumé : (Auteur) This paper discusses the interpretation and generalization of three-dimensional landscapes derived from laser scanning data. Airborne laser scanning systems provide an unparalleled detailed description of surfaces on a large scale. This level of detail, however, raises questions regarding the effective visual communication of the data. In this paper, we consider visualization from a cartographic perspective, particularly in terms of the generalization of details and enhancement of important features. Our goal is to visualize topography efficiently, while emphasizing such features as the road network. To achieve this, the communication of 3D landscapes has been implemented as a modular pipeline of individual, configurable processes, focusing on the interpretation of the laser dataset and its generalization. The raw laser point-cloud then becomes an input to a sequence of processes that result in a generalized topography. The interpretation process concerns the extraction of the terrain and the road network from the raw data. The generalization of the interpreted entities then follows. The application of the proposed model shows improved manifestation of the road network within the terrain. Copyright CaGISociety Numéro de notice : A2007-395 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE/INFORMATIQUE Nature : Article DOI : 10.1559/152304007781697857 En ligne : https://doi.org/10.1559/152304007781697857 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=28758
in Cartography and Geographic Information Science > vol 34 n° 3 (July 2007) . - pp 231 - 243[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 032-07031 RAB Revue Centre de documentation En réserve L003 Disponible Scanning Yemen's great mosques / A. Vlasaty in Technology & more, vol 2007 n° 2 (01/07/2007)
[article]
Titre : Scanning Yemen's great mosques Type de document : Article/Communication Auteurs : A. Vlasaty, Directeur de publication Année de publication : 2007 Article en page(s) : pp 2 - 4 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Lasergrammétrie
[Termes IGN] instrumentation Trimble
[Termes IGN] lasergrammétrie
[Termes IGN] mosquée
[Termes IGN] restitution
[Termes IGN] télémétrie laser terrestre
[Termes IGN] YémenRésumé : (Documentaliste) Cet article présente la mission réalisée par l'ENSG, de levers photogrammétriques de l'intérieur de la mosquée Al-Abbas. Numéro de notice : A2007-285 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=28648
in Technology & more > vol 2007 n° 2 (01/07/2007) . - pp 2 - 4[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 260-07021 RAB Revue Centre de documentation En réserve L003 Disponible Building detection by fusion of airborne laser scanner data and multi-spectral images: performance evaluation and sensitivity analysis / Franz Rottensteiner in ISPRS Journal of photogrammetry and remote sensing, vol 62 n° 2 (June 2007)
[article]
Titre : Building detection by fusion of airborne laser scanner data and multi-spectral images: performance evaluation and sensitivity analysis Type de document : Article/Communication Auteurs : Franz Rottensteiner, Auteur ; John C. Trinder, Auteur ; S. Clode, Auteur ; K. Kubik, Auteur Année de publication : 2007 Article en page(s) : pp 135 - 149 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications photogrammétriques
[Termes IGN] analyse de sensibilité
[Termes IGN] classification de Dempster-Shafer
[Termes IGN] détection du bâti
[Termes IGN] données lidar
[Termes IGN] fusion de données multisource
[Termes IGN] image multibande
[Termes IGN] lasergrammétrie
[Termes IGN] test de performanceRésumé : (Auteur) In this paper, we describe the evaluation of a method for building detection by the Dempster–Shafer fusion of airborne laser scanner (ALS) data and multi-spectral images. For this purpose, ground truth was digitised for two test sites with quite different characteristics. Using these data sets, the heuristic models for the probability mass assignments are validated and improved, and rules for tuning the parameters are discussed. The sensitivity of the results to the most important control parameters of the method is assessed. Further we evaluate the contributions of the individual cues used in the classification process to determine the quality of the results. Applying our method with a standard set of parameters on two different ALS data sets with a spacing of about 1 point/m2, 95% of all buildings larger than 70 m2 could be detected and 95% of all detected buildings larger than 70 m2 were correct in both cases. Buildings smaller than 30 m2 could not be detected. The parameters used in the method have to be appropriately defined, but all except one (which must be determined in a training phase) can be determined from meaningful physical entities. Our research also shows that adding the multi-spectral images to the classification process improves the correctness of the results for small residential buildings by up to 20%. Copyright ISPRS Numéro de notice : A2007-261 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1016/j.isprsjprs.2007.03.001 En ligne : https://doi.org/10.1016/j.isprsjprs.2007.03.001 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=28624
in ISPRS Journal of photogrammetry and remote sensing > vol 62 n° 2 (June 2007) . - pp 135 - 149[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 081-07041 SL Revue Centre de documentation Revues en salle Disponible A concept for feature based data registration by simultaneous consideration of laser scanner data and photogrammetric images / A. Wendt in ISPRS Journal of photogrammetry and remote sensing, vol 62 n° 2 (June 2007)PermalinkÉpaisseur d'eau minimale mesurable en rivière sur fronts d'ondes lidar simulés / A. Lesaignoux in Revue Française de Photogrammétrie et de Télédétection, n° 186 (Juin 2007)PermalinkLaser Scanning for change detection: safe and convenient use at ground level / G. Hunter in Geoinformatics, vol 10 n° 4 (01/06/2007)PermalinkMatching of 3D surfaces and their intensities / Devrim Akca in ISPRS Journal of photogrammetry and remote sensing, vol 62 n° 2 (June 2007)PermalinkObjectifs et méthodologie de cartographie 2D et 2.5D / Benjamin Sadier in Collection EDYTEM. cahiers de géographie, n° 5 (01/06/2007)PermalinkTraitement de données lidar aéroporté : vers une solution globale / Frédéric Bretar in Revue Française de Photogrammétrie et de Télédétection, n° 186 (Juin 2007)PermalinkVolume souterrain 3D et laserscanning / Stéphane Jaillet in Collection EDYTEM. cahiers de géographie, n° 5 (01/06/2007)PermalinkRepetitive interpolation: A robust algorithm for DTM generation from aerial Laser scanner data in forested terrain / A. Kobler in Remote sensing of environment, vol 108 n° 1 (15/05/2007)PermalinkDetection and vectorization of roads from lidar data / S. Clode in Photogrammetric Engineering & Remote Sensing, PERS, vol 73 n° 5 (May 2007)PermalinkUn avenir à écrire en trois dimensions / Michel Kasser in Géomètre, n° 2036 (avril 2007)Permalink