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Pathway detection and geometrical description from ALS data in forested mountaneous area / Nicolas David (2009)
contenu dans ISPRS Workshop Laserscanning'09, Paris, France, September 1-2, 2009 / Frédéric Bretar (2009)
Titre : Pathway detection and geometrical description from ALS data in forested mountaneous area Type de document : Article/Communication Auteurs : Nicolas David , Auteur ; Thomas Pons, Auteur ; Adrien Chauve , Auteur ; Frédéric Bretar, Auteur ; Clément Mallet , Auteur Editeur : International Society for Photogrammetry and Remote Sensing ISPRS Année de publication : 2009 Collection : International Archives of Photogrammetry, Remote Sensing and Spatial Information Sciences, ISSN 1682-1750 num. 38-3/W8 Conférence : ISPRS 2009, Workshop LaserScanning 01/09/2009 02/09/2009 Paris France OA Archives proceedings Importance : pp 242 - 247 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Lasergrammétrie
[Termes IGN] données lidar
[Termes IGN] extraction automatique
[Termes IGN] forêt
[Termes IGN] montagne
[Termes IGN] orthoimage
[Termes IGN] semis de points
[Termes IGN] télémétrie laser aéroportéRésumé : (Auteur) In the last decade, airborne laser scanning (ALS) systems have become an alternative source for the acquisition of altimeter data. Compared to high resolution orthoimages, one of the main advantages of ALS is the ability of the laser beam to penetrate vegetation and reach the ground underneath. Therefore, 3D point clouds are essential data for computing Digital Terrain Models (DTM) in natural and vegetated areas. DTMs are a key product for many applications such as tree detection, flood modelling, archeology or road detection. Indeed, in forested areas, traditional image-based algorithms for road and pathway detection would partially fail due to their occlusion by the canopy cover. Thus, crucial information for forest management and fire prevention such as road width and slope would be misevaluated.
This paper deals with road and pathway detection in a complex forested mountaneous area and with their geometrical parameter extraction using lidar data. Firstly, a three-step image-based methodology is proposed to detect road regions. Lidar feature orthoimages are first generated. Then, road seeds are both automatically and semi-automatically detected. And, a region growing algorithm is carried out to retrieve the full pathways from the seeds previously detected. Secondly, these pathways are vectorized using morphological tools, smoothed, and discretized. Finally, ID sections within the lidar point cloud are successively generated for each point of the pathways to estimate more accurately road widths in 3D. We also retrieve a precise location of the pathway borders and centers, exported as vector data.Numéro de notice : C2009-006 Affiliation des auteurs : MATIS+Ext (1993-2011) Thématique : FORET/IMAGERIE Nature : Communication nature-HAL : ComAvecCL&ActesPubliésIntl DOI : sans En ligne : https://www.isprs.org/proceedings/XXXVIII/3-W8/papers/242_laserscanning09.pdf Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=65046 A la pointe du laser / Françoise de Blomac in SIG la lettre, n° 103 (janvier 2009)
[article]
Titre : A la pointe du laser Type de document : Article/Communication Auteurs : Françoise de Blomac, Auteur Année de publication : 2009 Article en page(s) : pp 10 - 11 Langues : Français (fre) Descripteur : [Vedettes matières IGN] Lasergrammétrie
[Termes IGN] acquisition de données
[Termes IGN] données lidar
[Termes IGN] lasergrammétrie
[Termes IGN] levé topographique
[Termes IGN] modèle numérique de terrain
[Termes IGN] télédétection aérienneRésumé : (Auteur) Le colloque "techniques laser" organisé par la Société Française de Photogrammétrie et de Télédétection (SFPT) à l'Ecole Supérieure des géomètres et Topographes du Mans (ESGT) les 20 et 21 janvier a montré à quel point ces technologies sont prometteuses. Travaux de recherche, expériences d'utilisateurs et présentations industrielles ont alterné sur des domaines aussi variés que l'exploitation martienne, le suivi d'éboulement rocheux ou l'analyse des tourbillons autour d'un avion qui atterrit. Copyright SIG La Lettre Numéro de notice : A2009-016 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article DOI : sans Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=29646
in SIG la lettre > n° 103 (janvier 2009) . - pp 10 - 11[article]Réservation
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Titre : Scalable visualization of massive point clouds Type de document : Article/Communication Auteurs : Gerwin de Haan, Auteur Editeur : Delft : Netherlands Geodetic Commission NGC Année de publication : 2009 Conférence : NCG 2009, seminar Management of massive point cloud data: wet and dry 26/11/2009 02/09/2009 Utrecht Pays-Bas OA Archives proceedings Langues : Français (fre) Descripteur : [Vedettes matières IGN] Lasergrammétrie
[Termes IGN] données lidar
[Termes IGN] données localisées 2D
[Termes IGN] exploration de données
[Termes IGN] réalité virtuelle
[Termes IGN] semis de pointsRésumé : (auteur) Graphical renderings of "raw" point clouds can be visually attractive. When combined, the many individual points and their attributes convey spatial structures, especially when viewed in a fluent 3D fly-through and on a stereoscopic display. For such interactive visualization, a sufficiently responsive graphics update is essential. Where many software packages support simple rendering of smaller (subsets of) point clouds, the size of point clouds currently acquired easily surpasses their rendering capabilities, even on a modern graphics card. We addressed this issue in recent experiments on the visual exploration of LiDAR (Light Detection And Ranging) datasets in our Virtual Reality systems. Out-of-core terrain rendering techniques are applied, which originate from graphic rendering engines used in games and flight-simulators. In this document some of these techniques and results are highlighted, and challenges in balancing rendering performance versus visual quality are discussed. Numéro de notice : 14850 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Communication DOI : sans Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=75696 Documents numériques
en open access
14850 scalable visualizationAdobe Acrobat PDF Scanning and imaging in the city of Bergamo: building geo-knowledge / Luigi Colombo in Geoinformatics, vol 12 n° 1 (01/01/2009)
[article]
Titre : Scanning and imaging in the city of Bergamo: building geo-knowledge Type de document : Article/Communication Auteurs : Luigi Colombo, Auteur ; Barbara Marana, Auteur Année de publication : 2009 Article en page(s) : pp 24 - 27 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Traitement d'image
[Termes IGN] Bergame
[Termes IGN] données laser
[Termes IGN] fusion de données multisource
[Termes IGN] image terrestre
[Termes IGN] lasergrammétrie
[Termes IGN] photogrammétrie terrestre
[Termes IGN] reconstruction 3D du bâti
[Termes IGN] traitement d'imageRésumé : (Auteur) Laser and image geo-technologies can record in a digital way the spatial reality of a building, with its shape and dimensions, colours of materials and decay (geo-knowledge). The different cultural aspect of these topics are examined here in detail and pointed out with the support of a test case regarding a historic building in the city of Bergamo (Italy). Copyright GEOinformatics Numéro de notice : A2009-019 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article DOI : sans Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=29649
in Geoinformatics > vol 12 n° 1 (01/01/2009) . - pp 24 - 27[article]
contenu dans ISPRS Workshop Laserscanning'09, Paris, France, September 1-2, 2009 / Frédéric Bretar (2009)
Titre : A stochastic approach for modelling airborne lidar waveforms Type de document : Article/Communication Auteurs : Clément Mallet , Auteur ; Florent Lafarge, Auteur ; Michel Roux, Auteur ; Uwe Soergel, Auteur ; et al., Auteur Editeur : International Society for Photogrammetry and Remote Sensing ISPRS Année de publication : 2009 Collection : International Archives of Photogrammetry, Remote Sensing and Spatial Information Sciences, ISSN 1682-1750 num. 38-3/W8 Conférence : ISPRS 2009, Workshop LaserScanning 01/09/2009 02/09/2009 Paris France OA Archives proceedings Importance : pp 201 - 206 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Traitement du signal
[Termes IGN] chaîne de Markov
[Termes IGN] données lidar
[Termes IGN] forme d'onde pleine
[Termes IGN] méthode de Monte-Carlo
[Termes IGN] milieu urbain
[Termes IGN] modèle stochastique
[Termes IGN] reconstruction du signal
[Termes IGN] signal laser
[Termes IGN] signal lidarRésumé : (Auteur) In contrast to conventional airborne multi-echo laser scanner systems, full-waveform (FW) lidar systems are able to record the entire emitted and backscattered signals of each laser pulse. Instead of clouds of individual 3D points, FW devices provide ID profiles of the 3D scene, which allows gaining additional and more detailed observations of the illuminated surfaces. Indeed, lidar waveforms are signals consisting of a train of echoes where each of them corresponds to a scattering target of the Earth surface or a group of close objects leading to superimposed signals. Modelling these echoes with the appropriate parametric function is necessary to retrieve physical information about these objects and characterize their properties. Henceforth, the extracted parameters can be useful for subsequent object segmentation and/or classification. This paper presents a stochastic based model to reconstruct lidar waveforms in terms of a set of parametric functions. The model takes into account both a data term which measures the coherence between the proposed configurations and the waveforms, and a regularizing term which introduces physical knowledge on the reconstructed signal. We search for the best configuration of functions by performing a Reversible Jump Markov Chain Monte Carlo sampler coupled with a stochastic relaxation. Finally, the algorithm is validated on waveforms from several airborne lidar sensors, showing the suitability of the approach even when the traditional assumption of Gaussian decomposition of waveforms is invalid. Numéro de notice : C2009-004 Affiliation des auteurs : MATIS+Ext (1993-2011) Thématique : IMAGERIE/POSITIONNEMENT Nature : Communication nature-HAL : ComAvecCL&ActesPubliésIntl DOI : sans En ligne : https://www.isprs.org/proceedings/XXXVIII/3-W8/papers/201_laserscanning09.pdf Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=65044 Taking LIDAR data to the next level / A. Denniss in GEO: Geoconnexion international, vol 8 n° 1 (january 2009)PermalinkThe role of Lidar systems in fuel mapping / António Ferraz (2009)PermalinkTopographic laser ranging and scanning, ch 14. Feature extraction from lidar data in urban areas / Frédéric Bretar (2009)PermalinkPermalinkPermalink3D laser scanning and its 2D partners: looking forward to a harmonious future together / A. Spring in Geoinformatics, vol 11 n° 8 (01/12/2008)PermalinkComparaison de deux méthodes de cartographie de la végétation du schorre de la baie du Mont Saint-Michel : photo-interprétation raisonnée et classification automatique par espèce / Clélia Bilodeau in Photo interprétation, vol 44 n° 3 - 4 (Décembre 2008)PermalinkContribution of two plane detection to recognition of intact and damaged buildings in Lidar data / M. Rehor in Photogrammetric record, vol 23 n° 124 (December 2008 - February 2009)PermalinkA knowledge-based approach to urban feature classification using aerial imagery with Lidar data / M. Huang in Photogrammetric Engineering & Remote Sensing, PERS, vol 74 n° 12 (December 2008)PermalinkLa limite Slikke/Schorre dans la baie du Mont Saint-Michel (Golfe Normand-Breton, Nord Ouest France) / H. Kaveh in Photo interprétation, vol 44 n° 3 - 4 (Décembre 2008)PermalinkThe caves of Naica - Laser scanning in extreme: scanning the caves of Naica in Mexico / E. Canavese in Geoinformatics, vol 11 n° 8 (01/12/2008)PermalinkWater Modeler: a component of a coastal zone decision support system to generate flood-risk maps from storm surge events and sea-level rise / T.L. Webster in Geomatica, vol 62 n° 4 (December 2008)PermalinkLaser scanning in the Tver region of Russia: surveying and 3D modeling of a high-voltage substation / S. Gorbunov in Geoinformatics, vol 11 n° 7 (01/11/2008)PermalinkPrediction and visualization of GPS multipath signals in urban areas using LiDAR Digital Surface Models and building footprints / J. Li in International journal of geographical information science IJGIS, vol 22 n°11-12 (november 2008)PermalinkA revolution in geomorphology: laser altimetry and terrain analysis / N. Anders in GIM international, vol 22 n° 11 (November 2008)PermalinkUsing a binary space partitioning tree for reconstructing polyhedral building models from airborne Lidar data / Gunho Sohn in Photogrammetric Engineering & Remote Sensing, PERS, vol 74 n° 11 (November 2008)PermalinkAnalysis of planimetric accuracy of airborne laser scanning surveys / M. George Vosselman in Bulletin des sciences géographiques, n° 22 (octobre 2008)PermalinkAnalysis of full-waveform lidar data for classification of urban areas / Clément Mallet in Photogrammetrie Fernerkundung Geoinformation, vol 2008 n° 5 ([01/09/2008])PermalinkAspects of generating precise digital terrain models in the Wadden Sea from lidar-water classification and structure line extraction / A. Brzank in ISPRS Journal of photogrammetry and remote sensing, vol 63 n° 5 (September - October 2008)PermalinkCoastal surveying techniques / C. Pennington in Geoinformatics, vol 11 n° 6 (01/09/2008)Permalink