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IFSAR and LIDAR: the best of both worlds / Intermap technologies in GEO: Geoconnexion international, vol 8 n° 1 (january 2009)
[article]
Titre : IFSAR and LIDAR: the best of both worlds Type de document : Article/Communication Auteurs : Intermap technologies, Auteur Année de publication : 2009 Article en page(s) : pp 40 - 42 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Lasergrammétrie
[Termes IGN] coût
[Termes IGN] données lidar
[Termes IGN] fiabilité des données
[Termes IGN] fusion de données multisource
[Termes IGN] interféromètrie par radar à antenne synthétique
[Termes IGN] Lidar
[Termes IGN] modèle numérique de terrain
[Termes IGN] télémétrie laser aéroporté
[Termes IGN] télémétrie laser terrestreRésumé : (Auteur) Intermap Technologies looks at producing a cost-effective and reliable data fusion solution. Copyright Geo:Geoconnexion Numéro de notice : A2009-090 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article DOI : sans Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=29720
in GEO: Geoconnexion international > vol 8 n° 1 (january 2009) . - pp 40 - 42[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 062-09011 RAB Revue Centre de documentation En réserve L003 Disponible A multi-directional ground filtering algorithm for airborne LIDAR / X. Meng in ISPRS Journal of photogrammetry and remote sensing, vol 64 n° 1 (January - February 2009)
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[article]
Titre : A multi-directional ground filtering algorithm for airborne LIDAR Type de document : Article/Communication Auteurs : X. Meng, Auteur ; L. Wang, Auteur ; et al., Auteur Année de publication : 2009 Article en page(s) : pp 117 - 124 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Lasergrammétrie
[Termes IGN] algorithme de filtrage
[Termes IGN] données lidar
[Termes IGN] données localisées 3D
[Termes IGN] Kappa de Cohen
[Termes IGN] modèle 3D de l'espace urbain
[Termes IGN] modèle numérique de terrain
[Termes IGN] signal laserRésumé : (Auteur) Automatic ground filtering for Light Detection And Ranging (LIDAR) data is a critical process for Digital Terrain Model (DTM) and three-dimensional urban model generation. Although researchers have developed many methods to separate bare ground from other urban features, the problem has not been fully solved due to the similar characteristics possessed by ground and non-ground objects, especially on abrupt surfaces. Current methods can be grouped into two major categories: neighborhood-based approaches and directional filtering. In this study, following the direction of the second branch, we propose a new Multi-directional Ground Filtering (MGF) algorithm to incorporate a two-dimensional neighborhood in the directional scanning so as to prevent the errors introduced by the sensitivity to directions. Besides this, the MGF algorithm explores the utility of identifying pattern varieties in different directions across an image. The authors conducted a comprehensive test of the performance on fifteen study sites and compared our results to eight other publicized methods based on the Kappa coefficients calculated from the error matrices reported by ISPRS. Overall, the MGF filter produces a promising performance in both urban and forest areas. The size and shape of non-ground objects do not pose significant influence on the performance of the MGF algorithm. The fact that MGF algorithm is robust to two commonly required parameters, slope and elevation difference thresholds, has added practical merits to be adopted in different landscapes. Copyright ISPRS Numéro de notice : A2009-031 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1016/j.isprsjprs.2008.09.001 En ligne : https://doi.org/10.1016/j.isprsjprs.2008.09.001 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=29661
in ISPRS Journal of photogrammetry and remote sensing > vol 64 n° 1 (January - February 2009) . - pp 117 - 124[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 081-09011 SL Revue Centre de documentation Revues en salle Disponible New integration approach of photogrammetric and LIDAR techniques for architectural survey / Francesco Nex (2009)
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contenu dans ISPRS Workshop Laserscanning'09, Paris, France, September 1-2, 2009 / Frédéric Bretar (2009)
Titre : New integration approach of photogrammetric and LIDAR techniques for architectural survey Type de document : Article/Communication Auteurs : Francesco Nex, Auteur ; Fulvio Rinaudo, 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 12 - 17 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications photogrammétriques
[Termes IGN] analyse combinatoire (maths)
[Termes IGN] données lidar
[Termes IGN] fusion d'images
[Termes IGN] intégration de données
[Termes IGN] photogrammétrie architecturale
[Termes IGN] semis de points
[Termes IGN] surveillance d'ouvrageRésumé : (Auteur) In the last few years, LIDAR and image-matching techniques have been employed in many application fields because of their quickness in point cloud generation. Nevertheless, these techniques do not assure complete and reliable results, especially in complex applications such as architectural surveys: laser scanning techniques do not allow the correct position of object breaklines to be extracted while image matching results require an accurate editing and they are not acceptable for bad-textured images. For this reason several authors have already suggested overcoming of these problems through a combination of LIDAR and photogrammetric techniques. These works considers the integration as the possibility to share point clouds generated by these techniques; however, a complete and automatic integration, in order to achieve more complete information, has never been implemented. In this paper, a new integration approach is proposed. This integration is focused on the possibility of overcoming the problems of each technique. In this approach LIDAR and multi-image matching techniques combine and share information in order to extract building breaklines in the space, perform the point cloud segmentation and speed up the modelling process in an automatic way. This integration is still an ongoing process: the algorithm workflow and first performed tests on real facades are presented in this paper, in order to evaluate the reliability of the proposed method; finally, an overview on the future developments is offered. Numéro de notice : C2009-002 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Communication DOI : sans En ligne : https://www.isprs.org/proceedings/XXXVIII/3-W8/papers/12_laserscanning09.pdf Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=65042 Not going with the proverbal flow / A. Riley in GEO: Geoconnexion international, vol 8 n° 1 (january 2009)
[article]
Titre : Not going with the proverbal flow Type de document : Article/Communication Auteurs : A. Riley, Auteur Année de publication : 2009 Article en page(s) : pp 19 - 21 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Lasergrammétrie
[Termes IGN] cours d'eau
[Termes IGN] données lidar
[Termes IGN] marais
[Termes IGN] modèle numérique de terrain
[Termes IGN] modélisation 3D
[Termes IGN] niveau de l'eau
[Termes IGN] zone humideRésumé : (Auteur) How an active nonprofit organization is utilizing Lidar to restore neglected streams and wetlands. Copyright Geo:Geoconnexion Numéro de notice : A2009-088 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article DOI : sans Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=29718
in GEO: Geoconnexion international > vol 8 n° 1 (january 2009) . - pp 19 - 21[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 062-09011 RAB Revue Centre de documentation En réserve L003 Disponible Pathway detection and geometrical description from ALS data in forested mountaneous area / Nicolas David (2009)
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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 PermalinkPermalinkScanning and imaging in the city of Bergamo: building geo-knowledge / Luigi Colombo in Geoinformatics, vol 12 n° 1 (01/01/2009)
PermalinkPermalinkTaking LIDAR data to the next level / A. Denniss in GEO: Geoconnexion international, vol 8 n° 1 (january 2009)
PermalinkPermalinkTopographic 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)
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