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The use of LiDAR in digital surface modelling: issues and errors / C. Leigh in Transactions in GIS, vol 13 n° 4 (August 2009)  

Public [article]  inTransactions in GIS > vol 13 n° 4 (August 2009) . - pp 345 - 361 Titre : The use of LiDAR in digital surface modelling: issues and errors Type de document : Article/Communication Auteurs : C. Leigh, Auteur ; D. Kidner, Auteur ; M.C. Thomas, Auteur Année de publication : 2009 Article en page(s) : pp 345 - 361 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Lasergrammétrie [Termes IGN] analyse de données [Termes IGN] données lidar [Termes IGN] données localisées 3D [Termes IGN] erreur géométrique [Termes IGN] littoral [Termes IGN] modèle numérique de surface [Termes IGN] modèle numérique de terrain [Termes IGN] Pays de Galles Résumé : (Auteur) Modelling and extracting 3D geographical data presents numerous challenges that require continual research to attempt to evolve an efficient, reliable and accurate solution. LiDAR data capture and analysis has become a preferred acquisition choice for elevation data because the resulting quality and level of detail far exceeds traditional methods for large survey areas. As with any data collection system, LiDAR is prone to errors. Analysing these errors, ascertaining causes and producing error correction strategies is vital if accurate and confident results are to be obtained. Eight years of LiDAR datasets (from 1998 to 2005) have been closely analysed for a large coastal area of South Wales. This article provides a detailed and accurate summary of the identified LiDAR data issues and subsequent errors which affect the accuracy of end products such as Digital Surface Models (DSMs). Copyright Blackwell Publishing Numéro de notice : A2009-527 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1111/j.1467-9671.2009.01168.x En ligne : https://doi.org/10.1111/j.1467-9671.2009.01168.x Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=30156 [article]

Prediction 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)  

Public [article]  inInternational journal of geographical information science IJGIS > vol 22 n°11-12 (november 2008) . - pp 1197 - 1218 Titre : Prediction and visualization of GPS multipath signals in urban areas using LiDAR Digital Surface Models and building footprints Type de document : Article/Communication Auteurs : J. Li, Auteur ; Georges E. Taylor, Auteur ; D. Kidner, Auteur ; M. Ware, Auteur Année de publication : 2008 Article en page(s) : pp 1197 - 1218 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie spatiale [Termes IGN] bâtiment [Termes IGN] dégradation du signal [Termes IGN] données lidar [Termes IGN] empreinte [Termes IGN] incertitude géométrique [Termes IGN] lancer de rayons [Termes IGN] milieu urbain [Termes IGN] modèle numérique de surface [Termes IGN] propagation du signal [Termes IGN] signal GPS [Termes IGN] trajet multiple [Termes IGN] visualisation de données Résumé : (Auteur) This paper explains a ray tracing method which is applied to prediction and visualization of diffracted and reflected GPS signals in dense urban areas. Reflected and diffracted signals can have a detrimental effect on GPS positioning accuracy especially in highly built-up areas. The ray tracing technique implemented in this paper is specially geared to LiDAR height pole data at 1-m spatial resolution and 2D building footprints in raster and vector format, respectively. Such a simple data format allows for rapid implementation of 3D ray tracing in a GIS without further processing so that detailed 3D urban models in vector format are not required. Issues of spatial uncertainty in the data used are also addressed in relation to the identification of multipath signals. Some preliminary results obtained from fieldwork are presented and analysed in detail. Copyright Taylor & Francis Numéro de notice : A2008-400 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article DOI : 10.1080/13658810701851396 En ligne : https://doi.org/10.1080/13658810701851396 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=29392 [article]

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Code-barres	Cote	Support	Localisation	Section	Disponibilité
079-08071	RAB	Revue	Centre de documentation	En réserve L003	Disponible
079-08072	RAB	Revue	Centre de documentation	En réserve L003	Disponible