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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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Modelling and prediction of GPS availability with digital photogrammetry and LiDAR / Georges E. Taylor in International journal of geographical information science IJGIS, vol 21 n° 1-2 (january 2007)  

Public [article]  inInternational journal of geographical information science IJGIS > vol 21 n° 1-2 (january 2007) . - pp 1 - 20 Titre : Modelling and prediction of GPS availability with digital photogrammetry and LiDAR Type de document : Article/Communication Auteurs : Georges E. Taylor, Auteur ; J. Li, Auteur ; et al., Auteur Année de publication : 2007 Article en page(s) : pp 1 - 20 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications photogrammétriques [Termes IGN] application informatique [Termes IGN] constellation GPS [Termes IGN] données lidar [Termes IGN] modèle numérique de terrain [Termes IGN] photogrammétrie numérique [Termes IGN] positionnement cinématique en temps réel [Termes IGN] récepteur GPS [Termes IGN] satellite GPS [Termes IGN] système d'information géographique [Termes IGN] temps réel [Termes IGN] visibilité Résumé : (Auteur) This paper describes an automated method for predicting the number of satellites visible to a GPS receiver, at any point on the Earth's surface at any time. Intervisibility analysis between a GPS receiver and each potentially visible GPS satellite is performed using a number of different surface models and satellite orbit calculations. The developed software can work with various ephemeris data, and will compute satellite visibility in real time. Real-time satellite availability prediction is very useful for mobile applications such as in-car navigation systems, personal navigations systems and LBS. The implementation of the method is described and the results are reported. Copyright Taylor & Francis Numéro de notice : A2007-023 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article DOI : 10.1080/13658810600816540 En ligne : https://doi.org/10.1080/13658810600816540 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=28389 [article]

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Web and Wireless Geographical Information Systems, W2GIS 2007 / J. Mark Ware (2007)  

Public Titre : Web and Wireless Geographical Information Systems, W2GIS 2007 : 7th International Symposium, Cardiff, UK, November 28-29, 2007 : Proceedings Type de document : Actes de congrès Auteurs : J. Mark Ware, Éditeur scientifique ; Georges E. Taylor, Éditeur scientifique Editeur : Berlin, Heidelberg, Vienne, New York, ... : Springer Année de publication : 2007 Collection : Lecture notes in Computer Science, ISSN 0302-9743 num. 4857 Conférence : W2GIS 2007, 7th international symposium Web and Wireless Geographical Information Systems 28/11/2007 29/11/2007 Cardiff Royaume-Uni Proceedings Springer Importance : 292 p. Format : 15 x 23 cm ISBN/ISSN/EAN : 978-3-540-76293-1 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géomatique web [Termes IGN] requête spatiale [Termes IGN] réseau de capteurs [Termes IGN] service web géographique [Termes IGN] traitement automatique de données [Termes IGN] Web Processing Service [Termes IGN] web sémantique [Termes IGN] WebSIG Résumé : (éditeur) These proceedings contain the papers selected for presentation at the Seventh International Symposium on Web and Wireless Geographical Information Systems (W2GIS 2007). The symposium was organized locally by the University of Glamorgan (UK) and held in Cardiff (UK) in November 2007. It was the latest in a series of annual events that started in Kyoto 2001 and now alternate locations each year between East Asia and Europe. As in previous years, the aim of the symposium was to provide an up-to-date review of advances and recent developments in theoretical and technical issues relating to Web and wireless GIS technologies. The symposium organizers received 45 full papers in response to the call for papers. These papers went through a thorough review process, with each paper being assessed by at least three reviewers. The quality of papers was high, and 21 were selected for presentation and inclusion in these proceedings. It was particularly pleasing to note that 19 different countries are represented by the authors of selected papers. The keynote address was delivered by Jonathan Raper of City University, London, in which he talked about his research work in the areas of location-based services and mobile information needs. We wish to thank all the authors that submitted papers to this symposium. Our special thanks go to all those who attended, and particularly those who presented. Numéro de notice : 17076 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE/INFORMATIQUE Nature : Actes DOI : 10.1007/978-3-540-76925-5 En ligne : https://doi.org/10.1007/978-3-540-76925-5 Format de la ressource électronique : URL Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=79397

Voir aussi

• The need for Web legend services / Bénédicte Bucher (2007)  

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Mapping Dilution of Precision (MDOP) and map-matched GPS / Geoffrey Blewitt in International journal of geographical information science IJGIS, vol 16 n° 1 (january 2002)  

Public [article]  inInternational journal of geographical information science IJGIS > vol 16 n° 1 (january 2002) . - pp 55 - 67 Titre : Mapping Dilution of Precision (MDOP) and map-matched GPS Type de document : Article/Communication Auteurs : Geoffrey Blewitt, Auteur ; Georges E. Taylor, Auteur Année de publication : 2002 Article en page(s) : pp 55 - 67 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Navigation et positionnement [Termes IGN] affaiblissement géométrique de la précision [Termes IGN] appariement de cartes [Termes IGN] correction [Termes IGN] erreur de positionnement [Termes IGN] GPS assisté pour la navigation (technologies) [Termes IGN] GPS en mode différentiel [Termes IGN] méthode des moindres carrés [Termes IGN] navigation automobile [Termes IGN] positionnement différentiel [Termes IGN] véhicule automobile Résumé : (Auteur) A novel method of map matching using the Global Positioning System (GPS) has been developed which uses digital mapping and height data to augment point position computation. This method reduces the error in position, which is a sum from several sources, including signal delay due to the ionosphere and atmosphere and until recently from 'selective availability' (S/A). S/A was imposed by the US military to degrade purposefully the accuracy of GPS, but was switched off on 2 May 2000, and is to be replaced with 'regional denial capabilities in lieu of global degradation' (Interagency GPS Executive Board, 2000). Taylor et al. (2001) describe the Road Reduction Filter (RRF) in detail. RRF is a method of detecting the correct road on which a vehicle is travelling. In the work described here, the position error vector is estimated in a formal least squares procedure, as the vehicle is moving. This estimate is a map-matched correction, that provides an autonomous alternative to DGPS for in-car navigation and fleet management. In this paper, a formula is derived for 'Mapped Dilution of Precision' (MDOP), defined as the theoretical ratio of position precision using map-matched corrections to that using perfect Differential GPS (DGPS) correction. This is shown to be purely a function of route geometry, and is computed for examples of basic road shapes. MDOP is favourable unless the route has less than a few degrees curvature for several kilometres. MDOP can thus provide an objective estimate of positioning precision to a vehicle driver. Precision estimates using MDOP are shown to agree well with 'true' positioning errors determined using high precision (cm) GPS carrier phase techniques. The exact location of a vehicle on a road is essential for accurate surveying applications. These include close range photogrammetry using digital video or still cameras and the verification of digital mapping by measured (GPS and other sensors) trajectories. Numéro de notice : A2002-004 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article DOI : 10.1080/13658810110075996 En ligne : https://doi.org/10.1080/13658810110075996 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=21921 [article]

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Crime in the spotlight: GPS patrols Calgary's skies / Georges E. Taylor in GPS world, vol 9 n° 4 (April 1998)

Public [article]  inGPS world > vol 9 n° 4 (April 1998) . - pp 26 - 33 Titre : Crime in the spotlight: GPS patrols Calgary's skies Type de document : Article/Communication Auteurs : Georges E. Taylor, Auteur Année de publication : 1998 Article en page(s) : pp 26 - 33 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications de géodésie spatiale [Termes IGN] Calgary [Termes IGN] caméra numérique [Termes IGN] capteur aérien [Termes IGN] positionnement par GPS [Termes IGN] rayonnement infrarouge [Termes IGN] récepteur GPS [Termes IGN] système d'information géographique Résumé : La police de Calgary (Canada) a l'usage d'un hélicoptère équipé de caméra infrarouge, de récepteur GPS, de SIG, aussi bien pour la surveillance aérienne, la reconnaissance que pour la poursuite. Numéro de notice : A1998-071 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article DOI : sans Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=26038 [article]

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A generic large-scale spatial data model for surveyors: changing practices and processes / D. Parker (1995)

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Multispectral scanning systems and their potential application to Earth resource surveys, prepared under ESRO contract n° ESTEC 1673/72 EL, Volume 3. Data processing / Q.S. Earl (1973)

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