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Taking positioning indoors: Wi-Fi localization and GNSS / K. Pahlavan in Inside GNSS, vol 5 n° 3 (May 2010)
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Titre : Taking positioning indoors: Wi-Fi localization and GNSS Type de document : Article/Communication Auteurs : K. Pahlavan, Auteur ; F. Akguland, Auteur ; T. Morgan, Auteur ; et al., Auteur Année de publication : 2010 Article en page(s) : 8 p. ; pp 40 - 47 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Navigation et positionnement
[Termes IGN] positionnement en intérieur
[Termes IGN] réseau local sans fil
[Termes IGN] WiFiRésumé : (Auteur) Solving the challenge of robust, reliable positioning in GNSS signal-challenged environments has long represented a kind of Holy Grail for product designers, systems integrators, and service providers. One promising approach is to combine GNSS with terrestrial systems that use existing wireless infrastructures. This article describes how Skyhook Wireless has succeeded with GPS and wireless local area networks - better known as Wi-Fi. As a result, its technology is now incorporated into a wide range of mobile “connected” platforms, including smart devices such as Apple’s iPhone and iPod. Numéro de notice : A2010-622 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article DOI : sans Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=33448
in Inside GNSS > vol 5 n° 3 (May 2010) . - 8 p. ; pp 40 - 47[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 159-2010031 SL Revue Centre de documentation Revues en salle Disponible Documents numériques
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Taking positioning indoors ... - pdf éditeurAdobe Acrobat PDFThe Forward Propagation of Integrated System Component Errors within Airborne Lidar Data / T. Goulden in Photogrammetric Engineering & Remote Sensing, PERS, vol 76 n° 5 (May 2010)
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Titre : The Forward Propagation of Integrated System Component Errors within Airborne Lidar Data Type de document : Article/Communication Auteurs : T. Goulden, Auteur ; Christopher Hopkinson, Auteur Année de publication : 2010 Article en page(s) : pp 589 - 601 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Lasergrammétrie
[Termes IGN] données lidar
[Termes IGN] erreur en position
[Termes IGN] géoréférencement direct
[Termes IGN] GPS-INS
[Termes IGN] propagation d'erreur
[Termes IGN] varianceRésumé : (Auteur) Error estimates of lidar observations are obtained by applying the General Law of Propagation of Variances (GLOPOV) to the direct georeferencing equation. Within the formulation of variance propagation, the most important consideration is the values used to describe the error of the hardware component observations including the global positioning system, inertial measurement unit, laser ranger, and laser scanner (angular encoder noise and beam divergence). Data tested yielded in general, pessimistic predictions as 85 percent of residuals were within the predicted error level. Simulated errors for varying scan angles and altitudes produced horizontal errors largely influenced by IMU subsystem error as well as angular encoder noise and beam divergence. GPS subsystem errors contribute the largest proportion of vertical error only at shallow scan angles and low altitudes. The transformation of the domination of GPS related error sources to total vertical error occurs at scan angles of 23°, 13°, and 8° at flying heights of 1,200 m, 2,000 m, and 3,000 m AGL, respectively. Copyright ASPRS Numéro de notice : A2010-162 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article DOI : 10.14358/PERS.76.5.589 En ligne : https://doi.org/10.14358/PERS.76.5.589 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=30357
in Photogrammetric Engineering & Remote Sensing, PERS > vol 76 n° 5 (May 2010) . - pp 589 - 601[article]A case study of using Raman lidar measurements in high-accuracy GPS applications / Pierre Bosser in Journal of geodesy, vol 84 n° 4 (April 2010)
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Titre : A case study of using Raman lidar measurements in high-accuracy GPS applications Type de document : Article/Communication Auteurs : Pierre Bosser , Auteur ; Olivier Bock
, Auteur ; Christian Thom
, Auteur ; Jacques Pelon, Auteur ; Pascal Willis
, Auteur
Année de publication : 2010 Article en page(s) : pp 251 - 265 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie spatiale
[Termes IGN] diffusion de Raman
[Termes IGN] lidar Raman
[Termes IGN] positionnement par GPS
[Termes IGN] propagation du signal
[Termes IGN] propagation troposphérique
[Termes IGN] vapeur d'eauRésumé : (Auteur) This paper investigates the impact of rapid small-scale water vapor fluctuations on GPS height determination. Water vapor measurements from a Raman lidar are used for documenting the water vapor heterogeneities and correcting GPS signal propagation delays in clear sky conditions. We use data from four short observing sessions (6 h) during the VAPIC experiment (15 May–15 June 2004). The retrieval of wet delays from our Raman lidar is shown to agree well with radiosonde retrievals (bias and standard deviation (SD) were smaller than 1 and 2.8 mm, respectively) and microwave radiometers (from two different instruments, bias was 6.0/-6.6 mm and SD 1.3/3.8 mm). A standard GPS data analysis is shown to fail in accurately reproducing fast zenith wet delay (ZWD) variations. The ZWD estimates could be improved when mean post-fit phase residuals were removed. Several methodologies for integrating zenith lidar observations into the GPS data processing are also presented. The final method consists in using lidar wet delays for correcting a priori the GPS phase observations and estimating a scale factor for the lidar wet delays jointly with the GPS station position. The estimation of this scale factor allows correcting for a mis-calibration in the lidar data and provides in the same way an estimate of the Raman lidar instrument constant. The agreement of this constant with an independent determination using radiosonde data is at the level of 1–4%. The lidar wet delays were derived by ray-tracing from zenith pointing measurements: further improvement in GPS positioning is expected from slant path lidar measurements that would properly account for water vapor anisotropy. Copyright Springer Numéro de notice : A2010-152 Affiliation des auteurs : IGN+Ext (1940-2011) Thématique : POSITIONNEMENT Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1007/s00190-009-0362-x Date de publication en ligne : 24/12/2009 En ligne : https://doi.org/10.1007/s00190-009-0362-x Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=30347
in Journal of geodesy > vol 84 n° 4 (April 2010) . - pp 251 - 265[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 266-2010041 MANQUANT Revue Centre de documentation Indéterminé Disponible Detection of roadway sign condition changes using multi-scale sign image matching (M-SIM) / Y.J. Tsai in Photogrammetric Engineering & Remote Sensing, PERS, vol 76 n° 4 (April 2010)
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Titre : Detection of roadway sign condition changes using multi-scale sign image matching (M-SIM) Type de document : Article/Communication Auteurs : Y.J. Tsai, Auteur ; Z. Hu, Auteur ; C. Alberti, Auteur Année de publication : 2010 Article en page(s) : pp 391 - 405 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Traitement d'image
[Termes IGN] analyse d'image numérique
[Termes IGN] appariement d'images
[Termes IGN] classification
[Termes IGN] détection de changement
[Termes IGN] données multiéchelles
[Termes IGN] image vidéo
[Termes IGN] Louisiane (Etats-Unis)
[Termes IGN] positionnement par GPS
[Termes IGN] réseau routier
[Termes IGN] signalisation routièreRésumé : (Auteur) Roadway signs are important for safety, and transportation agencies need to identify sign condition changes to perform timely maintenance, including replacement. Currently, sign condition changes are inspected manually in the field, which is time consuming, costly, and some--times dangerous. This paper first proposes a novel algorithm to detect three condition changes: missing, tilted, and blocked signs, using GPS data and video log images. The algorithm consists of three steps: (a) Multi-Scale Sign Image Matching (m-sim), (b) Image feature analysis, and (c) Sign condition change detection and classification. The algorithm was tested using images with simulated sign condition changes and actual video images taken in Fiscal Year (fy) 2003 and 2005 by the Louisiana Department of Transportation and Development (ladotd). The tests demonstrate the algorithm is effective to detect three types of sign condition changes. Out of 34,000 actual video log images, the algorithm detected and classified 100 percent of the missing signs, 72.7 percent of the tilted signs, and 66.7 percent of the blocked signs, for an overall 74.3 percent detection rate. These results show that the algorithm is useful for developing an intelligent roadway sign condition change detection system. Copyright ASPRS Numéro de notice : A2010-120 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article DOI : 10.14358/PERS.76.4.391 En ligne : https://doi.org/10.14358/PERS.76.4.391 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=30316
in Photogrammetric Engineering & Remote Sensing, PERS > vol 76 n° 4 (April 2010) . - pp 391 - 405[article]Evaluating the benefits of multimodal interface design for compass-a mobile GIS / J. Doyle in Geoinformatica, vol 14 n° 2 (April 2010)
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Titre : Evaluating the benefits of multimodal interface design for compass-a mobile GIS Type de document : Article/Communication Auteurs : J. Doyle, Auteur ; Michela Bertolotto, Auteur ; D. Wilson, Auteur Année de publication : 2010 Article en page(s) : pp 135 - 162 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Systèmes d'information géographique
[Termes IGN] interface multimodale
[Termes IGN] interface utilisateur
[Termes IGN] positionnement par GNSS
[Termes IGN] service fondé sur la position
[Termes IGN] SIG nomade
[Termes IGN] utilisateur nomadeRésumé : (Auteur) The context of mobility raises many issues for geospatial applications providing location-based services. Mobile device limitations, such as small user interface footprint and pen input whilst in motion, result in information overload on such devices and interfaces which are difficult to navigate and interact with. This has become a major issue as mobile GIS applications are now being used by a wide group of users, including novice users such as tourists, for whom it is essential to provide easy-to-use applications. Despite this, comparatively little research has been conducted to address the mobility problem. We are particularly concerned with the limited interaction techniques available to users of mobile GIS which play a primary role in contributing to the complexity of using such an application whilst mobile. As such, our research focuses on multimodal interfaces as a means to present users with a wider choice of modalities for interacting with mobile GIS applications. Multimodal interaction is particularly advantageous in a mobile context, enabling users of location-based applications to choose the mode of input that best suits their current task and location. The focus of this article concerns a comprehensive user study which demonstrates the benefits of multimodal interfaces for mobile geospatial applications. Copyright Springer Numéro de notice : A2010-063 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE/INFORMATIQUE Nature : Article DOI : 10.1007/s10707-009-0079-2 Date de publication en ligne : 10/03/2009 En ligne : https://doi.org/10.1007/s10707-009-0079-2 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=30259
in Geoinformatica > vol 14 n° 2 (April 2010) . - pp 135 - 162[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 057-2010021 RAB Revue Centre de documentation En réserve L003 Disponible Real-time adjustment underwater positioning system for submarines / W. Cheng in Marine geodesy, vol 33 n° 2-3 (April - September 2010)
Permalink1 antenna, 3 dimensions: GPS flight control in UAV operations / C. Kee in Inside GNSS, vol 5 n° 2 (March - April 2010)
PermalinkConsistency of accuracy assessment indices for soft classification: simulation analysis / J. Chen in ISPRS Journal of photogrammetry and remote sensing, vol 65 n° 2 (March - April 2010)
PermalinkHybrid positioning: a prototype system for navigation in GPS-challenged environments / Chris Rizos in GPS world, vol 21 n° 3 (March 2010)
PermalinkReal-time registration of airborne laser with sub-decimeter accuracy / Jan Skaloud in ISPRS Journal of photogrammetry and remote sensing, vol 65 n° 2 (March - April 2010)
PermalinkWide-area RTK: high precision positioning on a continental scale / Manuel Hernández-Pajares in Inside GNSS, vol 5 n° 2 (March - April 2010)
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