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Enhanced trajectory estimation of mobile laser scanners using aerial images / Zille Hussnain in ISPRS Journal of photogrammetry and remote sensing, vol 173 (March 2021)  

Public [article]  inISPRS Journal of photogrammetry and remote sensing > vol 173 (March 2021) . - pp 66 - 78 Titre : Enhanced trajectory estimation of mobile laser scanners using aerial images Type de document : Article/Communication Auteurs : Zille Hussnain, Auteur ; Sander J. Oude Elberink, Auteur ; M. George Vosselman, Auteur Année de publication : 2021 Article en page(s) : pp 66 - 78 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Lasergrammétrie [Termes IGN] appariement de points [Termes IGN] atténuation du signal [Termes IGN] balayage laser [Termes IGN] canyon urbain [Termes IGN] centrale inertielle [Termes IGN] données lidar [Termes IGN] erreur [Termes IGN] image captée par drone [Termes IGN] mesurage par GNSS [Termes IGN] semis de points [Termes IGN] trajectoire [Termes IGN] trajet multiple Résumé : (auteur) Multipath effects and signal obstruction by buildings in urban canyons can lead to inaccurate GNSS measurements and therefore errors in the estimated trajectory of Mobile Laser Scanning (MLS) systems; consequently, derived point clouds are distorted and lose spatial consistency. We obtain decimetre-level trajectory accuracy making use of corresponding points between the MLS data and aerial images with accurate exterior orientations instead of using ground control points. The MLS trajectory is estimated based on observation equations resulting from these corresponding points, the original IMU observations, and soft constraints on the pitch and yaw rotations of the vehicle. We analyse the quality of the trajectory enhancement under several conditions where the experiments were designed to test the influence of the number and quality of corresponding points and to test different settings for a B-spline representation of the vehicle trajectory. The method was tested on two independently acquired MLS datasets in Rotterdam by enhancing the trajectories and evaluating them using checkpoints. The RMSE values of the original GNSS/IMU based Kalman filter results at the checkpoints were 0.26 m, 0.30 m, and 0.47 m for the X-, Y- and Z-coordinates in the first dataset and 1.10 m, 1.51 m, and 1.81 m in the second dataset. The latter dataset was recorded with a lower quality IMU in an area with taller buildings. After trajectory adjustment these RMSE values were reduced to 0.09 m, 0.11 m, and 0.16 m for the first dataset and 0.12 m, 0.14 m, and 0.18 m for the second dataset. The results confirmed that, if sufficient tie points between the point cloud and aerial imagery are available, the method supports geo-referencing of MLS point clouds in urban canyons with a near-decimetre accuracy. Numéro de notice : A2021-102 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1016/j.isprsjprs.2021.01.005 Date de publication en ligne : 17/01/2021 En ligne : https://doi.org/10.1016/j.isprsjprs.2021.01.005 Format de la ressource électronique : url article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=96877 [article]

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Performance analysis of GLONASS integration with GPS vectorised receiver in urban canyon positioning / Amir Tabatabaei in Survey review, vol 51 n° 368 (September 2019)  

Public [article]  inSurvey review > vol 51 n° 368 (September 2019) . - pp 460 - 471 Titre : Performance analysis of GLONASS integration with GPS vectorised receiver in urban canyon positioning Type de document : Article/Communication Auteurs : Amir Tabatabaei, Auteur ; Mohammad-Reza Mosavi, Auteur Année de publication : 2019 Article en page(s) : pp 460 - 471 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie spatiale [Termes IGN] canyon urbain [Termes IGN] positionnement par GNSS [Termes IGN] positionnement statique [Termes IGN] récepteur GLONASS [Termes IGN] récepteur GPS [Termes IGN] test de performance Résumé : (Auteur) Urban-canyon positioning encounters many problems such as successive attenuation and even blocking of the signals. Vectorised receiver is a solution in which stronger signals aid weak and blocked ones to be tracked and reacquired. On the other hand, limited accessibility to the sky makes trouble in the performance of navigation filter. As the result, integration of satellite-based positioning systems is suggested to increase the number of visible satellites in the receiver view. In this paper, the architecture of an implemented GPS-combined-GLONASS Vectorised Receiver (GGVR) in a software platform is explored and its advantages rather than a GPS-only Vectorised Receiver (GVR) are demonstrated analytically. Experimental tests in different static and dynamic scenarios are also included. The results show that in the urban-canyon trajectory where the GVR has only 80% availability, the GGVR positioning solution is 100% available in the whole movement duration. Numéro de notice : A2019-387 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1080/00396265.2018.1481181 Date de publication en ligne : 13/06/2018 En ligne : https://doi.org/10.1080/00396265.2018.1481181 Format de la ressource électronique : URL Article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=93477 [article]

Different strategies of housing design / Ayşem Berrin Çakmaklı (2019)  

Public Titre : Different strategies of housing design Type de document : Monographie Auteurs : Ayşem Berrin Çakmaklı, Éditeur scientifique Editeur : London [UK] : IntechOpen Année de publication : 2019 Importance : 104 p. Format : 21 x 30 cm ISBN/ISSN/EAN : 978-1-78984-386-6 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Urbanisme [Termes IGN] canyon urbain [Termes IGN] climat urbain [Termes IGN] développement durable [Termes IGN] effet de serre [Termes IGN] géographie urbaine [Termes IGN] habitat durable [Termes IGN] Italie [Termes IGN] logement [Termes IGN] Nigéria [Termes IGN] politique sociale [Termes IGN] qualité de l'air [Termes IGN] ville durable Résumé : (auteur) As one of the largest consumers of energy, the housing sector and its unconscious occupants' activities negatively affect the environment. Architects and engineers have a major role in resolving the associated problems while maintaining comfort for occupants. Also very important are environmental education and awareness of appropriate environmental development in designing activity and selecting building materials and products. There are different architectural strategies that are aimed to achieve a low-energy built environment. Determining the needed strategy according to function, economy, and occupant comfort and affordability is the crucial step. This book helps the reader to achieve a sustainable development without destruction of the resources while maintaining a growing universal awareness of protecting the living and non-living environment. Note de contenu : 1- Introductory chapter: Healthy and affordable housing strategies 2- Effects of street geometry on airflow regimes for natural ventilation in three different street configurations in Enugu City 3- Fundamentals of natural ventilation design within dwellings 4- Comprehensive strategy for sustainable housing design 5- Social innovation and environmental sustainability in social housing policies: Learning from two experimental case studies in Italy 6- Socioeconomic influences on affordable housing residents: Problem definition and possible solutions Numéro de notice : 28569 Affiliation des auteurs : non IGN Thématique : URBANISME Nature : Recueil / ouvrage collectif DOI : 10.5772/intechopen.77454 En ligne : https://doi.org/10.5772/intechopen.77454 Format de la ressource électronique : URL Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=97704

Study of the geometry effect on land surface temperature retrieval in urban environment / Jinxin Yanga in ISPRS Journal of photogrammetry and remote sensing, vol 109 (November 2015)  

Public [article]  inISPRS Journal of photogrammetry and remote sensing > vol 109 (November 2015) . - pp77 - 87 Titre : Study of the geometry effect on land surface temperature retrieval in urban environment Type de document : Article/Communication Auteurs : Jinxin Yanga, Auteur ; Man Sing Wong, Auteur ; Massimo Menenti, Auteur ; Janet Nichol, Auteur Année de publication : 2015 Article en page(s) : pp77 - 87 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications photogrammétriques [Termes IGN] canyon urbain [Termes IGN] exitance spectrale [Termes IGN] géométrie de l'image [Termes IGN] milieu urbain [Termes IGN] réflectance urbaine [Termes IGN] Split Window [Termes IGN] température au sol Résumé : (auteur) This study presents a Single Channel Method using Urban Exitance Model (UEM-SCM) to retrieve land surface temperature (LST) from satellite data in an urbanized city, and evaluates the geometry effect on land surface temperature retrieval using single channel method and split-window algorithm. The UEM-SCM incorporates the effect of urban geometry and considers both reflection caused by the target pixel and its neighboring pixels. In order to evaluate the geometry effect, the retrieved LSTs with and without geometry effect were studied. Results show that the LSTs without geometry effect are generally higher than the LSTs with geometry effect. The temperature difference occurs because the material emissivity is always lower than the effective emissivity caused by multiple scattering and reflection in urban areas (cavity effect). The LST without geometry effect also cannot fully capture the variability and complexity of urban thermal patterns. The temperature difference between with and without the geometry effect can reach 2 K in built-up areas. A comparison was also conducted between LST retrieved by split-window algorithm with and without geometry effect. Results show that the LST retrieved by split-window algorithm without geometry effect has generally higher values than the one with the geometry effect, e.g. 1.1 K on average and 1.5–2 K in built-up areas. The geometry effect will be removed and mis-deemed as atmospheric effect when the split-window algorithm without geometry effect is applied in urban areas. The split-window algorithm with the geometry effect can be used to distinguish between geometry and atmospheric effect in further study. Numéro de notice : A2015-859 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern En ligne : http://dx.doi.org/10.1016/j.isprsjprs.2015.09.001 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=79238 [article]

Street smart: 3-D city mapping and modeling for positioning with multi-GNSS / Li-Ta Hsu in GPS world, vol 26 n° 7 (July 2015)  

Public [article]  inGPS world > vol 26 n° 7 (July 2015) . - pp 36 - 43 Titre : Street smart: 3-D city mapping and modeling for positioning with multi-GNSS Type de document : Article/Communication Auteurs : Li-Ta Hsu, Auteur ; Shunsuke Miura, Auteur ; Shunsuke Kamijo, Auteur Année de publication : 2015 Article en page(s) : pp 36 - 43 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Navigation et positionnement [Termes IGN] canyon urbain [Termes IGN] coordonnées géographiques [Termes IGN] GNSS assisté pour la navigation [Termes IGN] modèle géométrique du bâti [Termes IGN] navigation pédestre [Termes IGN] positionnement par GNSS [Termes IGN] Quasi-Zenith Satellite System [Termes IGN] récepteur monofréquence [Termes IGN] réflexion spéculaire [Termes IGN] signal GLONASS [Termes IGN] signal GPS [Termes IGN] traitement du signal [Termes IGN] trajet multiple Résumé : (Auteur) A particle-filter positioning method using a 3D map to rectify the errors created by multipath and non-line-of-sight signals on the positioning result delivered by a low-cost single-frequency GPS receiver takes a multi-GNSS approach, using the combined signals of GPS, GLONASS and QZSS. The method outperforms conventional positioning in availablility and positioning accuracy. It wil likely fused with other sensors in a future pedestrian navigation application. Numéro de notice : A2015-308 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article DOI : sans En ligne : http://gpsworld.com/street-smart-3d-city-mapping-and-modeling-for-positioning-wi [...] Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=76532 [article]

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Collaborative signal processing: More receiver nodes brings ubiquitous navigation closer / Andrey Soloviev in GPS world, vol 25 n° 2 (February 2014)

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Urban positioning on a smartphone: real-time shadow matching using GNSS and 3D city models / Lei Wang in Inside GNSS, vol 8 n° 6 (November - December 2013) 

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Amélioration de la position GNSS en ville par la méthode des tranchées urbaines / M. Voyer in Géomatique expert, n° 93 (01/07/2013)

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Shadow detection in very high spatial resolution aerial images: A comparative study / Karine R.M. Adeline in ISPRS Journal of photogrammetry and remote sensing, vol 80 (June 2013)  

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MUSTER, a collaborative GNSS receiver architecture for weak signal processing / Andrey Soloviev in Inside GNSS, vol 8 n° 3 (May - June 2013)    

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GNSS inside mobile phones: GPS, GLONASS, QZSS and SBAS in a single chip / Franck Van Diggelen in Inside GNSS, vol 6 n° 2 (March - April 2011)  

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Dynamic duo: combined GPS/GLONASS receivers in urban environments / Cillian O'Driscoll in GPS world, vol 22 n° 1 (January 2011)

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Topographie et climatologie urbaine / G. Najjar in XYZ, n° 123 (juin - août 2010)

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Deploying a Locata network to enable precise positioning in urban canyons / J.P. Montillet in Journal of geodesy, vol 83 n° 2 (February 2009)

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Simulation du transfert radiatif en milieu urbain à l'aide du tracé de rayons / E. Gaillard (1999)

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