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Adjustment options for a survey network with magnetic levitation gyro data in an immersed under-sea tunnel / Ji Ma in Survey review, vol 51 n° 367 (July 2019)  

Public [article]  inSurvey review > vol 51 n° 367 (July 2019) . - pp 373 - 386 Titre : Adjustment options for a survey network with magnetic levitation gyro data in an immersed under-sea tunnel Type de document : Article/Communication Auteurs : Ji Ma, Auteur ; Zhiqiang Yang, Auteur ; Zhen Shi, Auteur ; et al., Auteur Année de publication : 2019 Article en page(s) : pp 373 - 386 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Topographie [Termes descripteurs IGN] azimut gyroscopique [Termes descripteurs IGN] compensation de coordonnées [Termes descripteurs IGN] lever souterrain [Termes descripteurs IGN] réseau géodésique spécifique [Termes descripteurs IGN] tunnel Résumé : (Auteur) Since gyro azimuths are affected by the complex environmental factors that are present in underground spaces, the adjustment model should take this into account. In general, gyro azimuths are considered to be errorless or equal precision observations in the adjustment model, which leads to the overestimation or underestimation of the weight of the gyro azimuths. To improve the precision of underground networks, measured with a magnetic levitation gyroscope, an adjustment for the survey network with individually weighted gyro observations is proposed. The proposed method was tested on an equivalent mock-up network of the tunnels associated with the Hong Kong-Zhuhai-Macau Bridge. The lateral breakthrough error and lateral standard deviation at the breakthrough point were calculated and compared. Our result shows that the lateral breakthrough error was 4.8 mm with the precision change ratio of 64.5% which suggested that the proposed method is able to improve the precision of the breakthrough point. Numéro de notice : A2019-365 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1080/00396265.2018.1563376 date de publication en ligne : 03/01/2019 En ligne : https://doi.org/10.1080/00396265.2018.1563376 Format de la ressource électronique : URL Article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=93454 [article]

Point clouds by SLAM-based mobile mapping systems: accuracy and geometric content validation in multisensor survey and stand-alone acquisition / Giulia Sammartano in Applied geomatics, vol 10 n° 4 (December 2018)  

Public [article]  inApplied geomatics > vol 10 n° 4 (December 2018) . - pp 317 - 339 Titre : Point clouds by SLAM-based mobile mapping systems: accuracy and geometric content validation in multisensor survey and stand-alone acquisition Type de document : Article/Communication Auteurs : Giulia Sammartano, Auteur ; Antonia Spanò, Auteur Année de publication : 2018 Article en page(s) : pp 317 - 339 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications photogrammétriques [Termes descripteurs IGN] analyse comparative [Termes descripteurs IGN] carte d'intérieur [Termes descripteurs IGN] cartographie 3D [Termes descripteurs IGN] données localisées 3D [Termes descripteurs IGN] intégration de données [Termes descripteurs IGN] lever souterrain [Termes descripteurs IGN] modèle 3D du site [Termes descripteurs IGN] patrimoine culturel [Termes descripteurs IGN] patrimoine immobilier [Termes descripteurs IGN] semis de points [Termes descripteurs IGN] Simultaneous Localisation And Mapping Résumé : (Auteur) The paper provides some operative replies to evaluate the effectiveness and the critical issues of the simultaneous localisation and mapping (SLAM)-based mobile mapping system (MMS) called ZEB by GeoSLAM™ https://geoslam.com/technology/. In these last years, this type of handheld 3D mapping technology has increasingly developed the framework of portable solutions for close-range mapping systems that have mainly been devoted to mapping the indoor building spaces of enclosed or underground environments, such as forestry applications and tunnels or mines. The research introduces a set of test datasets related to the documentation of landscape contexts or the 3D modelling of architectural complexes. These datasets are used to validate the accuracy and informative content richness about ZEB point clouds in stand-alone solutions and in cases of combined applications of this technology with multisensor survey approaches. In detail, the proposed validation method follows the fulfilment of the endorsed approach by use of root mean square error (RMSE) evaluation and deviation analysis assessment of point clouds between SLAM-based data and 3D point cloud surfaces computed by more precise measurement methods to evaluate the accuracy of the proposed approach. Furthermore, this study specifies the suitable scale for possible handlings about these peculiar point clouds and uses the profile extraction method in addition to feature analyses such as corner and plane deviation analysis of architectural elements. Finally, because of the experiences reported in the literature and performed in this work, a possible reversal is suggested. If in the 2000s, most studies focused on intelligently reducing the light detection and ranging (LiDAR) point clouds where they presented redundant and not useful information, contrariwise, in this sense, the use of MMS methods is proposed to be firstly considered and then to increase the information only wherever needed with more accurate high-scale methods. Numéro de notice : A2018-590 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1007/s12518-018-0221-7 date de publication en ligne : 01/06/2018 En ligne : https://doi.org/10.1007/s12518-018-0221-7 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=92514 [article]

Going underground / Erik Dahlberg in GEO: Geoconnexion international, vol 16 n° 9 (September 2017)

Public [article]  inGEO: Geoconnexion international > vol 16 n° 9 (September 2017) . - pp 50 - 52 Titre : Going underground Type de document : Article/Communication Auteurs : Erik Dahlberg, Auteur Année de publication : 2017 Article en page(s) : pp 50 - 52 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Topographie moderne [Termes descripteurs IGN] canalisation [Termes descripteurs IGN] lever souterrain [Termes descripteurs IGN] réseau technique souterrain Résumé : (éditeur) There are more than three million kilometres of gas pipelines in the US. Except no one’s sure where they all are. Erik Dahlberg reports on new technology being used to locate underground pipelines – without massive excavation projects Numéro de notice : A2017-424 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=86321 [article]

Use of the gyrotheodolite in underground networks of long high-speed railway tunnels / J. Velasco-Gómez, in Survey review, vol 48 n° 350 (September 2016)  

Public [article]  inSurvey review > vol 48 n° 350 (September 2016) . - pp 329 - 337 Titre : Use of the gyrotheodolite in underground networks of long high-speed railway tunnels Type de document : Article/Communication Auteurs : J. Velasco-Gómez,, Auteur ; J. F. Prieto, Auteur ; I. Molina, Auteur ; et al., Auteur Année de publication : 2016 Article en page(s) : pp 329 - 337 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Navigation et positionnement [Termes descripteurs IGN] déviation de la verticale [Termes descripteurs IGN] Espagne [Termes descripteurs IGN] géoïde [Termes descripteurs IGN] guidage de forage [Termes descripteurs IGN] guidage de véhicules [Termes descripteurs IGN] gyrothéodolite [Termes descripteurs IGN] lever souterrain [Termes descripteurs IGN] tunnel [Termes descripteurs IGN] voie ferrée Résumé : (auteur) The quality of geodetic networks for guiding Tunnel Boring Machines (TBMs) inside long tunnels depends largely on the correct use of a gyroscope. These networks are based on a series of control points at the tunnel entrance, and link each station by means of survey observations as they advance along the tunnel. Once, the networks are used to guide the TBM, they are no longer checked again. It is necessary to perform high accuracy astronomical observations to stars in order to determine the gyrotheodolite constant. Since astronomical observations cannot be made inside tunnels, geodetic azimuths have to be used for the computations. However, these azimuths cannot theoretically be compared with the astronomical azimuths obtained by the gyrotheodolite. An alternative is to compute the instrument constant using the values of the deviation of the vertical derived from a geoid model. That is the approach used in this work where a methodology for the design of underground networks in long tunnels is also presented. This procedure has been implemented during the construction of the Guadarrama and Pajares high-speed railway tunnels (Spain). Numéro de notice : A2016-640 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article DOI : 10.1179/1752270615Y.0000000043 En ligne : https://doi.org/10.1179/1752270615Y.0000000043 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=81845 [article]

Underground incrementally deployed magneto-inductive 3-D positioning network / Traian E. Abrudan in IEEE Transactions on geoscience and remote sensing, vol 54 n° 8 (August 2016)  

Public [article]  inIEEE Transactions on geoscience and remote sensing > vol 54 n° 8 (August 2016) . - pp 4376 - 4391 Titre : Underground incrementally deployed magneto-inductive 3-D positioning network Type de document : Article/Communication Auteurs : Traian E. Abrudan, Auteur ; Zhuoling Xiao, Auteur ; Andrew Markham, Auteur ; Niki Trigoni, Auteur Année de publication : 2016 Article en page(s) : pp 4376 - 4391 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Topographie moderne [Termes descripteurs IGN] itération [Termes descripteurs IGN] lever souterrain [Termes descripteurs IGN] mine [Termes descripteurs IGN] positionnement en intérieur [Termes descripteurs IGN] précision des données [Termes descripteurs IGN] sous-sol Résumé : (Auteur) Underground mines are characterized by a network of intersecting tunnels and sharp turns, an environment which is particularly challenging for radiofrequency based positioning systems due to extreme multipath, non-line-of-sight propagation, and poor anchor geometry. Such systems typically require a dense grid of devices to enable 3-D positioning. Moreover, the precise position of each anchor node needs to be precisely surveyed, a particularly challenging task in underground environments. Magneto-inductive (MI) positioning, which provides 3-D position and orientation from a single transmitter and penetrates thick layers of soil and rock without loss, is a more promising approach, but so far has only been investigated in simple point-to-point contexts. In this paper, we develop a novel MI positioning approach to cover an extended underground 3-D space with unknown geometry using a rapidly deployable anchor network. The key to our approach is that the position of only a single anchor needs to be accurately surveyed-the positions of all secondary anchors are determined using an iterative refinement process using measurements obtained from receivers within the network. This avoids the particularly challenging and time-intensive task in an underground environment of accurately surveying the positions of all of the transmitters. We also demonstrate how measurements obtained from multiple transmitters can be fused to improve localization accuracy. We validate the proposed approach in a man-made cave and show that, with a portable system that took 5 min to deploy, we were able to provide accurate through-the-earth location capability to nodes placed along a suite of tunnels. Numéro de notice : A2016-883 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article nature-HAL : ArtAvecCL-RevueIntern En ligne : http://dx.doi.org/10.1109/TGRS.2016.2540722 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=83047 [article]

Multi-sensor cave detection / Tanya Slavova in GIM international [en ligne], vol 30 n° 3 (March 2016)

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Proposed design of local 2D geodetic network for the construction of the tunnel part of the Belgrade metro / Marija Savanović, in Geodetski vestnik, vol 59 n° 3 (September - November 2015)  

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Retrieving three-dimensional displacement fields of mining areas from a single InSAR pair / Zhi Wei Li in Journal of geodesy, vol 89 n° 1 (January 2015)  

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Underground revolution / Otto Ballintijn in GEO: Geoconnexion international, vol 14 n° 1 (January 2015)

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Déterminations topographiques en milieu noyé / Paul Courbon in XYZ, n° 137 (décembre 2013 - février 2014) 

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Le projet Deep City : vers un urbanisme tridimensionnel / A. Parriaux in XYZ, n° 132 (septembre - novembre 2012)

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L'enseignement de la topographie souterraine à Paris (partie 1/2) / G. Thomas in XYZ, n° 130 (mars - mai 2012)

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GNSS rapidly gains ground / R. Van Santen in GIM international, vol 25 n° 10 (October 2011)

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Non-contact 3D measurement of buildings through close range photogrammetry and a laser distance meter / J. Martinez in Photogrammetric Engineering & Remote Sensing, PERS, vol 77 n° 8 (August 2011)  

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Géoréférencement des réseaux enterrés : des techniques de relevé à la gestion d’un cadastre du sous-sol / G. Cornette in XYZ, n° 127 (juin - août 2011)

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