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Adaptive time-variant adjustment for the positioning errors of a mobile mapping platform in GNSS-hostile areas / Jiawei Han in Survey review, vol 49 n° 352 (March 2017)
[article]
Titre : Adaptive time-variant adjustment for the positioning errors of a mobile mapping platform in GNSS-hostile areas Type de document : Article/Communication Auteurs : Jiawei Han, Auteur ; C.P. Lo, Auteur Année de publication : 2017 Article en page(s) : pp 9 - 14 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie spatiale
[Termes IGN] couplage GNSS-INS
[Termes IGN] erreur de positionnement
[Termes IGN] GNSS assisté pour la navigation
[Termes IGN] occultation du signal
[Termes IGN] positionnement par GNSS
[Termes IGN] système de numérisation mobile
[Termes IGN] zone urbaine denseRésumé : (Auteur) A mobile mapping system (MMS) utilizes global navigation satellite system (GNSS) and inertial navigation system (INS) techniques and thus makes possible a direct geo-referencing solution everywhere along its surveyed path. It is capable of acquiring a vast amount of spatial information in an efficient manner and is adopted in a wide variety of applications. However, when the GNSS signal is obstructed, its positioning solution can only rely on the INS observables, which acquire significant and cumulative errors over time. In this study, an adaptive time-variant adjustment model is proposed to compensate for the MMS positioning error in a GNSS-hostile area using ground calibration points. Based on the results from a case study, it illustrates that the positioning error of a mobile mapping platform in an urban area for a long time could reach a level of several metres because of GNSS signal obstructions. However, this error can be properly modelled and significantly reduced to a centimetre-level when the proposed approach is applied. Consequently, both the efficiency and reliability of the MMS applications in a GNSS hostile environment can be further guaranteed. Numéro de notice : A2017-057 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article DOI : 10.1080/00396265.2015.1104091 En ligne : https://doi.org/10.1080/00396265.2015.1104091 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=84265
in Survey review > vol 49 n° 352 (March 2017) . - pp 9 - 14[article]Matching plot-level tree maps with 3D remote sensing data for assessing and estimating forest parameters / Cédric Vega (2017)
Titre : Matching plot-level tree maps with 3D remote sensing data for assessing and estimating forest parameters Type de document : Article/Communication Auteurs : Cédric Vega , Auteur ; Maryem Fadili , Auteur Editeur : Saint-Mandé : Institut national de l'information géographique et forestière - IGN (2012-) Année de publication : 2017 Conférence : SilviLaser 2017, 15th conference on Lidar Applications for Assessing and Managing Forest Ecosystems 10/10/2017 12/10/2017 Blacksburg Virginie - Etats-Unis OA Abstracts only Langues : Anglais (eng) Descripteur : [Termes IGN] appariement de données localisées
[Termes IGN] erreur de positionnement
[Termes IGN] inventaire forestier (techniques et méthodes)
[Termes IGN] modèle numérique de surface de la canopée
[Termes IGN] programmation par contraintes
[Termes IGN] structure d'un peuplement forestier
[Vedettes matières IGN] Inventaire forestierRésumé : (auteur) 3D remote sensing data from either Lidar or Photogrammetric means are recognized as valuable sources of information for assessing and estimating forest structure and related parameters. Both data types have been used with field inventory data for both mapping forest parameters and supporting multisource inventories. However, such a combination requires the data to be accurately matched in the spatial domain. While 3D remote sensing data might provide metric accuracy, the spatial accuracy of field plots remain largely constrained by the limited precision of GPS measurements under forest canopies. Different approaches have been proposed to improve this data registration issue, mainly through matching algorithms aiming to spatially adjust height information from field inventory with remote sensing-based models of canopy heights (CHM). State of the art approaches rely on either point to surface or point to point matching algorithms. However, the former did not make any hypothesis on the tree position on the CHM and could lead to inappropriate match. And the later relies on strong assumptions on the spatial distribution of trees and are thus sensitive to the quality of the tree apices detected on the CHM. We propose an algorithm taking advantage of both approaches. The algorithm is based on a point to surface matching algorithm constraints by local maxima (LM) extracted from the CHM. A search algorithm moved the field tree map in a given neighborhood, ensuring that the highest field tree is located over a LM. The best position is defined using both the correlation and the height error. The algorithm was tested on 91 plots including different forest types and a range of forest structure. Initial positions were shifted in average by 2.18 m (±1.95 m SD) and led to an average error of 1.61 m (±1.07 m). The higher the tree number, the better the registration. Numéro de notice : C2017-061 Affiliation des auteurs : LIF (2012-2019) Thématique : FORET/MATHEMATIQUE Nature : Communication nature-HAL : ComSansActesPubliés-Unpublished DOI : sans Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=99224
Titre : Understanding GPS/GNSS : principles and applications Type de document : Monographie Auteurs : Elliott D. Kaplan, Éditeur scientifique ; Christopher Hegarty, Éditeur scientifique Mention d'édition : Third edition Editeur : Londres, Washington : Artech House Année de publication : 2017 Collection : GNSS Technology and applications series Importance : 993 p. Format : 18 x 26 cm ISBN/ISSN/EAN : 978-1-63081-058-0 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie spatiale
[Termes IGN] BeiDou
[Termes IGN] erreur de positionnement
[Termes IGN] Galileo
[Termes IGN] Global Orbitography Navigation Satellite System
[Termes IGN] Global Positioning System
[Termes IGN] GNSS en mode différentiel
[Termes IGN] mesurage par GNSS
[Termes IGN] positionnement ponctuel précis
[Termes IGN] récepteur GNSSIndex. décimale : 30.61 Systèmes de Positionnement par Satellites du GNSS Résumé : (Editeur) This updated third edition provides a current and comprehensive treatment of global navigation satellite systems (GNSS) and includes new chapters on the system engineering details of GPS, European Galileo system, Chinese Beidou systems, GLONASS, and regional systems. The book contains material on the system engineering details of GPS, European Galileo system, Chinese Beidou systems, GLONASS, Quasi-Zenith Satellite System (QZSS) and Navigation with Indian Constellation (NavIC) and investigates the integration of GNSS with other sensors and network assistance. Numéro de notice : 26395 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Recueil / ouvrage collectif Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=96084 Réservation
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Table des matières Understanding GPS/GNSS... - pdf éditeurAdobe Acrobat PDF Plot location errors of National Forest Inventory: related factors and adverse effects on continuity of plot data / Haruki Nakajima in Journal of Forest Research, vol 21 n° 6 (December 2016)
[article]
Titre : Plot location errors of National Forest Inventory: related factors and adverse effects on continuity of plot data Type de document : Article/Communication Auteurs : Haruki Nakajima, Auteur Année de publication : 2016 Article en page(s) : pp 300 - 305 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Termes IGN] disponibilité des données
[Termes IGN] erreur de positionnement
[Termes IGN] inventaire forestier étranger (données)
[Termes IGN] Japon
[Termes IGN] placette d'échantillonnage
[Termes IGN] positionnement par GPS
[Vedettes matières IGN] Inventaire forestierRésumé : (auteur) Plot location errors (distance between recorded and true coordinates) of National Forest Inventory (NFI) cause a mismatch between plot data and remotely sensed data and might prevent re-measurement because plots with large location errors are hard to find. However, few studies have examined the detailed distribution of errors and related factors, and no studies have verified whether the large errors prevent re-measurement. This study analyzed data related to 101 plots in central Japan that had been established by the First NFI (1999–2003) on a 4-km grid. Plot location errors of these plots were measured by revisiting. Selective Availability (SA) of the Global Positioning System, which degraded location accuracy until May 2000, was the most important factor in increasing plot location errors. The mean errors were 58.6 and 15.0 m, with and without SA, respectively. In 12 plots with large plot location errors (the mean error was 84.6 m), re-measurement in the Second NFI (2004–2008) was not conducted because plot locations could not be found. In these situations, alternative new plots were established; however, their species compositions were significantly different from the initial NFI plots. Plot location errors of NFI adversely affect the continuity of plot data as well as the analysis with remotely sensed data. Numéro de notice : A2016--074 Affiliation des auteurs : non IGN Thématique : FORET Nature : Article DOI : 10.1007/s10310-016-0538-1 Date de publication en ligne : 18/08/2016 En ligne : https://doi.org/10.1007/s10310-016-0538-1 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=84444
in Journal of Forest Research > vol 21 n° 6 (December 2016) . - pp 300 - 305[article]Precise point positioning model using triple GNSS constellations: GPS, Galileo and BeiDou / Akram Afifi in Journal of applied geodesy, vol 10 n° 4 (December 2016)
[article]
Titre : Precise point positioning model using triple GNSS constellations: GPS, Galileo and BeiDou Type de document : Article/Communication Auteurs : Akram Afifi, Auteur ; Ahmed El-Rabbany, Auteur Année de publication : 2016 Article en page(s) : pp 223 – 232 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie spatiale
[Termes IGN] erreur de positionnement
[Termes IGN] erreur systématique
[Termes IGN] milieu urbain
[Termes IGN] modèle mathématique
[Termes IGN] positionnement par BeiDou
[Termes IGN] positionnement par Galileo
[Termes IGN] positionnement par GNSS
[Termes IGN] positionnement par GPS
[Termes IGN] positionnement ponctuel précis
[Termes IGN] récepteur bifréquence
[Termes IGN] temps réelRésumé : (auteur) This paper introduces a comparison between dual-frequency precise point positioning (PPP) post-processing model, which combines the observations of three different GNSS constellations, namely GPS, Galileo, and BeiDou and real-time PPP model. A drawback of a single GNSS system such as GPS, however, is the availability of sufficient number of visible satellites in urban areas. Combining GNSS observations offers more visible satellites to users, which in turn is expected to enhance the satellite geometry and the overall positioning solution. However, combining several GNSS observables introduces additional biases, which require rigorous modelling, including the GNSS time offsets and hardware delays. In this paper, a GNSS post-processing PPPP model is developed using ionosphere-free linear combination. The additional biases of the GPS, Galileo, and BeiDou combination are accounted for through the introduction of a new unknown parameter, which is identified as the inter-system bias, in the PPP mathematical model. Natural Resources Canada’s GPSPace PPP software is modified to enable a combined GPS / Galileo / BeiDou PPP solution and to handle the newly inter-system bias. A total of four data sets at four IGS stations are processed to verify the developed PPP model. Precise satellite orbit and clock products from the IGS-MGEX network are used to correct of the GPS, Galileo and BeiDou measurements. For the real-time PPP model the corrections of the satellites orbit and clock are obtained through the international GNSS service (IGS) real-time service (RTS). GPS and Galileo Observations are used for the GNSS RTS-IGS PPP model as the RTS-IGS satellite products are not available for BeiDou satellites. This paper provides the GNSS RTS-IGS PPP model using different satellite clock corrections namely: IGS01, IGC01, IGS01, and IGS03. All PPP models results of convergence time and positioning precision are compared to the traditional GPS-only PPP model. It is shown that combining GPS, Galileo, and BeiDou observations in a PPP model reduces the convergence time by 25 % compared with the GPS-only PPP model. Numéro de notice : A2016-974 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article DOI : 10.1515/jag-2016-0010 En ligne : https://doi.org/10.1515/jag-2016-0010 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=83681
in Journal of applied geodesy > vol 10 n° 4 (December 2016) . - pp 223 – 232[article]Les forêts, une affaire de professionnels / Michel Padel in Géomètre, n° 2140 (octobre 2016)PermalinkModeling the effects of horizontal positional error on classification accuracy statistics / Henry B. Glick in Photogrammetric Engineering & Remote Sensing, PERS, vol 82 n° 10 (October 2016)PermalinkThe influence of elliptical Gaussian laser beam on inversion of terrain information for satellite laser altimeter / Zhou Hui in Photogrammetric Engineering & Remote Sensing, PERS, vol 82 n° 10 (October 2016)PermalinkA measure of average error variance of line features / Eryong Liu in Cartography and Geographic Information Science, Vol 43 n° 4 (September 2016)PermalinkCorrection of atmospheric refraction geolocation error for high resolution optical satellite pushbroom images / Ming Yan in Photogrammetric Engineering & Remote Sensing, PERS, vol 82 n° 6 (June 2016)PermalinkAssessing the planimetric accuracy of historical maps (sixteenth to nineteenth centuries): new methods and potential for coastal landscape reconstruction / Iason Jongepier in Cartographic journal (the), Vol 53 n° 2 (May 2016)PermalinkPermalinkPermalinkUsing international standards to control the positional quality of spatial data / Francisco Javier Ariza-López in Photogrammetric Engineering & Remote Sensing, PERS, vol 81 n° 8 (August 2015)PermalinkDétermination de la précision planimétrique des images Google Earth haute résolution de Rome (1ère partie) / Guiseppe Pulighe in Géomatique expert, n° 104 (mai - juin 2015)PermalinkPhotogrammetric techniques and surveying applied to historical map analysis / C. San-Antonio-Gómez in Survey review, vol 47 n° 341 (March 2015)PermalinkSpatio-temporal filtering for determination of common mode error in regional GNSS networks / Janusz Bogusz in Open geosciences, vol 7 n° 1 (January 2015)PermalinkEmpirical modelling of site-specific errors in continuous GPS data / Michael Moore in Journal of geodesy, vol 88 n° 9 (September 2014)PermalinkRobust position information system for e-navigation : Bayesian pool of errors / Thomas Buret in Navigation aérienne, maritime, spatiale, terrestre, vol 62 n° 243 (janvier 2014)PermalinkEffects of national forest inventory plot location error on forest carbon stock estimation using k-nearest neighbor algorithm / Jaehoon Jung in ISPRS Journal of photogrammetry and remote sensing, vol 81 (July 2013)PermalinkMapping GPS positional errors using spatial linear mixed models / A.F. Militino in Journal of geodesy, vol 87 n° 7 (July 2013)PermalinkThe island that never was / Tim Thornton in GEO: Geoconnexion international, vol 12 n° 7 (july - august 2013)PermalinkAnalytical error analysis for satellite gravity field determination based on two-dimensional Fourier method / Lin Cai in Journal of geodesy, vol 87 n° 5 (May 2013)PermalinkPermalinkRevision of survey results of control points after the 2011 off the Pacific coast of Tohoku earthquake / Y. Hiyama in Bulletin of the GeoSpatial Information authority of Japan, vol 59 (December 2011)Permalink