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instrument de mesureSynonyme(s)instrument de mesurage ;appareil de mesure appareil de mesurageVoir aussi |
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Performance of real-time precise point positioning / Junping Chen in Marine geodesy, vol 36 n° 1 (January - March 2013)
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Titre : Performance of real-time precise point positioning Type de document : Article/Communication Auteurs : Junping Chen, Auteur ; Haojun Li, Auteur ; Bin Wu, Auteur ; et al., Auteur Année de publication : 2013 Article en page(s) : pp 98 - 108 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Navigation et positionnement
[Termes IGN] horloge atomique
[Termes IGN] orbite
[Termes IGN] positionnement ponctuel précis
[Termes IGN] récepteur monofréquence
[Termes IGN] temps réelRésumé : (Auteur) The IGS Real-time Pilot Project (IGS-RTPP) provides real-time precise orbits and clocks, which support real-time positioning for single stations over large areas using the Precise Point Positioning (PPP) technique. This paper investigates the impact of real-time orbits, network configuration, and analysis strategies on real-time PPP implementation and demonstrates the real-time PPP performance. One month of data from the IGS network is analyzed in a real-time simulation mode. Results reveal the following: (1) In clock estimation, differential approaches are much more efficient than the zero-differenced approach. (2) The precision of IGS Ultra rapid (IGU) orbits could meet the IGS-RTPP requirement for precise clock estimation and PPP positioning. (3) Considering efficiency and precision, a network with 50 stations is recommended for the IGS-RTPP. It is demonstrated that the real-time satellite clock precision is 0.1 ns supporting hourly static PPP with a mean precision of 2–3 cm in the North component and 3–4 cm in the other components. Kinematic PPP assessed with onboard GPS data collected from a buoy provided mean coordinate precision of 2.2, 4.2, 6.1 cm in the North, East and Up directions, compared to the RTK solutions. Numéro de notice : A2013-248 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article DOI : 10.1080/01490419.2012.699503 Date de publication en ligne : 13/03/2013 En ligne : https://doi.org/10.1080/01490419.2012.699503 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=32386
in Marine geodesy > vol 36 n° 1 (January - March 2013) . - pp 98 - 108[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 230-2013011 RAB Revue Centre de documentation En réserve L003 Disponible
Titre : Time, atomics clocks and relativistic geodesy Type de document : Monographie Auteurs : Enrico Mai, Auteur Editeur : Munich : Bayerische Akademie der Wissenschaften Année de publication : 2013 Collection : DGK - A Sous-collection : Theoretische Geodäsie num. 124 Importance : 126 p. Format : 31 x 30 cm ISBN/ISSN/EAN : 978-3-7696-8204-5 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie physique
[Termes IGN] champ de pesanteur terrestre
[Termes IGN] horloge atomique
[Termes IGN] temps atomique international
[Termes IGN] temps de propagation
[Termes IGN] théorie de la relativitéIndex. décimale : 30.43 Travaux de géodésie physique Résumé : (Documentaliste) Après une première partie qui passé en revue les notions de temps, les effets de la relativité sont abordés. Puis l'auteur se focalise sur les problèmes de temps et de transfert de fréquence en géodésie spatiale concernés par la relativité. L'usage des horloges atomiques en géodésie nécessite un cadre mathématique particulier. Une approche de la géodésie relativiste est développée, elle établit par exemple, le concept de géoïde relativiste et introduit des réflexions en géodésie physique notamment. Note de contenu : Introduction
Time
1 The search for the nature of time
2 The measurement of time
3 The different notions of time
4 The problem of a unified concept of time
5 The role of fundamental quantities and physical dimensions
6 The realization of time scales
7 The choice of an underlying theory and its impact on definitions
8 The backing of a theory by experiments
9 The different kinds of geometry
10 The fundamental role of the line element
Relativistic Effects
11 Testing the concept of relativity
12 Focussing on Einstein's theory of relativity
13 Testing relativity via earthbound and space-bound experiments
14 Alternative modeling of gravitation
15 Progression of the interferometric method for relativity testing
16 Clocks as relativistic sensors
17 Apparent limits on the resolution
Transition to relativistic geodesy
18 Selected technological issues
19 Clock networks requiring time and frequency transfer
20 Time and frequency transfer via clock transportation
21 Time and frequency transfer via signal transmission
22 Time and frequency transfer methods
Geodetic use of atomic clocks
23 Decorrelation of physical effects by means of clock readings
24 From theoretical relativistic framework to real world scenarios
25 The resurrection of the chronometric leveling idea .
26 The improvement of gravity field determination techniques
27 Further potential applications of highly precise atomic clocks
28 The relativistic approach in satellite orbit calculation
Outline of the mathematical framework
29 Introduction of fundamental relations
29.1 Equation of a geodesic
29.2 Riemannian curvature tensor
29.3 Edtvos tensor and Marussi tensor
29.4 Ricci curvature tensor and fundamental metric tensors
29.5 Line element and special relativity
29.6 Proper time and generalized Doppler effect
29.7 Gravity and space-time metric
29.8 Einstein field equations
29.9 Special case: Schwarzschild metric and resulting testable relativistic effects
29.10 Inertial systems and general relativity
29.11 Geodesic deviation equation
29.12 Separability of different kinds of forces
29.13 Various relativistic effects
29.14 Proper time and gravitational time delay
29.15 Superposition and magnitude of individual relativistic effects
30 Essential expressions for relativistic geodesy
30.1 Specific relations between coordinate time and proper time
30.2 Problem-dependent fixing of the tensors
30.3 BK-approach vs DSX-approach
30.4 Celestial reference system connected to the (solar-system) barycenter
30.5 Celestial reference system connected to the geocenter
30.6 Classical spherical harmonics and relativistic multipole moments
30.7 Earth's metric potentials in relativistic mass and spin multipole moments
30.8 Transformation between global and local reference systems
30.9 External and tidal potentials in post-Newtonian approximation
30.10 Transformation between BCRS and GCRS
30.11 Remarks on various spin-related terms
30.12 Remarks on various kinds of mass-multipole moments
30.13 Gravitational potential knowledge and time transformation
30.14 Topocentric reference system connected to (earthbound) observation sites
30.15 Specific relations between geocentric time and proper time
30.16 Post-Newtonian gravimetry and gradiometry
30.17 Definition of a relativistic geoid
Clock based height determination
31 Practical time scales and their relations
32 Potential differences and classical height systems
33 The global vertical datum problem
34 Introductory remarks on the displacement of observation sites
35 Introductory remarks on tides and the tidal potential
36 The modeling of tides
37 Tidal displacement and the role of Love and Shida numbers
38 Details on the tidal potential and resulting displacements
39 Sensitivity of clocks to tidally induced potential differences
40 Sensitivity of clocks to the tidally induced Doppler effect
41 Concluding remarks on the comparison of clocks
Outlook ReferencesNuméro de notice : 15742 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Monographie Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=62767 Réservation
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Code-barres Cote Support Localisation Section Disponibilité 15742-01 30.43 Livre Centre de documentation Géodésie Disponible A 3-d laser scanning system and scan data processing method for the monitoring of tunnel deformations / K. Chmelina in Journal of applied geodesy, vol 6 n° 3-4 (November 2012)
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Titre : A 3-d laser scanning system and scan data processing method for the monitoring of tunnel deformations Type de document : Article/Communication Auteurs : K. Chmelina, Auteur ; J. Jansa, Auteur ; et al., Auteur Année de publication : 2012 Article en page(s) : pp 177 - 185 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications de géodésie spatiale
[Termes IGN] auscultation d'ouvrage
[Termes IGN] Autriche
[Termes IGN] caméra numérique
[Termes IGN] données localisées 3D
[Termes IGN] lever mobile
[Termes IGN] Lidar
[Termes IGN] réalité virtuelle
[Termes IGN] surveillance d'ouvrage
[Termes IGN] système de numérisation mobile
[Termes IGN] tachéomètre électronique
[Termes IGN] télémètre laser terrestre
[Termes IGN] tunnel
[Termes IGN] visualisation 3DRésumé : (Auteur) The paper presents the mobile multi-sensor system Orthos Plus for the monitoring and mapping of tunnel walls, a scan data processing method for the evaluation of 3-d tunnel wall displacements from subsequent wall scans and, finally, a virtual reality tool supporting the interpretation of data. The measuring system consists of a 3-d laser scanner, a motorised total station and a digital camera that are integrated on a light metal frame that is installed on a mobile platform. It has been designed to perform tunnel measurements most efficiently and to meet the special requirements of tunnels under construction. The evaluation of 3-d displacements is based on a 3-d matching algorithm that takes advantage of the particular conditions of tunnel (shotcrete) surfaces. The virtual reality tool allows viewing of data in a 3-d virtual reality tunnel model and their animation in time and space in order supports understanding in an optimal way. The measuring system Orthos Plus has been developed in the course of a national research project, the 3-d matching method in the frame of the Austrian Christian Doppler Laboratory Spatial Data from Laser Scanning and Remote Sensing and the VR tool in the Austrian COMET K1 Competence Center VRVis Center (www.vrvis.at). Numéro de notice : A2012-597 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article DOI : 10.1515/jag-2012-0013 En ligne : http://www.degruyter.com/view/j/jag.2012.6.issue-3-4/jag-2012-0013/jag-2012-0013 [...] Format de la ressource électronique : URL Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=32043
in Journal of applied geodesy > vol 6 n° 3-4 (November 2012) . - pp 177 - 185[article]Airborne lidar for natural environments: research and applications in France / C. Puech in Revue Française de Photogrammétrie et de Télédétection, n° 200 (Novembre 2012)
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Titre : Airborne lidar for natural environments: research and applications in France Type de document : Article/Communication Auteurs : C. Puech, Auteur ; Sylvie Durrieu, Auteur ; Jean-Stéphane Bailly, Auteur Année de publication : 2012 Article en page(s) : pp 54 - 68 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Lasergrammétrie
[Termes IGN] données lidar
[Termes IGN] données localisées 3D
[Termes IGN] géomorphologie
[Termes IGN] Lidar
[Termes IGN] lidar à retour d'onde complète
[Termes IGN] modèle numérique de surface
[Termes IGN] télémètre laser aéroporté
[Termes IGN] traitement du signal
[Termes IGN] végétationRésumé : (Auteur) This paper is a review of various research works in France on airborne LiDAR applied to the monitoring of natural environment. Firstly, it presents applications based on the use of very high-resolution digital surface models derived from LiDAR data. The use of such models is quickly expanding on all the fields related to the environment. This article also discusses more specific research on signal processing and accuracy. Part of this work summarizes papers that were published in the "Revue Française de Photogrammétrie et de Télédétection (RFPT)", the French Journal of Photogrammetry and Remote Sensing, following two national conferences organized in Montpellier (2006) and Le Mans (2009) in order to invite researchers using LiDAR in several fields of application to initiate technical and scientific exchanges. We also provide an update on ongoing research and instrument developments in France. Numéro de notice : A2012-568 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article DOI : 10.52638/rfpt.2012.62 Date de publication en ligne : 19/04/2014 En ligne : https://doi.org/10.52638/rfpt.2012.62 Format de la ressource électronique : URL Article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=32014
in Revue Française de Photogrammétrie et de Télédétection > n° 200 (Novembre 2012) . - pp 54 - 68[article]Estimating the uncertainty of terrestrial laser scanner measurements / M. Polo in IEEE Transactions on geoscience and remote sensing, vol 50 n° 11 Tome 2 (November 2012)
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Titre : Estimating the uncertainty of terrestrial laser scanner measurements Type de document : Article/Communication Auteurs : M. Polo, Auteur ; Ángel M. Felicísimo, Auteur ; A. Villanueva, Auteur ; J. Martinez-Del-Pozo, Auteur Année de publication : 2012 Article en page(s) : pp 4804 - 4808 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Lasergrammétrie
[Termes IGN] données lidar
[Termes IGN] données localisées 3D
[Termes IGN] estimation statistique
[Termes IGN] incertitude de mesurage
[Termes IGN] lidar topographique
[Termes IGN] précision des données
[Termes IGN] R (langage)
[Termes IGN] télémètre laser terrestreRésumé : (Auteur) At present, several papers discuss the accuracy and precision of terrestrial laser scanners (TLSs), but the research continues to focus on the behavior of the TLSs. The purpose of this paper is to propose a method to evaluate the uncertainty of a TLS (FARO Photon 80). A rigid and transportable aluminum structure with 28 black-and-white targets was designed for this purpose. The structure was scanned 12 times at several distances from 2 to 70 m, and the x, y, and z coordinates of the center of the targets were automatically identified. Data were analyzed by means of circular and spherical statistics using R modules programmed in our research group. Analysis reveals that 3-D spatial distribution has a stratified pattern in the Z-axis. Regardless of the scanner status, these results indicate that these analyses should be performed periodically because they can have an impact on some studies. The proposed methodology is robust and simple and can be performed with free software such as the R modules used in this work. Numéro de notice : A2012-592 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1109/TGRS.2012.2192481 Date de publication en ligne : 08/05/2012 En ligne : https://doi.org/10.1109/TGRS.2012.2192481 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=32038
in IEEE Transactions on geoscience and remote sensing > vol 50 n° 11 Tome 2 (November 2012) . - pp 4804 - 4808[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 065-2012111B RAB Revue Centre de documentation En réserve L003 Disponible Range camera self-calibration with scattering compensation / Derek D. Lichti in ISPRS Journal of photogrammetry and remote sensing, vol 74 (Novembrer 2012)
PermalinkThe electronically steerable flash Lidar : A full waveform scanning system for topographic and ecosystem structure applications / H. Duong in IEEE Transactions on geoscience and remote sensing, vol 50 n° 11 Tome 2 (November 2012)
PermalinkMulti-model validation of currents in the Chesapeake Bay region in June 2010 / P. Chu in Marine geodesy, vol 35 n° 4 (October - December 2012)
PermalinkLidar strip adjustment with automatically reconstructed roof shapes / M. Rentsch in Photogrammetric record, vol 27 n° 139 (September - November 2012)
PermalinkPermalinkLe nouveau pont de Ténérez : la topographie au service d'un défi technique / J. Monnerie in XYZ, n° 132 (septembre - novembre 2012)
PermalinkModeling atmospheric refraction influences by optical turbulences using an image-assisted total station / Alexander Reiterer in ZFV, Zeitschrift für Geodäsie, Geoinformation und Landmanagement, vol 137 n° 3 (01/06/2012)
PermalinkOn the detectability of synthetic disturbances in FG5 absolute gravimetry data using lomb-scargle analysis / M. Orlob in Geomatica, vol 66 n° 2 (June 2012)
PermalinkPermalinkMulti-wavelength canopy LiDAR for remote sensing of vegetation: Design and system performance / G. Wei in ISPRS Journal of photogrammetry and remote sensing, vol 69 (April 2012)
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