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Titre : Ionospheric modeling for precise GNSS applications Type de document : Thèse/HDR Auteurs : Yahya Memarzadeh, Auteur Editeur : Delft : Netherlands Geodetic Commission NGC Année de publication : 2009 Collection : Netherlands Geodetic Commission Publications on Geodesy, ISSN 0165-1706 num. 71 Importance : 208 p. Format : 17 x 24 cm ISBN/ISSN/EAN : 978-90-6132-314-3 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie spatiale
[Termes IGN] antenne GNSS
[Termes IGN] correction ionosphérique
[Termes IGN] double différence
[Termes IGN] modèle ionosphérique
[Termes IGN] positionnement différentiel
[Termes IGN] positionnement par GNSS
[Termes IGN] précision centimétrique
[Termes IGN] propagation du signal
[Termes IGN] propagation ionosphérique
[Termes IGN] simple différence
[Termes IGN] temps réel
[Termes IGN] teneur totale en électrons
[Termes IGN] traitement de données GNSSIndex. décimale : 30.61 Systèmes de Positionnement par Satellites du GNSS Résumé : (Auteur) The main objective of this thesis is to develop a procedure for modeling and predicting ionospheric Total Electron Content (TEC) for high precision differential GNSS applications. As the ionosphere is a highly dynamic medium, we believe that to have a reliable procedure it is necessary to transfer the high temporal resolution GNSS network data into the spatial domain. This objective led to the development of a recursive physics-based model for the regular TEC variations and an algorithm for real-time modeling of the medium-scale Traveling Ionospheric Disturbances (MS-TID). The research described in this thesis can roughly be divided into three parts.
The main application of these developments can be found in Network RTK. Network-RTK is a technique based on a network of reference receivers to provide cm-level positioning accuracy in real time for users in the field. To get centimeter accuracy after a short (minutes) initialization period the ionospheric delay for the user's receiver needs to be predicted very precisely between the ionospheric pierce points of the reference receivers at the double difference level. Having the cm-level accuracy in the ionospheric interpolation is crucial for the carrier phase ambiguity resolution by the user. To achieve high precision in the ionospheric interpolation, regular and irregular variability of TEC in time and space should be taken into account. The regular TEC variation, which can reach several hundreds TEC units, is mainly a function of solar zenith angle. The irregular (or non-repeatable) variations are mainly wavelike effects associated with Traveling Ionospheric Disturbances (TID).
Although TID effects on the TEC are of the order of 0.1 TEC unit, MS-TIDs, with a typical wavelength less than a few hundred kilometers, is one of the main obstacles for accurate spatial interpolation of ionospheric induced delays in a medium-scale reference GPS network. Since most of interpolation methods either use spatial linear (or quadratic) interpolation or fit a lower-order surface, the methods are not capable to model the phase-offset, caused by MS-TIDs, at distinct ionospheric pierce points. There are two major complications. Firstly, interpolation must be done at the double-difference level, which involves taking single differences between ionospheric delays for the same satellite between two different receivers, followed by differencing single differences for different satellites. This means that two different patches of the ionosphere are involved, each related to a different satellite, and each possibly associated with different TIDs. Secondly, for operational network RTK, a real-time strategy for TID detection and modeling is needed.
In the first part the performance of several empirical ionosphere models for the regular TEC variation, such as Klobuchar, NeQuick, and the IGS Global Ionosphere Maps (GIM) are studied in the mid-latitude region using GPS data. Our results show that the GIM was able to correct the absolute slant ionospheric delay to better than 80% under different geomagnetic conditions of the ionosphere. The NeQuick model, which performed better than the Klobuchar model, could correct about 60% of the slant ionospheric delay. NeQuick is a real-time ionospheric correction model for the future European Galileo navigation system. A key input parameter for NeQuick is the effective ionization parameter (Az), which will be provided as a second order polynomial in the Galileo broadcast message to single-frequency users. The coefficients of the polynomial will be estimated daily from at least 20 permanent Galileo monitoring stations. As Galileo is under development, we propose an alternative approach for estimating Az using Global Ionospheric Maps (GIM). The main advantages of the alternative approach over the standard approach are: (1) the alternative approach is more reliable, because, each IGS GIM is based on data of up to 300 GNSS stations world-wide and each IGS GIM is the combination of results of up to four analysis centers, (2) the coefficients are more representative for all regions on the world because they are computed from a world-wide grid instead of about 20 distinct locations, (3) with the alternative procedure it is possible to provide Az in a different representation, for instance using a higher order polynomial, grid, or other function types, and (4) the computational effort is much smaller assuming the IGS GIMs have already been computed.
In the second part a normal ionosphere is defined using Chapman's ion production theory to approximate the regular variability of the Earth's ionosphere. The normal ionosphere consists of lower and upper region. The lower region is formed in a photochemical equilibrium resulting in a Chapman layer. The upper region is formed in a diffusive equilibrium, whilst ignoring the geomagnetic field, resulting in a new Chapman like ionospheric layer. Integration of the continuity equation of the normal ionosphere over height leads to a Boundary Value Problem (BVP) for the temporal evolution of VTEC. Solution of the BVP results in a novel recursive model for the regular TEC variation as a function of solar zenith angle. The main motivation for developing this model is that the empirical models of the first part were either ill-suited or too complicated to model and predict the regular variation of TEC for high precision differential GNSS applications. The performance of the new model is tested at local and global scales using GIM. In general, despite the geomagnetic field was ignored, the cases analyzed show that the model gives a good overall representation of the regular variation of VTEC in the mid-latitude region under a geomagnetically quiet ionosphere. This is an important result that shows the potential of the model for a number of applications. Since the model has a recursive form it is ideally suited to use as time update equation in a dynamic data processing or Kalman filter. Another application is to use it for removing the geometry-dependent trend from time series of GPS-provided ionospheric delays to provide a pure TID observation, which is carried out in the third part of this thesis.
In the third part, a new algorithm for the real-time detection and modeling of MS-TID effects is developed. In order to eliminate effects from large-scale TIDs, the algorithm uses between-receiver single-difference (SD) ionospheric delays in a medium scale GPS network. Although single-differencing also eliminates to some extend the geometry-dependent trend, the remaining part cannot be neglected. In this thesis, we fit the SD data to the recursive model which was developed in the second part of the thesis. Any wavelike fluctuations in the data with respect to the model are assumed to be from MS-TID effects. The detrended SD data are the main input of the algorithm. The algorithm consists of six steps: initialization, detection, scraping, cross-correlation, parameter estimation, and ending. A MS-TID is assumed to be a planar longitudinal traveling wave with spatially independent amplitude that propagates in an ionospheric patch. All characteristic parameters of the MS-TID wave (e.g. period, phase velocity, propagation direction, and amplitude) are considered to be time dependent, while the Doppler-shift caused by the satellite motion is taken into account in the estimation step. The performance of the algorithm is tested with GPS data from a network. Although real TIDs are not perfect waves, the algorithm was able to model (in time and in space) the MS-TID to a large extend. The performance was found to be comparable with the Kriging interpolation method. This is an important first result, in part because these two methods are based on different principles, but also because there is still room for improvement in our algorithm. With our physics based model it is possible to avoid the planar wave approximation and take the phase-offset of the wave into account, something which is not possible with Kriging.Note de contenu : Curriculum Vitae Acknowledgments Notation and Symbols Acronyms
1 Introduction
1.1 Background
1.2 Research objectives
1.3 Outline of the thesis
1.4 Contributions of this research
2 The Earth's Atmosphere, Sun, and Geomagnetism
2.1 The Earth's Atmosphere .
2.1.1 Pressure, temperature and density variations
2.1.2 Diffusive equilibrium
2.1.3 Upper atmosphere .
2.2 The Sun
2.2.1 The Solar radiation
2.2.2 Variation of the radiation intensity
2.2.3 Solar radiations index (F10.7) .
2.3 Geomagnetism .
2.3.1 The earth's magnetic dipole field
2.3.2 The real geomagnetic field
2.3.3 Geomagnetic storm
2.3.4 Geomagnetic indices
3 Physics of the Earth's Ionosphere
3.1 Interaction of solar radiation with the Earth's upper atmosphere
3.2 Ionosphere formation theory
3.2.1 Plasma continuity equation
3.2.2 Ion production
3.2.3 Ion and electron disappearance .
3.2.4 Chapman layer
3.3 Transport process in the ionosphere .
3.3.1 Charged particle motion in a magnetic field .
3.3.2 Plasma diffusion .
3.3.3 Thermospheric wind .
3.3.4 Electromagnetic drift
3.4 Ionospheric stratification .
3.4.1 The D-Region
3.4.2 The E-Region
3.4.3 The F-Region
3.4.4 The topside region and the protonosphere .
3.4.5 Vertical electron density profile of the ionosphere
3.4.6 Characteristic parameters of the ionospheric regions
3.5 Spatial and temporal variability of the ionosphere
3.5.1 Regular variations
3.5.2 Geomagnetic regions .
3.6 Solar disturbances
3.6.1 Ionospheric disturbances .
3.6.2 Atmospheric gravity waves
3.6.3 Traveling ionospheric disturbances
4 Ionospheric delay measured from GNSS
4.1 Global Navigation Satellite Systems (GNSS) .
4.2 GNSS observation equations
4.2.1 Code or pseudo-range observation equation
4.2.2 Carrier beat phase observation equation
4.2.3 Simplifications of the observation equations
4.2.4 Tropospheric effects
4.3 Ionospheric propagation of GNSS signals .
4.3.1 Inhomogeneity of the ionosphere .
4.3.2 Dispersivity of the ionosphere .
4.3.3 Anisotropy of the ionosphere .
4.3.4 Ionospheric refractive index
4.3.5 Ionospheric first-, higher-order and bending effects . .
4.4 Ionospheric Total Electron Content (TEC)
4.4.1 A single-layer ionosphere approximation
4.4.2 Approximation of the higher-order and bending effects
4.5 Ionospheric models
4.5.1 Klobuchar model
4.5.2 Global Ionosphere Maps
4.6 Slant ionospheric delay measurements from GNSS
4.6.1 Network processing
4.6.2 Geometry-free linear combination 4.7 Summary
5 NeQuick 3D Ionospheric Electron Density Profiler
5.1 Ionospheric electron density model NeQuick
5.1.1 NeQuick model formulation for the bottom side (h < hmaXtF2)
5.1.2 NeQuick model formulation for the top side (hmax,F2 < /')
5.2 Characteristic parameters of the anchor points
5.2.1 Peak height of the F'2 region
5.2.2 Thickness parameters of the semi-Epstein layers
5.3 Providing the ionosonde parameters for NeQuick .
5.3.1 CCIR maps of /0F2 and M(3000)F2
5.3.2 Diagrammatic presentation of NeQuick
5.4 NeQuick for the Galileo navigation system
5.4.1 Effective Ionization Level (Az parameter) .
5.4.2 Estimation of the effective ionization level (nominal approach)
5.4.3 Improved version of NeQuick .
5.5 Estimation of the effective ionization level using GIM .
5.5.1 Estimation of the effective ionization level (alternative approach
5.5.2 Daily grid-based map of the effective ionization level
5.5.3 Az parameter for single point positioning .
5.6 Validation of the alternative approach .
5.6.1 Consistency of the approaches .
5.6.2 Modeling the spatial dependency of the Az parameter
5.6.3 Correlation between Az and F10.7
5.7 Performance of the NeQuick ionospheric model
5.7.1 Data specifications and processing
5.7.2 Comparison between the model errors .
5.8 Concluding remarks ..
6 Physics-Based Modeling of TEC
6.1 Normal ionosphere
6.1.1 Vertical electron density profile in the normal ionosphere . . . .
6.1.2 VTEC in the normal E-region .
6.1.3 VTEC in the normal F-region .
6.1.4 Combined VTEC of the normal ionosphere
6.1.5 Slant TEC in the normal ionosphere
6.2 Recursive model of VTEC in the normal ionosphere
6.2.1 Parametrization of the VTEC model .
6.2.2 Providing the model parameters
6.2.3 Functional model for estimating the parameters
6.2.4 Linearization of the functional model .
6.2.5 Least-squares solution of the model parameters
6.3 Performance of the VTEC model .
6.3.1 Local test of the VTEC model .
6.3.2 Global test of the VTEC model .
6.3.3 Applications of the VTEC model 6.4 Summary
7 Real-Time Modeling for Medium-Scale TID
7.1 Introduction
7.2 Medium-Scale Traveling Ionospheric Disturbances
7.3 Mechanical longitudinal wave equation
7.3.1 Traveling plane wave
7.3.2 Standing plane wave
7.4 GPS-provided TID observation .
7.4.1 Geometry-dependent trend of slant ionospheric delay
7.4.2 TID observation
7.4.3 Single-difference TID observation .
7.4.4 Double-difference TID observation .
7.5 TID observation equation .
7.5.1 Doppler-shift on TID observation .
7.6 Estimation of TID wave parameters
7.6.1 Period determination
7.6.2 TID wave vector determination
7.6.3 TID wave amplitude determination
7.7 Real-Time Medium-scale TID modeling
7.7.1 Initialization step
7.7.2 TID detection and scraping steps .
7.7.3 Cross correlation step .
7.7.4 TID parameter estimation .
7.7.5 TID ending .
7.7.6 Flowchart of the Real-Time TID modeling algorithm
7.7.7 Dependency on reference baseline .
7.7.8 Sensitivity to temporal resolution .
7.8 Implementation of the Real-Time TID modeling .
7.8.1 Case study: PRN 02
7.8.2 Case study: PRN 08
7.9 Conclusions and remarks
8 Conclusions and recommendations
8.1 Estimation of effective ionization for NeQuick .
8.2 Spatial and temporal variation of effective ionization level .
8.3 Performance of global TEC models
8.4 Model of temporal evolution of VTEC .
8.5 Modeling Medium-Scale Traveling Ionospheric Disturbances
Bibliography
IndexNuméro de notice : 15510 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Thèse étrangère DOI : sans En ligne : https://www.ncgeo.nl/downloads/71Memarzadeh.pdf Format de la ressource électronique : URL Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=62743 Réservation
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Code-barres Cote Support Localisation Section Disponibilité 15510-01 30.61 Livre Centre de documentation Géodésie Disponible Trajectory determination and analysis in sports by satellite and inertial navigation / Adrian Wägli (2009)
Titre : Trajectory determination and analysis in sports by satellite and inertial navigation Type de document : Thèse/HDR Auteurs : Adrian Wägli, Auteur ; Jan Skaloud, Directeur de thèse Editeur : Zurich : Schweizerischen Geodatischen Kommission / Commission Géodésique Suisse Année de publication : 2009 Collection : Geodätisch-Geophysikalische Arbeiten in der Schweiz, ISSN 0257-1722 num. 77 Importance : 173 p. Format : 21 x 30 cm ISBN/ISSN/EAN : 978-3-908440-20-5 Note générale : Bibliographie
Doctoral thesisLangues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications de géodésie spatiale
[Termes IGN] filtrage du bruit
[Termes IGN] GPS-INS
[Termes IGN] modèle d'erreur
[Termes IGN] navigation inertielle
[Termes IGN] orientation
[Termes IGN] positionnement par GNSS
[Termes IGN] positionnement par GPS
[Termes IGN] précision décimétrique
[Termes IGN] sport
[Termes IGN] test de performance
[Termes IGN] trajectographie par GPS
[Termes IGN] trajet (mobilité)Index. décimale : 30.83 Applications océanographiques de géodésie spatiale Résumé : (Auteur) [Préface] The abundance and availability of small positioning devices offers new opportunities (and challenges) for the art and science of Kinematic Geodesy. Certainly, as the inventors of inertial navigation never dreamed of a full Inertial Measurement Units (IMUs) occupying space of few cubic millimeters, the designers of the Global Positioning System (GPS) never thought of placing miniature receivers on human beings. Yet, it is the variety of civil application that improves the measurement accuracy of the originally military technology by an order (or several orders) of magnitude. This can be achieved either by exploiting secondary signals or by proposing innovative algorithms.
The research of Adrian Wagli belongs to the latter category as it presents (with an excellent rigor) innovative algorithms and data processing approaches which turn signals from small GPS receivers and miniature but very imprecise Micro-electromechanical (MEMS)-IMU into a convincing measurement instrument capable of tracking the skier's 2-G turn with 0.01% accuracy. The amalgam of high precision and small instrumentation then allows tracing movement of athletes not once in a while, but continuously at 100 times per second. Thus, through the practically continuous measurements of 3D position, velocity and orientation, the sportsmen's performance parameters can be deduced. Using it in sports like alpine skiing is very challenging task due to the encountered dynamic and the mountain surroundings that block the reception of satellite signals. Therefore, if the technology finds its place in such relatively hostile conditions, it can be" surely used for other purposes in more benign environment. At the same time it represents a very motivating factor for the research undertaken at the country to which such sport belongs.
In his work, Adrian Wagli demonstrates for the first time that redundant configuration of low-cost MEMS-IMUs allows determining orientation better than 1 degree RMS and that the autonomous positioning of decimeter accuracy is feasible with these sensors up to 30-second long outages of GPS signals even in high dynamic. Although the thesis is application-driven, i.e. the work results in. several algorithms and software modules applicable to real scenarios; it contains, at the same time, a I number of novel concepts applicable to other domains of navigation and kinematic positioning. The nicely presented combination of theory and practice will therefore satisfy a wide spectrum of readers.Note de contenu : 1 Introduction
1.1 Context
1.2 Particularities Related to Sport Applications
1.3 Objectives
1.4 Methodology
2 From Sports to Navigation
2.1 Criteria of Sport Applications
2.1.1 Accuracy Requirements
2.2 Methods for Trajectory Determination
2.2.1 Imagery
2.2.2 Satellite and Inertial Navigation
2.2.3 Alternative Techniques Based on Position Fixing
2.2.4 Complementary Methods to Trajectory Determination
2.2.5 Summary
2.3 Instrumentation for Satellite and Inertial Navigation
2.3.1 Overview on GNSS and Processing Methods
2.3.2 Inertial Measurement Units
2.3.3 Other Aspects Related to System Architecture
3 Measurements, Models and Estimation Methods
3.1 Inertial Measurement Model
3.1.1 Generalized Error Model for Inertial Observations
3.1.2 Simplified Error Model for Inertial Observations
3.2 Magnetic Measurements
3.3 GPS Observations
3.3.1 Code Measurements
3.3.2 Carrier-Phase Measurements
3.3.3 Carrier-Phase Smoothing
3.3.4 Doppler Measurements
3.3.5 Differential GPS
3.4 GPS/INS Sensor Fusion
3.4.1 Integration Constraints
3.4.2 Integration Strategy Trade-offs
3.4.3 Kalman Filtering
3.4.4 Optimal Smoothing
3.5 Implementation of GPS Processing
3.5.1 Definition of the State Vector
3.5.2 Initialization
3.5.3 State Propagation
3.5.4 Measurement Updates
3.6 Implementation of GPS/INS Integration
3.6.1 Definition of the State Vector
3.6.2 Initialization
3.6.3 Strapdown Inertial Navigation
3.6.4 Measurement Updates
4 GPS/MEMS-IMU System Performance
4.1 Experimental Setup
4.2 GPS/MEMS-IMU Performance
4.2.1 Satellite Navigation
4.2.2 GPS/MEMS-IMU Integration
4.2.3 GPS/MEMS-IMU Integration during Reduced Satellite Reception
4.2.4 Benefits of RTS Smoothing
4.3 Benefits of UKF
4.3.1 Navigation Performance
4.3.2 Implementation Aspects
4.4 Magnetic Sensors
4.5 Orientation Initialization
4.5.1 Evaluation based on Simulations
4.5.2 Experimental Evaluation
5 MEMS-IMU Error Modeling
5.1 Static Evaluation by Allan Variance
5.2 Static Estimation of the Noise Parameters
5.3 Dynamic Error Model Investigation
5.3.1 Estimation of the Relative Alignment of the MEMS-IMU
5.3.2 Estimation of the Reference Values for the Inertial Sensor Errors
5.3.3 Error Model Analysis
5.3.4 Relevance to Kalmari Filtering
5.4 Investigation of more Complex Error Models
6 Performance Improvement through Redundant IMUs
6.1 INS Redundancy Approaches in Inertial Navigation
6.2 Geometrical Arrangement of Redundant IMUs
6.3 Noise Reduction and Direct Noise Estimation
6.3.1 Noise Reduction
6.3.2 Direct Noise Estimation
6.4 Fault Detection and Isolation
6.5 System and Observation Model for the Redundant IMU Integration
6.5.1 Synthetic IMU Integration
6.5.2 Extended IMU Mechanization
6.5.3 Geometrically-Constrained Mechanization
6.6 Navigation Performance Improvement
6.6.1 Algorithm Selection
6.6.2 Assessment Based on Experiments
6.6.3 Assessment Based on Emulation
6.6.4 Notes on the Observability
6.6.5 Orientation Initialization and Inertial Error Estimation
7 From Navigation to Performance Assessment in Sport
7.1 Trajectory Modeling Approaches
7.1.1 Cubic Splines Smoothing
7.1.2 Additional Kalman Filtering
7.1.3 Limitations of Trajectory Modeling .
7.2 Trajectory Matching
7.2.1 Problem Definition
7.2.2 Extension of Cubic Spline Smoothing
7.2.3 Eigenvector Approach for Feature-Based Correspondence
7.2.4 Position Accuracy Improvement through Trajectory Matching
7.2.5 Risk Related to Trajectory Matching
7.3 Trajectory Comparison
7.3.1 Spatial Trajectory Comparison Approach
7.3.2 Methodology for Trajectory Comparison
7.3.3 Alternative Methods for Trajectory Comparison
7.3.4 Visualization Aspects
7.4 Position-Based Chronornetry
7.5 Orientation Related Assessment - Skiing
7.6 Orientation Related Assessment - Motorcycling
7.6.1 Reference Frame Aspects
7.6.2 Computation of the Lateral Slipping of Tires
7.6.3 Evaluation of the Tire Characteristics
7.6.4 Other Perspectives
8 Conclusions and Perspectives
8.1 Conclusions
8.2 PerspectivesNuméro de notice : 15514 Affiliation des auteurs : non IGN Autre URL associée : URL EPFL Thématique : POSITIONNEMENT Nature : Thèse étrangère DOI : 10.5075/epfl-thesis-4288 En ligne : https://www.sgc.ethz.ch/sgc-volumes/sgk-77.pdf Format de la ressource électronique : URL Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=62747 Réservation
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Code-barres Cote Support Localisation Section Disponibilité 15514-01 30.83 Livre Centre de documentation Géodésie Disponible Awareness in the air: rapid position updates for controllers and pilots / M. Harris in GPS world, vol 19 n° 12 (December 2008)
[article]
Titre : Awareness in the air: rapid position updates for controllers and pilots Type de document : Article/Communication Auteurs : M. Harris, Auteur ; T. Murphy, Auteur Année de publication : 2008 Article en page(s) : pp 40 - 46 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Navigation et positionnement
[Termes IGN] intégrité des données
[Termes IGN] navigation aérienne
[Termes IGN] positionnement cinématique
[Termes IGN] précision du positionnement
[Termes IGN] trafic aérienRésumé : (Editeur) As ubiquitous 4D position measurements capability transforms air traffic management, demands on the accuracy and integrity of the position determination increase. Can aviation GNSS systems keep up with surveillance requirements ? Numéro de notice : A2008-484 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article DOI : sans Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=29553
in GPS world > vol 19 n° 12 (December 2008) . - pp 40 - 46[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 067-08121 RAB Revue Centre de documentation En réserve L003 Disponible Verification of topographic road centerline data using ALOS/PRISM images: implementation / H. Fujimura in Bulletin of the Geographical survey institute, vol 56 (December 2008)
[article]
Titre : Verification of topographic road centerline data using ALOS/PRISM images: implementation Type de document : Article/Communication Auteurs : H. Fujimura, Auteur ; H. Ninami, Auteur ; et al., Auteur Année de publication : 2008 Article en page(s) : pp 27 - 36 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Bases de données localisées
[Termes IGN] axe médian
[Termes IGN] classification dirigée
[Termes IGN] classification par séparateurs à vaste marge
[Termes IGN] image ALOS-PRISM
[Termes IGN] image panchromatique
[Termes IGN] Japon
[Termes IGN] niveau de gris (image)
[Termes IGN] précision du positionnement
[Termes IGN] route
[Termes IGN] système d'information cartographique
[Termes IGN] valeur radiométriqueRésumé : (Auteur) Elimination of displacement due to map editing inherent in road centerline data of the New Topographic map Information System (NTIS) is implemented. Panchromatic satellite images from ALOS/PRISM are used in the process. Histogram analysis of gray value profiles parallel to the roads is employed. The true-position candidate is selected by supervised classification of histograms using support vector machine (SVM) method. According to the experiments with the Japanese NTIS road centerline database, the proposed method reverses the displacement of approximately 50 % of the road features, while a further 20% of the road features are validated as already located at the true position. The proposed method is proved to be useful for German Amtliches Topographisch-Kartographisches InformationsSystem (ATKIS) road database. This indicates wider applicability of this method to various geographic regions. Copyright Geographical Survey Institute Numéro de notice : A2008-518 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE/INFORMATIQUE Nature : Article DOI : sans En ligne : https://www.gsi.go.jp/common/000048821.pdf Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=29587
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Code-barres Cote Support Localisation Section Disponibilité 250-08021 RAB Revue Centre de documentation En réserve L003 Disponible Un point sur le réseau Teria : rencontre avec Patrick Di Renzo, directeur commercial d'Exagone, l'exploitant du réseau GPS permanent TERIA / Anonyme in Géomatique expert, n° 65 (01/11/2008)
[article]
Titre : Un point sur le réseau Teria : rencontre avec Patrick Di Renzo, directeur commercial d'Exagone, l'exploitant du réseau GPS permanent TERIA Type de document : Article/Communication Auteurs : Anonyme, Auteur Année de publication : 2008 Article en page(s) : pp 26 - 29 Langues : Français (fre) Descripteur : [Vedettes matières IGN] Systèmes de référence et réseaux
[Termes IGN] précision centimétrique
[Termes IGN] récepteur GNSS
[Termes IGN] site web
[Termes IGN] temps réel
[Termes IGN] TeriaRésumé : (Documentaliste) Le directeur commercial d'Exagone, société chargée de mettre en place, d'exploiter et d'entretenir le réseau Teria répond aux questions du magazine. Il explique pourquoi utiliser Teria et qui sont ses utilisateurs. Il commente l'état du réseau et l'intérêt de la labellisation de l'IGN. Numéro de notice : A2008-268 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article DOI : sans Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=29485
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