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WebGIS for evaluating walkability environment in urban center of Tsukuba / R. Thapa in Tsukuba geoenvironmental sciences, vol 5 (01/12/2009)
[article]
Titre : WebGIS for evaluating walkability environment in urban center of Tsukuba Type de document : Article/Communication Auteurs : R. Thapa, Auteur ; Yuji Murayama, Auteur Année de publication : 2009 Article en page(s) : pp 41 - 45 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications SIG
[Termes IGN] accessibilité
[Termes IGN] diffusion de données
[Termes IGN] espace vert
[Termes IGN] exploration de données géographiques
[Termes IGN] itinéraire
[Termes IGN] Japon
[Termes IGN] piéton
[Termes IGN] qualité de l'air
[Termes IGN] trajet (mobilité)
[Termes IGN] WebSIGRésumé : (Auteur) This article examines walkability areas in Tsukuba and presents results on the web by creating Walkability WebGIS. ALOS image, Zenrin, and road maps were used for the study. Greenness index was computed to highlight urban greeneries in the walkability areas. A fieldwork was conducted to verify the research results. From well settled to tranquil areas were identified to better inform the walkers or bicycle riders. Walkability routes were further graded into five levels of suitability ranging from very low to very high based on the greenness index. Walkability WebGIS (http://sae.sk.tsukuba.ac.jp/TsukubaWalkability/default. aspx) including easy-to-use help system was developed on ArcGIS Server platform to disseminate the results to the Tsukuba residents. Geographic data exploration tool bar, search and proximity analysis functions were also provided in the system. In this system, the residents can freely explore the maps and use spatial functions to understand their surrounding walkability environments, and print the maps for their daily use. Numéro de notice : 10394 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article DOI : sans En ligne : http://hdl.handle.net/2241/106560 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=33409
in Tsukuba geoenvironmental sciences > vol 5 (01/12/2009) . - pp 41 - 45[article]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 Exemplaires(1)
Code-barres Cote Support Localisation Section Disponibilité 15514-01 30.83 Livre Centre de documentation Géodésie Disponible L'analyse de performance sportive à l'aide d'un système GPS/INS low-cost : évaluation de capteurs inertiels de type MEMS / A. Waegli in XYZ, n° 113 (décembre 2007 - février 2008)
[article]
Titre : L'analyse de performance sportive à l'aide d'un système GPS/INS low-cost : évaluation de capteurs inertiels de type MEMS Type de document : Article/Communication Auteurs : A. Waegli, Auteur ; J.M. Bonnaz, Auteur ; Jan Skaloud, Auteur Année de publication : 2007 Article en page(s) : pp 19 - 24 Note générale : Bibliographie Langues : Français (fre) Descripteur : [Vedettes matières IGN] Applications de géodésie spatiale
[Termes IGN] centrale inertielle
[Termes IGN] détecteur
[Termes IGN] GPS-INS
[Termes IGN] sport
[Termes IGN] trajet (mobilité)Résumé : (Auteur) Les skieurs s'intéressent au GPS (Global Positioning System) pour évaluer leurs performances. Les positions enregistrées durant les entraînements et les courses permettent d'analyser les trajectoires et de comparer vitesses, accélérations et autres paramètres liés à la performance sportive (p. ex. la fréquence cardiaque). Malheureusement, l'environnement montagneux, la dynamique relativement élevée du skieur et les restrictions ergonomiques dépassent souvent les limites technologiques actuelles. Des centrales inertielles de type MEMS (Micro-Electronic-Mechanical Systems) couplées à des récepteurs GPS offrent une certaine autonomie lorsque le signal GPS est défectueux. Malheureusement, les capteurs MEMS-IMU (Inertial Measurement Unit) ont des erreurs systématiques importantes et de comportement peu connu. Cet article présente une expérience durant laquelle un skieur a été équipé avec des récepteurs GPS, des capteurs MEMS-IMU et une centrale inertielle haut de gamme servant de référence. Cette expérience a permis d'analyser le comportement d'erreur des MEMS-IMU et d'investiguer la performance de l'intégration GPS/MEMS-IMU en termes de position, vitesse et orientation. Copyright AFT Numéro de notice : A2007-633 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article DOI : sans Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=29470
in XYZ > n° 113 (décembre 2007 - février 2008) . - pp 19 - 24[article]Exemplaires(1)
Code-barres Cote Support Localisation Section Disponibilité 112-07041 RAB Revue Centre de documentation En réserve L003 Exclu du prêt Ad hoc shared-ride trip planning by mobile geosensor networks / Stephan Winter in International journal of geographical information science IJGIS, vol 20 n° 8 (september 2006)
[article]
Titre : Ad hoc shared-ride trip planning by mobile geosensor networks Type de document : Article/Communication Auteurs : Stephan Winter, Auteur ; Silvia Nittel, Auteur Année de publication : 2006 Article en page(s) : pp 899 - 916 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications SIG
[Termes IGN] méthode heuristique
[Termes IGN] mobilité urbaine
[Termes IGN] réseau de transport
[Termes IGN] trajet (mobilité)
[Termes IGN] transport collectifRésumé : (Auteur) Recent developments in miniaturization of computing devices, in location-sensing technology and in ubiquitous short-range wireless networks enable new types of social behaviour. This paper investigates one novel application of these technologies, ad hoc inner-urban shared-ride trip planning: Transportation clients such as pedestrians are seeking ad hoc shared rides from transportation hosts such as private automobiles, buses, taxi cabs or trains. While centralized trip planners are challenged by assigning clients and hosts in an ad hoc manner, in particular for non-scheduled hosts, we consider the transportation network as a mobile geosensor network of agents that interact locally by short-range communication and heuristic wayfinding strategies. This approach is not only fully scalable; we can also demonstrate that with short-range communication, and hence, incomplete transportation network knowledge a system still can deliver near-to-optimal trips. Numéro de notice : A2006-350 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article DOI : 10.1080/13658810600816664 En ligne : https://doi.org/10.1080/13658810600816664 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=28074
in International journal of geographical information science IJGIS > vol 20 n° 8 (september 2006) . - pp 899 - 916[article]Exemplaires(2)
Code-barres Cote Support Localisation Section Disponibilité 079-06081 RAB Revue Centre de documentation En réserve L003 Disponible 079-06082 RAB Revue Centre de documentation En réserve L003 Disponible Movement simulation and analysis: modelling railway passenger activity in Tokyo / R. Xie in GIM international, vol 19 n° 12 (December 2005)
[article]
Titre : Movement simulation and analysis: modelling railway passenger activity in Tokyo Type de document : Article/Communication Auteurs : R. Xie, Auteur ; Ryosuke Shibasaki, Auteur Année de publication : 2005 Article en page(s) : pp 43 - 45 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Analyse spatiale
[Termes IGN] mobilité urbaine
[Termes IGN] modèle conceptuel de données spatio-temporelles
[Termes IGN] réseau métropolitain
[Termes IGN] simulation
[Termes IGN] Tokyo (Japon)
[Termes IGN] trajet (mobilité)Résumé : (Auteur) In a world where everyone is constantly on the move, simulation and analysis of characteristics of the movement of objects is increasingly important, not only for behaviour forecast and policy/decision-making but also for monitoring and accident prevention. The authors developed key techniques for modelling large-scale moving objects and applied the system in movement simulation and pattern analysis of railway station passengers in Tokyo. Copyright Reed Business Information Numéro de notice : A2005-464 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article DOI : sans Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=27600
in GIM international > vol 19 n° 12 (December 2005) . - pp 43 - 45[article]Exemplaires(1)
Code-barres Cote Support Localisation Section Disponibilité 061-05121 RAB Revue Centre de documentation En réserve L003 Disponible Le territoire des hommes / Jean Poulit (2005)PermalinkMultistate supernetwork approach to modelling multi-activity, multimodal trip chains / Theo Arentze in International journal of geographical information science IJGIS, vol 18 n° 7 (november 2004)PermalinkA comparison of two methods to create tracks of moving objects: linear weighted distance and constrained random walk [distance linéaire pondérée et trajet aléatoire contraint] / E.A. Wentz in International journal of geographical information science IJGIS, vol 17 n° 7 (october 2003)Permalink