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Mapping Dilution of Precision (MDOP) and map-matched GPS / Geoffrey Blewitt in International journal of geographical information science IJGIS, vol 16 n° 1 (january 2002)
[article]
Titre : Mapping Dilution of Precision (MDOP) and map-matched GPS Type de document : Article/Communication Auteurs : Geoffrey Blewitt, Auteur ; Georges E. Taylor, Auteur Année de publication : 2002 Article en page(s) : pp 55 - 67 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Navigation et positionnement
[Termes IGN] affaiblissement géométrique de la précision
[Termes IGN] appariement de cartes
[Termes IGN] correction
[Termes IGN] erreur de positionnement
[Termes IGN] GPS assisté pour la navigation (technologies)
[Termes IGN] GPS en mode différentiel
[Termes IGN] méthode des moindres carrés
[Termes IGN] navigation automobile
[Termes IGN] positionnement différentiel
[Termes IGN] véhicule automobileRésumé : (Auteur) A novel method of map matching using the Global Positioning System (GPS) has been developed which uses digital mapping and height data to augment point position computation. This method reduces the error in position, which is a sum from several sources, including signal delay due to the ionosphere and atmosphere and until recently from 'selective availability' (S/A). S/A was imposed by the US military to degrade purposefully the accuracy of GPS, but was switched off on 2 May 2000, and is to be replaced with 'regional denial capabilities in lieu of global degradation' (Interagency GPS Executive Board, 2000). Taylor et al. (2001) describe the Road Reduction Filter (RRF) in detail. RRF is a method of detecting the correct road on which a vehicle is travelling. In the work described here, the position error vector is estimated in a formal least squares procedure, as the vehicle is moving. This estimate is a map-matched correction, that provides an autonomous alternative to DGPS for in-car navigation and fleet management. In this paper, a formula is derived for 'Mapped Dilution of Precision' (MDOP), defined as the theoretical ratio of position precision using map-matched corrections to that using perfect Differential GPS (DGPS) correction. This is shown to be purely a function of route geometry, and is computed for examples of basic road shapes. MDOP is favourable unless the route has less than a few degrees curvature for several kilometres. MDOP can thus provide an objective estimate of positioning precision to a vehicle driver. Precision estimates using MDOP are shown to agree well with 'true' positioning errors determined using high precision (cm) GPS carrier phase techniques. The exact location of a vehicle on a road is essential for accurate surveying applications. These include close range photogrammetry using digital video or still cameras and the verification of digital mapping by measured (GPS and other sensors) trajectories. Numéro de notice : A2002-004 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article DOI : 10.1080/13658810110075996 En ligne : https://doi.org/10.1080/13658810110075996 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=21921
in International journal of geographical information science IJGIS > vol 16 n° 1 (january 2002) . - pp 55 - 67[article]Exemplaires(1)
Code-barres Cote Support Localisation Section Disponibilité 079-02011 RAB Revue Centre de documentation En réserve L003 Disponible Leistungsfähigkeit fahrzeugautonomer Ortungsverfahren auf der Basis von Map-Matching-Techniken / R. Czommer (2001)
Titre : Leistungsfähigkeit fahrzeugautonomer Ortungsverfahren auf der Basis von Map-Matching-Techniken Titre original : [Capacité de réalisation de procédé de détection d'un véhicule autonome sur la base des techniques de "map-matching"] Type de document : Thèse/HDR Auteurs : R. Czommer, Auteur Editeur : Munich : Bayerische Akademie der Wissenschaften Année de publication : 2001 Collection : DGK - C Sous-collection : Dissertationen num. 535 Importance : 145 p. Format : 21 x 30 cm ISBN/ISSN/EAN : 978-3-7696-9574-8 Note générale : Bibliographie Langues : Allemand (ger) Descripteur : [Vedettes matières IGN] Navigation et positionnement
[Termes IGN] correction
[Termes IGN] erreur systématique
[Termes IGN] géonavigateur
[Termes IGN] GPS assisté pour la navigation (technologies)
[Termes IGN] GPS en mode différentiel
[Termes IGN] milieu urbain
[Termes IGN] navigation automobile
[Termes IGN] odomètre
[Termes IGN] qualité des données
[Termes IGN] véhicule automobileIndex. décimale : 30.70 Navigation et positionnement Résumé : (Auteur) Autonomous car navigation systems with on-board positioning sensors and CD-road network require a road accurate positioning relatively to the road network for optimal route planning, for route guidance and for generating driving recommendations. Positioning effected in a certain reference system and its accuracy are not decisive but represent the logical location of the vehicle relatively to the digital map. This task is called map matching.
Modern car navigation systems use for positioning multi-sensor-systems (differential odometers, gyros, magnetic field sensors) in combination with GPS or DGPS. Little availability of satellite methods due to masking and second way effects in urban areas (85% of mobility activities in road traffic occur in urban areas), magnetic disturbances, wheel slips and unfavourable error propagation of dead reckoning lead again and again to loss of position and in principle to total system failures. This can be avoided by map matching which compensates the sensor typical error behaviour of positioning sensors. The systematic error behaviour was examined theoretically for the positioning sensors odometer (wheel sensors, i.e. ABS-sensors), magnetic field sensors, gyros, accelerometers, GPS, and DGPS. Based on these error models five map matching methods with different degrees of freedom were developed, estimated correspondingly to the various ways of presentation of plain curves in curvature pattern, in angular pattern, or with two-dimensional cartesian coordinates.
For orientation or curvature map matching the distance frives (ruve length) and the values of orientation (direction angle or curvatures) are derived from these measurements. This measured function over the curve length is fitted to the corresponding function of the map by estimating one offset and one scale factor in a least square adjustment between the two functions and the two curve lengths.
In case of coordinate procedures the driven distance is divided into line elements of constant length and compared with the line elements of the digital map. For matching onto the digital road network, three approximating transformation translations, plain similarity transformation and affinity transformation are studied. The sensivity of these five methods concerning systematic sensor errors is examined by a precise analysis by means of simulated observations for the sensor systems gyro with odometer and gyro with accelerometers.
Scale factors and bias of gyros can be compensated by curvature matching without any calibration of these errors. Accelerometer errors gradually lead to squared increasing errors regarding the measured distance, and cannot be matched without error compensation to any method on the map.
Based on real observations with GPS, DGPS, wheel sensors, and a strap down inertial system being investigated during test trips under normal traffic conditions the map matching procedures could be tested for various combinations of these sensors. The accuracies reached and the reliability of track identification of the exact track out of various alternative tracks being especially important for vehicle navigation, were analysed and valued.
In urban areas pure GPS measurements are often useless, as every change in satellite constellations leads to disturbances of the vehicle position which cannot be compensated by one of the methods.
DGPS needs a support by wheel sensors to bridge masking effects and to moderate drift effects during extremely slow motion. Measurements by sensor combinations such as gyro with wheel sensors, differential odometer, GPS with differential odometer, DGPS with differential odometer and pure DGPS (without long masking times) can be matched onto the map with all methods (besides translation), if at least two turns are contained within the data material.
The precision of the map matching process to the coordinate pattern decreases with growing distance. The orientation and curvature matching compensate systematic sensor errors considerably better and increase accuracy with growing distance.
The limits of positioning systems and map matching techniques are shown in problematic cases such as masking of the satellite signals, little curving of the track, track identification in nearly parallel alternative tracks.
Autonomous navigation systems based on odometers and gyros reach, by map matching onto the road net, more favourable positioning results at an accuracy of 70cm than pure DGPS measurements so that in urban areas a reliable map matching without DGPS is possible. The integration of DGPS does not show a considerable increase in accuracy, nevertheless the integrity of hybrid systems is increased.Numéro de notice : 68943 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Thèse étrangère Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=62060 Exemplaires(2)
Code-barres Cote Support Localisation Section Disponibilité 68943-01 30.70 Livre Centre de documentation Géodésie Disponible 68943-02 30.70 Livre Centre de documentation Géodésie Disponible Orthophotograph production in urban areas: paper read at the Thompson symposium of the photogrammetric society held at the University of Durham on 19th April, 1998 / Dimitrios Skarlatos in Photogrammetric record, vol 16 n° 94 (October 1999 - March 2000)
[article]
Titre : Orthophotograph production in urban areas: paper read at the Thompson symposium of the photogrammetric society held at the University of Durham on 19th April, 1998 Type de document : Article/Communication Auteurs : Dimitrios Skarlatos, Auteur Congrès : Thompson symposium of the photogrammetric society (19 avril 1998; Durham), Auteur Année de publication : 1999 Article en page(s) : pp 643 - 650 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Orthophotographie, orthoimage
[Termes IGN] cartographie
[Termes IGN] correction
[Termes IGN] milieu urbain
[Termes IGN] orthophotographie
[Termes IGN] système d'information géographiqueRésumé : (Auteur) Recherche de solutions pour les problèmes dédoublements dans la cartographie de l'orthophotographie en zone urbaine. Deux méthodes sont analysées. Des sous-programmes en langage C spécialement adaptés aux problèmes des zones urbaines sont écrits puis évalués en terme de précision des résultats. Des difficultés subsistent. Numéro de notice : A1999-051 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article DOI : 10.1111/0031-868X.00144 En ligne : https://doi.org/10.1111/0031-868X.00144 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=26239
in Photogrammetric record > vol 16 n° 94 (October 1999 - March 2000) . - pp 643 - 650[article]Exemplaires(1)
Code-barres Cote Support Localisation Section Disponibilité 106-99021 RAB Revue Centre de documentation En réserve L003 Disponible Revision measurement of large scale topographic data / R.P. Kirby (01/09/1999)
Titre : Revision measurement of large scale topographic data Type de document : Chapitre/Contribution Auteurs : R.P. Kirby, Auteur Année de publication : 01/09/1999 Importance : pp 13 - 70 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Photogrammétrie numérique
[Termes IGN] base de données topographiques
[Termes IGN] Belgique
[Termes IGN] correction
[Termes IGN] erreur de positionnement
[Termes IGN] Finlande
[Termes IGN] grande échelle
[Termes IGN] Grande-Bretagne
[Termes IGN] Irlande
[Termes IGN] Irlande du nord
[Termes IGN] jeu de données localisées
[Termes IGN] NorvègeNuméro de notice : H1999-001 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Chapître / contribution Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=65877 Practical geodesy / M. Hooijberg (1997)
Titre : Practical geodesy : using computers Type de document : Guide/Manuel Auteurs : M. Hooijberg, Auteur Editeur : Berlin, Heidelberg, Vienne, New York, ... : Springer Année de publication : 1997 Importance : 308 p. Format : 20 x 27 cm ISBN/ISSN/EAN : 978-3-540-61826-3 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie
[Termes IGN] Australie
[Termes IGN] Belgique
[Termes IGN] Bornéo, île de
[Termes IGN] carroyage
[Termes IGN] Chine
[Termes IGN] correction
[Termes IGN] Etats-Unis
[Termes IGN] France (administrative)
[Termes IGN] Irlande
[Termes IGN] Italie
[Termes IGN] Maroc
[Termes IGN] nivellement indirect
[Termes IGN] Norvège
[Termes IGN] Pays-Bas
[Termes IGN] projection
[Termes IGN] projection conforme
[Termes IGN] projection de Gauss
[Termes IGN] projection Lambert
[Termes IGN] projection Universal Transverse Mercator
[Termes IGN] République fédérale d'Allemagne
[Termes IGN] réseau géodésique
[Termes IGN] Royaume-Uni
[Termes IGN] Suisse
[Termes IGN] système de référence géodésique
[Termes IGN] transformation de coordonnées
[Termes IGN] World Geodetic System 1972
[Termes IGN] World Geodetic System 1984Index. décimale : 30.00 Géodésie - généralités Numéro de notice : 67732 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Manuel de cours Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=49153 Exemplaires(2)
Code-barres Cote Support Localisation Section Disponibilité 67732-03 DEP-RECG Livre Marne-la-Vallée Dépôt en unité Exclu du prêt 67732-02 DEP-PMA Livre SGM Dépôt en unité Exclu du prêt Orthophotographies numériques pour un environnement micro-informatique / M. Ettarid in Bulletin [Société Française de Photogrammétrie et Télédétection], n° 144 (Octobre 1996)PermalinkInterference measurements of the Chang Yang standard baseline in 1994 / Jorma Jokela (1996)PermalinkSimulation de données Spot 1A à partir de données 1B, exploitation photogrammétrique sur Traster T 10 / Eric Bleuzet (1993)PermalinkThe remeasurement of the Chang Yang standard baseline / R. Konttinen (1991)PermalinkOh, grosserorors ! Traitements automatiques des fautes de mesures / D. Brichet (1990)PermalinkTest de carte sur fond d'images SPOT / Abel Fannou (1990)PermalinkNon-current ephemeris for approximated calculations / S. Troisi in Survey review, vol 30 n° 233 (July 1989)PermalinkNormal gravity and circuit closures in the Nigerian leveling / M.B. Ebong in Survey review, vol 30 n° 233 (July 1989)PermalinkThe application of a weighted infrared-red vegetation index for estimating leaf area index by correcting for soil moisture / J.G. Clevers in Remote sensing of environment, vol 29 n° 1 (July 1989)PermalinkLowest-order correction to GVI data for solar zenith angle effect / S.M. Singh in International Journal of Remote Sensing IJRS, vol 10 n°4-5 (May 1989)Permalink