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Finding the right algorithm: low-cost, single-frequency GPS-GLONASS RTK for road users / Sébastien Carcanague in Inside GNSS, vol 8 n° 6 (November - December 2013)
[article]
Titre : Finding the right algorithm: low-cost, single-frequency GPS-GLONASS RTK for road users Type de document : Article/Communication Auteurs : Sébastien Carcanague, Auteur ; Willy Vigneau, Auteur ; Olivier Julien, Auteur ; et al., Auteur Année de publication : 2013 Article en page(s) : 11 p. ; pp 70 - 80 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Navigation et positionnement
[Termes IGN] filtre de Kalman
[Termes IGN] milieu urbain
[Termes IGN] navigation automobile
[Termes IGN] positionnement cinématique en temps réel
[Termes IGN] récepteur GNSS
[Termes IGN] récepteur monofréquence
[Termes IGN] test de performanceRésumé : (Editeur) Urban navigation would greatly benefit from higher accuracy and more reliable positioning, especially in signal-challenged environments. Multiconstellation real-time kinematic RTK techniques can contribute to a solution, but typically they require expensive equipment. A team of research engineers tested a new algorithm on low-cost consumer GNSS receiver with promising results. Numéro de notice : A2013-726 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article DOI : sans Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=32862
in Inside GNSS > vol 8 n° 6 (November - December 2013) . - 11 p. ; pp 70 - 80[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 159-2013061 SL Revue Centre de documentation Revues en salle Disponible Documents numériques
en open access
a2013-726_finding_the_right_algorithm_carcanague.pdfAdobe Acrobat PDF Getting closer to everywhere: accurately tracking smartphones indoors / Ramsey Faragher in GPS world, vol 24 n° 10 (October 2013)
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Titre : Getting closer to everywhere: accurately tracking smartphones indoors Type de document : Article/Communication Auteurs : Ramsey Faragher, Auteur ; Robert Harle, Auteur Année de publication : 2013 Article en page(s) : pp 43 - 49 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Navigation et positionnement
[Termes IGN] accéléromètre
[Termes IGN] apprentissage automatique
[Termes IGN] gyroscope
[Termes IGN] magnétomètre
[Termes IGN] microsystème électromécanique
[Termes IGN] navigation à l'estime
[Termes IGN] navigation pédestre
[Termes IGN] odomètre
[Termes IGN] positionnement en intérieur
[Termes IGN] téléphone intelligentRésumé : (Editeur) [...] What are we to do if we wish to obtain consistently usable positions indoors using a mobile phone? As we will see in this month's column, we can augment or bypass its GPS or GNSS receiver with other unfettered sensing technologies such as gyroscopes and accelerometers. These devices can be made very small using microelectromechanical technology and are already included in some mobile phones. However, there are some issues with these devices for positioning, not the least of which is rapid position drift. We can restrain the drift by using magnetometers, for example - also present in some mobile phones. We can also use radio signals of opportunity to help in the positioning - signals available in the phone such as multi-generation mobile signals, Bluetooth, and Wi-Fi through their signal strength "fingerprints." But is all of this actually feasible? The authors of the article in this month's column have conducted tests of such a multi-system approach to positioning indoors with quite favorable results. Are we at the stage of accurate positioning (and tracking) everywhere? Not quite, but we are getting closer. Numéro de notice : A2013-586 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article DOI : sans Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=32722
in GPS world > vol 24 n° 10 (October 2013) . - pp 43 - 49[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 067-2013101 RAB Revue Centre de documentation En réserve L003 Disponible A spatio-temporal graph model for marine dune dynamics analysis and representation / Rémy Thibaud in Transactions in GIS, vol 17 n° 5 (October 2013)
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Titre : A spatio-temporal graph model for marine dune dynamics analysis and representation Type de document : Article/Communication Auteurs : Rémy Thibaud, Auteur ; Géraldine Del Mondo, Auteur ; Thierry Garlan, Auteur ; Ariane Mascret, Auteur ; Christophe Carpentier, Auteur Année de publication : 2013 Article en page(s) : pp 742 - 762 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications SIG
[Termes IGN] analyse spatio-temporelle
[Termes IGN] base de données spatiotemporelles
[Termes IGN] dune
[Termes IGN] dynamique des solides
[Termes IGN] graphe
[Termes IGN] modélisation spatio-temporelle
[Termes IGN] navigation maritimeRésumé : (Auteur) Defining a model for the representation and the analysis of spatio-temporal dynamics remains an open domain in geographical information sciences. In this article we investigate a spatio-temporal graph-based model dedicated to managing and extracting sets of geographical entities related in space and time. The approach is based on spatial and temporal local relations between neighboring entities during consecutive times. The model allows us to extract sets of connected entities distant in time and space over long periods and large spaces. From GIS concepts and qualitative reasoning on space and time, we combine the graph model with a dedicated spatial database. It includes information on geometry and geomorphometric parameters, and on spatial and temporal relations. This allows us to extend classical measurements of spatial parameters, with comparisons of entities linked by complex relations in space and time. As a case study, we show how the model suggests an efficient representation of dunes dynamics on a nautical chart for safe navigation. Numéro de notice : A2013-580 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1111/tgis.12006 Date de publication en ligne : 09/09/2013 En ligne : https://doi.org/10.1111/tgis.12006 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=32716
in Transactions in GIS > vol 17 n° 5 (October 2013) . - pp 742 - 762[article]Urban network analysis: Centrality, sinuosity and shortcut detection / Theophile Emmanouilidis in Revue internationale de géomatique, vol 23 n° 3 - 4 (septembre 2013 - février 2014)
[article]
Titre : Urban network analysis: Centrality, sinuosity and shortcut detection Type de document : Article/Communication Auteurs : Theophile Emmanouilidis, Auteur Année de publication : 2013 Article en page(s) : pp 431 - 444 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Analyse spatiale
[Termes IGN] chemin le plus court, algorithme du
[Termes IGN] distance euclidienne
[Termes IGN] itinéraire
[Termes IGN] Lausanne
[Termes IGN] milieu urbain
[Termes IGN] navigation pédestre
[Termes IGN] piéton
[Termes IGN] réseau routier
[Termes IGN] sinuositéRésumé : (Auteur) This paper analyses the structure of roads (directed) and the pedestrian (undirected) networks in Lausanne (Switzerland). Centrality and sinuosity indexes are computed to perform spatial analysis at various scales. The study shows that the sinuosity index varies a lot at local (pedestrian) scale. The link between these variations and the underlying street patterns is investigated. The method also suggests that the comparison between Euclidean and shortest path distances can be used to improve pedestrian network by creating promising shortcuts, or alternatively to detect major network topological errors. Numéro de notice : A2013-719 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE/URBANISME Nature : Article DOI : 10.3166/rig.23.431-443 En ligne : https://doi.org/10.3166/rig.23.431-443 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=32855
in Revue internationale de géomatique > vol 23 n° 3 - 4 (septembre 2013 - février 2014) . - pp 431 - 444[article]Exemplaires(1)
Code-barres Cote Support Localisation Section Disponibilité 047-2013031 SL Revue Centre de documentation Revues en salle Exclu du prêt Improvement of GPS/acoustic seafloor positioning precision through controlling the ship’s track line / M. Sato in Journal of geodesy, vol 87 n° 9 (September 2013)
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Titre : Improvement of GPS/acoustic seafloor positioning precision through controlling the ship’s track line Type de document : Article/Communication Auteurs : M. Sato, Auteur ; M. Fujita, Auteur ; Y. Matsumoto, Auteur ; et al., Auteur Année de publication : 2013 Article en page(s) : pp 825 - 842 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Navigation et positionnement
[Termes IGN] bathymétrie acoustique
[Termes IGN] cable
[Termes IGN] fond marin
[Termes IGN] GPS assisté pour la navigation (technologies)
[Termes IGN] Japon
[Termes IGN] lever bathymétrique
[Termes IGN] navigation maritime
[Termes IGN] navire
[Termes IGN] positionnement par GPS
[Termes IGN] précision du positionnement
[Termes IGN] sondeur acoustiqueRésumé : (Auteur) The precision of GPS/acoustic seafloor positioning was improved by introducing a hull-mounted onboard system in March 2008, which allows us to conduct acoustic ranging measurements with the vessel sailing along the pre-determined track lines, while the early system before 2008 could only adopt the uncontrollable drifting observation. The continuity of the positioning results due to the transition was first confirmed through the comparison between results from sailing and drifting observations conducted in parallel. Using the data acquired for about 3 years since 2008, the repeatability of the determined position for the sailing observation was evaluated to be about 2 cm in root mean squares in the horizontal component, significantly better than that for the early drifting observation. The improvement of positioning precision probably resulted from the improvement of geometric distribution of acoustic ranging data by controlling the track lines. It was also shown that the sailing observation allows to obtain reliable results with a smaller amount of data. Comparison between the results in different sea regions suggests that positioning precision is better in the region along the Nankai Trough than in the region along the Japan Trench, probably because of the complicated acoustic velocity structure of seawater often observed in the latter. Furthermore, the precision of height determination was also improved, which leads us to expect that vertical crustal movement will be detectable in the future through accumulation of data as well as further technology development. Numéro de notice : A2013-564 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1007/s00190-013-0649-9 Date de publication en ligne : 02/07/2013 En ligne : https://doi.org/10.1007/s00190-013-0649-9 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=32700
in Journal of geodesy > vol 87 n° 9 (September 2013) . - pp 825 - 842[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 266-2013091 SL Revue Centre de documentation Revues en salle Disponible Réinventer la carte / Françoise de Blomac in DécryptaGéo le mag, n° 149 (01/09/2013)PermalinkAn information model for pedestrian routing and navigation databases supporting universal accessibility / Mari Laasko in Cartographica, vol 48 n° 2 (June 2013)PermalinkCrowdsourcing techniques for augmenting traditional accessibility maps with transitory obstacle information / Matthew T. Rice in Cartography and Geographic Information Science, vol 40 n° 3 (June 2013)PermalinkDriving the industry / Sergio Barata in GEO: Geoconnexion international, vol 12 n° 6 (june 2013)PermalinkFrom the portolan chart to the latitude chart / Joaquim Alves Gaspar in Cartes & Géomatique, n° 216 (juin 2013)PermalinkLocation-based illustration mapping applications and editing tools / Min Lu in Cartographica, vol 48 n° 2 (June 2013)PermalinkMap design aspects, route complexity, or social background? Factors influencing user satisfaction with indoor navigation maps / Alexandra Lorenz in Cartography and Geographic Information Science, vol 40 n° 3 (June 2013)PermalinkPiris Reis: His uniquness among cartographers and hydrographers of the Renaissance / Svat Soucek in Cartes & Géomatique, n° 216 (juin 2013)PermalinkWhy the artificial shapes for the smaller islands on the portolan charts (1330-1600) help to clarify their navigational use / Tony Campbell in Cartes & Géomatique, n° 216 (juin 2013)PermalinkDirectional relations and frames of reference / Eliseo Clementini in Geoinformatica, vol 17 n° 2 (April 2013)Permalink