Descripteur
Documents disponibles dans cette catégorie (415)
Ajouter le résultat dans votre panier
Visionner les documents numériques
Affiner la recherche Interroger des sources externes
Etendre la recherche sur niveau(x) vers le bas
I’m walking here! Checking the accuracy of an inertial-based pedestrian navigation system with a drone / Marcin Uradzinski in GPS world, vol 28 n° 6 (June 2017)
[article]
Titre : I’m walking here! Checking the accuracy of an inertial-based pedestrian navigation system with a drone Type de document : Article/Communication Auteurs : Marcin Uradzinski, Auteur ; Hang Guo, Auteur ; Clifford Mugnier, Auteur Année de publication : 2017 Article en page(s) : pp 58 - 64 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Navigation et positionnement
[Termes IGN] drone
[Termes IGN] filtre de Kalman
[Termes IGN] navigation à l'estime
[Termes IGN] navigation pédestre
[Termes IGN] piéton
[Termes IGN] positionnement en intérieurRésumé : (Auteur) Satellite navigation systems have achieved great success in personal positioning applications. Nowadays, GNSS is an essential tool for outdoor navigation, but locating a user’s position in degraded and denied indoor environments is still a challenging task. During the past decade, methodologies have been proposed based on inertial sensors for determining a person’s location to solve this problem. One such solution is a personal pedestrian dead reckoning (PDR) system, which helps in obtaining a seamless indoor/outdoor position. Built-in sensors measure the acceleration to determine pace count and estimate the pace length to predict position with heading information coming from angular sensors such as magnetometers or gyroscopes. PDR positioning solutions find many applications in security monitoring, personal services, navigation in shopping centers and hospitals and for guiding blind pedestrians. Several dead-reckoning navigation algorithms for use with inertial measurement units (IMUs) have been proposed. However, these solutions are very sensitive to the alignment of the sensor units, the inherent instrumental errors, and disturbances from the ambient environment - problems that cause accuracy to decrease over time. In such situations, additional sensors are often used together with an IMU, such as ZigBee radio beacons with position estimated from received signal strength. In this article, we present a PDR indoor positioning system we designed, tested and analyzed. It is based on the pace detection of a foot-mounted IMU, with the use of extended Kalman filter (EKF) algorithms to estimate the errors accumulated by the sensors. Numéro de notice : A2017-294 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article DOI : sans Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=85332
in GPS world > vol 28 n° 6 (June 2017) . - pp 58 - 64[article]Information extraction and visualization from twitter considering spatial structure / Hideyuki Fujita in Cartographica, vol 52 n° 2 (Summer 2017)
[article]
Titre : Information extraction and visualization from twitter considering spatial structure Type de document : Article/Communication Auteurs : Hideyuki Fujita, Auteur Année de publication : 2017 Article en page(s) : pp 178 - 193 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Termes IGN] données issues des réseaux sociaux
[Termes IGN] extraction de données
[Termes IGN] géobalise
[Termes IGN] point d'intérêt
[Termes IGN] structure spatiale
[Termes IGN] Twitter
[Termes IGN] utilisateur
[Vedettes matières IGN] GéovisualisationRésumé : (Auteur) Mobile social media represented by Twitter are expected to be a suitable source of data for analyzing human behaviour and statuses of locations. It seems that we can provide location-based information simply by spatially filtering archived data. However, there are several problems in terms of practical use. This research considers in particular problems that concern the relationship between data meaning and their spatial structures. With regard to Twitter, in general, the location from which a tweet is posted is attached to a geotagged tweet. For example, the location coordinates attached to the geotagged tweet “Heavy rain in Miura Peninsula” by NHK (Japan's public broadcaster) are not those of the Miura Peninsula, but of Shibuya in Tokyo (where NHK is located). Therefore, the tweet is not found by a spatial search around the Miura Peninsula or even Kanagawa Prefecture (where the Miura Peninsula is located). To resolve such problems, we propose a framework that distinguishes locations of interest and locations of activity. We propose a method for automatically classifying such locations and develop a data collection, classification, and visualization system based on this method. Numéro de notice : A2017-375 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article DOI : 10.3138/cart.52.2.3875 En ligne : https://doi.org/10.3138/cart.52.2.3875 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=85800
in Cartographica > vol 52 n° 2 (Summer 2017) . - pp 178 - 193[article]Réservation
Réserver ce documentExemplaires(1)
Code-barres Cote Support Localisation Section Disponibilité 031-2017021 SL Revue Centre de documentation Revues en salle Disponible Smart cartographic functionality for improving data visualization in map mashups / Nadia H. Panchaud in Cartographica, vol 52 n° 2 (Summer 2017)
[article]
Titre : Smart cartographic functionality for improving data visualization in map mashups Type de document : Article/Communication Auteurs : Nadia H. Panchaud, Auteur ; Ionuţ Iosifescu Enescu, Auteur ; Lorenz Hurni, Auteur Année de publication : 2017 Article en page(s) : pp 194 - 211 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Cartographie numérique
[Termes IGN] activité cartographique
[Termes IGN] aide à la conception informatique
[Termes IGN] application composite
[Termes IGN] cartographie par internet
[Termes IGN] données multisources
[Termes IGN] fonctionnalité
[Termes IGN] géoportail
[Termes IGN] rendu (géovisualisation)
[Termes IGN] sémiologie graphique
[Termes IGN] utilisateurRésumé : (Auteur) Thanks to the growth of geoportal products and online cartographic platforms, access to spatial data has never been so easy for so many people. But access to cartographic knowledge for laypersons using such data is lagging behind. Platforms that allow users to create map mashups from diverse data sources can lead to unsatisfactory cartographic visualization, which reduces the map's legibility and the usefulness of such functions. This article's focus is on creating a framework that supports smart cartographic functions to improve the quality of map mashups. First, we assess the state of cartographic conflicts due to map mashup, using examples from existing geoportals. Afterwards, we describe a framework that allows us to define cartographic functions, focusing on symbology changes and based on a client-side approach. We do not aim to fully model the complex decision-making process of a professional cartographer, but rather to provide a set of smart functions that use appropriate assumptions and constraints based on cartographic principles and semantic information. As proof of concept, the framework and functions are then integrated within a geoportal. Numéro de notice : A2017-376 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article DOI : 10.3138/cart.52.2.4115 En ligne : https://doi.org/10.3138/cart.52.2.4115 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=85801
in Cartographica > vol 52 n° 2 (Summer 2017) . - pp 194 - 211[article]Réservation
Réserver ce documentExemplaires(1)
Code-barres Cote Support Localisation Section Disponibilité 031-2017021 SL Revue Centre de documentation Revues en salle Disponible User testing of dynamic geovisualizations : lessons learned and possible improvements for cartographic experiments / Cécile Saint-Marc in International journal of cartography, vol 3 n° 1 (June 2017)
[article]
Titre : User testing of dynamic geovisualizations : lessons learned and possible improvements for cartographic experiments Type de document : Article/Communication Auteurs : Cécile Saint-Marc, Auteur ; Marlène Villanova-Oliver, Auteur ; Paule-Annick Davoine, Auteur ; et al., Auteur Année de publication : 2017 Article en page(s) : pp 88 - 101 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Termes IGN] analyse comparative
[Termes IGN] cartographie dynamique
[Termes IGN] interface graphique
[Termes IGN] précision des mesures
[Termes IGN] rendu (géovisualisation)
[Termes IGN] test de performance
[Termes IGN] utilisateur civil
[Vedettes matières IGN] GéovisualisationRésumé : (Auteur) This article deals with the results of a user study, which aimed to compare two geovisualization interfaces (one interactive and one animated and interactive) displaying the chain of events during past major floods. Some limitations were identified concerning the variables measured (accuracy and speed of answer) and the tasks to be performed by users. Results have shown that the two common metrics used in map evaluations seem not to be sufficient to reveal differences between map types. Other metrics extracted from the participants’ interaction logs have been used successfully. Finally, to decrease the variability between the results of experiments and to make them more comparable with previous tests, one solution might be to develop and share reference data sets and sets of tasks in several themes, with known cognitive complexities, as is already done in other research fields. Numéro de notice : A2017-320 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1080/23729333.2017.1301347 En ligne : http://dx.doi.org/10.1080/23729333.2017.1301347 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=85377
in International journal of cartography > vol 3 n° 1 (June 2017) . - pp 88 - 101[article]The differentiation of point symbols using selected visual variables in the mobile augmented reality system / Łukasz Halik in Cartographic journal (the), Vol 54 n° 2 (May 2017)
[article]
Titre : The differentiation of point symbols using selected visual variables in the mobile augmented reality system Type de document : Article/Communication Auteurs : Łukasz Halik, Auteur ; Beata Medyńska-Gulij, Auteur Année de publication : 2017 Article en page(s) : pp 147 - 156 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Rédaction cartographique
[Termes IGN] appareil portable
[Termes IGN] figuré ponctuel
[Termes IGN] navigation pédestre
[Termes IGN] piéton
[Termes IGN] Pologne
[Termes IGN] réalité augmentée
[Termes IGN] seuillage
[Termes IGN] symbole graphique
[Termes IGN] test de performance
[Termes IGN] variable visuelleRésumé : (Auteur) On the basis of initial studies devoted to a better understanding of how the public user (a pedestrian in the city) perceives cartographic symbols in the mobile augmented reality system, we present an attempt to determine the threshold values of differentiation for three visual variables. The variables of size, transparency, and focus were implemented into image point symbols representing five types of objects. The set of symbols was designed in accordance with the rules of cartographic design taking into consideration an analysis of 19 professional tourist works. The symbols were presented on the screen of a mobile device in a system imitating the augmented reality system against four different backgrounds: white, a wall, and two typical urban landscapes. The results of an internet survey conducted using a tablet at four locations in Poznan (Poland) allowed us to determine the following: threshold differentiation values for the analysed variables, indication of the dependence on the type of background displayed on the mobile device in augmented reality, and the advantage of using a combination of visual variables. Numéro de notice : A2017-324 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1080/00087041.2016.1253144 En ligne : http://dx.doi.org/10.1080/00087041.2016.1253144 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=85397
in Cartographic journal (the) > Vol 54 n° 2 (May 2017) . - pp 147 - 156[article]Réservation
Réserver ce documentExemplaires(1)
Code-barres Cote Support Localisation Section Disponibilité 030-2017021 RAB Revue Centre de documentation En réserve L003 Disponible An effective approach to estimating computing time of vector data spatial computational domains in WebGIS / Mingqiang Guo in Geomatica, vol 71 n° 1 (March 2017)PermalinkPrototypage de cartes tactiles pour malvoyants à partir de données géographiques / Mohamed Amine Ben Rhaiem (02/2017)PermalinkPermalinkCitizen empowered mapping, ch. 2. Cartographic representation of soundscape: proposals and assessment / Saul Gomez (2017)PermalinkClient and user involvement through BIM-related technologies / Silvia Mastrolembo Ventura in International journal of 3-D information modeling, vol 6 n° 1 (January - March 2017)PermalinkEn finir avec les idées reçues sur la vulgarisation scientifique / Nicolas Beck (2017)PermalinkPersonnalisation des représentations cartographiques en géovisualisation : couleurs et styles / Sidonie Christophe (2017)PermalinkPotentialités de l’outil LiDAR pour cartographier les vestiges de la Grande Guerre en milieu intra-forestier (bois des Caures, forêt domaniale de Verdun, Meuse) / Rémi de Matos Machado in EchoGeo, n° 38 (octobre - décembre 2016)PermalinkOn discovering co-location patterns in datasets : a case study of pollutants and child cancers / Jundong Li in Geoinformatica, vol 20 n° 4 (October - December 2016)PermalinkMobilités à la loupe / Françoise de Blomac in DécryptaGéo le mag, n° 179 (septembre 2016)Permalink