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Scalable and privacy-respectful interactive discovery of place semantics from human mobility traces / Natalia Andrienko in Information visualization, vol 15 n° 2 (April 2016)
[article]
Titre : Scalable and privacy-respectful interactive discovery of place semantics from human mobility traces Type de document : Article/Communication Auteurs : Natalia Andrienko, Auteur ; Gennady Andrienko, Auteur ; Georg Fuchs, Auteur ; Piotr Jankowski, Auteur Année de publication : 2016 Article en page(s) : pp 117 - 153 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Termes IGN] analyse géovisuelle
[Termes IGN] analyse multicritère
[Termes IGN] données spatiotemporelles
[Termes IGN] information sémantique
[Termes IGN] migration pendulaire
[Termes IGN] mobilité urbaine
[Termes IGN] protection de la vie privée
[Termes IGN] réseau social
[Termes IGN] téléphone intelligent
[Termes IGN] trace GPS
[Vedettes matières IGN] GéovisualisationRésumé : (auteur) Mobility diaries of a large number of people are needed for assessing transportation infrastructure and spatial development planning. Acquisition of personal mobility diaries through population surveys is a costly and error-prone endeavour. We examine an alternative approach to obtaining similar information from episodic digital traces of people’s presence in various locations, which appear when people use their mobile devices for making phone calls, accessing the Internet or posting georeferenced contents (texts, photos or videos) in social media. Having episodic traces of a person over a long time period, it is possible to detect significant (repeatedly visited) personal places and identify them as home, work or place of social activities based on temporal patterns of a person’s presence in these places. Such analysis, however, can lead to compromising personal privacy. We have investigated the feasibility of deriving place meanings and reconstructing personal mobility diaries while preserving the privacy of individuals whose data are analysed. We have devised a visual analytics approach and a set of supporting tools making such privacy-preserving analysis possible. The approach was tested in two case studies with publicly available data: simulated tracks from the VAST Challenge 2014 and real traces built from georeferenced Twitter posts. Numéro de notice : A2016--019 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article DOI : 10.1177/1473871615581216 En ligne : https://doi.org/10.1177/1473871615581216 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=83874
in Information visualization > vol 15 n° 2 (April 2016) . - pp 117 - 153[article]
Titre : Crowd-sourced reconstruction of building interiors Type de document : Thèse/HDR Auteurs : Michael Peter, Auteur ; Dieter Fritsch, Directeur de thèse Editeur : Munich : Bayerische Akademie der Wissenschaften Année de publication : 2016 Collection : DGK - C, ISSN 0065-5325 num. 768 Importance : 147 p. ISBN/ISSN/EAN : 978-3-7696-5180-5 Note générale : bibliographie Langues : Anglais (eng) Allemand (ger) Descripteur : [Vedettes matières IGN] Applications photogrammétriques
[Termes IGN] carte d'intérieur
[Termes IGN] cartographie collaborative
[Termes IGN] données localisées des bénévoles
[Termes IGN] échelle cartographique
[Termes IGN] image binaire
[Termes IGN] modélisation 2D
[Termes IGN] modélisation 3D du bâti BIM
[Termes IGN] navigation à l'estime
[Termes IGN] numérisation de carte
[Termes IGN] plan incendie
[Termes IGN] positionnement en intérieur
[Termes IGN] segmentation binaire
[Termes IGN] squelettisation
[Termes IGN] trace GPSRésumé : (auteur) Location-based services (LBS) have gained huge commercial and scientific interest in recent years, due to the ubiquitous and free availability of maps, global positioning systems, and smartphones. To date, maps and positioning solutions are mostly only available for outdoor use. However, humans spend most of their time indoors, rendering indoor LBS interesting for applications such as location-based advertisement, customer tracking and customer flow analysis. Neither of the two prerequisites for indoor LBS - a map of the user's environment and a positioning system - is currently generally available: Most positioning methods currently under scientific investigation are based either on fingerprint maps of electro-magnetic signals (e.g. WiFi) or inertial measurement units. To overcome the flaws of these methods, they are often supported by models for the human movement which in turn rely on indoor maps. Ready-made maps, on the other hand, are generally unavailable due to indoor mapping being mostly manual, expensive and tedious. The vast amount of unmapped indoor space therefore calls for the transfer of methods used by Volunteered Geographic Information (VGI) communities like OpenStreetMap to indoor mapping. These methods comprise the digitization of features of interest such as building outlines from aerial images released to the community and the use of position traces. In this thesis, approaches are illustrated which can serve to enable this transfer. On the one hand, the thesis shows how photographs of evacuation plans - which are a compulsory part of the safety equipment of publicly used buildings in many countries - can substitute for the aerial images in the indoor domain. Due to the standardised nature of such plans, the manual digitization employed by VGI mappers in the outdoor domain can be replaced by an automatic reverse-engineering pipeline. To this end, the image is pre-processed and symbols, which depict evacuation routes or emergency equipment, are detected. Subsequently, foreground objects (i.e. walls) are distinguished from the background using an adequate binarisation operation. Based on the binary image, the sought-after vector information can be extracted by skeletonisation and skeleton tracing. The model is finalised by a bridging operation of the previously detected symbols which occlude parts of walls or stairs. As the model resulting from these operations is only available in a coordinate system defined by the original image, the transformation to a world-coordinate system or, at least, the unknown scale has to be determined. To this end, the indoor model is matched to an available model of the building's external shell. By detection of stairs, an approximate floor height can be computed and the 2D model is extruded to a 3D model. On the other hand, geometric features and semantic annotations may be added to existing models using pedestrian traces recorded by an indoor positioning system. As suitable generally available and low-cost systems do not exist yet, their existence is simulated in this work by a dead-reckoning system basing on a foot-mounted inertial measurement system. Methods for the derivation of the initial position and orientation necessary for the application of such a system are shown, as well as methods enabling the correction of remaining errors. The latter comprise an alignment approach using the external building shell and a map-matching method which employs the existing coarse model derived from the evacuation plan. Building on the collected pedestrian traces, semi-automatic and automatic approaches for the existing models' semantic and geometric refinement are presented which range from semantic annotation using the analysis of photographed doorplates to automatic door reconstruction. Furthermore, a geometric update of single rooms by conjoint analysis of the coarse model, pedestrian traces and a hand-held low-cost range camera is described. Lastly, works of indoor mapping are presented which are based on pedestrian traces and higher-level knowledge about the interior structure of the building modelled in an indoor grammar. Due to the differing characteristics of the two central elements of building interiors, corridors and rooms, the grammar is composed of a Lindenmayer system modelling the floor's corridor system and a split grammar describing the room layout which is found in the non-corridor spaces. The grammar is put to the test by applying it to distributedly collected noisy trace data. Numéro de notice : 19790 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE/INFORMATIQUE Nature : Thèse étrangère Note de thèse : PhD Dissertation : Photogrammetry : Stuttgart : 2016 nature-HAL : Thèse DOI : 10.18419/opus-8729 En ligne : http://doi.org/10.18419/opus-8729 Format de la ressource électronique : URL Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=85009 A temporal-contextual analysis of urban dynamics using location-based data / A. Yair Grinberger in International journal of geographical information science IJGIS, vol 29 n° 11 (November 2015)
[article]
Titre : A temporal-contextual analysis of urban dynamics using location-based data Type de document : Article/Communication Auteurs : A. Yair Grinberger, Auteur ; Noam Shoval, Auteur Année de publication : 2015 Article en page(s) : pp 1969 - 1987 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Analyse spatiale
[Termes IGN] analyse spatio-temporelle
[Termes IGN] dynamique spatiale
[Termes IGN] enrichissement sémantique
[Termes IGN] information sémantique
[Termes IGN] itinéraire
[Termes IGN] Jérusalem
[Termes IGN] mobilité urbaine
[Termes IGN] modèle numérique de déplacement
[Termes IGN] positionnement par GPS
[Termes IGN] prise en compte du contexte
[Termes IGN] trace numérique
[Termes IGN] zone urbaineRésumé : (Auteur) The dynamics of urban activities in Jerusalem were studied by analyzing a large-scale semantically rich movement dataset. The semantic enrichment process was based on coupling movement trajectories sampled by GPS loggers with contextual data derived from trajectory-based digital activity dairies. Although the utility of such procedures in generating trajectory-specific semantic data was noted before, their application stays limited. In this paper, we promote the utilization of these procedures by demonstrating that they are not only feasible but also important for mobility studies. We discuss the characteristics of the semantic enrichment process and the manner by which it was applied within the large-scale analysis of urban dynamics. This application uncovered a time- and context-dependent array of centers in Jerusalem, resulting in a semantically rich characterization of urban dynamics. Such characterization provides otherwise unobtainable insights crucial for urban analysis. Wider implications for movement studies may be derived, as this application demonstrates how diary-based enrichment approaches hold the potential to advance bridging the semantic gap in mobility research. Numéro de notice : A2015-615 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE/URBANISME Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1080/13658816.2015.1049951 En ligne : https://doi.org/10.1080/13658816.2015.1049951 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=78082
in International journal of geographical information science IJGIS > vol 29 n° 11 (November 2015) . - pp 1969 - 1987[article]Trajectory reconstruction from mobile positioning data using cell-to-cell travel time information / Toivo Vajakas in International journal of geographical information science IJGIS, vol 29 n° 11 (November 2015)
[article]
Titre : Trajectory reconstruction from mobile positioning data using cell-to-cell travel time information Type de document : Article/Communication Auteurs : Toivo Vajakas, Auteur ; Jaan Vajakas, Auteur ; Rauni Lillemets, Auteur Année de publication : 2015 Article en page(s) : pp 1941 - 1954 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Navigation et positionnement
[Termes IGN] dimension temporelle
[Termes IGN] géopositionnement
[Termes IGN] lever mobile
[Termes IGN] reconstruction d'itinéraire ou de trajectoire
[Termes IGN] trace numérique
[Termes IGN] trafic routierRésumé : (Auteur) This paper proposes a technique for improving the accuracy of mobile device movement trajectory reconstruction using passive mobile positioning data. The major sources of uncertainty in trajectory reconstruction are imprecise cell shape data and ‘ping-pong’ effects caused by cell handovers. We used a novel technique for improved ‘ping-pong’ effect suppression by compensating for some cell shape distortions based on temporal cell-to-cell transit statistics. The results were evaluated by estimating traffic flow using trajectory reconstruction. The proposed technique improved the accuracy of results compared to ‘ping-pong’ suppression algorithms found in the literature. Numéro de notice : A2015-613 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1080/13658816.2015.1049540 En ligne : https://doi.org/10.1080/13658816.2015.1049540 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=78077
in International journal of geographical information science IJGIS > vol 29 n° 11 (November 2015) . - pp 1941 - 1954[article]Toponym recognition in custom-made map titles / Catherine Dominguès in International journal of cartography, vol 1 n° 1 (August 2015)
[article]
Titre : Toponym recognition in custom-made map titles Type de document : Article/Communication Auteurs : Catherine Dominguès , Auteur ; Iris Eshkol-Taravella, Auteur Année de publication : 2015 Article en page(s) : pp 109 - 120 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géomatique
[Termes IGN] carte topographique
[Termes IGN] corpus
[Termes IGN] géobalise
[Termes IGN] prise en compte du contexte
[Termes IGN] répertoire toponymique
[Termes IGN] toponyme
[Termes IGN] traitement du langage naturelMots-clés libres : toponym subjective toponym web corpus natural language processing gazetteer Résumé : (auteur) The titles of customized topographic maps constitute a specific corpus which is characterized by a very significant number of place names and spelling variations. This paper is about identifying toponyms in these titles. The toponym tracking is based on gazetteers as well as light parsing according to patterns. The method used broadens the definition of the toponym to include the nature of the corpus and the data in it. It consists of seven successive stages where both the extralinguistic context – in this case toponym georeferencing – and the linguistic context are taken into account. Mistakes in tagging are analyzed from the corpus characteristics and the results of each step tagging are evaluated (recall, precision, F-measure). Different conclusions can be suggested: (i) toponym recognition in web corpora should take into account spelling changes, (ii) toponym recognition cannot be limited to gazetteer proper nouns, (iii) the notion of subjective toponym is relevant in this specific corpus, and could be considered with reference to the customization of maps. Numéro de notice : A2015-404 Affiliation des auteurs : LASTIG COGIT+Ext (2012-2019) Thématique : GEOMATIQUE/TOPONYMIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1080/23729333.2015.1055935 Date de publication en ligne : 07/08/2015 En ligne : https://doi.org/10.1080/23729333.2015.1055935 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=76891
in International journal of cartography > vol 1 n° 1 (August 2015) . - pp 109 - 120[article]Recommendations in location-based social networks: a survey / Jie Bao in Geoinformatica, vol 19 n° 3 (July - September 2015)PermalinkPermalinkMining trajectory data and geotagged data in social media for road map inference: Mining social media for road map inference / Jun Li in Transactions in GIS, vol 19 n° 1 (February 2015)PermalinkDetection of potential updates of authoritative spatial databases by fusion of Volunteered Geographical Information from different sources / Stefan Ivanovic (2015)PermalinkEfficient continuous top-k spatial keyword queries on road networks / Long Guo in Geoinformatica, vol 19 n° 1 (January - March 2015)PermalinkPermalinkThree dimensional volunteered geographic information: A prototype of a social virtual globe / Maria Antonia Brovelli in International journal of 3-D information modeling, vol 3 n° 2 (April - June 2014)PermalinkAnalyse des préférences spatiales de la faune à partir de différentes sources de données géographiques / Laurence Jolivet (2014)PermalinkUser-side adaptive protection of location privacy in participatory sensing / Becker Agir in Geoinformatica, vol 18 n° 1 (January 2014)PermalinkLa construction d'une matrice de flux à partir de traces de téléphones portables / Françoise Bahoken in Cartes & Géomatique, n° 217 (septembre 2013)PermalinkGeo-tagged Twitter collection and visualization system / Hideyuki Fujita in Cartography and Geographic Information Science, vol 40 n° 3 (June 2013)PermalinkUsing reverse viewshed analysis to assess the location correctness of visually generated VGI / Hansi Senaratne in Transactions in GIS, vol 17 n° 3 (June 2013)PermalinkBeyond the geotag: situating ‘big data’ and leveraging the potential of the geoweb / Jeremy W. Crampton in Cartography and Geographic Information Science, vol 40 n° 2 (March 2013)PermalinkDesigning origin-destination flow matrices from individual mobile phone paths : the effect of spatiotemporal filtering on flow measurement / Françoise Bahoken (2013)PermalinkAn ontology-based approach to incorporate user-generated geo-content into SDI / D.P. Deng (20/10/2011)PermalinkWeka-STPM: a software architecture and prototype for semantic trajectory data mining and visualization / Vania Bogorny in Transactions in GIS, vol 15 n° 2 (April 2011)PermalinkPermalinkGeotagging is here to stay / Anonyme in GEO: Geoconnexion international, vol 9 n° 2 (february 2010)PermalinkAcquisition de connaissances sur les déplacements quotidiens des individus dans un contexte de risques naturels : Protocoles d’enquête à l’aide de technologies mobiles / Sidonie Christophe (2010)PermalinkEvery thing will be geo-tagged: local search media become social and mobile in 2010 finally / F. Fischer in Geoinformatics, vol 13 n° 1 (01/01/2010)PermalinkBluetooth tracking: a spy in your pocket / B. Van Londersele in GIM international, vol 23 n° 11 (November 2009)PermalinkLe "geotagging" en toute confiance / Anonyme in Géomatique expert, n° 71 (octobre - novembre 2009)PermalinkPermalink