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SELF: Semantically Enriched Line simpliFication / Emmanuel Stefanakis in International journal of geographical information science IJGIS, vol 29 n° 10 (October 2015)  

Public [article]  inInternational journal of geographical information science IJGIS > vol 29 n° 10 (October 2015) . - pp 1826 - 1844 Titre : SELF: Semantically Enriched Line simpliFication Type de document : Article/Communication Auteurs : Emmanuel Stefanakis, Auteur Année de publication : 2015 Article en page(s) : pp 1826 - 1844 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Bases de données localisées [Termes IGN] attribut sémantique [Termes IGN] extension temporelle [Termes IGN] généralisation cartographique automatisée [Termes IGN] polyligne [Termes IGN] représentation cartographique [Termes IGN] simplification de contour [Termes IGN] système d'extension spatial Résumé : (Auteur) Linear features are represented on paper or digital maps with polyline geometries. Sampling, discretization, and generalization processes result in polylines of a length smaller than that of the actual features. In addition, semantics associated to the original line features may be lost. This becomes more significant for coarse sampling and/or high degree of generalization. This paper introduces a data structure that can alleviate this problem, by preserving the attributes and semantic characteristics associated to the original features in cartographic representation. The structure can handle both linear features and polygon outlines. Various compression methods have been examined. The structure has been implemented and tested with both synthetic and real datasets. Extensions to spatiotemporal features, like trajectories, have also been considered. Numéro de notice : A2015-611 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1080/13658816.2015.1053092 En ligne : https://doi.org/10.1080/13658816.2015.1053092 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=78041 [article]

A method for discovery and analysis of temporal patterns in complex event data / Donna J. Peuquet in International journal of geographical information science IJGIS, vol 29 n° 9 (September 2015)  

Public [article]  inInternational journal of geographical information science IJGIS > vol 29 n° 9 (September 2015) . - pp 1588 - 1611 Titre : A method for discovery and analysis of temporal patterns in complex event data Type de document : Article/Communication Auteurs : Donna J. Peuquet, Auteur ; Anthony C. Robinson, Auteur ; Samuel Stehle, Auteur ; et al., Auteur Année de publication : 2015 Article en page(s) : pp 1588 - 1611 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Analyse spatiale [Termes IGN] analyse spatio-temporelle [Termes IGN] découverte de connaissances [Termes IGN] données spatiotemporelles [Termes IGN] événement [Termes IGN] extension temporelle Mots-clés libres : T-pattern analysis  STempo Résumé : (Auteur) Pattern analysis techniques currently common within geography tend to focus either on characterizing patterns of spatial and/or temporal recurrence of a single event type (e.g., incidence of flu cases) or on comparing sequences of a limited number of event types where relationships between events are already represented in the data (e.g., movement patterns). The availability of large amounts of multivariate spatiotemporal data, however, requires new methods for pattern analysis. Here, we present a technique for finding associations among many different event types where the associations among these varying event types are not explicitly represented in the data or known in advance. This pattern discovery method, known as T-pattern analysis, was first developed within the field of psychology for the purpose of finding patterns in personal interactions. We have adapted and extended the T-pattern method to take the unique characteristics of geographic data into account and implemented it within a geovisualization toolkit for an integrated computational-geovisual environment we call STempo. To demonstrate how T-pattern analysis can be employed in geographic research for discovering patterns in complex spatiotemporal data, we describe a case study featuring events from news reports about Yemen during the Arab Spring of 2011–2012. Using supplementary data from the Global Database of Events, Language, and Tone, we briefly summarize and reference a separate validation study, then evaluate the scalability of the T-pattern approach. We conclude with ideas for further extensions of the T-pattern technique to increase its utility for spatiotemporal analysis. Numéro de notice : A2015-608 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1080/13658816.2015.1042380 En ligne : https://doi.org/10.1080/13658816.2015.1042380 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=78037 [article]

Indeterminacy and spatiotemporal data: Basic definitions and case study / Dieter Pfoser in Geoinformatica, vol 9 n° 3 (September - November 2005)  

Public [article]  inGeoinformatica > vol 9 n° 3 (September - November 2005) . - pp 211 - 236 Titre : Indeterminacy and spatiotemporal data: Basic definitions and case study Type de document : Article/Communication Auteurs : Dieter Pfoser, Auteur ; Nectaria Tryfona, Auteur ; C. Jensen, Auteur Année de publication : 2005 Article en page(s) : pp 211 - 236 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Information géographique [Termes IGN] données spatiotemporelles [Termes IGN] extension temporelle [Termes IGN] incertitude de position [Termes IGN] incertitude géométrique [Termes IGN] logique floue [Termes IGN] modélisation spatio-temporelle [Termes IGN] objet géographique [Termes IGN] objet mobile Résumé : (Auteur) For some spatiotemporal applications, it can be assumed that the modeled world is precise and bounded, and that also our record of it is precise. While these simplifying assumptions are sufficient in applications like a land information system, they are unnecessarily crude for many other applications that manage data with spatial and/or temporal extents, such as navigational applications. This work explores fuzziness and uncertainty, subsumed under the term indeterminacy, in the spatiotemporal context. To better illustrate the basic spatiotemporal concepts of change or evolution, it is shown how the fundamental modeling concepts of spatial objects, attributes, and relationships and time points and periods are influenced by indeterminacy and how they can be combined. In particular, the focus is on the change of spatial objects and their geometries across time. Four change scenarios are outlined, which concern discrete versus continuous change and asynchronous versus synchronous measurement, and it is shown how to model indeterminacy for each. A case study illustrates the applicability of the paper's general proposal by describing the uncertainty related to the management of the movements of point objects, such as the management of vehicle positions in a fleet management system. Numéro de notice : A2005-325 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article DOI : 10.1007/s10707-005-1282-4 En ligne : https://doi.org/10.1007/s10707-005-1282-4 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=27461 [article]

Exemplaires(1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
057-05031	RAB	Revue	Centre de documentation	En réserve L003	Disponible

Development of a temporal extension to query travel behavior time paths using an object-oriented GIS / A. Frihida in Geoinformatica, vol 8 n° 3 (septembre - novembre 2004)  

Public [article]  inGeoinformatica > vol 8 n° 3 (septembre - novembre 2004) . - pp 211 - 235 Titre : Development of a temporal extension to query travel behavior time paths using an object-oriented GIS Type de document : Article/Communication Auteurs : A. Frihida, Auteur ; D. Marceau, Auteur ; M. Theriault, Auteur Année de publication : 2004 Article en page(s) : pp 211 - 235 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Systèmes d'information géographique [Termes IGN] extension temporelle [Termes IGN] implémentation (informatique) [Termes IGN] mobilité humaine [Termes IGN] modèle conceptuel de données spatio-temporelles [Termes IGN] modèle orienté objet [Termes IGN] prédicat [Termes IGN] processus spatio-temorel [Termes IGN] requête spatiotemporelle [Termes IGN] SIG 3D Résumé : (Auteur) An essential requirement to better understand activity-based travel behavior (ABTB) at the disaggregate level is the development of a spatio-temporal model able to support queries related to activities of individuals or groups of individuals. This paper describes the development and implementation of a temporal extension to a geographic information system (GIS) object-oriented model for the modeling of the time path and the retrieval of its event chaining. In this approach, time path is formulated as a totally time ordered set composed by activity events and trip events, themselves organized into time ordered sets. As sets, the time path and its components can be searched using their respective indexes. A series of methods were built that implement temporal predicates as an interface to temporally query the database. A set of positional operator methods were also designed that transform temporal topological queries into retrieval functions based on set ordering indices. Taken together, the temporal predicates and the positional operator methods define a temporal query extension that meets the retrieval needs of an ABTB database. Numéro de notice : A2004-324 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE/INFORMATIQUE Nature : Article DOI : 10.1023/B:GEIN.0000034819.57376.92 En ligne : https://doi.org/10.1023/B:GEIN.0000034819.57376.92 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=26851 [article]

Exemplaires(1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
057-04031	RAB	Revue	Centre de documentation	En réserve L003	Disponible