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Timebliography : A dynamic and online bibliography on temporal GIS / Willington Siabato in Transactions in GIS, vol 18 n° 6 (December 2014)  

Public [article]  inTransactions in GIS > vol 18 n° 6 (December 2014) . - pp 799 – 816 Titre : Timebliography : A dynamic and online bibliography on temporal GIS Type de document : Article/Communication Auteurs : Willington Siabato, Auteur ; Christophe Claramunt, Auteur ; Miguel Angel Manso-Callejo, Auteur ; Miguel Ángel Bernabé-Poveda, Auteur Année de publication : 2014 Article en page(s) : pp 799 – 816 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Systèmes d'information géographique [Termes IGN] aide à la décision [Termes IGN] répertoire [Termes IGN] SIG temporel Résumé : (Auteur) This article introduces an online bibliography on temporal GIS, a research area in which different scientific fields and researchers have provided substantial results and literature over the past few years. We first define the scientific domain of temporal GIS, its origin and recent evolution, and the context of this bibliography. Then, the components and functionalities of the web-based application that support the online bibliography are described. The bibliography, entitled TimeBliography, is accessible on the Web at http://spaceandtime.wsiabato.info Numéro de notice : A2014-571 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1111/tgis.12080 Date de publication en ligne : 05/03/2014 En ligne : https://doi.org/10.1111/tgis.12080 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=74761 [article]

Modeling use of space from social media data using a biased random walker / Steven D. Prager in Transactions in GIS, vol 18 n° 6 (December 2014)  

Public [article]  inTransactions in GIS > vol 18 n° 6 (December 2014) . - pp 817 – 833 Titre : Modeling use of space from social media data using a biased random walker Type de document : Article/Communication Auteurs : Steven D. Prager, Auteur ; Paul Wiegand, Auteur Année de publication : 2014 Article en page(s) : pp 817 – 833 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Analyse spatiale [Termes IGN] comportement [Termes IGN] données socio-économiques [Termes IGN] environnement [Termes IGN] modélisation spatiale [Termes IGN] navigation pédestre [Termes IGN] New York (Etats-Unis ; ville) Résumé : (Auteur) Individuals and other entities move through space as a function of local characteristics of place, their internal behavioral models, and the topological structure of the underlying space. When a collection of locations (i.e. geotagged photos or other geotagged social media information) from a large number of individuals is assembled, it becomes possible to understand the interrelationship between the individuals and the space they occupy. This research systematically considers this interrelationship through an examination of the effect of the intersection of behavioral and spatial characteristics on individuals moving on street networks. The research illustrates how social media data, in combination with a biased random walker, can be used to understand and model the interaction of spatial structure and social-environmental factors on influencing individuals' use of their environment. The biased walker offers a flexible approach to incorporate consideration of both social-environmental and structural factors into a model and we demonstrate this through a case study wherein we are able to use the random walker to model the characteristics of Flickr users in New York City. Numéro de notice : A2014-572 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1111/tgis.12069 Date de publication en ligne : 18/11/2013 En ligne : https://doi.org/10.1111/tgis.12069 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=74762 [article]

Collaborative ontology development for the geosciences / Reza Kalbasi in Transactions in GIS, vol 18 n° 6 (December 2014)  

Public [article]  inTransactions in GIS > vol 18 n° 6 (December 2014) . - pp 834 – 851 Titre : Collaborative ontology development for the geosciences Type de document : Article/Communication Auteurs : Reza Kalbasi, Auteur ; Krzysztof Janowicz, Auteur ; F. Reitsma, Auteur ; et al., Auteur Année de publication : 2014 Article en page(s) : pp 834 – 851 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géomatique [Termes IGN] conception collaborative [Termes IGN] ontologie Résumé : (Auteur) Ontology-based information publishing, retrieval, reuse, and integration have become popular research topics to address the challenges involved in exchanging data between heterogeneous sources. However, in most cases ontologies are still developed in a centralized top-down manner by a few knowledge engineers. Consequently, the role that developers play in conceptualizing a domain such as the geosciences is disproportional compared with the role of domain experts and especially potential end-users. These and other drawbacks have stimulated the creation of new methodologies focusing around collaboration. Based on a review of existing approaches, this article presents a two-step methodology and implementation to foster collaborative ontology engineering in the geosciences. Our approach consists of the development of a minimalistic core ontology acting as a catalyst and the creation of a virtual collaborative development cycle. Both methodology and prototypical implementation have been tested in the context of the EU-funded ForeStClim project which addresses environmental protection with respect to forests and climate change. Numéro de notice : A2014-573 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1111/tgis.12070 Date de publication en ligne : 11/11/2013 En ligne : https://doi.org/10.1111/tgis.12070 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=74763 [article]

Exploring and visualizing differences in geographic and linguistic web coverage / Ramya Venkateswaran in Transactions in GIS, vol 18 n° 6 (December 2014)  

Public [article]  inTransactions in GIS > vol 18 n° 6 (December 2014) . - pp 852 – 876 Titre : Exploring and visualizing differences in geographic and linguistic web coverage Type de document : Article/Communication Auteurs : Ramya Venkateswaran, Auteur ; Robert Weibel, Auteur ; Ross S. Purves, Auteur Année de publication : 2014 Article en page(s) : pp 852 – 876 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géomatique web [Termes IGN] couverture (données géographiques) [Termes IGN] densité de population [Termes IGN] exploration de données [Termes IGN] information géographique [Termes IGN] langage naturel (informatique) [Termes IGN] Suisse [Termes IGN] visualisation de données Résumé : (Auteur) This article reports on a study performed to understand the geographic and linguistic coverage of web resources, focusing on the example of tourism-related themes in Switzerland. Search engine queries of web documents were used to gather counts for phrases in four different languages. The study focused on selected populated places and tourist attractions in Switzerland from three gazetteer datasets: topographic gazetteer data from the Swiss national mapping agency (SwissTopo); POI data from a commercial data provider (Tele Atlas) and user generated geographic content (geonames.org). The web counts illustrate the geographic extent and trends of web coverage of tourism for different languages. Results show that coverage for local languages, i.e. German, French and Italian, is more strongly related to the region of the spoken language. Correlation of the web counts to typical tourism indicators, e.g. population and number of hotel nights rented per year, are also computed and compared. Numéro de notice : A2014-574 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1111/tgis.12071 Date de publication en ligne : 27/01/2014 En ligne : https://doi.org/10.1111/tgis.12071 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=74764 [article]

A comprehensive framework for intrinsic OpenStreetMap quality analysis / Christopher Barron in Transactions in GIS, vol 18 n° 6 (December 2014)  

Public [article]  inTransactions in GIS > vol 18 n° 6 (December 2014) . - pp 877 – 895 Titre : A comprehensive framework for intrinsic OpenStreetMap quality analysis Type de document : Article/Communication Auteurs : Christopher Barron, Auteur ; Pascal Neis, Auteur ; Alexander Zipf, Auteur Année de publication : 2014 Article en page(s) : pp 877 – 895 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géomatique web [Termes IGN] analyse comparative [Termes IGN] données localisées des bénévoles [Termes IGN] OpenStreetMap [Termes IGN] qualité des données Résumé : (Auteur) OpenStreetMap (OSM) is one of the most popular examples of a Volunteered Geographic Information (VGI) project. In the past years it has become a serious alternative source for geodata. Since the quality of OSM data can vary strongly, different aspects have been investigated in several scientific studies. In most cases the data is compared with commercial or administrative datasets which, however, are not always accessible due to the lack of availability, contradictory licensing restrictions or high procurement costs. In this investigation a framework containing more than 25 methods and indicators is presented, allowing OSM quality assessments based solely on the data's history. Without the usage of a reference data set, approximate statements on OSM data quality are possible. For this purpose existing methods are taken up, developed further, and integrated into an extensible open source framework. This enables arbitrarily repeatable intrinsic OSM quality analyses for any part of the world. Numéro de notice : A2014-575 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE/SOCIETE NUMERIQUE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1111/tgis.12073 Date de publication en ligne : 23/12/2013 En ligne : https://doi.org/10.1111/tgis.12073 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=74765 [article]

Noisy data smoothing in DEM construction using least squares support vector machines / C. Chen in Transactions in GIS, vol 18 n° 6 (December 2014)  

Public [article]  inTransactions in GIS > vol 18 n° 6 (December 2014) . - pp 896 – 910 Titre : Noisy data smoothing in DEM construction using least squares support vector machines Type de document : Article/Communication Auteurs : C. Chen, Auteur ; Y. Li, Auteur ; H. Dai, Auteur ; et al., Auteur Année de publication : 2014 Article en page(s) : pp 896 – 910 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications photogrammétriques [Termes IGN] bruit (théorie du signal) [Termes IGN] données lidar [Termes IGN] modèle numérique du bâti [Termes IGN] séparateur à vaste marge Résumé : (Auteur) Since spatial datasets are subject to sampling errors, a smoothing interpolation method should be employed to remove noise during DEM construction. Although least squares support vector machines (LSSVM) have been widely accepted as a classifier, their effect on smoothing noisy data is almost unknown. In this article, the smoothness of LSSVM was explored, and its effect on smoothing noisy data in DEM construction was tested. In order to improve the ability to deal with large datasets, a local method of LSSVM has been developed, where only the neighboring sampling points around the one to be estimated are used for computation. A numerical test indicated that LSSVM is more accurate than the classical smoothing methods including TPS and kriging, and its error surfaces are more evenly distributed. The real-world example of smoothing noise inherent in lidar-derived DEMs also showed that LSSVM has a positive smoothing effect, which is approximately as accurate as TPS. In short, LSSVM with a high efficiency can be considered as an alternative smoothing method for smoothing noisy data in DEM construction. Numéro de notice : A2014-576 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1111/tgis.12078 Date de publication en ligne : 26/02/2014 En ligne : https://doi.org/10.1111/tgis.12078 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=74766 [article]

Detecting and analyzing mobility hotspots using surface networks / Y. Hu in Transactions in GIS, vol 18 n° 6 (December 2014)  

Public [article]  inTransactions in GIS > vol 18 n° 6 (December 2014) . - pp 911 – 935 Titre : Detecting and analyzing mobility hotspots using surface networks Type de document : Article/Communication Auteurs : Y. Hu, Auteur ; Harvey J. Miller, Auteur ; X. Li, Auteur Année de publication : 2014 Article en page(s) : pp 911 – 935 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Analyse spatiale [Termes IGN] estimation par noyau [Termes IGN] mobilité humaine [Termes IGN] objet mobile [Termes IGN] Shanghai (Chine) [Termes IGN] théorie des graphes [Termes IGN] topologie Résumé : (Auteur) Capabilities for collecting and storing data on mobile objects have increased dramatically over the past few decades. A persistent difficulty is summarizing large collections of mobile objects. This article develops methods for extracting and analyzing hotspots or locations with relatively high levels of mobility activity. We use kernel density estimation (KDE) to convert a large collection of mobile objects into a smooth, continuous surface. We then develop a topological algorithm to extract critical geometric features of the surface; these include critical points (peaks, pits and passes) and critical lines (ridgelines and course-lines). We connect the peaks and corresponding ridgelines to produce a surface network that summarizes the topological structure of the surface. We apply graph theoretic indices to analytically characterize the surface and its changes over time. To illustrate our approach, we apply the techniques to taxi cab data collected in Shanghai, China. We find increases in the complexity of the hotspot spatial distribution during normal activity hours in the late morning, afternoon and evening and a spike in the connectivity of the hotspot spatial distribution in the morning as taxis concentrate on servicing travel to work. These results match with scientific and anecdotal knowledge about human activity patterns in the study area. Numéro de notice : A2014-577 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1111/tgis.12076 Date de publication en ligne : 17/02/2014 En ligne : https://doi.org/10.1111/tgis.12076 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=74767 [article]

Integrating a raster geographical information system with multi-objective land allocation optimization for conservation reserve design / WeiWei Dai in Transactions in GIS, vol 18 n° 6 (December 2014)  

Public [article]  inTransactions in GIS > vol 18 n° 6 (December 2014) . - pp 936 – 949 Titre : Integrating a raster geographical information system with multi-objective land allocation optimization for conservation reserve design Type de document : Article/Communication Auteurs : WeiWei Dai, Auteur ; Samuel J. Ratick, Auteur Année de publication : 2014 Article en page(s) : pp 936 – 949 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géomatique [Termes IGN] algorithme évolutionniste [Termes IGN] Bolivie [Termes IGN] implémentation (informatique) [Termes IGN] optimisation (mathématiques) [Termes IGN] réserve naturelle [Termes IGN] système d'aide à la décision [Termes IGN] système d'information géographique Résumé : (Auteur) The multi-objective land allocation problem is to optimize the selection of land for different uses based on a set of decision objectives. For most applications, a geographical information system (GIS) is either absent or loosely coupled through file exchange. In this article the evolutionary algorithm (EA), a heuristic solution method for optimization problems, is integrated with a raster GIS to form a spatial decision support system (SDSS) for multi-objective conservation reserve design. The SDSS effectively combines the functions of a GIS for data management, analysis, and visualization, with the optimization capability of the EA; and provides a uniform way to solve conservation reserve design problems with different types of constraints and objectives. The SDSS is demonstrated through application to the creation of conservation reserves in Bolivia to protect 17 endemic mammals. Numéro de notice : A2014-578 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1111/tgis.12085 Date de publication en ligne : 19/03/2014 En ligne : https://doi.org/10.1111/tgis.12085 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=74768 [article]