Transactions in GIS . vol 17 n° 4Paru le : 01/08/2013 ISBN/ISSN/EAN : 1361-1682 |
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Ajouter le résultat dans votre panierHow reliable are citizen-derived scientific data? Assessing the quality of contrail observations made by the general public / Amy Fowler in Transactions in GIS, vol 17 n° 4 (August 2013)
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Titre : How reliable are citizen-derived scientific data? Assessing the quality of contrail observations made by the general public Type de document : Article/Communication Auteurs : Amy Fowler, Auteur ; J. Duncan Whyatt, Auteur ; Gemma Davies, Auteur ; Rebecca Ellis, Auteur Année de publication : 2013 Article en page(s) : pp 488 - 506 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Bases de données localisées
[Termes IGN] Angleterre
[Termes IGN] atmosphère terrestre
[Termes IGN] condensation
[Termes IGN] données localisées des bénévoles
[Termes IGN] données météorologiques
[Termes IGN] données multisources
[Termes IGN] fiabilité des données
[Termes IGN] grand public
[Termes IGN] science citoyenneRésumé : (Auteur) Citizen science projects encourage the general public to participate in scientific research. Participants can contribute large volumes of data over broad spatial and temporal frames; however, the challenge is to generate data of sufficient quality to be useable in scientific research. Most observations made by citizen-scientists can be independently verified by “experts”. However, verification is more problematic when the phenomena being recorded are short-lived. This article uses a GIS methodology to verify the quality of contrail observations made by the general public as part of the OPAL Climate Survey. We verify observations using datasets derived from a variety of different sources (experts, models and amateur enthusiasts) with different spatial and temporal properties which reflect the complex 3D nature of the atmosphere. Our results suggest that ~70% of citizen observations are plausible, based on favorable atmospheric conditions and the presence or absence of aircraft; a finding which is in keeping with other, more conventional citizen science projects. However, questions remain as to why the quality of the citizen-based observations was so high. Given the lack of supporting data on observers, it is impossible to determine whether the dataset was generated by the activities of many participants or a small but dedicated number of individual observers. Numéro de notice : A2013-468 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE/INFORMATIQUE/SOCIETE NUMERIQUE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1111/tgis.12034 Date de publication en ligne : 22/05/2013 En ligne : https://doi.org/10.1111/tgis.12034 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=32606
in Transactions in GIS > vol 17 n° 4 (August 2013) . - pp 488 - 506[article]Linking time geography and activity theory to support the activities of mobile information seekers / Paul Crease in Transactions in GIS, vol 17 n° 4 (August 2013)
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Titre : Linking time geography and activity theory to support the activities of mobile information seekers Type de document : Article/Communication Auteurs : Paul Crease, Auteur ; Tumasch Reischenbacher, Auteur Année de publication : 2013 Article en page(s) : pp 507 - 525 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géomatique
[Termes IGN] analyse spatio-temporelle
[Termes IGN] calcul d'itinéraire
[Termes IGN] données spatiotemporelles
[Termes IGN] itinéraire
[Termes IGN] recherche d'information géographique
[Termes IGN] SIG nomade
[Termes IGN] Time-geographyRésumé : (Auteur) Mobile geographic information seeking systems are often employed to support spatial activities in an unfamiliar geographic environment. However, current systems are unable to incorporate the spatio-temporal constraints of these activities in order to support this information seeking. This article describes a methodology addressing the nature of these spatio-temporal activities that has the potential to contribute solutions to this problem. A key element of this approach is the awareness that both the planning and acting phases must be considered in supporting such activities. This means the development of plans that can be amended ad-hoc, whilst still adhering to the spatio-temporal constraints of the activity. The results of such an approach are the ability for a more descriptive representation of a spatio-temporal activity, which can then be used to support spatio-temporal accessibility analyses and disclose geographic information objects that are no longer accessible to the mobile information seeker. The introduction of these spatio-temporal constraints also allows the mobile information seeker to build up an itinerary that adheres to the given spatio-temporal constraints of the activity. Numéro de notice : A2013-469 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1111/tgis.12044 Date de publication en ligne : 02/08/2013 En ligne : https://doi.org/10.1111/tgis.12044 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=32607
in Transactions in GIS > vol 17 n° 4 (August 2013) . - pp 507 - 525[article]The influence of digital surface model choice on visibility-based mobile geospatial applications / Sam Meek in Transactions in GIS, vol 17 n° 4 (August 2013)
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Titre : The influence of digital surface model choice on visibility-based mobile geospatial applications Type de document : Article/Communication Auteurs : Sam Meek, Auteur ; James Goulding, Auteur ; Gary Priestnall, Auteur Année de publication : 2013 Article en page(s) : pp 526 - 543 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications SIG
[Termes IGN] appareil portable
[Termes IGN] données de terrain
[Termes IGN] données lidar
[Termes IGN] modèle numérique de surface
[Termes IGN] point d'intérêt
[Termes IGN] qualité des données
[Termes IGN] service fondé sur la position
[Termes IGN] téléphone intelligent
[Termes IGN] téléphonie mobile
[Termes IGN] visibilitéRésumé : (Auteur) In this work, we investigate the effectiveness of different types of visibility models for use within location-based services. This article outlines the methodology and results for our experiments, which were designed to understand the accuracy and effects of model choices for mobile visibility querying. Harnessing a novel mobile media consumption and authoring application called Zapp, the levels of accuracy of various digital surface representations used by a line of sight visibility algorithm are extensively examined by statistically assessing randomly sampled viewing sites across the 1 km2 study area, in relation to points of interest (POI) across the University of Nottingham campus. Testing was carried out on three different surface models derived from 0.5 m LiDAR data by visiting physical sites on each surface model with 14 random point of interest masks being viewed from between 10 and 16 different locations, totalling 190 data points. Each site was ground-truthed by determining whether a given POI could be seen by the user and could also be identified by the mobile device. Our experiments in a semi-urban area show that choice of surface model has important implications for mobile applications that utilize visibility in geospatial query operations. Numéro de notice : A2013-470 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1111/tgis.12021 Date de publication en ligne : 10/04/2013 En ligne : https://doi.org/10.1111/tgis.12021 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=32608
in Transactions in GIS > vol 17 n° 4 (August 2013) . - pp 526 - 543[article]Assessing the veracity of methods for extracting place semantics from Flickr tags / William A Mackaness in Transactions in GIS, vol 17 n° 4 (August 2013)
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Titre : Assessing the veracity of methods for extracting place semantics from Flickr tags Type de document : Article/Communication Auteurs : William A Mackaness, Auteur ; Omair Chaudhry, Auteur Année de publication : 2013 Article en page(s) : pp 544 - 562 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Bases de données localisées
[Termes IGN] base de données d'images
[Termes IGN] données spatiotemporelles
[Termes IGN] exploration de données
[Termes IGN] grand public
[Termes IGN] image Flickr
[Termes IGN] inférence
[Termes IGN] information sémantique
[Termes IGN] milieu urbain
[Termes IGN] régression logistique
[Termes IGN] segmentation sémantiqueRésumé : (Auteur) The volume and potential value of user generated content (UGC) is ever growing. Multiply sourced, its value is greatly increased by the inclusion of metadata that adequately and accurately describes that content – particularly if such data are to be integrated with more formal data sets. Typically, digital photography is tagged with location and attribute information that variously describe the location, events or objects in the image. Often inconsistent and incomplete, these attributes reflect concepts at a range of geographic scales. From a spatial data integration perspective, the information relating to “place” is of primary interest. The challenge therefore is in selecting the most appropriate tags that best describe the geography of the image. This article presents a methodology based on an information retrieval technique that separates out “place related tags” from the remainder of the tags. Different scales of geography are identified by varying the size of the sampling area within which the imagery falls. This is applied in the context of urban environments, using Flickr imagery. Empirical analysis is then used to assess the correctness of the chosen tags (i.e. whether the tag correctly describes the geographic region in which the image was taken). Logistic regression and Bayesian inference are used to attach a probability value to each place tag. The high correlation values achieved indicate that this methodology can be used to automatically select place tags for any urban region and thus hierarchically structure UGC in order that it can be semantically integrated with other data sources. Numéro de notice : A2013-471 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE/INFORMATIQUE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1111/tgis.12043 Date de publication en ligne : 28/05/2013 En ligne : https://doi.org/10.1111/tgis.12043 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=32609
in Transactions in GIS > vol 17 n° 4 (August 2013) . - pp 544 - 562[article]Temporal uncertainty in a small area open geodemographic classification / Christopher G. Gale in Transactions in GIS, vol 17 n° 4 (August 2013)
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Titre : Temporal uncertainty in a small area open geodemographic classification Type de document : Article/Communication Auteurs : Christopher G. Gale, Auteur ; Paul A. Longley, Auteur Année de publication : 2013 Article en page(s) : pp 563 - 588 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Bases de données localisées
[Termes IGN] analyse diachronique
[Termes IGN] classification
[Termes IGN] données démographiques
[Termes IGN] exploration de données géographiques
[Termes IGN] incertitude temporelle
[Termes IGN] Royaume-UniRésumé : (Auteur) The 2001 Output Area Classification (2001 OAC) is an open source geodemographic classification of the UK built exclusively from 2001 UK Census data. There has been considerable user interest in its applicability to subsequent time periods, particularly given the potential propensity of characteristics and attributes in some areas to change during inter-censual periods. Users often purchase commercial geodemographic classification products in the belief that purely census-based classifications such as the 2001 OAC are uniformly unreliable because there is no temporal updating of input data. Yet there is evidence to suggest that whilst some UK neighborhoods are prone to sudden changes, many others change very little over protracted time periods. Using measures that are available at the small area level, temporal uncertainty indicators can be constructed to identify those areas that are less stable. Using mid-year population estimates and dwelling stock data, this article develops three temporal uncertainty indicators. These provide a reliable means of gauging the stability or otherwise of neighborhood conditions. The conclusion from this is that while a large number of small areas in the UK do experience change over time, this change is not uniform in either degree or distribution, or by geodemographic type. Numéro de notice : A2013-472 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE/INFORMATIQUE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1111/tgis.12035 Date de publication en ligne : 23/05/2013 En ligne : https://doi.org/10.1111/tgis.12035 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=32610
in Transactions in GIS > vol 17 n° 4 (August 2013) . - pp 563 - 588[article]Spatial modeling of the black death in Sweden / Lars Skog in Transactions in GIS, vol 17 n° 4 (August 2013)
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Titre : Spatial modeling of the black death in Sweden Type de document : Article/Communication Auteurs : Lars Skog, Auteur ; Hans Hauska, Auteur Année de publication : 2013 Article en page(s) : pp 589 - 611 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications SIG
[Termes IGN] analyse diachronique
[Termes IGN] analyse spatiale
[Termes IGN] carte thématique
[Termes IGN] épidémie
[Termes IGN] maladie infectieuse
[Termes IGN] modélisation spatiale
[Termes IGN] quatorzième siècle
[Termes IGN] santé
[Termes IGN] Suède
[Termes IGN] système d'information géographique
[Termes IGN] Web Map ServiceRésumé : (Auteur) The purpose of this work is to determine whether spatial modeling can be used to model the spread of the Black Death. The study is limited to models for the propagation of the disease in Sweden in 1350. Geographic data of Swedish water bodies and medieval road networks, historical data on the population in Swedish parishes, including their medieval boundaries, along with historical notes and disease characteristics, were used to build alternative models for spatial distribution. Three different models are presented: one radial, one cost-based and one combining network analysis and radial propagation. Simulations were made to depict different scenarios on the spread of the disease, as well as the drastic changes in the overall population of Sweden, over a couple of hundred years. For purpose of validation the population decrease estimated in each parish is compared with independent historical documents. Results from model scenarios are visualized in maps of propagation, animated video sequences and a web map service. Our analyses clearly demonstrate the power of spatial analysis and geographic information systems to describe, model and visualize epidemiologic processes in space and time. Numéro de notice : A2013-473 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1111/j.1467-9671.2012.01369.x Date de publication en ligne : 02/01/2013 En ligne : https://doi.org/10.1111/j.1467-9671.2012.01369.x Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=32611
in Transactions in GIS > vol 17 n° 4 (August 2013) . - pp 589 - 611[article]Finding science with science: Evaluating a domain and scientific ontology user interface for the discovery of scientific resources / Kristin Stock in Transactions in GIS, vol 17 n° 4 (August 2013)
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Titre : Finding science with science: Evaluating a domain and scientific ontology user interface for the discovery of scientific resources Type de document : Article/Communication Auteurs : Kristin Stock, Auteur ; Vera Karasova, Auteur ; Anne Robertson, Auteur ; et al., Auteur Année de publication : 2013 Article en page(s) : pp 612 - 639 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Informatique
[Termes IGN] étiquette
[Termes IGN] exploration de données
[Termes IGN] interface utilisateur
[Termes IGN] ontologieRésumé : (Auteur) Current approaches to the discovery of scientific resources (publications, data sets and web services) are dominated by keyword search. These approaches do not allow scientists to search on the deeper semantics of scientific resources, or to discover resources on the basis of the scientific approaches taken. This article evaluates a user interface that allows users to discover scientific resources through structured knowledge in the form of ontologies describing the domain and the scientific knowledge inherent within the scientific resource, and also through informal user tags. These combined capabilities provide scientists with new and powerful options for resource discovery. A qualitative user evaluation explored how scientists felt about the approach for resource discovery in the context of their scientific work. The study showed that marine scientists were enthusiastic about the capabilities of such an approach and appreciated the ability to browse the visual structure of the knowledge and query on scientific method but, overall, preferred the use of tags over ontologies. The exploratory nature of the user study was used to identify future directions for such improvements. Numéro de notice : A2013-474 Affiliation des auteurs : non IGN Thématique : INFORMATIQUE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1111/j.1467-9671.2012.01370.x Date de publication en ligne : 26/12/2012 En ligne : https://doi.org/10.1111/j.1467-9671.2012.01370.x Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=32612
in Transactions in GIS > vol 17 n° 4 (August 2013) . - pp 612 - 639[article]