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Citizens as sensors for natural hazards: a VGI integration workflow / B. De Longueville in Geomatica, vol 64 n° 1 (March 2010)
[article]
Titre : Citizens as sensors for natural hazards: a VGI integration workflow Type de document : Article/Communication Auteurs : B. De Longueville, Auteur ; G. Luraschi, Auteur ; P. Smits, Auteur ; et al., Auteur Année de publication : 2010 Article en page(s) : pp 41 - 59 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Infrastructure de données
[Termes IGN] données localisées des bénévoles
[Termes IGN] fiabilité des données
[Termes IGN] flux de travaux
[Termes IGN] participation du public
[Termes IGN] qualité des données
[Termes IGN] risque naturel
[Termes IGN] web 2.0Résumé : (Auteur) Recent advances of the Internet, often subsumed under the term Web 2.0, have led to an unprecedented increase of contents created by non-specialist users. The term Volunteered Geographic Information (VGI) is now commonly used when such user-generated contents have an explicit reference to a geographic location. VGI has significant potential as a timely and cost-effective means to enhance our overall understanding of the Earth. However, integrating VGI into specialist-driven Information Systems is a major challenge, as it is often regarded as insufficiently structured, documented, or validated. In this paper, we address the research question of how the credibility of VGI can be increased, so that it becomes a valuable resource, within domains such as natural hazards. This is done by proposing a generic workflow that uses prior information about the phenomenon of interest and reasoning techniques to improve the reliability of the VGI, thus creating a useful source for scientific and technical investigation. This workflow has been developed for a particular case study: the use of pictures from the photo-sharing portal Flickr as a 'signal' that allows the pinpointing of recent flood events in the United Kingdom. A comparison of the work-flow's output with independent information provided by scientists and journalists about these floods is also presented in order to uncover some of the strengths and weaknesses of VGI in our case study. We conclude that the proposed workflow allows VGI to be turned into a reliable data source. Numéro de notice : A2010-264 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE/SOCIETE NUMERIQUE Nature : Article DOI : 10.5623/geomat-2010-0005 En ligne : https://cdnsciencepub.com/doi/abs/10.5623/geomat-2010-0005 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=30458
in Geomatica > vol 64 n° 1 (March 2010) . - pp 41 - 59[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 035-2010011 RAB Revue Centre de documentation En réserve L003 Disponible Establishment of an empirical Geoid Model for a small geographic area: a case study of Port Harcourt, Nigeria / J. Olaleye in SaLIS Surveying and land information science, vol 70 n° 1 (Spring 2010)
[article]
Titre : Establishment of an empirical Geoid Model for a small geographic area: a case study of Port Harcourt, Nigeria Type de document : Article/Communication Auteurs : J. Olaleye, Auteur ; K. Aleem, Auteur ; et al., Auteur Année de publication : 2010 Article en page(s) : pp 39 - 48 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie physique
[Termes IGN] altitude orthométrique
[Termes IGN] géoïde local
[Termes IGN] Nigéria
[Termes IGN] port
[Termes IGN] système de référence localRésumé : (Auteur) It is well known that the determination of the geoid model especially by the classical gravimetric approach is not a simple task. Consequently, an empirical method is often adopted for a small geographic area. This approach is especially useful because of its simplicity, accessibility to local surveyors, and its adequacy for many applications involving the conversion of World Geodetic System 1984 (WGS 84) GPS heights to a local height reference system based on the Mean Sea Level (MSL). This paper details the procedures and processes used to establish, validate, and consider the statistical significance of a predictive geoid model for a small geographic area. The model is based on data acquired within the central areas of the Port Harcourt metropolis in southern Nigeria. The MSL benchmark of the Nigerian Ports Authority (NPA) in Port Harcourt, which was established during the colonial administration, served as the reference datum. Copyright SaLIS Numéro de notice : A2010-160 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article DOI : sans Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=83713
in SaLIS Surveying and land information science > vol 70 n° 1 (Spring 2010) . - pp 39 - 48[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 121-2010011 RAB Revue Centre de documentation En réserve L003 Disponible FME 2010 : Taking spatial ETL [Extract-Transform-Load] technology to new heights / F. Artes in Geoinformatics, vol 13 n° 2 (01/03/2010)
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Titre : FME 2010 : Taking spatial ETL [Extract-Transform-Load] technology to new heights Type de document : Article/Communication Auteurs : F. Artes, Auteur ; F. Fischer, Auteur ; et al., Auteur Année de publication : 2010 Article en page(s) : pp 18 - 19 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géomatique
[Termes IGN] accès aux données localisées
[Termes IGN] données multisources
[Termes IGN] intégration de données
[Termes IGN] outil d'alimentation
[Termes IGN] partage de données localisées
[Termes IGN] projection
[Termes IGN] transformation de coordonnées
[Termes IGN] visualisation 3DRésumé : (Auteur) With the release of FME 2010 in January, Safe Software is emphasizing its stated commitment to improve spatial data access for organizations across the globe. In fact, the technology has been enhanced in ways that make spatial data more accessible - and potentially more useful -than ever before. According to Safe, usability enhancements in FME 2010 bring greater productivity for existing users, speed the learning curve for people that are new to the product, and enable faster adoption, broader deployment and creative new applications of FME technology throughout an organization. Copyright GEOinformatics Numéro de notice : A2010-074 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article DOI : sans Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=30270
in Geoinformatics > vol 13 n° 2 (01/03/2010) . - pp 18 - 19[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 262-2010021 RAB Revue Centre de documentation En réserve L003 Disponible A mathematical expression for stereoscopic depth perception / H. Rosas in Photogrammetric Engineering & Remote Sensing, PERS, vol 76 n° 3 (March 2010)
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Titre : A mathematical expression for stereoscopic depth perception Type de document : Article/Communication Auteurs : H. Rosas, Auteur ; W. Vargas, Auteur ; A. Ceron, Auteur ; et al., Auteur Année de publication : 2010 Article en page(s) : pp 301 - 306 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Photogrammétrie numérique
[Termes IGN] exagération de forme
[Termes IGN] géométrie projective
[Termes IGN] modèle stéréoscopique
[Termes IGN] perception
[Termes IGN] profondeurRésumé : (Auteur) The metric nature of stereoscopic depth perception has remained an enigma. Several mathematical formulations proposed for measuring the stereoscopic effect have not shown to be reliable. This may be due to the lack of a conceptual distinction between the 3D model geometrically obtained by intersection of visual rays (geometric model), and the 3D model perceived in the observer's mind (perceptual model). Based on the assumption that retinal parallax is the only source of information on depth available to the brain, we developed an equation that shows real and perceptual space to be connected by a logarithmic function. This relationship has allowed us to formulate the vertical exaggeration for all sorts of stereoscopic conditions, including natural stereovision. The obtained formulations might involve possibilities of technological applications, such as the artificial recreation of a natural stereovision effect, ant the design of stereoscopic instruments with a desired degree of vertical exaggeration. Copyright ASPRS Numéro de notice : A2010-089 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article DOI : 10.14358/PERS.76.3.301 En ligne : https://doi.org/10.14358/PERS.76.3.301 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=30285
in Photogrammetric Engineering & Remote Sensing, PERS > vol 76 n° 3 (March 2010) . - pp 301 - 306[article]Ready to navigate: a methodology for the estimation of the time-to-first-fix / M. Anghileri in Inside GNSS, vol 5 n° 2 (March - April 2010)
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Titre : Ready to navigate: a methodology for the estimation of the time-to-first-fix Type de document : Article/Communication Auteurs : M. Anghileri, Auteur ; M. Paonni, Auteur ; S. Wallner, Auteur ; et al., Auteur Année de publication : 2010 Article en page(s) : 10 p. ; pp 47 - 56 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Navigation et positionnement
[Termes IGN] analyse comparative
[Termes IGN] Matlab
[Termes IGN] rapport signal sur bruit
[Termes IGN] récepteur GNSS
[Termes IGN] signal GNSSRésumé : (Auteur) Estimating and comparing the various GNSS signals’ time-to-first-fix is an excellent tool for evaluating the design trades made on GNSS signal structures and a particularly important feature for general users in the mass market. This column describes the various factors that contribute to delays in a receiver’s initial position fix and proposes a methodology for estimating time-to-first-fix for various signals and receiver start conditions. Copyright Gibbons Media & Research LLC Numéro de notice : A2010-618 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article DOI : sans Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=33550
in Inside GNSS > vol 5 n° 2 (March - April 2010) . - 10 p. ; pp 47 - 56[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 159-2010021 SL Revue Centre de documentation Revues en salle Disponible Documents numériques
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Ready to navigate ... - pdf éditeurAdobe Acrobat PDF Wide-area RTK: high precision positioning on a continental scale / Manuel Hernández-Pajares in Inside GNSS, vol 5 n° 2 (March - April 2010)PermalinkAn intercomparison of simulated rainfall and evapotranspiration associated with a mesoscale convective system over West Africa / Françoise Guichard in Weather and Forecasting, vol 25 n° 1 (February 2010)PermalinkGoing 3D: personal Nav and LBS / R. Chen in GPS world, vol 21 n° 2 (February 2010)PermalinkMulti-sensor, multi-network positioning / R. Chen in GPS world, vol 21 n° 2 (February 2010)PermalinkTerrasar-X SAR processing and products / H. Breit in IEEE Transactions on geoscience and remote sensing, vol 48 n° 2 (February 2010)PermalinkAbsolute seafloor vertical positioning using combined pressure gauge and kinematic GPS data / Valérie Ballu in Journal of geodesy, vol 84 n° 1 (January 2010)PermalinkAcoustics & GPS: real-time scoring and classification of munitions / M. Cardoza in Inside GNSS, vol 5 n° 1 (January - February 2010)PermalinkPermalinkFundamental gravity network of the Republic Croatia in the function of control and improving of national and European geoid model / I. Grgic (01/01/2010)PermalinkLes institutions de la France / E. Arkwright (2010)Permalink