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Detection of potential updates of authoritative spatial databases by fusion of Volunteered Geographical Information from different sources / Stefan Ivanovic (2015)
Titre : Detection of potential updates of authoritative spatial databases by fusion of Volunteered Geographical Information from different sources Type de document : Article/Communication Auteurs : Stefan Ivanovic (1988 - 2020) , Auteur ; Ana-Maria Olteanu-Raimond , Auteur ; Sébastien Mustière , Auteur ; Thomas Devogele , Auteur Editeur : Milan : Politechnico di Milano Année de publication : 2015 Collection : Geomatics workbooks (Laboratorio di geomatica), ISSN 1591-092X num. 12 Conférence : FOSS4G 2015 Europe conference, Free and open-source software for geospatial 15/07/2015 17/07/2015 Como Italie open access abstracts Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Bases de données localisées
[Termes IGN] analyse comparative
[Termes IGN] appariement automatique
[Termes IGN] détection automatique
[Termes IGN] données localisées de référence
[Termes IGN] données localisées des bénévoles
[Termes IGN] Géoxygène (plateforme de généralisation)
[Termes IGN] mise à jour de base de données
[Termes IGN] PostgreSQL
[Termes IGN] précision de localisation
[Termes IGN] qualité des données
[Termes IGN] sport
[Termes IGN] trace GPSRésumé : (auteur) Nowadays, needs for very up to date referential spatial data increase significantly. Thus, a continuous update of authoritative spatial databases becomes highly demanding task in both aspects, technical and financial. In the same time, alternative sources of spatial data, such as Volunteered Geographical Information – VGI (Goodchild, 2007) seems to be suitable solution. This data is easy available and is being collected in almost every moment somewhere in the world. The main objective of our research is proposing a method for identifying potential updates in authoritative spatial databases using VGI data, more precisely GPS tracks. We identified walkway and tractor as very challenging types of roads for continuous update due to their intermittent nature (e.g. they appear and disappear very often) and various landscape (e.g. forest, high mountains, seashore, etc.). Even though, these types of roads are not of the highest priority for a national mapping agency, they are still very important for production of touristic maps and for other different applications such as defense, sport activities, etc. That is why we have focused on GPS traces obtained in sport activities. To detect potential update, links between similar features need to be defined. This step consists in applying a data matching algorithm in order to match VGI and authoritative data. Then, the question of VGI tracks quality arises. Furthermore, VGI traces are collected without any specified procedures, less or inexistent metadata, usually by low class GPS devices. Hence, heterogeneity of data is very high as well as spatial inaccuracy. In this work we focus on examination of data quality, especially on its spatial and temporal aspects. First, we present an overview of VGI data sources (websites) and the heterogeneities that characterize them. In terms of data, we can rely on spatiotemporal data (i.e. coordinates and sometimes elevation and timestamps) as well as on a variety of descriptive information in text format such as: type of activity, difficulty, trace description etc. Second, providing a comprehensive analysis of elements which affect GPS data quality is necessary. Sources of errors related to technical aspect of GPS data collection are partially important for our work. Since we use data obtained by low class GPS receivers, which positional accuracy is at meter level, we are not concerned about the sources that affect the accuracy at sub-meter level. Therefore, our attention is directed to identifying and classifying sources of errors according to which extent they affect positional accuracy of GPS tracks. Finally, we are interested in evaluation of data quality by analyzing VGI data itself, without comparing it to referential data. Thus, we tend to obtain the more statistical indicators of data quality that we can, such as indicators of: spatial dispersion, precision, reliability, correlation between data etc. As a result, a process of automatic collection of GPS traces from web-sites and storing them into PostgreSQL database was created. Evaluation of data quality is conducted by using an open source platform GeOxygene, developed by COGIT laboratory. Numéro de notice : C2015-040 Affiliation des auteurs : LASTIG COGIT+Ext (2012-2019) Thématique : GEOMATIQUE Nature : Communication nature-HAL : ComSansActesPubliés-Unpublished DOI : sans En ligne : http://geomatica.como.polimi.it/workbooks/n12/ Format de la ressource électronique : URL Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=83204 Documents numériques
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Detection of potential updates - résuméAdobe Acrobat PDF
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Titre : International geoid service bulletin : IGS bulletin Type de document : Périodique Auteurs : International Service for the Geoid (Italie), Auteur Editeur : Milan : Politechnico di Milano Année de publication : 1993 - 2002 Note générale : The ISG Bulletin was born in 1993 as a special publication on geoid computation (with the name IGeS Bulletin), to collect news and results on gravity and geoid, and, at the same time, to describe IGeS activities. Since IGeS Bulletin establishment, 13 issues have been published, once (or more) per year, from April 1993 to November 2002. In 2003 it merged into the Newton's Bulletin, together with BGI publications. Langues : Anglais (eng) Résumé : L'ensemble des bulletins de 1993 à 2002 est en accès libre sur le site de l'IGS Numéro de notice : 207 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Titre de périodique En ligne : http://www.isgeoid.polimi.it/Iges_bulletin/iges_bulletin.html Format de la ressource électronique : URL Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=265 Mare nostrum, Geomed report - 1 / R. Barzaghi (1992)
Titre : Mare nostrum, Geomed report - 1 Type de document : Monographie Auteurs : R. Barzaghi, Éditeur scientifique ; Maria Antonia Brovelli, Éditeur scientifique ; Fernando Sanso, Éditeur scientifique Editeur : Milan : Politechnico di Milano Année de publication : 1992 Importance : 100 p. Format : 21 x 30 cm Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie physique
[Termes IGN] champ de pesanteur terrestre
[Termes IGN] géoïde gravimétrique
[Termes IGN] géoïde local
[Termes IGN] Méditerranée, merIndex. décimale : 30.40 Géodésie physique Numéro de notice : 18368 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Recueil / ouvrage collectif Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=41493 Réservation
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Code-barres Cote Support Localisation Section Disponibilité 18368-01 30.40 Livre Centre de documentation Géodésie Disponible Mare nostrum, Geomed report - 3 [Papers from working meeting in Graz, 7 - 9 June 1993] / R. Barzaghi (1992)
Titre : Mare nostrum, Geomed report - 3 [Papers from working meeting in Graz, 7 - 9 June 1993] Type de document : Actes de congrès Auteurs : R. Barzaghi, Éditeur scientifique ; Maria Antonia Brovelli, Éditeur scientifique ; Fernando Sanso, Éditeur scientifique Editeur : Milan : Politechnico di Milano Année de publication : 1992 Collection : GEOMED Report num. 3 Conférence : Mare nostrum, Geomed, working meeting 07/06/1993 09/06/1993 Graz Autriche open access abstracts Importance : 190 p. Format : 21 x 30 cm Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie physique
[Termes IGN] altimétrie satellitaire par radar
[Termes IGN] données altimétriques
[Termes IGN] géoïde gravimétrique
[Termes IGN] gravimétrie en mer
[Termes IGN] Méditerranée, mer
[Termes IGN] niveau moyen des mers
[Termes IGN] surface de la merNuméro de notice : 18370 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Actes Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=34857 Réservation
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Code-barres Cote Support Localisation Section Disponibilité 18370-01 CG.93 Livre Centre de documentation Congrès Disponible