[usb-ci] Seminario Grupo BD Jueves 13/1/2011

ruckhaus ruckhaus en ldc.usb.ve
Mar Ene 11 11:34:54 VET 2011


 El Grupo de Bases de Datos de la Universidad Simón Bolívar, tiene el
 gusto de  invitarle a su próximo seminario el día jueves 13 de enero
 de 2011, a la 1:30 pm en el Laboratorio BWL

 Titulo: Quality Management in User Generated Spatial Content

 Presentacion: Ing. Carmen Brando  carmen.brando-escobar en ign.fr

 Tutor: Bénédicte Bucher <benedicte.bucher en ign.fr>
 At Cogit Laboratory - Institut Géographique National (IGN) – Saint 
 Mandé, France
 Associated with Ecole doctoral Mathématiques et STIC - Université 
 Paris-Est Marne-la-
 Vallée

 Resumen:
 In the last decade, the burst of the Web 2.0 has rapidly increased the 
 amount of user
 generated content (UGC) on the Internet. Most of Web 2.0 applications 
 allow users to
 interact with other users and edit website content. There has been a 
 growing interest for
 online communities where users contribute to the creation of spatial 
 content (SC). SC is any
 content with a spatial dimension. It may be created through annotating 
 given resources with
 coordinates, such as pictures in Flickr, Wikipedia entries or crime 
 activities in Ucrime, that is,
 geotagging. SC may also be directly created by editing geographical 
 features like in
 Openstreet Map (OSM), Wikimapia, and Google Map Maker. These projects 
 belong to a
 movement, which has been baptized by Michael Goodchild as Volunteered 
 Geographic
 Information (VGI) (Goodchild, 2007). Citizens are presented as 
 observers and have no
 specific expertise in geomatics. The term neogeographers has been 
 coined to describe them
 (Turner, 2006). Instead of VGI, we chose the term User Generated 
 Spatial Content (UGSC)
 to designate such content because it seems more generic, and it is in 
 related literature as
 well.
 
 The focus of my thesis is twofold: (i) specifications for UGSC for 
 quality management, an
 important notion both to improve quality during production, and to help 
 in providing quality
 metadata for users is that of specifications. They are the most 
 detailed available source of
 knowledge about geographic databases content. We have recently proposed 
 an approach
 grounded on the improvement of UGSC specifications, not only to improve 
 their structure but
 also to establish possible relationships with reference data. Defining 
 an adequate conceptual
 model of classes, attributes, integrity constraints and conventions for 
 geographical data (that
 will make up the content specifications) is not an easy task for 
 contributors. Therefore, our
 proposition aims at assisting them in this task. We have designed and 
 developed a generic
 process to automatically produce conceptual modeling elements such as 
 feature types,
 attribute types, and relationship types, including possible 
 relationship types with external
 reference data from a set of keywords. This process exploits 
 information from two different
 kinds of existing contents: user generated content (like Wikipedia) and 
 more conventional
 content (like WordNet and NMA databases). (ii) Reconciliation 
 mechanisms to improve
 collaborative editing of spatial content, similar to those used in Wiki 
 software (e.g.
 MediaWiki). These techniques are built upon an operational 
 transformation model (i.e.
 suppression, creation, modification) which aims to improve consistency 
 of UGSC. This
 aspect is on-going work and will be soon the subject of a Master’s 
 Thesis.
 
 REFERENCES
 Brando C, Bucher B (2010) Quality in User Generated Spatial Content: A 
 Matter of
 Specifications, in the 13th AGILE International Conference on 
 Geographic Information
 Science, Guimarães, Portugal
 Goodchild, M., 2007, Citizens as sensors: the world of volunteered 
 geography, GeoJournal
 69(4), 211—221
 Turner, A., 2006, Introduction to Neogeography, O'Reilly Media


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