Advocacy for external quality in GIS Geospatial semantics : international conference GeoS 2011 : proceedings /Pierkot, Christelle Zimanyi, E. Yuan Lin Libourel, T. SYSTEME D'INFORMATION GEOGRAPHIQUE BASE DE DONNEES QUALITE EVALUATION METHODOLOGIE INTERNET Springer Claramunt, C. (ed.) Levashkin, S. (ed.) Bertolotto, M. (ed.) 2011 text https://www.documentation.ird.fr/hor/fdi:010057437 fdi:010057437 Pierkot Christelle, Zimanyi E., Yuan Lin, Libourel T.. Advocacy for external quality in GIS. In : Claramunt C. (ed.), Levashkin S. (ed.), Bertolotto M. (ed.), . Geospatial semantics : international conference GeoS 2011 : proceedings Springer, ). 2011, 151-153 International Conference GEOS.Geospatial Semantics 2011, 4., Brest (FRA), 2011/05/12-13 EN