Positional Accuracy Assessment of the VGI Data from OpenStreetMap - Case Study: Federal University of Bahia Campus in Brazil Topics: Big Data and GIS; Cartography and Geodesy; Geodesy; GPS and Location Detection; Spatial Information and Society; Spatial Modeling and Reasoning; Standardization and Interoperability; Topological Modeling and Analysis; Urban and Regional Planning ; Urban Remote Sensing; Web Applications In Proceedings of the 4th International Conference on Geographical Information Systems Theory, Applications and Management GISTAM - Volume 1, 231-238, 2018 , Funchal, Madeira, Portugal