Occupancy Grid Map Generation from OSM Indoor Data for Indoor Positioning Applications Topics: Cartography and Geodesy; Geographic Information Retrieval; Geospatial Information and Technologies; GPS and Location Detection; Industrial Applications; Intelligent Data Fusion; Spatial Analysis and Integration; Transportation Engineering; Urban and Regional Planning In Proceedings of the 6th International Conference on Geographical Information Systems Theory, Applications and Management GISTAM - Volume 1, 168-174, 2020