Tamara Ilieva. ANALYSIS AND GIS-BASED MODELING OF FREE AND OPEN DATA FOR TRACKING THE DYNAMICS OF THE URBAN ENVIRONMENT: CASE STUDY FOR SOFIA, BULGARIA. SGEM International Multidisciplinary Scientific GeoConference- EXPO Proceedings; 22nd SGEM International Multidisciplinary Scientific GeoConference Proceedings 2022, Informatics, Geoinformatics and Remote Sensing, 2022, pp. 107-114. https://doi.org/10.5593/sgem2022/2.1/s08.13