Data Sources
Livioo analyzes and aggregates data from multiple public sources. Below is the list of the main sources that power the six dimensions of the Livability Index.
OpenStreetMap (OSM)
Geospatial data for points of interest, buildings, infrastructure, green spaces, healthcare facilities, schools, and amenities. The primary source for most dimensions.
License: ODbL 1.0
GTFS — Sofia Urban Mobility Center
Official data on routes, stops, and schedules for public transit in Sofia (buses, trams, metro). Used for the Transit dimension.
License: Public data
Sensor.Community
Data from a citizen sensor network for air quality (PM2.5 and PM10). Used for the Air Quality dimension.
License: ODbL 1.0
NVO and DZI exam results
Publicly available results from national standardized exams (NVO) and state matriculation exams (DZI), used to assess school quality within a 5 km radius.
License: Public data
Sentinel-2 satellite data
Satellite imagery for calculating NDVI (green cover index) around each point. Used for the Green Space dimension.
License: Copernicus Open Access
Data is updated periodically. Last update: April 2026. For details on methodology, see the methodology page.