# Map data attribution

The vector tile pyramid, `contour-city.geojson`, `address-registry.json`, and
`game-buildings.geojson` are derived from OpenStreetMap data.

- Source: OpenStreetMap contributors
- Source URL: https://www.openstreetmap.org/copyright
- Extract provider: Overpass API (https://overpass-api.de/)
- License: Open Data Commons Open Database License 1.0 (ODbL)
- License URL: https://opendatacommons.org/licenses/odbl/1-0/
- Coverage: the full playable city and a surrounding rural/suburban margin.
- Changes: source labels and POIs removed; street names replaced consistently;
  game addresses assigned to real addressed buildings; geometry simplified for delivery.

The adapted database is distributed at `/map/contour-city.geojson` under ODbL 1.0.