# Poland regional map data

Source: geoBoundaries gbOpen, Poland ADM1, boundary ID `POL-ADM1-17162690`.
The source represents 2017 boundaries, built December 12, 2023; retrieved September 17, 2026.

- Metadata: https://www.geoboundaries.org/api/current/gbOpen/POL/ADM1/
- Exact source: https://media.githubusercontent.com/media/wmgeolab/geoBoundaries/9469f09/releaseData/gbOpen/POL/ADM1/geoBoundaries-POL-ADM1_simplified.geojson
- Underlying contributors: OpenStreetMap contributors, Wambacher; distributed through geoBoundaries.
- Dataset licence: Open Data Commons Open Database License 1.0 (ODbL).
- Attribution and terms: https://www.openstreetmap.org/copyright
- Licence: https://opendatacommons.org/licenses/odbl/1-0/

`poland-regions.geojson` is the unmodified source data. `poland-regions.json` is the derived database,
available under the same ODbL licence. It uses a local equirectangular projection, simplified to 0.6 SVG
units, rounded to one decimal place, with Polish labels and region identifiers. Regenerate it with
`node scripts/prepare-map.mjs`. The map is an overview of meeting regions, not a navigation map.
It is hosted with the site and makes no third-party map requests.