vibecoded using OpenCode Zen
Data sources
Read-only git submodules used by `scripts/prepare_map.py`. Do not edit their
contents in this repository; update the upstream repo instead.
| Path | Source | License | Used for |
| --- | --- | --- | --- |
| `world-cities/` | Simplemaps World Cities database, Basic (~48k cities), via https://huggingface.co/datasets/cweichen/world-cities | CC BY 4.0 | City names, coordinates, population (→ supply limit), country, capital flag |
| `country-borders/` | https://github.com/geodatasource/country-borders | CC BY-SA 4.0 | Land-adjacency graph of countries (ISO 3166-1 alpha-2) |
| `natural-earth-geojson/` | https://github.com/martynafford/natural-earth-geojson (Natural Earth data converted to GeoJSON) | CC0 | `50m/physical/ne_50m_coastline.json` for coastal-distance computation (finer than 110m so estuary ports register) |
Attribution required for the CC BY-SA country-borders data:
"This site or product includes Country Borders data available from
https://www.geodatasource.com.