NOTICE.md

Third-party data & attributions

TREK bundles and uses third-party data that requires attribution.

geoBoundaries — country & sub-national boundaries

The Atlas map's administrative boundaries (admin-0 countries and admin-1 provinces/counties), shipped at server/assets/atlas/admin0.geojson.gz and server/assets/atlas/admin1.geojson.gz and generated by server/scripts/build-atlas-geo.mjs, are derived from geoBoundaries.

Runfola, D. et al. (2020) geoBoundaries: A global database of political administrative boundaries. PLoS ONE 15(4): e0231866. https://doi.org/10.1371/journal.pone.0231866

geoBoundaries is licensed under CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/). Source: https://www.geoboundaries.org/

The bundled files are simplified (coordinate-quantized) and re-tagged with the property names TREK consumes. Country borders (admin0) derive from the geoBoundaries CGAZ composite; sub-national regions (admin1) derive from the per-country open (gbOpen) release.

OpenStreetMap — geocoding

Atlas reverse-geocodes places via the Nominatim service. Geocoding data is © OpenStreetMap contributors, licensed under the Open Database License (ODbL). https://www.openstreetmap.org/copyright

OurAirports — airport reference data

server/assets/airports.json is built from OurAirports (https://ourairports.com/data/), released into the public domain.