Credits

What the game is built with

Last updated 20 October 2026

Map data

Map data © OpenStreetMap contributors, available under the Open Database Licence (ODbL 1.0). Every track in the game with a mapped line starts from its OpenStreetMap centreline (for the lost tracks, the mapped remains or the paths that follow them), and the buildings, roads, forests, lifts and car parks around every track come from OpenStreetMap too. The track shapes in the Tracks section are drawn from the same OpenStreetMap centrelines.

The Yanqing track has no centreline in OpenStreetMap either: its line is our own design, drawn inside the venue's OpenStreetMap outline. The Hammarstrand and Meransen lines are our own designs too, placed at the venues on EU-DEM terrain, and so are the lines of the lost tracks with no surviving map: Igls 1964, Sapporo, Villard-de-Lans, Chamonix and Alpe d'Huez, each placed at its documented site, and Nagano, drawn inside the venue's OpenStreetMap outline. So are the lines of most other lost tracks, each a designed model at the place its records give. The Cervinia track has no centreline in OpenStreetMap. Its line is our own model, traced from the 1974 Lago Blu course map (Wikimedia Commons, public domain) and fitted to the real slope.

Terrain

Produced using Copernicus data and information funded by the European Union: EU-DEM layers, © European Union, Copernicus Land Monitoring Service. The ground around the European tracks, and the heights along all of them except Cervinia, come from EU-DEM, fetched through Open Topo Data.

The heights along the Cervinia track come from the DTM 2005/2008 (2 m) of the Regione autonoma Valle d'Aosta, licensed under CC BY 4.0. We sampled it along our model line and smoothed the slope; the result is not a survey of the old track.

The ground around the tracks in the United States and the heights along them come from the U.S. Geological Survey's 3D Elevation Program (3DEP, 10 m). For every other track outside EU-DEM's coverage (in Canada, Asia and Ukraine) the ground and the heights come from SRTM (30 m), courtesy of NASA and the U.S. Geological Survey. Both are fetched through Open Topo Data.

Software

The game runs on Babylon.js, licensed under the Apache License 2.0, and uses the studio environment map from its asset library to light the athletes.

Athletes

The athletes are built from Blender Studio's human base meshes, released under CC0. Thank you.

Podcast

Sound used in the podcast is credited on the podcast credits page.