Data Sources Attribution

Last updated: 15 April 2026

This document lists all external data sources used in the Velobooker European Mountain Pass Database and the required attribution for each.

OpenStreetMap (OSM)

License: ODbL 1.0 (Open Database License)
Data used: Mountain pass nodes, way geometry, surface classification, geographic coordinates
Required attribution: "Contains information from OpenStreetMap, made available under the Open Database License"
License URL: https://opendatacommons.org/licenses/odbl/1.0/
Display location: App footer / About screen (always visible), API X-Attribution header

License: CC0 (Public Domain Dedication)
Data used: Pass descriptions, country, mountain range, image references, English labels
Recommended attribution: "Enriched with data from Wikidata"
License URL: https://creativecommons.org/publicdomain/zero/1.0/
Display location: App footer / About screen (always visible)

License: CC BY-SA 3.0 (Attribution-ShareAlike)
Data used: First paragraph of pass descriptions (extracted via Wikipedia API)
Required attribution: "Descriptions sourced from Wikipedia under CC BY-SA 3.0"
License URL: https://creativecommons.org/licenses/by-sa/3.0/
Display location: Pass detail view (when showing Wikipedia-sourced descriptions), Legal page

License: Per-image license (varies — CC BY-SA, CC BY, Public Domain, etc.)
Data used: Pass images referenced from Wikidata claims (P18)
Required attribution: Must store and display author name + specific license per image
License URL: Varies per image (check individual file pages on Commons)
Display location: Pass detail view (image attribution line when showing Commons photos)

License: Open data (SRTM/elevation dataset)
Data used: Elevation values for passes missing OSM ele tag
Attribution: Not required but recommended: "Elevation data from Open-Elevation"
Display location: Not required

Location	Sources	Format
App footer / About screen	OSM + Wikidata	Text line, always visible
Pass detail view	Wikipedia + Wikimedia Commons	Description attribution line, image credit
API responses	OSM	`X-Attribution` response header on pass endpoints
Legal page	All	Full text with license links

All pass-related API endpoints (GET /passes/*) include the following response header:

X-Attribution: Contains information from OpenStreetMap, made available under the Open Database License