transitio
Copyright (c) 2026 Henrikki Tenkanen

This software is licensed under the MIT License; see LICENSE for the terms.

The feed index that transitio installs with transitio.index.refresh() is
derived data compiled from several open sources; release wheels ship without
an index. Every built index also carries its own NOTICE file,
generated when it is built, recording the exact versions and licences of the
sources that index was built from; that per-snapshot NOTICE travels with the
index and is authoritative for a given snapshot. The upstream sources are:

  - Transitland Atlas (Interline) -- feed identities, URLs and licences.
    Licensed CC-BY 4.0; attribution required.
    https://github.com/transitland/transitland-atlas
  - Mobility Database catalog (MobilityData) -- feed identities and metadata.
    https://mobilitydatabase.org/
  - GBFS systems.csv (MobilityData) -- shared-mobility system identities,
    read by the build to keep them apart from the transit feeds; the index
    does not list them. https://github.com/MobilityData/gbfs
  - Overture Maps divisions -- administrative boundary geometry, provided
    under CDLA-Permissive-2.0 (https://cdla.dev/permissive-2-0/), derived
    from OpenStreetMap (c) OpenStreetMap contributors under the Open Database
    License (ODbL 1.0), whose share-alike and attribution terms apply to the
    geometry derived from it; geoBoundaries (CC BY 4.0); and Esri Community
    Maps and Maps Entity Variant Names (CC0 1.0).
    https://overturemaps.org/  https://www.openstreetmap.org/copyright
  - Wikidata -- place identifiers and names, dedicated to the public domain
    under CC0. https://www.wikidata.org/

Metro memberships were derived at build time from these sources; the index
ships no boundary data of theirs:

  - GHS Urban Centre Database 2025 (GHS-UCDB R2024A), European Commission,
    Joint Research Centre, doi:10.2905/1a338be6-7eaf-480c-9664-3a8ade88cbcd
    -- CC BY 4.0 (Commission Decision 2011/833/EU).
  - Girgin, Cattaneo, de By, McMenomy, Nelson and Vaz (2024), Worldwide
    Delineation of Multi-Tier City-Regions (Zenodo) -- the FAO city-regions,
    CC BY 4.0. https://doi.org/10.5281/zenodo.11187634
  - Eurostat, Urban Audit functional urban areas (2024) and Eurostat,
    metropolitan regions (NUTS 2021) -- Eurostat copyright notice
    (https://ec.europa.eu/eurostat/help/copyright-notice). The administrative
    boundaries are (c) EuroGeographics, under the Eurostat/GISCO conditions of
    use, which restrict them to non-commercial use.
    https://ec.europa.eu/eurostat/web/gisco/geodata/statistical-units
  - Overture Maps divisions, as above.

A feed's coverage geometry is withheld only where the feed's licence explicitly
disallows redistribution. A feed whose licence is unknown keeps its coverage
geometry, and the index's `redistribution_allowed` column records the status
(true, false or unresolved) the build judged for each feed. The per-snapshot
NOTICE records the licence judged for each feed.
