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 "createdAt": "2026-08-12T00:00:00Z",
 "description": "Append-only Evidence Passport records. Old revisions are immutable; corrections create a new revision and preserve the previous permalink.",
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  "id": "warsaw-open-data",
  "title": "Warsaw's Open Data API: Live Bus and Tram Positions Behind an API Key",
  "canonicalUrl": "https://1001smartcities.org/projects/warsaw-open-data/"
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 "currentRevisionId": "2026-10-17-baseline",
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   "createdAt": "2026-10-17T22:21:35Z",
   "effectiveAt": "2026-10-17",
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   "summary": "Created the first structured Evidence Passport with 17 claims and 8 source dossiers.",
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     "summary": "Added claim-level evidence mapping and source dossiers."
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     "operation": "add",
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     "status": "live",
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     "evidenceGrade": "official",
     "timeline": {
      "started": 2015,
      "ended": null
     }
    },
    "governance": {
     "operator": "Urząd m.st. Warszawy (Warsaw City Hall), Biuro Cyfryzacji; vehicle positions published by the City Hall, not by the transport authority ZTM",
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     "cost": null,
     "ownership": null,
     "decisionRights": null,
     "exitConditions": null
    },
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      "text": "Since 2015 Warsaw City Hall has run api.um.warszawa.pl, an open-data platform",
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      "supportNote": "All resources are available through an application programming interface prepared by the City Hall.",
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      "text": "the live positions of the city's buses and trams, refreshed every 15 seconds",
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      "text": "The city charges nothing for the data",
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      "supportNote": "The director of the City Hall's digitisation office: 'we charge no fees for it and do not ask who downloads it'.",
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      "text": "access needs a registration and a personal API key",
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      "text": "In 2022 the city counted several million automated requests a week to the vehicle positions",
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      "field": "snippet",
      "text": "from apps including Jak dojadę and Automapa",
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      "text": "The positions come from the City Hall, not from the transport authority ZTM",
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      "supportNote": "The developer who republishes the feed notes that vehicle locations are supplied by Warsaw City Hall rather than by ZTM.",
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      "text": "the GTFS timetable feed that route planners use is built by an independent developer from ZTM schedule data shared through a restricted endpoint",
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      "supportNote": "The WarsawGTFS README says static data comes from a proprietary ZTM endpoint whose access is restricted and needs credentials; the developer's page publishes the resulting warsaw.zip under ZTM's data usage terms.",
      "caveat": "That route planners use this feed rests on the developer's own publication and on the app makers who credit it; no ZTM statement on its own feeds was read.",
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      "field": "snippet",
      "text": "in his realtime feed some trip identifiers may not match that timetable",
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      "supportNote": "Because positions come from the City Hall, the developer warns that some trip_ids in the realtime feed may not match any trip in the static GTFS.",
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      "text": "The city says a new portal, dane.um.warszawa.pl, will fully replace the old platform",
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      "field": "lesson",
      "text": "The national catalogue labels the city's transit datasets CC BY 4.0",
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      "supportNote": "Both records filed by Warsaw City Hall, for tram positions and for public-transport timetables, carry the licence name 'CC BY 4.0'.",
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       "note": "The passport copies the published claim and its recorded source mapping without adding a conclusion."
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     },
     {
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      "field": "lesson",
      "text": "gives 'Other (Public Domain)' as the licence description in the same record",
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     },
     {
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      "field": "lesson",
      "text": "points to the city's own terms of use",
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      "text": "the city told a European programme it shares data without legal restrictions",
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      "text": "a 2018 university thesis",
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      "supportNote": "The 2018 Warsaw University of Technology thesis states that reusers must give the date of creation and the source, i.e. Miasto Stołeczne Warszawa.",
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      "text": "the developer of the Warsaw GTFS feeds, read the terms as requiring credit to Miasto Stołeczne Warszawa with a date",
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      "title": "Toportal — Warszawa. Dane po warszawsku (republished city press release, 22 Jun 2022)",
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       "value": "Regional daily reproducing a City Hall release (credited '/ um.warszawa.pl /'): the City Hall created the api platform in 2015; data served through an API; bus and tram positions updated every 15 seconds; several million automated requests a week to the vehicle-position resource, used by apps including Jak dojadę, Czy na czas, Gdzie ten tramwaj, Real bus and Automapa; Tadeusz Osowski, director of the City Hall's Biuro Cyfryzacji: the city charges no fees and does not ask who downloads the data.",
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      "title": "dane.gov.pl — catalogue record 'Lokalizacja pojazdów Tramwajów Warszawskich' (Urząd m.st. Warszawy)",
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       "value": "National open-data catalogue record filed by Warsaw City Hall for the tram-position dataset (record created 31 Aug 2016, modified 19 Mar 2024): licence name 'CC BY 4.0', licence description 'Other (Public Domain)'; access requires registration at api.um.warszawa.pl; terms of use are given on api.um.warszawa.pl.",
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      "title": "dane.gov.pl — catalogue record 'Rozkład jazdy komunikacji publicznej' (Urząd m.st. Warszawy)",
      "url": "https://api.dane.gov.pl/1.4/datasets/49",
      "publisher": {
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       "classification": "not-classified"
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     {
      "id": "src-099eca9abd25d24b",
      "title": "Interreg Europe — Good practice: Open data in the Warsaw way (20 Aug 2024)",
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      "publisher": {
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       "type": "descriptive-source-note",
       "value": "Good-practice entry owned by the City of Warsaw (PROACTsme project): architecture principles include 'making available without legal restrictions'; the city cites nearly 2 million daily requests to the platform and over 6,000 registered users as evidence of success.",
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     },
     {
      "id": "src-049cde5bbc346b76",
      "title": "Warsaw University of Technology — Bondarzewska, bachelor's thesis on tram-delay notifications (2018)",
      "url": "https://www.ia.pw.edu.pl/~mkamola/Bondarzewska18.pdf",
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       "type": "descriptive-source-note",
       "value": "Bachelor's thesis (supervisor Mariusz Kamola) building a tram-delay alert service on the city's tram-position API: reusers must state the date of creation and the source, Miasto Stołeczne Warszawa; some datasets need an API key obtained by creating an account.",
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      "title": "mkuran.pl — GTFS feeds: Warszawski Transport Publiczny (ZTM Warszawa)",
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      "locator": {
       "type": "descriptive-source-note",
       "value": "Independent developer's feed page: the Warsaw GTFS is licensed under ZTM Warszawa's data usage terms (ODbL for bus shapes); the realtime vehicle-position feed falls under the Warsaw Open Data Project usage terms, which require crediting 'Miasto Stołeczne Warszawa', the data download date and a link; vehicle locations come from the City Hall, not ZTM, so some trip_ids may not match the static GTFS.",
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     "Publisher names and source languages have not yet been classified; domains are recorded without guessing.",
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 ]
}