{
  "dataset": "canvas-proportions",
  "title": "The measured dimensions of catalogued paintings",
  "required_attribution": "Dimensions from the open catalogues of the Art Institute of Chicago, The Metropolitan Museum of Art and the National Gallery of Art, Washington, and from Wikidata, all released CC0. The parse that decides which printed numbers are the picture surface is by the Artificial Wasteland.",
  "composition_warning": "The four catalogues are counted separately and must never be pooled. Wikidata contributes 704,119 of 720,147 rows (97.8 per cent); the three museums together contribute 16,028. A statistic computed over the whole file is a statistic about Wikidata.",
  "sources": [
    {
      "id": "src:aw-dimension-parse",
      "title": "The dimension parse, the ratio, and the merged record set",
      "publisher": "Artificial Wasteland",
      "url": "https://artwaste.land/tools/canvas-ratio/",
      "accessed": "2026-08-01",
      "licence_id": "CC0-1.0",
      "licence": "CC0 1.0 Universal",
      "licence_basis": "publisher-statement",
      "licence_note": "The parse and the merged record set are ours and released CC0. The dimension NUMBERS inside it come from the four catalogues named below, every one of which is itself CC0, so no row in this file carries a more restrictive term than CC0. That is why one composite source covers the redistributed fields: the claim is true of every row, not of the file on average.",
      "role": "Every field. The numeric values within the redistributed fields originate in the four catalogues below."
    },
    {
      "id": "src:aic",
      "title": "Art Institute of Chicago public API",
      "publisher": "Art Institute of Chicago",
      "url": "https://api.artic.edu/api/v1/artworks",
      "accessed": "2026-08-01",
      "licence_id": "CC0-1.0",
      "licence": "CC0 1.0 Universal (all fields except `description`, which we do not use)",
      "licence_basis": "publisher-statement",
      "licence_note": "The API states its own terms in every response. Re-read 2026-09-04 at https://api.artic.edu/api/v1/artworks?limit=1, which returns: \"The `description` field in this response is licensed under a Creative Commons Attribution 4.0 Generic License (CC-By) and the Terms and Conditions of artic.edu. All other data in this response is licensed under a Creative Commons Zero (CC0) 1.0 designation and the Terms and Conditions of artic.edu.\" This dataset uses dimensions and dates, never `description`.",
      "rows": 3526,
      "role": "Rows where catalogue = aic."
    },
    {
      "id": "src:met",
      "title": "The Metropolitan Museum of Art Open Access (MetObjects.csv)",
      "publisher": "The Metropolitan Museum of Art",
      "url": "https://github.com/metmuseum/openaccess",
      "accessed": "2026-08-01",
      "licence_id": "CC0-1.0",
      "licence": "CC0 1.0 Universal",
      "licence_basis": "licence-file",
      "licence_note": "The repository's LICENSE file was fetched 2026-09-04 from https://raw.githubusercontent.com/metmuseum/openaccess/master/LICENSE and is the CC0 1.0 Universal legal text. A copy is committed at research/data-room/licences/MET-OPENACCESS-LICENSE.txt.",
      "rows": 8324,
      "role": "Rows where catalogue = met."
    },
    {
      "id": "src:nga-art",
      "title": "National Gallery of Art Open Data Program (objects.csv)",
      "publisher": "National Gallery of Art, Washington",
      "url": "https://github.com/NationalGalleryOfArt/opendata",
      "accessed": "2026-08-01",
      "licence_id": "CC0-1.0",
      "licence": "CC0 1.0 Universal",
      "licence_basis": "licence-file",
      "licence_note": "The repository's LICENSE file was fetched 2026-09-04 from https://raw.githubusercontent.com/NationalGalleryOfArt/opendata/main/LICENSE and is the CC0 1.0 Universal legal text. A copy is committed at research/data-room/licences/NGA-OPENDATA-LICENSE.txt.",
      "rows": 4178,
      "role": "Rows where catalogue = nga."
    },
    {
      "id": "src:wikidata",
      "title": "Wikidata Query Service (P31=Q3305213 with P2048 and P2049)",
      "publisher": "Wikimedia Foundation and the Wikidata contributors",
      "url": "https://query.wikidata.org/sparql",
      "accessed": "2026-08-01",
      "licence_id": "CC0-1.0",
      "licence": "CC0 1.0 Universal",
      "licence_basis": "publisher-statement",
      "licence_note": "Wikidata:Licensing, read 2026-09-04 at https://www.wikidata.org/wiki/Wikidata:Licensing: \"All structured data in the main, property and lexeme namespaces is made available under the Creative Commons CC0 License (Public domain).\" The dimensions used here are main-namespace structured data.",
      "rows": 704119,
      "role": "Rows where catalogue = wd, 97.8 per cent of the file. Crowd-sourced, not a museum."
    }
  ]
}