{
  "id": "brown-1845",
  "title": "Chart of Part of the Arctic Regions as known in 1845",
  "publication": "John Brown, The North-West Passage, and the Plans for the Search for Sir John Franklin: A Review. London: E. Stanford, 1858.",
  "historical_knowledge_year": 1845,
  "publication_year": 1858,
  "scan_size_px": [3733, 2344],
  "source_sha256": "8afcd50516c7c0551c1beeaa11c323a4ee8a00e1a48d97bb13b5b6f2f60e6711",
  "historical_work_rights": "Public domain (1858)",
  "scan_provenance": "Hand-coloured copy with British Museum stamp dated 1860. Scan provider and reproduction terms still being documented; no commercial-use clearance represented.",
  "digitization_status": "Work in progress; regional vector preview only. Not a released research dataset.",
  "preview_region": "King William Land",
  "preview_bounds_scan_px": [1220, 1390, 1660, 1830],
  "coordinate_system": "Image pixels, x right, y down. Not geographic coordinates.",
  "method": "Geometry follows the historical scan, including its errors. Later annotations are distinguished from period knowledge.",
  "project": "Mapanaut / Historical Map Studio"
}