{
  "title": "Metropolis",
  "era": "Two-mast schooner interpretation, before 1886",
  "version": "1.1",
  "modelStatus": "Interpretive reconstruction; no original lines plan recovered",
  "detailLevel": "full",
  "units": "metres",
  "axes": {
    "up": "+Y",
    "bow": "-X",
    "starboard": "+Z"
  },
  "historicalDimensions": {
    "lengthFeet": 126,
    "beamFeet": 28,
    "depthOfHoldFeet": 11,
    "beamInferred": false,
    "holdDepthUnknown": false,
    "dimensionsSourceQuality": "Selected documentary baseline; see vessel research notes for length and beam conflicts"
  },
  "geometryReference": {
    "hullBowX": -19.2024,
    "hullSternX": 19.2024,
    "deckY": 3.85,
    "waterlineY": 2.75,
    "waterlineIsInferred": true
  },
  "bounds": {
    "min": [
      -24.214935054565704,
      0.0050000000000000044,
      -4.3522
    ],
    "max": [
      19.412784672631663,
      27.253636653768638,
      4.3522
    ]
  },
  "triangleCount": 56594,
  "trianglesByGroup": {
    "hull": 12950,
    "bulwarks": 9298,
    "fittings": 2820,
    "deck": 7054,
    "steering": 424,
    "anchors": 636,
    "deckhouses": 84,
    "cabin_roofs": 40,
    "windows": 228,
    "skylights": 56,
    "spars": 5656,
    "standing_rigging": 2316,
    "sails": 11320,
    "running_rigging": 1536,
    "cargo_hatches": 120,
    "hatch_covers": 240,
    "ship_boat": 1816
  },
  "drawCalls": 51,
  "mastCount": 2,
  "supportsSails": true,
  "visibilityNodes": {
    "sails": "sails"
  },
  "deployedSailCount": 4,
  "inferredFeatures": [
    "Underwater hull lines and draft",
    "Exact colors, fittings, hatch layout and rigging routes",
    "Absolute spar heights and sail shapes"
  ],
  "configurationCaveat": "The survey and vessel records establish dimensions, schooner rig and surviving stern structure. Above-deck form is inferred with A.J. Rogers as a close regional and period comparison. Exact cabin, spars and sails are unknown. This one original vessel serves both the Deep and Shallow wreck markers.",
  "sources": [
    {
      "title": "NMC archaeological survey of Metropolis, 2009",
      "url": "https://nasnmc.com/images/naspics/PDFs/metropolis.pdf"
    },
    {
      "title": "Historical record compilation",
      "url": "https://greatlakesrex.wordpress.com/m/"
    },
    {
      "title": "Period comparison: A.J. Rogers historical view",
      "url": "https://www2.dnr.state.mi.us/Publications/PDFS/Fishing/Shipwrecks/GrandTraverseUnderwaterPreserve/AJAlidaJaneRogers.jpg"
    }
  ],
  "revisedDate": "2026-09-08",
  "revisionNote": "Added sourced documentary features and repaired metadata and research-note formatting; this collection cleanup is not a new full historical or geometry audit.",
  "documentedFeatures": [
    "The survey identifies the 1857 wooden schooner built by Peck and Masters at Cleveland, 126×28×11 ft. [NMC archaeological survey of Metropolis, 2009](https://nasnmc.com/images/naspics/PDFs/metropolis.pdf)",
    "A mast step and keel structure survive; the deep and shallow sites are parts of one vessel. [NMC archaeological survey of Metropolis, 2009](https://nasnmc.com/images/naspics/PDFs/metropolis.pdf)"
  ]
}