{
  "title": "A.J. Rogers",
  "era": "Two-mast merchant-schooner career",
  "version": "1.1",
  "modelStatus": "Interpretive reconstruction; no original lines plan recovered",
  "detailLevel": "full",
  "units": "metres",
  "axes": {
    "up": "+Y",
    "bow": "-X",
    "starboard": "+Z"
  },
  "historicalDimensions": {
    "lengthFeet": 137.5,
    "beamFeet": 26.1,
    "depthOfHoldFeet": 12.5,
    "beamInferred": false,
    "holdDepthUnknown": false,
    "dimensionsSourceQuality": "Selected documentary baseline; see vessel research notes for length and beam conflicts"
  },
  "geometryReference": {
    "hullBowX": -20.955000000000002,
    "hullSternX": 20.955000000000002,
    "deckY": 4.25,
    "waterlineY": 3.1,
    "waterlineIsInferred": true
  },
  "bounds": {
    "min": [
      -26.422990145496136,
      0.0050000000000000044,
      -4.062640000000001
    ],
    "max": [
      21.055000000000003,
      29.453127967687383,
      4.062640000000001
    ]
  },
  "triangleCount": 56728,
  "trianglesByGroup": {
    "hull": 12950,
    "bulwarks": 9346,
    "fittings": 2844,
    "deck": 6492,
    "steering": 424,
    "anchors": 636,
    "deckhouses": 84,
    "cabin_roofs": 40,
    "windows": 228,
    "skylights": 56,
    "spars": 6256,
    "standing_rigging": 2316,
    "sails": 11320,
    "running_rigging": 1536,
    "cargo_hatches": 120,
    "hatch_covers": 240,
    "centerboard_trunk": 24,
    "ship_boat": 1816
  },
  "drawCalls": 53,
  "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": "Vessel dimensions, two-mast rig and centerboard trunk are documented. The DNR historical image guides the schooner at the left of the scene; the foreground steamer is a different vessel. Unseen cabin, hatch layout, sail cut, colors and underwater lines are interpreted.",
  "sources": [
    {
      "title": "Alida J. Rogers wreck survey",
      "url": "https://3dshipwrecks.org/shipwreck-alida-j-rogers/"
    },
    {
      "title": "DNR historical photograph",
      "url": "https://www2.dnr.state.mi.us/Publications/PDFS/Fishing/Shipwrecks/GrandTraverseUnderwaterPreserve/AJAlidaJaneRogers.jpg"
    },
    {
      "title": "Preserve vessel history",
      "url": "https://www.michiganpreserves.org/grand-traverse-bay-underwater-preserve/"
    }
  ],
  "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 1862 wooden schooner US1552 at 137.5×26.1×12.5 ft. [Alida J. Rogers wreck survey](https://3dshipwrecks.org/shipwreck-alida-j-rogers/)",
    "A centerboard trunk survives. [Alida J. Rogers wreck survey](https://3dshipwrecks.org/shipwreck-alida-j-rogers/)"
  ]
}