{
  "checkedOn": "2026-10-16",
  "application": "Rhino 8 for macOS",
  "version": "8.35.26251.13002 (2026-09-08)",
  "method": "Native application UI; each DXF imported into a separate demo document, saved as 3DM, closed, reopened from Recent Files, then selected and measured again. Existing user drawings were not edited.",
  "libertyIsland": {
    "input": "/resources/liberty-island-context-2026-10-16/source-pack.zip",
    "dxfSha256": "c788cca439e09fab8c67ae383fa2afa913ed720b32b87f586c7a2ed727af96c2",
    "documentUnits": "metres",
    "importReport": {
      "modelSpaceObjectsRead": 119,
      "skipped": 0
    },
    "reopenedCurves": 119,
    "layers": [
      {
        "name": "BUILDINGS",
        "curves": 19,
        "measuredLengthMetres": 1677.091,
        "independentLengthMetres": 1677.0909204222
      },
      {
        "name": "ROADS",
        "curves": 100,
        "measuredLengthMetres": 2767.636,
        "independentLengthMetres": 2767.6361901311293
      }
    ],
    "comparison": "Cumulative lengths agree to the displayed 0.001 metre precision; this is not positional accuracy.",
    "editing": "Selection verified for both layers. No edit-and-restore acceptance claim for this source file.",
    "screenshot": "/resources/liberty-island-context-2026-10-16/rhino-reopened-check.jpg"
  },
  "syntheticSample": {
    "input": "/resources/atlasly-context-synthetic-sample.dxf",
    "dxfSha256": "bc71ef3a8c5889948464fe8d27f318c4fbcfa10ad95ae5816144fc900281a103",
    "purpose": "Invented compatibility geometry; not real terrain, survey, flood or planning evidence.",
    "units": "Imported metre DXF into a millimetre document, then changed document units to metres while maintaining object sizes.",
    "importReport": {
      "modelSpaceObjectsRead": 49,
      "skipped": 0
    },
    "sourceEntityCounts": {
      "3DFACE": 4,
      "LWPOLYLINE": 27,
      "POINT": 1,
      "MTEXT": 21
    },
    "reopenedNativeObjectCounts": {
      "curves": 27,
      "point": 1,
      "mesh": 1,
      "texts": 21
    },
    "conversionNote": "Native types/counts differ from source entities: four source 3DFACEs are represented by one mesh. The import report count is recorded separately from the 50 selectable native objects.",
    "road": {
      "layer": "A-ROAD-PRIMARY",
      "lengthMetres": 100
    },
    "contour": {
      "layer": "C-TOPO-MAJOR",
      "verticesMetres": [
        [
          -60,
          40,
          25
        ],
        [
          0,
          50,
          25
        ],
        [
          60,
          40,
          25
        ]
      ],
      "editing": "Moved one metre east, read the changed coordinates, moved one metre west and confirmed original coordinates; original coordinates remained after save, close and reopen."
    }
  },
  "notEstablished": [
    "AutoCAD or Civil 3D acceptance",
    "Surveyed alignment or measured positional accuracy",
    "Source completeness or freshness",
    "Real terrain, building heights or planning evidence",
    "Compatibility with every Rhino version or export route"
  ],
  "sourceAttribution": "Liberty Island context: © OpenStreetMap contributors, ODbL-1.0. Preserve the original source manifest, coordinate origin and terms."
}