{
  "schema": "midget-manifold-face-survey-v1",
  "units": "mm",
  "method": null,
  "basis": null,
  "joint": null,
  "surveyed_component": null,
  "component_identity_observation": null,
  "photo_refs": [],
  "frame": {
    "name": null,
    "origin_datum": null,
    "x_positive": null,
    "y_positive": null,
    "z_positive": null,
    "configuration": null,
    "right_handed_orthonormal": null
  },
  "survey": {
    "same_component_face_and_configuration_confirmed": null,
    "joint_face_datum_note": null,
    "positive_normal_direction_note": null,
    "first_three_face_points_define_positive_normal_confirmed": null,
    "face_points": [
      {"name": "P1", "xyz_mm": [null, null, null], "datum_note": null},
      {"name": "P2", "xyz_mm": [null, null, null], "datum_note": null},
      {"name": "P3", "xyz_mm": [null, null, null], "datum_note": null},
      {"name": "P4 independent plane check", "xyz_mm": [null, null, null], "datum_note": null}
    ],
    "boundaries": [
      {
        "name": null,
        "role": null,
        "observation_note": null,
        "ordered_closed_joint_face_trace_confirmed": null,
        "points": [
          {"name": "opening-1/A", "xyz_mm": [null, null, null], "datum_note": null},
          {"name": "opening-1/B", "xyz_mm": [null, null, null], "datum_note": null},
          {"name": "opening-1/C", "xyz_mm": [null, null, null], "datum_note": null},
          {"name": "opening-1/D", "xyz_mm": [null, null, null], "datum_note": null}
        ],
        "independent_chord_distances": [
          {"from": "opening-1/A", "to": "opening-1/B", "distance_mm": null, "measurement_point_and_method_note": null},
          {"from": "opening-1/A", "to": "opening-1/D", "distance_mm": null, "measurement_point_and_method_note": null}
        ]
      }
    ]
  },
  "limits": "Blank direct spatial survey, not engine measurement-log input. Identify one actual component and joint face; record the other mating part separately. Copy a boundary record only for an observed gas opening, fixing hole or face outer edge. Change point counts/names and chord endpoints to match the actual trace; neither the sample count nor catalog port count supplies missing points. Do not close hidden outlines, infer circles/corners, or copy coordinates from photos/public CAD. Survey three ordered face points plus independent checks in an unchanged named physical frame. Independently measure at least two nonparallel sample-to-sample chords per trace. A bench survey does not preserve installed pose. Outputs retain raw sample coordinates as reference chords/check vertices, not exact curved outlines, material, fitted port registration, sealing, flow, access or a removal path. Tool comparison limits are not factory or fitted tolerances."
}