{
  "title": "Land survey control points and datum metadata for AI",
  "source_page": "https://fiund.com/industries/land-survey-control-datum-data",
  "authorship": "Original fictional Fiund editorial exercise. No actual operating records or third-party source assets are included.",
  "example": {
    "title": "A shared point name does not establish a shared coordinate basis",
    "context": "Abstract invented control tables use no real coordinates or boundary information. The exercise checks identity and metadata rather than performing a survey transformation.",
    "records": [
      [
        "LSC1",
        "Practice table A",
        "Point P1 coordinates 10,20; basis D-A, units U, epoch E1, stated precision one unit."
      ],
      [
        "LSC2",
        "Practice table B",
        "P1 coordinates 11,21; datum and epoch unspecified, units U. No identity cross-reference beyond the short name."
      ],
      [
        "LSC3",
        "Compatible check table",
        "Point P1 explicitly linked to table A under D-A/U/E1; coordinates 10,20 at the same stated precision."
      ]
    ],
    "question": "Which records support a same-basis comparison, and can A-to-B differences be interpreted as movement from the shared name and units?",
    "answer": "LSC1 and LSC3 explicitly share point identity, D-A basis, U units, E1 epoch and stated precision, supporting their documented same-basis comparison. LSC2 omits datum, epoch and a verified point link. Its one-unit coordinate differences do not establish physical movement or a valid transformation. Preserve all coordinate metadata and request the missing basis before merging or interpreting the tables.",
    "failureModes": [
      "Joining coordinate tables on short point names alone.",
      "Calling a coordinate difference movement when datum, epoch or identity is unknown."
    ],
    "fields": [
      [
        "Point identity and source link",
        "Defines whether two rows describe the same control."
      ],
      [
        "Datum, units and epoch",
        "Preserves the reference basis."
      ],
      [
        "Stated precision",
        "Limits interpretations of small differences."
      ]
    ],
    "holdout": "Provide B's datum but a different epoch and no transformation. Require the model to resolve one metadata field without declaring full comparability.",
    "boundary": "Use fictional geometry and labels. Exclude boundaries, client maps, actual coordinates and infrastructure."
  }
}