{
  "version": 3,
  "crs": "EPSG:4326",
  "method": "Three control points in Web Mercator: chimney fixed; least-squares rotation and uniform horizontal scale fitted to owner entrance and fountain pins. Not surveyed.",
  "anchor": {
    "latitude": 26.85075,
    "longitude": 80.94463888888889,
    "modelX": -12.996,
    "modelZ": -7.484
  },
  "entrance": {
    "latitude": 26.850361502013545,
    "longitude": 80.94451034937494,
    "modelX": -14.52,
    "modelZ": 37.22
  },
  "clockwiseRotationFromModelNorthDegrees": 13.739881179045893,
  "horizontalScale": 1.050036814945653,
  "altitudeMetres": null,
  "surveyAccuracyMetres": null,
  "arPlacement": "session-based manual floor placement; no persistent spatial anchors",
  "modelNorth": "negative Z",
  "updated": "2026-10-24",
  "fountain": {
    "latitude": 26.850342165355933,
    "longitude": 80.9447440169114,
    "modelX": 5.57305,
    "modelZ": 30.71801,
    "modelReference": "Centre of water-feature mesh bounds; not the nearby Aqua sign"
  },
  "previousMasterplanFit": {
    "version": 2,
    "crs": "EPSG:4326",
    "method": "Rotation from the masterplan north arrow (model north is 6.15\u00b0 clockwise of true north) and true-metre scale from masterplan dimensions; translation least-squares fitted to the owner's two GPS points (residual about 1.8 m each); not surveyed",
    "anchor": {
      "latitude": 26.850765635090358,
      "longitude": 80.94459080724621,
      "modelX": -12.996,
      "modelZ": -7.484
    },
    "entrance": {
      "latitude": 26.850367384986924,
      "longitude": 80.94452725863897,
      "modelX": -14.52,
      "modelZ": 37.22
    },
    "clockwiseRotationFromModelNorthDegrees": 6.15,
    "horizontalScale": 1,
    "residualMetres": 1.8,
    "ownerSuppliedFit": {
      "anchor": {
        "latitude": 26.850771518063738,
        "longitude": 80.94460771650694,
        "modelX": -12.996,
        "modelZ": -7.484
      },
      "entrance": {
        "latitude": 26.850361502013545,
        "longitude": 80.94451034937494,
        "modelX": -14.52,
        "modelZ": 37.22
      },
      "clockwiseRotationFromModelNorthDegrees": 10.009779209005687,
      "horizontalScale": 1.0418922467456326
    },
    "altitudeMetres": null,
    "surveyAccuracyMetres": null,
    "arPlacement": "session-based manual floor placement; no persistent spatial anchors",
    "modelNorth": "negative Z",
    "updated": "2026-10-24"
  },
  "baselineMetres": 45.092218119853406,
  "controlResiduals": [
    {
      "point": "anchor",
      "metres": 0
    },
    {
      "point": "entrance",
      "metres": 1.9711834328648674
    },
    {
      "point": "fountain",
      "metres": 2.0757879991844335
    }
  ],
  "verandahReference": {
    "latitude": 26.85088888888889,
    "longitude": 80.94441666666667,
    "name": "Left end of arched verandah corridor",
    "source": "Owner supplied DMS coordinates, 24 October 2026",
    "usedInFit": false,
    "reason": "Exact corresponding model endpoint requires visual confirmation"
  }
}