{
  "title": "Sacred Geometry Atlas measurement evidence register",
  "asOf": "2026-08-23",
  "defaultCurrentGeometryEvidence": {
    "length": "schematic",
    "span": "schematic",
    "height": "schematic",
    "radius": "schematic",
    "module": "schematic",
    "bayCount": "schematic"
  },
  "evidenceDefinitions": {
    "reference-dimension": "A dimension published by an institutional or scholarly source.",
    "scan-derived": "A dimension extracted from a registered, scale-controlled scan, mesh, orthophoto, or photogrammetric model.",
    "native-reconstruction": "A reproducible shape statistic computed in a photogrammetric reconstruction's native coordinate units; it is not a metric building dimension.",
    "image-derived": "A ratio measured from a photograph; it is not metric without scale and camera-control evidence.",
    "schematic": "An Atlas comparison input; it is not a survey measurement."
  },
  "records": [
    {
      "id": "basilica",
      "currentGeometryEvidence": {
        "length": "reference-dimension",
        "span": "reference-dimension"
      },
      "publishedMeasurements": [
        {
          "field": "length",
          "label": "overall basilica length",
          "value": 56,
          "unit": "m",
          "scope": "published whole-building dimension",
          "sourceUrl": "https://whc.unesco.org/en/list/788/"
        },
        {
          "field": "span",
          "label": "overall basilica width",
          "value": 30,
          "unit": "m",
          "scope": "published whole-building dimension",
          "sourceUrl": "https://whc.unesco.org/en/list/788/"
        }
      ]
    },
    {
      "id": "gothic",
      "currentGeometryEvidence": {
        "length": "reference-dimension",
        "height": "reference-dimension"
      },
      "publishedMeasurements": [
        {
          "field": "length",
          "label": "overall cathedral length",
          "value": 130.2,
          "unit": "m",
          "scope": "published overall length",
          "sourceUrl": "https://www.cathedrale-chartres.org/en/cathedrale/monument/architecture/the-13th-century-cathedral/"
        },
        {
          "field": "height",
          "label": "vault height",
          "value": 37.5,
          "unit": "m",
          "scope": "published nave vault height; not external height",
          "sourceUrl": "https://www.cathedrale-chartres.org/en/cathedrale/monument/architecture/the-13th-century-cathedral/"
        },
        {
          "field": "nave-span",
          "label": "nave span",
          "value": 16.4,
          "unit": "m",
          "scope": "published nave span; the Atlas span field remains schematic",
          "sourceUrl": "https://www.cathedrale-chartres.org/en/cathedrale/monument/architecture/the-13th-century-cathedral/"
        }
      ]
    },
    { "id": "byzantine", "publishedMeasurements": [] },
    { "id": "baroque", "publishedMeasurements": [] },
    { "id": "stave", "publishedMeasurements": [] },
    { "id": "concrete", "publishedMeasurements": [] },
    { "id": "san-vitale", "publishedMeasurements": [] },
    { "id": "hagia-sophia", "publishedMeasurements": [] },
    { "id": "speyer", "publishedMeasurements": [] },
    { "id": "durham", "publishedMeasurements": [] },
    { "id": "santiago", "publishedMeasurements": [] },
    { "id": "reims", "publishedMeasurements": [] },
    { "id": "cologne", "publishedMeasurements": [] },
    { "id": "monreale", "publishedMeasurements": [] },
    { "id": "saint-denis", "publishedMeasurements": [] },
    { "id": "urnes", "publishedMeasurements": [] },
    { "id": "kizhi", "publishedMeasurements": [] },
    { "id": "san-giorgio", "publishedMeasurements": [] },
    { "id": "redentore", "publishedMeasurements": [] },
    {
      "id": "st-pauls",
      "currentGeometryEvidence": {
        "length": "reference-dimension",
        "span": "reference-dimension",
        "height": "reference-dimension"
      },
      "nativeReconstructionEvidence": {
        "measurementOutput": "research/st-pauls-colmap.json",
        "status": "native-reconstruction",
        "sparsePointCount": 98872,
        "cameraCount": 615,
        "denseDepthMapCount": 615,
        "interiorModel": {
          "assetPath": "research/raw/st-pauls/st-pauls-zenodo-interior.glb",
          "measurementOutput": "research/asset-measurements.json",
          "vertexCount": 1837701,
          "faceCount": 2500000,
          "nativeBoundsExtent": [162.318114986, 78.10801262, 79.562324352],
          "nativeDiagonal": 196.921800581,
          "scaleStatus": "unknown-until-control-is-verified"
        },
        "scaleStatus": "unscaled-reconstruction; no verified model-to-published-control correspondence",
        "note": "Use the raw and robust native-coordinate bounds for proportion testing only. Do not replace the published metre dimensions or infer the historical construction team from the point cloud."
      },
      "publishedMeasurements": [
        {
          "field": "length",
          "label": "cathedral length",
          "value": 169.2,
          "unit": "m",
          "scope": "published length including western steps",
          "sourceUrl": "https://www.cityoflondon.gov.uk/assets/Services-Environment/ed-htb34-protected-views-spd.pdf"
        },
        {
          "field": "span",
          "label": "greatest breadth",
          "value": 75,
          "unit": "m",
          "scope": "published greatest breadth",
          "sourceUrl": "https://www.cityoflondon.gov.uk/assets/Services-Environment/ed-htb34-protected-views-spd.pdf"
        },
        {
          "field": "height",
          "label": "overall height",
          "value": 111.6,
          "unit": "m",
          "scope": "published height above pavement to top of cross",
          "sourceUrl": "https://www.cityoflondon.gov.uk/assets/Services-Environment/ed-htb34-protected-views-spd.pdf"
        }
      ]
    },
    { "id": "karlskirche", "publishedMeasurements": [] },
    { "id": "ronchamp", "publishedMeasurements": [] },
    { "id": "brasilia", "publishedMeasurements": [] },
    { "id": "thorncrown", "publishedMeasurements": [] }
  ]
}