{
  "created_utc": "2026-10-20",
  "purpose": "Reproducible exploratory original calculations only; not replacements for studies requiring road networks, NOAA shoreline geometry, or authoritative current population.",
  "studies": [
    {
      "slug": "historic-county-counts",
      "rows": 51,
      "data": "historic-county-counts.csv",
      "figure": "historic-county-counts.png",
      "source": "Bundled legacy UScounties shapefile attributes: state names and GEOIDs; source vintage not independently verified. No claims about current Census county counts."
    },
    {
      "slug": "curated-city-latitudes",
      "rows": 87,
      "data": "curated-city-latitudes.csv",
      "figure": "curated-city-latitudes.png",
      "source": "87 manually curated city reference centers in city-radius-starters-v10.json; nonrandom and not representative of the world."
    },
    {
      "slug": "approximate-area-comparison-ratios",
      "rows": 22,
      "data": "approximate-area-comparison-ratios.csv",
      "figure": "approximate-area-comparison-ratios.png",
      "source": "Bundled approximate polygon areas from comparisons-23.json; states/countries and coastlines may have incomparable definitions."
    }
  ],
  "source_sha256": {
    "us-state-counties.json": "de715fee254ae312f1328ba9af3d045df183841f904218336ab89e873a5e035a",
    "city-radius-starters-v10.json": "8134e07df6bfa352694727039697cc0e9a33b52f6523fe38b6c006061013daf0",
    "comparisons-23.json": "da9d9149aaa433d51a7b4e0fc93b3dab0deffb4d4f540f717d7dd1e48ac7fe8d"
  }
}