{
  "created_at_utc": "2026-10-25T03:46:44.154091+00:00",
  "dataset": "cities_game_metrics_205.csv",
  "rows": 205,
  "columns": 97,
  "complete": true,
  "input_city_sha256": "bcf4624038f1b4ad4a3934f2a0884b90b4f4e263711695d99cf7616092d73977",
  "geographic_baseline_sha256": "10dee19f54351d7d83c3536ad60d88c604022235d7a437caf27f62ad8a98f421",
  "output_sha256": "e32f98983534f72f457329efe99dd12b88a2d3680c8aeb6676cff6e9d4bc68ff",
  "identifiers": "GeoNames IDs and exact reference coordinates; same 205 cities in original order",
  "geographic_lines": [
    {
      "dataset": "ne_10m_geographic_lines",
      "url": "https://naturalearth.s3.amazonaws.com/10m_physical/ne_10m_geographic_lines.zip",
      "source_page": "https://www.naturalearthdata.com/downloads/10m-physical-vectors/",
      "sha256": "ecde48e336ba45fecc56c3bc8cc6d5075f2c4f7f856fb844e0e76a59256e6037",
      "feature_count": 6
    }
  ],
  "retained_distances": "Audited Natural Earth 1:10 million WGS84 geodesic distances; four additional named latitude-line distances recomputed from the same archive",
  "elevation_source": "NOAA ETOPO 2022 v1, surface, 15 arc-seconds; nearest source pixel; EGM2008 heights",
  "climate_source": "NASA POWER/MERRA-2 climatology, January 2001–December 2025; all 205 returned the same period",
  "annual_precipitation_method": "Sum of 12 monthly mean PRECTOTCORR rates in mm/day times the average calendar days of each month across 2001–2025; includes rain and snow water equivalent",
  "seasonal_temperature_method": "Maximum minus minimum of 12 climatological monthly mean T2M temperatures; Fahrenheit difference = Celsius difference times 1.8",
  "tree_cover_method": "ESA WorldCover 2021 v200, native 10 m class 10; geodesic 20 km circle; ellipsoid pixel-area weights; valid non-water land denominator, class 80 water excluded; exact geodesic boundary-center checks",
  "population_method": "GHS-POP R2023A E2020, 1 km Mollweide; population cell centers within geodesic 25 km circle; residents / full geodesic circle area including water",
  "excluded_legacy_clues": [
    "river",
    "road",
    "railway",
    "port",
    "reef",
    "nearest tropic",
    "nearest polar circle",
    "glaciated area",
    "Antarctic ice shelf",
    "combined geographic-line minima",
    "broad unfiltered boundary/river distances"
  ],
  "first_clue": {
    "source": "NASA POWER/MERRA-2 climatology",
    "start_year": 2001,
    "end_year": 2025,
    "selection": "Player local calendar month at mission start; held fixed for that mission",
    "offline": true,
    "lookup_json": "monthly_climate_205.json",
    "lookup_csv": "monthly_climate_205.csv",
    "definition": "Typical calendar-month mean across all hours, not current-year weather or a daytime-only average"
  },
  "source_archive_sha256": {
    "ghsl_population_2020_1km.zip": "40ccf52af857a82cd327b882d1ebb901f84363b0e7e6806ccee56b0a85df6d2c"
  },
  "game_scope": "Game city data and clue themes synchronized with the finalized metrics; offline monthly climate replaces the old provider; shield rules unchanged for rounds 1–5; final round uses direct circular city buttons",
  "monthly_climate_lookup_sha256": {
    "monthly_climate_205.csv": "8b72876dc59dc5fad42a3353a817d082b9329a1d56847756e113b481b55cf4cb",
    "monthly_climate_205.json": "d478ec2dbb53f3d9ea7ff4ed71c6d4965b568d83f78d61bea46932c299444283"
  }
}