{
  "layers": [
    {
      "id": "engineering_grid",
      "file": "layers/engineering_grid.geojson",
      "label": "Engineering",
      "description": "Hall modules 86.4\u00d723.4\u00d710, 18 kN/m\u00b2, duct 5\u00d73, drive-in 7.5\u00d75, boulevard 12 m clear"
    },
    {
      "id": "fire_egress",
      "file": "layers/fire_egress.geojson",
      "label": "Fire / life safety",
      "description": "Egress schematic, sprinkler notes, boulevard clear, West/East assembly"
    },
    {
      "id": "crowd_capacities",
      "file": "layers/crowd_capacities.geojson",
      "label": "Crowd control",
      "description": "68,750 hall capacity, boulevard choke, assembly, Martyn Law capacity note"
    },
    {
      "id": "security_entries",
      "file": "layers/security_entries.geojson",
      "label": "Security (public)",
      "description": "West/East entries + drive-in doors \u2014 no CCTV/ops"
    }
  ],
  "coordinate_system": "+X east, +Y north, +Z up; local metres; origin_wgs84 in meta",
  "generated": "2026-09-22T07:43:00.917801+00:00"
}