{
  "schema_version": 1,
  "generated_at_utc": "2026-05-16T04:33:53Z",
  "source_registry": "Data/Tiles/ground_zero_tiles.json",
  "generation_rule": "Only tiles with real source status and explicit growing-zone data are emitted.",
  "tiles": [
    {
      "tile_id": "gz_us_ca_pacifica_utm10n_e544_n4160",
      "center_latitude": 37.5925,
      "center_longitude": -122.4995,
      "growing_zone_label": "USDA 10a",
      "climate_profile": "coastal_mediterranean_mild",
      "growing_season_start_day": 46,
      "growing_season_end_day": 350,
      "frost_free_days": 305,
      "min_average_growing_temp_c": 7.0,
      "crop_safety_buffer_days": 14,
      "data_basis": "MVP conservative coastal Pacifica profile; replace with authoritative zone/temperature datasets during regional expansion."
    }
  ]
}