{
  "cities": [
 
    {
      "city_id": "C001",
      "name": "Beijing",

      "center": {
        "lat": 39.9042,
        "lng": 116.4074
      },

      "radius_m": 60000
    },
	
	{
      "city_id": "C002",
      "name": "XiAn",
	  
      "center": {
        "lat": 34.195848,
        "lng": 108.855414
      },
      "radius_m": 50000
    },
	
    {
      "city_id": "C003",
      "name": "Shanghai",

      "center": {
        "lat": 31.2304,
        "lng": 121.4737
      },

      "radius_m": 50000
    }

  ]
}