Flightradar24 zones

{
  "version": 4,
  ...
  "northamerica": {
    "tl_y": 75,
    "tl_x": -180.0,
    "br_y": 3.0,
    "br_x": -52,
    "subzones" : {
      "na_n" : {"tl_y":72.82,"tl_x":-177.97,"br_y":41.92,"br_x":-52.48},
      "na_c" : {"tl_y":54.66,"tl_x":-134.68,"br_y":22.16,"br_x":-56.91,
      "subzones" : {
          ...
          "na_nw" : {"tl_y":54.12,"tl_x":-134.13,"br_y":38.32,"br_x":-96.75},
          "na_ne" : {"tl_y":53.72,"tl_x":-98.76,"br_y":38.22,"br_x":-57.36},
          ...
        }
      },
      "na_s" : {"tl_y":41.92,"tl_x":-177.83,"br_y":3.82,"br_x":-52.48} 
    }
  },
  ...
}