[
  {
    "type": "overmap_terrain",
    "id": "desert",
    "copy-from": "generic_open_land",
    "name": "desert",
    "sym": ".",
    "color": "yellow",
    "see_cost": 2,
    "extras": "field",
    "spawns": { "group": "GROUP_DESERT", "population": [ 0, 1 ], "chance": 13 },
    "mapgen": [ { "method": "builtin", "name": "field" } ],
    "flags": [ "NO_ROTATE" ]
  }
]
