[
  {
    "type": "overmap_terrain",
    "id": "open_air",
    "name": "open air",
    "sym": ".",
    "color": "blue",
    "see_cost": "all_clear",
    "vision_levels": "roof_or_air",
    "travel_cost_type": "air",
    "uniform_terrain": "t_open_air",
    "flags": [ "NO_ROTATE" ]
  },
  {
    "type": "overmap_terrain",
    "id": [ "field", "isherwood_barry_rescue_field" ],
    "copy-from": "generic_open_land",
    "name": "field",
    "sym": ".",
    "color": "brown",
    "vision_levels": "always_full",
    "see_cost": "none",
    "extras": "field",
    "spawns": { "group": "GROUP_FOREST", "population": [ 0, 1 ], "chance": 13 },
    "travel_cost_type": "field",
    "flags": [ "NO_ROTATE" ]
  },
  {
    "type": "overmap_terrain",
    "id": "forest",
    "copy-from": "generic_forest",
    "name": "forest",
    "sym": "F",
    "color": "green",
    "see_cost": "spaced_high",
    "extras": "forest",
    "spawns": { "group": "GROUP_FOREST", "population": [ 0, 3 ], "chance": 13 },
    "travel_cost_type": "forest",
    "flags": [ "NO_ROTATE", "SOURCE_FORAGE" ]
  },
  {
    "type": "overmap_terrain",
    "id": "forest_thick",
    "copy-from": "generic_forest",
    "name": "forest",
    "sym": "F",
    "color": "green",
    "see_cost": "spaced_high",
    "extras": "forest_thick",
    "spawns": { "group": "GROUP_FOREST", "population": [ 0, 6 ], "chance": 15 },
    "mapgen": [ { "builtin": "forest" } ],
    "flags": [ "NO_ROTATE", "SOURCE_FORAGE" ]
  },
  {
    "type": "overmap_terrain",
    "id": "forest_water",
    "copy-from": "generic_wetland_forest",
    "name": "swamp",
    "sym": "F",
    "color": "cyan",
    "vision_levels": "forested_swampy",
    "see_cost": "spaced_high",
    "extras": "forest_water",
    "spawns": { "group": "GROUP_SWAMP", "population": [ 2, 6 ], "chance": 50 },
    "mapgen": [ { "builtin": "forest" } ],
    "travel_cost_type": "swamp",
    "flags": [ "NO_ROTATE", "SOURCE_FORAGE", "RISK_HIGH" ]
  },
  {
    "type": "overmap_terrain",
    "id": "standing_stones",
    "name": "standing stones",
    "sym": "O",
    "color": "dark_gray",
    "vision_levels": "open_land",
    "see_cost": "medium",
    "spawns": { "group": "GROUP_STANDING_STONES", "population": [ 1, 4 ], "chance": 100 },
    "flags": [ "NO_ROTATE" ]
  },
  {
    "type": "overmap_terrain",
    "id": [ "temple_stairs", "temple_underground_1", "temple_underground_2", "temple_underground_3", "temple_underground_4" ],
    "name": "strange temple",
    "//": "Wrong, but doesn't really matter, for underground omts",
    "vision_levels": "open_land",
    "sym": "T",
    "color": "pink",
    "see_cost": "none",
    "flags": [ "KNOWN_DOWN" ]
  },
  {
    "type": "overmap_terrain",
    "id": "temple_finale",
    "vision_levels": "underground_stone",
    "name": "strange temple",
    "sym": "T",
    "color": "yellow",
    "see_cost": "full_high",
    "flags": [ "KNOWN_DOWN" ]
  },
  {
    "type": "overmap_terrain",
    "id": "cave",
    "vision_levels": "natural_outcropping",
    "name": "cave",
    "sym": "C",
    "color": "brown",
    "see_cost": "high",
    "flags": [ "NO_ROTATE", "SOURCE_SAFETY" ]
  },
  {
    "type": "overmap_terrain",
    "id": "cave_underground",
    "vision_levels": "underground_dirt",
    "name": "cave",
    "sym": "C",
    "color": "brown",
    "see_cost": "full_high",
    "flags": [ "NO_ROTATE", "SOURCE_SAFETY" ]
  },
  {
    "type": "overmap_terrain",
    "id": "cave_rat_underground",
    "name": "rat cave",
    "looks_like": "cave_underground",
    "vision_levels": "underground_dirt",
    "sym": "C",
    "color": "brown",
    "see_cost": "full_high",
    "flags": [ "NO_ROTATE", "SOURCE_SAFETY" ]
  },
  {
    "type": "overmap_terrain",
    "id": "cave_rat",
    "name": "rat cave",
    "vision_levels": "natural_outcropping",
    "looks_like": "cave",
    "sym": "C",
    "color": "dark_gray",
    "see_cost": "full_high",
    "flags": [ "KNOWN_DOWN", "NO_ROTATE", "SOURCE_SAFETY" ]
  },
  {
    "type": "overmap_terrain",
    "//": "deep_rock is a placeholder solution to differentiate between subway tunnels, remove if per-special connection subtyping is implemented.",
    "id": [ "empty_rock", "deep_rock" ],
    "name": "solid rock",
    "vision_levels": "always_full",
    "sym": "%",
    "color": "dark_gray",
    "see_cost": "opaque",
    "travel_cost_type": "impassable",
    "uniform_terrain": "t_rock",
    "flags": [ "NO_ROTATE" ]
  }
]
