{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "$id": "https://liftradar.eu/ski/v1/tile.schema.json",
  "title": "liftradar ski tile",
  "description": "Lifts, runs and ski areas from OpenSkiData in one XYZ tile at zoom 10 (ski/v1/10/{x}/{y}.json). Data from OpenSkiData / OpenSkiMap.org, © OpenStreetMap contributors (ODbL).",
  "type": "object",
  "required": [
    "v",
    "areas",
    "lifts",
    "runs"
  ],
  "additionalProperties": false,
  "properties": {
    "v": {
      "const": 1
    },
    "areas": {
      "description": "OpenSkiData ski areas whose outline, point or lifts touch the tile.",
      "type": "array",
      "items": {
        "type": "object",
        "required": [
          "p"
        ],
        "additionalProperties": false,
        "properties": {
          "name": {
            "type": "string"
          },
          "lr": {
            "description": "The liftradar resort most of the area's lifts belong to.",
            "type": "object",
            "required": [
              "id",
              "name"
            ],
            "additionalProperties": false,
            "properties": {
              "id": {
                "type": "string",
                "pattern": "^[a-z]{2}/[a-z0-9-]+$"
              },
              "name": {
                "type": "string"
              }
            }
          },
          "osm": {
            "description": "OpenStreetMap id, e.g. way/123.",
            "type": "string"
          },
          "wd": {
            "description": "Wikidata id.",
            "type": "string"
          },
          "p": {
            "description": "A point in the area: [lon, lat].",
            "$ref": "#/$defs/position"
          },
          "outline": {
            "description": "Simplified outline (about 25 m), outer rings only: one ring per polygon.",
            "type": "array",
            "items": {
              "type": "array",
              "items": {
                "$ref": "#/$defs/position"
              }
            }
          }
        }
      }
    },
    "lifts": {
      "type": "array",
      "items": {
        "type": "object",
        "required": [
          "areas",
          "c"
        ],
        "additionalProperties": false,
        "properties": {
          "type": {
            "description": "OpenSkiData liftType, e.g. chair_lift, gondola, t-bar.",
            "type": "string"
          },
          "name": {
            "type": "string"
          },
          "ref": {
            "type": "string"
          },
          "status": {
            "enum": [
              "operating",
              "disused",
              "abandoned"
            ]
          },
          "capacity": {
            "description": "People per hour.",
            "type": "number"
          },
          "duration": {
            "description": "Ride time, seconds.",
            "type": "number"
          },
          "occupancy": {
            "description": "People per chair or cabin.",
            "type": "number"
          },
          "heating": {
            "type": "boolean"
          },
          "bubble": {
            "type": "boolean"
          },
          "tunnel": {
            "description": "The lift runs in a tunnel.",
            "type": "boolean"
          },
          "osm": {
            "type": "string"
          },
          "lr": {
            "description": "liftradar resort, <country>/<id>.",
            "type": "string",
            "pattern": "^[a-z]{2}/[a-z0-9-]+$"
          },
          "areas": {
            "description": "Indexes in this tile's areas.",
            "type": "array",
            "items": {
              "type": "integer",
              "minimum": 0
            }
          },
          "c": {
            "description": "The line, simplified (about 5 m), bottom station first as in OpenStreetMap: [lon, lat, elevation m].",
            "type": "array",
            "minItems": 2,
            "items": {
              "$ref": "#/$defs/position"
            }
          }
        }
      }
    },
    "runs": {
      "type": "array",
      "items": {
        "type": "object",
        "required": [
          "areas"
        ],
        "additionalProperties": false,
        "properties": {
          "uses": {
            "description": "downhill, nordic, skitour, sled, hike, snow_park, connection, …",
            "type": "array",
            "items": {
              "type": "string"
            }
          },
          "difficulty": {
            "enum": [
              "novice",
              "easy",
              "intermediate",
              "advanced",
              "expert",
              "freeride",
              "extreme"
            ]
          },
          "conv": {
            "description": "The colour convention of difficulty when not europe.",
            "enum": [
              "north_america",
              "japan"
            ]
          },
          "name": {
            "type": "string"
          },
          "ref": {
            "type": "string"
          },
          "grooming": {
            "description": "classic, skating, classic+skating, mogul, backcountry, scooter, …",
            "type": "string"
          },
          "lit": {
            "type": "boolean"
          },
          "oneway": {
            "type": "boolean"
          },
          "gladed": {
            "type": "boolean"
          },
          "patrolled": {
            "type": "boolean"
          },
          "tunnel": {
            "description": "The run goes through a tunnel.",
            "type": "boolean"
          },
          "osm": {
            "type": "string"
          },
          "lr": {
            "description": "liftradar resort, <country>/<id>.",
            "type": "string",
            "pattern": "^[a-z]{2}/[a-z0-9-]+$"
          },
          "areas": {
            "description": "Indexes in this tile's areas.",
            "type": "array",
            "items": {
              "type": "integer",
              "minimum": 0
            }
          },
          "c": {
            "description": "The run as a line, simplified (about 5 m): [lon, lat].",
            "type": "array",
            "minItems": 2,
            "items": {
              "$ref": "#/$defs/position"
            }
          },
          "poly": {
            "description": "A run that is an area: GeoJSON polygon rings.",
            "type": "array",
            "items": {
              "type": "array",
              "items": {
                "$ref": "#/$defs/position"
              }
            }
          }
        },
        "oneOf": [
          {
            "required": [
              "c"
            ]
          },
          {
            "required": [
              "poly"
            ]
          }
        ]
      }
    }
  },
  "$defs": {
    "position": {
      "type": "array",
      "minItems": 2,
      "maxItems": 3,
      "items": {
        "type": "number"
      }
    }
  }
}