{
  "$schema": "https://json-structure.org/meta/core/v0/#",
  "$id": "https://raw.githubusercontent.com/api-evangelist/aviationweather/refs/heads/main/json-structure/aviationweather-gairmet-structure.json",
  "name": "AviationWeather Graphical AIRMET (G-AIRMET)",
  "description": "Decoded G-AIRMET as returned by GET /api/data/gairmet?format=json.",
  "type": "object",
  "properties": {
    "gairmetId": {
      "type": "int32"
    },
    "product": {
      "type": "string",
      "enum": [
        "sierra",
        "tango",
        "zulu"
      ],
      "description": "Product type (Sierra=IFR/MTN obs, Tango=turb/wind, Zulu=ice/freezing level)."
    },
    "issueTime": {
      "type": "int32",
      "description": "UNIX epoch issuance time."
    },
    "validTime": {
      "type": "int32",
      "description": "UNIX epoch valid time for this forecast snapshot."
    },
    "fcstHour": {
      "type": "int32",
      "enum": [
        0,
        3,
        6,
        9,
        12
      ],
      "description": "Forecast hour from issuance."
    },
    "hazard": {
      "type": "string",
      "enum": [
        "turb-hi",
        "turb-lo",
        "llws",
        "sfc_wind",
        "ifr",
        "mtn_obs",
        "ice",
        "fzlvl"
      ],
      "description": "Hazard type."
    },
    "tops": {
      "type": [
        "integer",
        "null"
      ],
      "description": "Top altitude (feet)."
    },
    "base": {
      "type": [
        "integer",
        "null"
      ],
      "description": "Base altitude (feet)."
    },
    "dueTo": {
      "type": [
        "string",
        "null"
      ],
      "description": "Cause of the hazard (e.g. CIG/VIS, BR/HZ)."
    },
    "geometryType": {
      "type": "string",
      "enum": [
        "Polygon",
        "MultiPolygon",
        "LineString"
      ]
    },
    "coords": {
      "type": "array",
      "description": "Coordinate ring (lon, lat)."
    }
  }
}