{
  "params": {
    "size": {
      "type": "range",
      "min": 8,
      "max": 20,
      "step": 1,
      "default": 12,
      "label": "Size",
      "describe": "Width of the pad in metres. 8 fits a light scout helicopter, 20 a heavy transport."
    },
    "shape": {
      "type": "choice",
      "options": [
        "square",
        "round"
      ],
      "default": "square",
      "label": "Shape",
      "describe": "Square pad with a straight border or a round pad with a ring border."
    },
    "surface": {
      "type": "choice",
      "options": [
        "concrete",
        "steel mat",
        "gravel"
      ],
      "default": "concrete",
      "label": "Surface",
      "describe": "concrete (poured slab with expansion joints), steel mat (field matting of interlocking steel planks, dark grey-green) or gravel (packed stone, tan)."
    },
    "marking": {
      "type": "choice",
      "options": [
        "H",
        "cross",
        "triangle"
      ],
      "default": "H",
      "label": "Centre mark",
      "describe": "The symbol inside the aiming circle: H (the standard helipad letter shape), cross (a plus sign) or triangle (pointing to +Z, the approach direction)."
    },
    "lights": {
      "type": "toggle",
      "default": true,
      "label": "Edge lights",
      "describe": "Small lights on short posts around the edge; they glow green at night. Off leaves a bare pad."
    }
  },
  "presets": {
    "field lz": {
      "surface": "steel mat",
      "size": 10,
      "marking": "cross"
    },
    "desert pad": {
      "surface": "gravel",
      "shape": "round",
      "size": 14,
      "marking": "triangle"
    },
    "heavy lift pad": {
      "size": 20,
      "lights": true
    }
  },
  "night": {
    "lamp": {
      "zone": "lamp",
      "color": "#6dff8a",
      "intensity": 1.6,
      "describe": "Green edge lights around the pad."
    }
  }
}