docs/examples/extrusion/tileset.json

{
  "tilejson": "2.2.0",
  "center": [
    0.1278,
    51.5074,
    14.0
  ],
  "bounds": [
    -0.511482,
    51.28554,
    0.335437,
    51.69344
  ],
  "minzoom": 12.0,
  "maxzoom": 14.0,
  "tiles": [
    "http://localhost:9000/tiles/{z}/{x}/{y}.mvt"
  ],
  "vector_layers": [
    {
      "id": "building",
      "queries": [
        {
          "minzoom": 12,
          "maxzoom": 20,
          "sql": "SELECT id, tags || jsonb_build_object('building:height', (CASE WHEN tags ->> 'building:levels' ~ '^[0-9\\\\.]+$' THEN tags ->> 'building:levels' ELSE '1' END)::real * 3), geom FROM osm_ways WHERE tags ? 'building'"
        }
      ]
    }
  ]
}