rs",
      filter: [">", ["get", "ele"], 0],
      paint: {
        "line-color": "rgba(0,0,0, 50%)",
        "line-width": ["match", ["get", "level"], 1, 1, 0.5],
      }
    }, "building")
    map.addLayer({
      id: "contour-labels",
      type: "symbol",
      source: "contour-source",
      "source-layer": "contours",
      filter: [">", ["get", "ele"], 0],
      layout: {
        "symbol-placement": "line",
        "text-size": 10,
        "text-field": ["concat", ["number-format", ["get", "ele"], {}