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- id: boiling
  provider:
    name: transform
    threads: 2
    formula: |
      import "math"
      func transform(r, g, b, a uint8) (uint8, uint8, uint8, uint8) {
        minTemp := 80.0
        maxTemp := 100.0
        minCol := 20.0
        maxCol := 200.0
        elevation := -10000 + ((float64(r) * 256 * 256 + float64(g) * 256 + float64(b)) * 0.1)
        pressure := math.Pow(1 - .0000225577 * elevation, 5.25588)
        boiling := 1.0 / (1.0/373 - math.Log(pressure) / 4890) - 273
        c := uint8((boiling - minTemp) / (maxTemp - minTemp) * (maxCol - minCol) + minCol)
        return c,c,c,255
      }
    provider:
      name: fallback
      primary:
        name: proxy
        url: https://api.mapbox.com/v4/mapbox.terrain-rgb/{z}/{x}/{y}.pngraw?access_token={env.MAPBOX_KEY}
      secondary:
        name: static
        color: "0186a0"