docs: function confidenceScore(bbox) {
    if (bbox === undefined) { return 0 }
    let result = 0
    const poly = bboxPolygon(bbox)
    const sw = helpers.point(poly.geometry.coordinates[0][0])
    const ne = helpers.point(poly.geometry.coordinates[0][2])
    const d = distance(sw, ne, 'kilometers')
    scoreMatrix.map(step => {
      const [score, maximum] = step
      if (d < maximum) { result = score }
      if (d >= 25) { result = 1 }
    })
    return result
  }