code: 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
  }
docs: Generates a confidence score from 1 (worst) to 10 (best) from a given BBox
  
  @param {BBox} bbox extent in [minX, minY, maxX, maxY] order
  @returns {number} confidence score
  @example
  confidenceScore([-75.1, 45.1, -75, 45])
  //=4
  confidenceScore([-75.001, 45.001, -75, 45])
  //=10