docs: def haversine(lat1, lon1, lat2, lon2):
      """
      compute the distance in meters between two points in latlon
  
      Parameters
      ----------
      lat1: int or float
          the latitude of point 1
      lon1: int or float
          the longitude of point 1
      lat2: int or float
          the latitude of point 2
      lon2: int or float
          the longitude of point 2
  
      Returns
      -------
      float
          the distance between point 1 and point 2 in meters
  
      """
      radius = 6371000
      lat1, lon1, lat2, lon2 = map(math.radians, [lat1, lon1, lat2, lon2])
      a = math.sin((lat2 - lat1) / 2) ** 2 + math.cos(lat1) * math.cos(lat2) * math.sin((lon2 - lon1) / 2) ** 2
      c = 2 * math.asin(math.sqrt(a))
      return radius * c