code: def point_distance(point1, point2):
      
      lon1 = point1['coordinates'][0]
      lat1 = point1['coordinates'][1]
      lon2 = point2['coordinates'][0]
      lat2 = point2['coordinates'][1]
      deg_lat = number2radius(lat2 - lat1)
      deg_lon = number2radius(lon2 - lon1)
      a = math.pow(math.sin(deg_lat / 2), 2) + math.cos(number2radius(lat1)) * \
          math.cos(number2radius(lat2)) * math.pow(math.sin(deg_lon / 2), 2)
      c = 2 * math.atan2(math.sqrt(a), math.sqrt(1 - a))
      return (6371 * c) * 1000
docs: calculate the distance between two points on the sphere like google map
      reference http://www.movable-type.co.uk/scripts/latlong.html
  
      Keyword arguments:
      point1  -- point one geojson object
      point2  -- point two geojson object
  
      return distance