@staticmethod
def get_number_of_points(rf):
    """
        Return the total number of points for a radar:
            - For a masked array this all all points that are not masked
            - For a normal array this is all points
 
        :param rf: (masked) array of reflectivity measurements
        :type rf: numpy.ndarray
        :returns: total number of measurement points of the radar
        :rtype: int
        """
    try:
        return len(rf.count(axis=0).flatten().nonzero()[0])
    except AttributeError:
        return len(rf[(0), :].flatten())
