def open(filename, frame='unspecified'):
        """Create a Direction from data saved in a file.

        Parameters
        ----------
        filename : :obj:`str`
            The file to load data from.

        frame : :obj:`str`
            The frame to apply to the created Direction.

        Returns
        -------
        :obj:`Direction`
            A Direction created from the data in the file.
        """
        data = BagOfPoints.load_data(filename)
        return Direction(data, frame)
Create a Direction from data saved in a file.

        Parameters
        ----------
        filename : :obj:`str`
            The file to load data from.

        frame : :obj:`str`
            The frame to apply to the created Direction.

        Returns
        -------
        :obj:`Direction`
            A Direction created from the data in the file.