def mmi_to_delimited_file(self, force_flag=True):
        """Save mmi_data to delimited text file suitable for gdal_grid.

        The output file will be of the same format as strings returned from
        :func:`mmi_to_delimited_text`.

        :param force_flag: Whether to force the regeneration of the output
            file. Defaults to False.
        :type force_flag: bool

        :returns: The absolute file system path to the delimited text file.
        :rtype: str

        .. note:: An accompanying .csvt will be created which gdal uses to
           determine field types. The csvt will contain the following string:
           "Real","Real","Real". These types will be used in other conversion
           operations. For example to convert the csv to a shp you would do::

              ogr2ogr -select mmi -a_srs EPSG:4326 mmi.shp mmi.vrt mmi
        """
        LOGGER.debug('mmi_to_delimited_text requested.')

        csv_path = os.path.join(
            self.output_dir, 'mmi.csv')
        # short circuit if the csv is already created.
        if os.path.exists(csv_path) and force_flag is not True:
            return csv_path
        csv_file = open(csv_path, 'w')
        csv_file.write(self.mmi_to_delimited_text())
        csv_file.close()

        # Also write the .csvt which contains metadata about field types
        csvt_path = os.path.join(
            self.output_dir, self.output_basename + '.csvt')
        csvt_file = open(csvt_path, 'w')
        csvt_file.write('"Real","Real","Real"')
        csvt_file.close()

        return csv_path
Save mmi_data to delimited text file suitable for gdal_grid.

        The output file will be of the same format as strings returned from
        :func:`mmi_to_delimited_text`.

        :param force_flag: Whether to force the regeneration of the output
            file. Defaults to False.
        :type force_flag: bool

        :returns: The absolute file system path to the delimited text file.
        :rtype: str

        .. note:: An accompanying .csvt will be created which gdal uses to
           determine field types. The csvt will contain the following string:
           "Real","Real","Real". These types will be used in other conversion
           operations. For example to convert the csv to a shp you would do::

              ogr2ogr -select mmi -a_srs EPSG:4326 mmi.shp mmi.vrt mmi