def _convert_float32_to_float64(data):
    """
        Converts DataArray values of float32 to float64
        :param data: Xarray dataset of coverage data

        :returns: Xarray dataset of coverage data
        """

    for var_name in data.variables:
        if data[var_name].dtype == 'float32':
            og_attrs = data[var_name].attrs
            data[var_name] = data[var_name].astype('float64')
            data[var_name].attrs = og_attrs

    return data