def _parse_envi(meta):
    """Parse ENVI metadata into Python data structures.

    See the link for information on the ENVI header file format:
    http://www.harrisgeospatial.com/docs/enviheaderfiles.html

    Parameters
    ----------
    meta : dict
        Dictionary of keys and str values to parse, as returned by the rasterio
        tags(ns='ENVI') call.

    Returns
    -------
    parsed_meta : dict
        Dictionary containing the original keys and the parsed values

    """

    def parsevec(s):
        return np.fromstring(s.strip('{}'), dtype='float', sep=',')

    def default(s):
        return s.strip('{}')

    parse = {'wavelength': parsevec,
             'fwhm': parsevec}
    parsed_meta = {k: parse.get(k, default)(v) for k, v in meta.items()}
    return parsed_meta