radis.db.hitemp_co2 module

HITEMP CO2 Block-Aligned Partial Decompression.

Implements efficient partial downloading and decompression of the HITEMP CO2 database using block-aligned bzip2 decompression for specific wavenumber ranges.

@author: dcmvd

get_bz2(session, file_url, offset=None, size=None, verbose=True)[source]

Download a byte range from a remote bzip2 file using HTTP range requests.

Parameters:

  • session (requests.Session) – Authenticated session

  • file_url (str) – URL of the remote file

  • offset, size (int, optional) – Byte range to download. If None, downloads entire file.

  • verbose (bool, default True) – If True, prints progress and status messages

Returns:

Downloaded file content

Return type:

bytes

partial_download_co2_chunk(target_wn_min, target_wn_max, session, output_file_path, verbose=True)[source]

Download and decompress a specific wavenumber range from HITEMP CO2 database.

Uses block-aligned partial decompression to extract only the requested wavenumber range without downloading the entire ~6GB file.

Parameters:

  • target_wn_min, target_wn_max (float) – Wavenumber range to extract (cm⁻¹)

  • session (requests.Session) – Authenticated HITRAN session

  • output_file_path (str) – Where to save the decompressed data

  • verbose (bool, default True) – If True, prints progress and status messages