spyfit is a Python package that provides a set of tools for easy handling of FTIR retrieval data and for flexible setup and execution of retrieval processing pipelines.

Our goal with spyfit is to provide deep integration with the libraries of the Python scientific stack and to promote the use of standard data models. Through the use of the xarray Python package, we adopt the Common Data Model for self-describing retrieval data (it can be viewed as an in-memory representation of a netCDF file).

NOTE: This package is currently under heavy development! API is not stable.

Get in touch

  • Report bugs, suggest feature ideas or view the source code on GitHub.


spyfit is available under the open-source GNU General Public License (GPLv3).


spyfit is part of various Python tools developped for FTIR spectroscopy and atmospheric chemistry modelling at the Infrared Group of Atmospheric and Solar Physics - GIRPAS laboratory (University of Liege, Belgium).