======Py4CATS======
==== Python scripts for Computational ATmospheric Spectroscopy ====
{{ :lines2od.jpg?700 |}}

====From Hitran/Geisa to Molecular Optical Depths====

  * **extract** (select) lines of a certain molecule (and isotope) and/or wavenumber range from line parameter database 
  * **lbl2od** computation of line-by-line optical depth due to molecular absorption 

==== Download software ====

{{:lblod4esas_v2.tgz|}}

[[Previous Versions]]

==== Installation ====

Prerequisites: 
  * Python (version 2.5 or better)  [[http://www.python.org|python.org]]
  * numpy — Numeric Python [[http://www.numpy.org|numpy.org]]
  * Additionally (depending on some of the options set):
    * scipy — Scientific Python [[http://www.scipy.org|scipy.org]]
    * matplotlib
  * (Obviously you also need a copy of the Hitran or Geisa line parameter databases)

  - Save the package at some convenient place and unpack it: ''tar xvfz lblod4esas.tgz''
  - Ideally add the ''bin'' directory to your system search ''PATH''
  - If you are reading user guide's etc: in your browser open the ''index.html'' file in the ''doc'' directory;\\ Otherwise just ''extract'' line parameters from HITRAN and GEISA, then compute optical depth via cross sections by ''lbl2od'' 



==== Contact ====

//[[franz.schreier@dlr.de|Franz Schreier]]//