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Subsections


8.2 Analysing the Data

To help you in analysing and processing further the LWS data we recommend that you make use of the two packages especially developed for this purpose: ISAP and LIA.
The user is also refered to the LWS data reduction recipes.


8.2.1 LWS data reduction recipes

The recipes are available from:

         http://www.iso.vilspa.esa.es/ $\rightarrow$ ISO Explanatory Library $\rightarrow$ LWS

The recipes are structured as worked examples for the following AOT types:


8.2.2 The ISO Spectral Analysis Package (ISAP)

This is a software package that was specifically written for LWS and SWS data. The package was written jointly by the LWS Instrument Team, the SWS Instrument Team and IPAC. It can read in the product files and write as ouput FITS files, ASCII files or IDL save files. This package requires an IDL licence and the IDL path should also include the IDL astronomy library which is available at:

         http://idlastro.gsfc.nasa.gov/

The routines in ISAP have been tailored to reduce LWS data. ISAP allows the user to flag or delete data points that are clearly wrong (due to undetected glitches for instance) and to perform most of the basic operations for spectral analysis like averaging scans with different averaging routines, scaling the detectors to make smooth spectra, rebinning spectra to a standard wavelength scale, adding a constant, averaging spectra, subtracting a background spectrum from a spectrum, measuring line intensities and fitting line profiles, as well as some LWS specific operations like defringing the data.

A full set of documentation, including cookbooks for reducing each observation type is available with ISAP.

ISAP can be downloaded from the ISO website in IPAC:

         http://www.ipac.caltech.edu/iso/ $\rightarrow$ ISAP

or

         http://www.iso.vilspa.esa.es/ $\rightarrow$ ISO Data Analysis Software $\rightarrow$ ISAP


8.2.3 The LWS Interactive Analysis (LIA)

This package is written as a set of IDL routines, to be used together with ISAP. The routines are written to allow users to inspect, reprocess and recalibrate their LWS data with the possibility of interactively customizing the various data reduction stages to their particular set of data. It also allows some extra functionalities, like the interactive FP responsivity correction. LIA is a joint developement of the ISO-LWS Instrument Team at Rutherford Appleton Laboratories (RAL, UK - the PI Institute) and the Infrared Processing and Analysis Center (IPAC/Caltech, USA).

As of June 2003 the current version of LIA is version 10.1. LIA can be downloaded from the UKIDC web site:

         http://jackal.bnsc.rl.ac.uk/isouk/

or

         http://www.iso.vilspa.esa.es/ $\rightarrow$ ISO Data Analysis Software $\rightarrow$ LIA

A full set of documentation is available at this web site. If you need further help with LIA, you can contact the UK ISO National Data Centre ( isouk@rl.ac.uk).

The following lists the routines included in LIA together with a short description.

In 2003 and 2004, it is planned to introduce a few new LIA routines.


next up previous contents index
Next: 8.3 Analysing Parallel/Serendipity Mode Up: 8. Getting Started with Previous: 8.1 Retrieving and Reading
ISO Handbook Volume III (LWS), Version 2.1, SAI/1999-057/Dc