Preparation for Data Reduction with PIA
Step 1. Unpack and Rename Data Files from the ISO Archive
If your data files are ftped from the ISO archive, they are in zipped tar files.
You need to unpack them. Also, all the lower-case letters in the names of
individual data files need to be converted into upper cases.
IPAC has a Unix script called "unpackiso" that
you can use to do unpacking and renaming simultaneously. (Note: you have to first
cd to the directory where your ISO zipped tar files are, then run this script.
Also, it will put all individual data files in the current directory.)
If you have already unpacked your tar files and only want to rename your files.
Try another IPAC Unix script called "pht_rename" .
Step 2. Find which object is in which directory
If you have a number of observations, you may find it useful to use an IPAC Perl
script called "pht_objects."
It will list all independent observations below the directory where it is called.
You can run it on an IPAC machine under your ISO guest account. To use it, first
cd to the desired directory, then simply type "pht_objects" at the prompt. If you
have access to Perl on your home-institute machine, you can get a copy of it and
run it on your own machine. A sample output is attached below:
--------------------------------------------------------------------------------------------------------------------
Target_name | AOT | P.I. | Proposal | OSN | OLP | Path_to_the_data
NGC 4696A_REF1| P37| NLU | COLD_GAL| 01 | OLP_43 | /home/lu/iso_obs/L412296/products/p0024076/26000501
NGC 4696A| P39| NLU | COLD_GAL| 03 | OLP_43 | /home/lu/iso_obs/L412296/products/p0024078/26000503
NGC 4696A_REF1| P37| NLU | COLD_GAL| 90 | OLP_43 | /home/lu/iso_obs/L412296/products/p0024080/26000590
NGC 4696A| P39| NLU | COLD_GAL| 92 | OLP_43 | /home/lu/iso_obs/L412296/products/p0024082/26000592
UGC 00014_REF| P37| NLU | COLD_GAL| 31 | OLP_52 | /home/lu/iso_obs/L421152/products/p0051945/39104931
NGC 4696A| P39| NLU | COLD_GAL| 03 | OLP_53 | /home/lu/iso_obs/L410888/products/p0064253/26000503
--------------------------------------------------------------------------------------------------------------------
Step 2. Fire up PIA
In one of your xterm window, simply type "pia" at the prompt to start up
your PIA session.
Hint: If you experience color problem after you fire up PIA, you
might be running Netscape. To fix this problem: exit both PIA and Netscape,
then fire up PIA before you fire up Netscape.
Step 3. Process the data following one of the checklists
The following three ckecklists are basic guides on how to process
the edited raw data (ERD) into a fomat equivalent to the pipeline AAR result
by removing instrumental effects. Simply click on the checklist appropriate
for your data and follow the step-to-step instructions.
Caution: These guides show only the very basic data reduction flow
with PIA, using all the default setups. They do not discuss many advanced
features in PIA and are usually not the best way to reduce your particular
data set. It is always a good idea to discuss with the available experts
at the workshop about how to optimize your data reduction.
Last update: Jan 1999