Data Reduction for AGES using LIVEDATA and GRIDZILLA
This page is designed to complement the comprehensive AUDS Data
Reduction Instructions developed by Lister Staveley-Smith and Mark
The process for reducing AGES data is
identical to reducing AUDS
data, except that we use longer scans, so it is imperative to read
their instructions before proceeding.
Gridzilla and Livedata are distributed as part of the ATNF package of AIPS++. Originally when Mark
Calabretta set up a working version here at Arecibo it was only
available from the machine MOFONGO, so users had to ssh into MOFONGO
before being able to run them. There are steps being taken to make this
available to the whole NAIC network, but at the time of writing, some
work and some don't. To be on the safe side users are advised to
continue to use MOFONGO until further notice.
The AGES account has already been set up to run the most current
version of AIPS++ (v 1.9 Build 852) and it will tell you this
when you login as
AGES. To start LIVEDATA type:
The GUI has changed slightly since the AUDS Data Reduction webpage was
written (see the screenshot below). The main difference is that the
ALFA configuration is now called AUDS. The AUDS observing
technique is similar enough to our mapping
technique that the same reduction techniques can be applied.
CAUTION: The LIVEDATA display uses over 768 lines
on your display and is NOT resizable. In order to display LIVEDATA
properly you will need to make sure that your display can handle at
least 1000 lines and is set up to do so.
All raw data resides in the /share/pservfer.sda3/wappdata
directory. So set the 'Read directory' to this. A file filter can be
applied to isolate all the AGES files by setting it to *a1961*. BEWARE
THAT THE LEAPFROG AND ZOA OBSERVATIONS ALSO SHARE THIS PROJECT ID SO BE
SURE TO KNOW WHICH FILES YOU'RE GOING TO PROCESS.
All processed data are stored in the /share/ages/drift_files
directory under the appropriately dated directory. If the dated directory does not exist you
will have to create it. So set the 'Write directory' to be /share/ages/drift_files/DATE (where
is replaced by the date of the observations, e.g. 20041125 for Nov 25th
2004. Livedata outputs SDFITS format files which can then be gridded
To accommodate our longer scans the 'Max Cycles' box and 'Box Size'
both need to be set so that they are AT LEAST as big as your scan
period, measured in integrations. The conversion is simplified by the
fact that we are integrating every second. We are performing 1200
second scans, so as you can see 'Max Cycles' and 'Box Size' have been
set to 1220.
Once LIVEDATA has reduced all the files you are ready for GRIDZILLA.
This page was written and is
maintained by Robbie Auld.
Page was last updated on 28/11/2004