[daip] [!5346]: aips - VLA14B-292 Computer Processing Time question

[Eric Greisen]

Eric Greisen updated #5346
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       Staff (Owner): Emmanuel Momjian (was: -- Unassigned --)
                 Due: - Cleared - (was: 15 August 2014 09:41 PM)

VLA14B-292 Computer Processing Time question
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           Ticket ID: 5346
                 URL: https://help.nrao.edu/staff/index.php?/Tickets/Ticket/View/5346
           Full Name: Robert H Gray
               Email: roberthansengray at gmail.com
             Creator: User
          Department: AIPS Data Processing
       Staff (Owner): Emmanuel Momjian
                Type: Issue
              Status: Response Overdue
            Priority: Default
                 SLA: NRAO E2E
      Template Group: Default
             Created: 11 August 2014 09:33 PM
             Updated: 14 August 2014 07:35 PM
      Resolution Due: 21 August 2014 09:41 PM (7d 2h 5m)



I have passed on this query to someone experienced in reducing actual data
but will add some of my thoughts first.

Do not worry about SAD - that is relatively fast but is not spectral-line oriented.
AIPS also has a task SERCH which is designed to find line signals in large
cubes.  It does not fitting beyond matched filtering, but leave you with lots of
info from which to do fitting.  In fact, XGAUS may be what you want with a
spectral line project.

A 10 gigabyte data set is relatively modest by modern standards and should
process reasonably quickly.  The time required depends critically on whether
you accept a CASA pipeline quality output or want to work harder on the
calibration.  Imaging 8K channels will also take some time, but line imaging
is rather faster than continuum and much less demanding.  AIPS has a
procedure called LINIMAGE to help with the I/O aspects of this.

Eric Greisen



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