[daip] [!4250]: aips - Writing FITS IDI with AIPS

[Eric Greisen]

Eric Greisen updated #4250
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       Staff (Owner): Eric Greisen (was: -- Unassigned --)
              Status: Closed (was: Open)
                 Due: - Cleared - (was: 17 January 2014 07:39 PM)

Writing FITS IDI with AIPS
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           Ticket ID: 4250
                 URL: https://help.nrao.edu/staff/index.php?/Tickets/Ticket/View/4250
           Full Name: Tracy Clarke
               Email: tracy.clarke at nrl.navy.mil
             Creator: User
          Department: AIPS Data Processing
       Staff (Owner): Eric Greisen
                Type: Issue
              Status: Closed
            Priority: Default
      Template Group: Default
             Created: 14 January 2014 07:39 PM
             Updated: 15 January 2014 12:44 AM



FITS IDI was really intended for the output of correlators.  It could 
be used for later stages but that was not the original intent.  In fact
until recently it really could not be used for processed data - but
now there are special keywords that allow the weights to be real
data weights rather than the fraction of the integration time that
was actually used for the particular sample.

You are correct that AIPS does not write FITS IDI.  The FITAB output
has many of the advantages of IDI, but without having to revise the 
data formats inside AIPS back into that convention.

I suppose, if I thought that various other packages could really read
FITS IDI and not other things the I could be talked into writing such
a task, but I am inclined not to.

Eric Greisen



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