Date: Wed, 09 Jul 2008 14:39:06 -0700
From: Sam Freeland <freeland@lmsal.com>
To: Loren W. Acton <acton@mithra.physics.montana.edu>, jkm@overhome.net, lemen@lmsal.com
Cc: mckenzie@mithra.physics.montana.edu, takeda@mithra.physics.montana.edu,
    freeland@lmsal.com
Subject: Re: HIS.ARCSEC_SHIFT

Hi Loren,

While these tag definitions are "often" described in the FCD, the
source of tag definitions are in the software - specifically,
the $SSW/yohkoh/gen/idl/ref_access/*.inc files include tag by tag
documentation (albeit, not always exhaustive/obvious descriptions..)-
these *inc files provided the input in FCD generation.

for the arcsec_shift example:
[ssw1:~] freeland% grep -i arcsec_shift $SSW/yohkoh/gen/idl/ref_access/*inc
/net/solserv/data1/dynamo/ssw//yohkoh/gen/idl/ref_access/sxt_struct.inc: 
       real*4 arcsec_shift(2) !   - Relative shift.  The number of 
arcseconds that the image was shifted by

re: software where the values are assigned...
[ssw1:~] freeland% grep -i ARCSEC_SHIFT $SSW/yohkoh/sxt/idl/atest/*pro
/net/solserv/data1/dynamo/ssw//yohkoh/sxt/idl/atest/align1img.pro:;V1.01 
     19-Nov-93 (MDM) - Corrected logging of ARCSEC_SHIFT.  It was not
/net/solserv/data1/dynamo/ssw//yohkoh/sxt/idl/atest/align1img.pro:his_index, index, 0,
'arcsec_shift', [-xoffset, -yoffset]*gt_pix_size()*pixout 
             ;MDM added *pixout 19-Nov-93

e.g. see align1img.pro for implementation details

Regards,
Sam.
--------
On Wed,  9 Jul 2008 15:10:57 -0600 (MDT)
 acton@mithra.physics.montana.edu (Loren W. Acton) wrote:
> Hello,
> 
> Can one of you gentlemen tell me what the SXT
> index tag .HIS.ARCSEC_SHIFT contains?
> 
> I'm having a rough time figuring out some of
> the index tags.  Is there a definition document
> of some sort somewhere?
> 
> Thanks for your help,
> 
> Loren