[daip] VLANT

[Eric Greisen]

Lynn D. Matthews wrote:
> I understand what you're saying, but something still seems not right. 
> I'm re-reducing some data from May 2007.  When I ran VLANT in Oct. 2007, 
> it fixed 3 antennas and warned "6 more antennas may still get more 
> correction". When I ran it yesterday on the same data (nearly loaded 
> with FILLM) it updated only one antenna (a different one).

I have looked at the data files that apply to your run.  For the first 
(April 1) data set there are in fact no antennas that need correction. 
For the last one, antenna 21 has a correction entered May 16.  After 
that many antennas were moved to A array.  More antennas were moved in 
November and had corrections.  So in early November, you would have 
found a number of antennas not crossed off the future changes possible 
list that were crossed off by the end of November 2007.  There are 3 
however - 6, 9, 10 - which still have not appeared in the correction 
file and so VLANT is still looking for them to be at the stations you used.

It seems that VLANT is working fine - I think the analysts should put in 
0.0 when a station is moved and no correction to the assumed position is 
needed - there are pitfalls otherwise.

Eric Greisen