[evla-sw-discuss] Reference pointing

[Barry Clark]

Ah, I understand.  That case was what the 'copy' variants was for.

z = subarray.refPointingInit()
subarray.setRefPointing(z)
<X band pointing scan>
refpointingAgent.register(z)
<short dummy scan to wait for results>
<pointing scan at K band>
w = subarray.refPointingInit(z)    # copies X band offsets
refPointingAgent.register(z)
<K band target obsn>
subarry.setRefPointing(w)
<pointing scan at Q band>
refpointingAgent.register(w)
<Q band target obsn>
etc.

> From evla-sw-discuss-bounces at donar.cv.nrao.edu  Mon Apr 11 15:53:25 2005
> Return-Path: <evla-sw-discuss-bounces at donar.cv.nrao.edu>
> Date: Mon, 11 Apr 2005 15:52:58 -0600
> From: Bryan Butler <bbutler at nrao.edu>
> 
> 
> the use case your example doesn't handle, that mine does (i think, 
> anyway), is observing at K & Q-bands, and double reference pointing at 
> both (with, say, X-band as the lower band).  i believe that the way your 
> example would work, you would need to do the X-band reference pointing 
> scan twice.  in mine, you just do one each at X-, K-, and Q-bands, and 
> then apply either X+K or X+Q, depending on the target frequency.  this 
> is, for instance, how rick and i do the double reference pointing during 
> the flux density runs (well, kind of, but the concept is the same).
> 
> it just seems simpler to me to not add up the offsets into a single 
> object - keep them separate and apply whichever ones you wish at the 
> time you observe your targets.
> 
> i wasn't thinking of the on-the-fly collimation determination, though 
> it's an interesting idea.
> 
> 	-bryan
>