[daip] combine GMRT and ATCA data

[Eric Greisen]

On 12/28/2016 08:33 AM, Jota S. wrote:
> Dear Eric,
>
> I have attached both header (I have realised that the coordenates are
> missing in one of them). I am reading the AIPS help file for SPECR now.
>
> I tried to use CASA but a different problem come up. It said that Tsys
> is missing and it can't determine de rms in image process.

There are a variety of issues here

1. The first UV data set is a multiple source data set - try SPLIT to 
select the one source in the other data set.

2. The second data set has the frequency axis going in the opposite 
direction and its channels are about but not exactly twice as wide

3. Also the GMRT is circular polarization (STOKES -1, -2) and the ATCA 
is linear (STOKES -5, -6)

Are you doing continuum or spectral line observations?  In either case, 
use STOKES='I' with each to make the same polarization.  SPLIT will also 
average channels so you can make channels twice as wide from the first - 
so close to the second - quite simply.  task BLOAT will make a data set 
with more channels (new ones flagged) to get back to 512.  Task SPECR 
may also make the channelization of the two look similar.  Perhaps the 
task you need is UVFRE which tries to make one data set look like 
another.  First SPLIT to make I polarization and single source.  Then 
you can try to make the first look like the second or vice versa and 
then DBCON might work.

Eric Greisen