[Difx-users] How to read difx2fits output

[Adam Deller]

OK, it is up at
https://gist.github.com/adamdeller/9e29c776612dfe448ce018c04c532ab5.  I
suspect Harro's tool will be easier, but give it a go if you like.

Cheers,
Adam

On Mon, 30 Aug 2021 at 11:29, Rebecca Lin <lin at astro.utoronto.ca> wrote:

> Hi Adam and Harro,
>
> Adam: It may be useful to take a look at your  fits_compare.py script if
> it's not too much trouble for you to put it on github. I can try to see if
> it works with the helper functions.
>
> Harro: Thanks, I'll give this a try!
>
> Cheers,
>   Rebecca
>
>
> On Sun, 29 Aug 2021 at 08:23, harro verkouter <hverkouter at gmail.com>
> wrote:
>
>> Hi all,
>>
>> For the verification of sfxc postprocessingtools (to generate e.g.
>> FITS-IDI files) we have a comparisontool for the meta-data. The one for
>> numerical equivalence of two FITS-IDI files is currently lacking (it does
>> work for MeasurementSets):
>>
>> https://code.jive.eu/verkout/jive-toolchain-verify
>>
>> Specifically look at the ‘compare-ms-idi-meta.py’ script. Despite it’s
>> name it can compare any number of FITS-IDI and/or MeasurementSet files -
>> including zero of either 😄
>>
>> Cheers,
>> h
>>
>> Op zo 29 aug. 2021 om 10:17 schreef Adam Deller via Difx-users <
>> difx-users at listmgr.nrao.edu>
>>
>>> Hi Rebecca,
>>>
>>> I have a script called fits_compare.py that diff's two FITS-IDI files
>>> that are supposed to be identical (i.e., same antennas, integration time,
>>> etc).  It was always a bit of hack/check code and is probably not very user
>>> friendly.  If you want I can put it on github so you can get it - it also
>>> has a dependency on some helper functions that are available in
>>> https://github.com/dingswin/psrvlbireduce/, but there's every chance
>>> that it won't work out of the box and I don't have any time to debug it at
>>> the moment.  But let me know if you'd like me to make it available and try
>>> investigating it.
>>>
>>> Cheers,
>>> Adam
>>>
>>> On Sun, 29 Aug 2021 at 07:57, Rebecca Lin via Difx-users <
>>> difx-users at listmgr.nrao.edu> wrote:
>>>
>>>> Hi Leonid,
>>>>
>>>> Thanks for pointing me to the documentation! I'm hoping to compare
>>>> visibilities from my correlation pipeline to the output from DiFX.
>>>>
>>>> Best,
>>>>   Rebecca
>>>>
>>>> On Sat, 28 Aug 2021 at 13:16, Leonid Petrov <Leonid.Petrov at lpetrov.net>
>>>> wrote:
>>>>
>>>>> Rebeca,
>>>>>
>>>>> > I'm wondering if there is documentation on how information is stored
>>>>> in the
>>>>> > fits file
>>>>>
>>>>>   Sure:
>>>>>
>>>>> ftp://ftp.aoc.nrao.edu/pub/software/aips/TEXT/PUBL/AIPSMEM114.PDF
>>>>>
>>>>> > and how to plot the visibilities.
>>>>>
>>>>>   Usually, these plots are useless. There are exceptions, but
>>>>> generally,
>>>>> you need process the data first to see any signal. You can develop your
>>>>> own software for visibility analysis or try to use existing packages,
>>>>> whichever you prefer. But it is not easy. Depending on the problem,
>>>>> mastering data analysis may take from months (though this sounds
>>>>> very optimistic) till ... all your life. Good luck.
>>>>>
>>>>> > I'm mainly wondering where the
>>>>> > complex visibilities are stored in the fits file.
>>>>>
>>>>>   In section UV_DATA. See AIPSMEM114.PDF for details.
>>>>>
>>>>> Leonid
>>>>> 2021.08.28_13:09:41
>>>>>
>>>> _______________________________________________
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>>>>
>>>
>>>
>>> --
>>> !=============================================================!
>>> A/Prof. Adam Deller
>>> ARC Future Fellow
>>> Centre for Astrophysics & Supercomputing
>>> Swinburne University of Technology
>>> John St, Hawthorn VIC 3122 Australia
>>> phone: +61 3 9214 5307
>>> fax: +61 3 9214 8797
>>>
>>> office days (usually): Mon-Thu
>>> !=============================================================!
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>>

-- 
!=============================================================!
A/Prof. Adam Deller
ARC Future Fellow
Centre for Astrophysics & Supercomputing
Swinburne University of Technology
John St, Hawthorn VIC 3122 Australia
phone: +61 3 9214 5307
fax: +61 3 9214 8797

office days (usually): Mon-Thu
!=============================================================!
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