Facility and instrument terms in the different protocols

[Harrison Paul]

Hi,

In ProposalDM, I have been trialing the idea of a 4th layer which I have named “backend" for now - which is roughly how the detected data are combined to produce a data product - So in radio astronomy in particular the “instrument/detector” might be thought of as receiver/digitiser that is used for a particular frequency band, but then in interferometers in particular there might be several ways that same data streams from each telescope are combined - they could be cross-correlated, beam formed, or even just treated as independent, so there could be several simultaneous data products. It might be that this is not really a useful distinction and it is possible to have multiple “instruments” that are the possible combinations of the detector/backends.


Paul Harrison

> On 2022-04 -27, at 23:47, Matthew Graham <mjg at caltech.edu> wrote:
> 
> The organization overseeing/controlling the observation: ZTF Project
> The hardware/telescope: Palomar 48-inch telescope
> The instrument/detector: Zwicky Transient Facility
> 
>> On Apr 27, 2022, at 3:26 PM, Tim Jenness <tjenness at lsst.org> wrote:
>> 
>> 
>> 
>>> On Apr 27, 2022, at 15:17, CresitelloDittmar, Mark <mdittmar at cfa.harvard.edu> wrote:
>>> 
>>> 
>>> 
>>> The Dataset model uses a Party/Role relation to define the Facility itself.  This was a lean toward tie-in with Provenance, and while that may be overkill, it shows that this is definitely thinking of Facility as an Organization and not a piece of hardware.
>>> For space-based data, I can see 3 layers on this:
>>>  o The organization overseeing/controlling the observation (CXC Operations Center)
>>>  o The hardware/telescope (Chandra X-Ray Observatory)
>>>  o The instrument/detector (ACIS or HRC)
>>> 
>> 
>> Doesn’t ground-based data have the same three layers?  Rubin Observatory operates the Simonyi Telescope using the LSSTCam instrument. Similarly NOIRLab operating Gemini etc.
>> 
>> — 
>> Tim Jenness
>