Lightcurve datamodel?

[CresitelloDittmar, Mark]

Kelle,

Regarding the issue you posted on the ObsCoreTimeExtension repo.
   https://github.com/ivoa-std/ObscoreTimeExtension/issues/8

I thought you might hit this problem since you're looking for standard FITS
keywords for your lightcurves.
The ObsCore standard (and extensions) are targeted toward Data Discovery
threads, which pass the information around in VOTables annotated with
UTypes.
As such, that probably isn't a good place to put corresponding FITS
keywords.

There are very few models targeting Data Products, and even there, I think
only Spectrum includes FITS serialization specs.  In general, the data
models should be independent of serialization standards, and that is the
direction we have been moving towards in the newer, vo-dml compliant models.

It sounds like what you are looking for is a mapping from the ObsCore (and
extension) UTypes to a VO recommended FITS keyword.. which I don't believe
exists other than what is defined in Spectrum.  Or perhaps preferably a
FITS serialization standard which maps model concepts to FITS key/column
specs... which certainly doesn't exist in the VO.

I think the idea has been:
  * Everybody uses different FITS keywords to serialize their data
  * We need to standardize something for Data Discovery that doesn't force
everyone to recast their FITS files
  * So we'll communicate in VOTable and tag the concepts with UTypes
      + data providers can then map their individual keywords to the
ObsCore standard UTypes.

I'm afraid this isn't a very encouraging email.. I'm not sure what to
recommend for you.
Anyone.. Please correct me if I've missed a resource that would be helpful
here.

Mark





On Wed, Jun 12, 2024 at 8:28 AM Kelle Cruz via dm <dm at ivoa.net> wrote:

> This document has what I’m looking for!  Thanks everyone.
>
>
> https://github.com/ivoa-std/ObscoreTimeExtension/blob/master/ObscoreTimeExtension.pdf
>
> kelle (via iOS)
>
>
> On Wed, Jun 12, 2024 at 3:59 AM BONNAREL FRANCOIS <
> francois.bonnarel at astro.unistra.fr> wrote:
>
>> Hi,
>>
>> Ada and I wrote in parallel, but we are pointing to the same IVOA note !
>>
>> Best regards
>>
>> François
>>
>> Le 12/06/2024 à 09:57, NEBOT GOMEZ-MORAN Ada (OBS) via dm a écrit :
>> > Hi Kelle,
>> >
>> > we wrote this note some time ago:
>> >
>> >
>> https://www.ivoa.net/documents/Notes/LightCurveTimeSeries/20231122/TimeSeries.pdf
>> >
>> > but it didn’t get much attention so I haven’t made any effort on making
>> improvements / changes to it for some time.
>> >
>> > Let me know if this goes in the lines of your needs!
>> >
>> > Cheers,
>> > Ada
>> >
>> > ----- Mail d’origine -----
>> > De: Kelle Cruz via dm <dm at ivoa.net>
>> > À: dm at ivoa.net
>> > Envoyé: Tue, 11 Jun 2024 22:34:39 +0200 (CEST)
>> > Objet: Lightcurve datamodel?
>> >
>> > Hi folks,
>> >
>> > I'm working on wrangling some lightcurves into a "standard" format. is
>> > there a good reference document for a lightcurve datamodel? At this
>> point,
>> > I'm mostly just interested in header keywords.
>> >
>> > Thanks,
>> > Kelle
>> >
>> > --
>> > Kelle Cruz, PhD (she/her, they/them)
>> > Assoc. Professor, Physics and Astronomy, Hunter College
>> > CEO, ScienceBetter Consulting, LLC
>> > CFO, Startorialist, Inc. <http://shop.startorialist.com>
>> > Editor-in-Chief, AstroBetter Blog and Wiki <http://astrobetter.com>
>> > Research Associate, American Museum of Natural History
>> > Visiting Scholar, Flatiron Institute
>> >
>>
>
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