RadioastronomyInterestGroupFourthVirtualMeeting < IVOA

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---+ <span style="color: darkslategray;">Radio Astronomy Interest Group</span>
---+ Fourth Virtual Meeting 2022, March 7th/8th via zoom
---++ Telecon Agenda:

   * <span style="background-color: transparent;">LMT, Peter Teuben </span>
   * <span style="background-color: transparent;">GBT, Thomas Chamberlin/</span>
   * <span style="background-color: transparent;">Parkes, James Dempsey</span> 
   * <span style="background-color: transparent;">Italian radioastronomy archive, Alessandra Zanichelli</span>
   * <span style="background-color: transparent;">FAST data, Zheng Zheng</span>
   

---++ Minutes

---+++++ LMT

Peter Teuben:

50 m dish 1/3 mm waveband
many instruments : so spectra, 2D images, 3D spectral line cubes

raw data , calibrated data (netCDF or SDFITS)

Obscore for LMT

Make obscore tables for Level1-Level2 data and above (calibrated spectra, cubes, mosaics, ADMIT products).Hosted on dataverse (By the way : how does that fit for TAP services?)

Discussion:  questions about units for resolution (arcsec always we think, but need to check ALMA), frequency support (multiple spw per observation). A plan could be same obsid different obs_publisher_did for each spectral window


---+++++ GBO

Thomas Chamberlin (and Dave Frayer):

GBO data will be stored at new GBO data center and served through the NRAO archive access tool (AAT) (no VO yet for the AAT, is in the long-term plan).

up to 1 peta byte of data. PSRFITS and SDFITS (uncalibrated)

access through astroquery

Discussion: Databases :  DataVerse ? -> Postgresql

best way to ensure VO compatibility - make sure ObsCore information is present (can always write a mapping). Severin suggests start with a TAP service, the TAP layer can do the translation between observatory metadata and obscore (crosswalk).

---+++++ Parkes

James Dempsey described the current state of VO services from Australian radio projects - presents specs for CASDA VO services that can be placed on the IVOA RIG wiki (SDHF format).

This is it :  https://bitbucket.csiro.au/projects/CPDA/repos/sdhdf_test_data/browse/uwl_191208_055418.hdf

- Data (including recent ones) obtained with old Parkes receivers  are in RPFITS format. They do appear in ATOA ObsTAP services

- Data obtained with new  UWL receiver are stored in SDHF format (= an HDF5 Format using the SDFITS header structure) they are available on WEB UI at ATOA but not in ObscOre

Discussion : interest from other groups for SDHF format



---+++++ INAF radio archive

Alessandra Zanichelli describes the different observing modes (on/off, raster, flying scan, etc...) and the data structure. The data structure is made of table fits extension files  for subscans groupped in scan directories with summary headers for all the scan (no SDFITS)

Also question of mult feed receivers

hierarchichal view
                 -->  scan entity is relevant for ObsCore ?

Then Alessandra browsed the mandatory ObsCore parameters

some questions/issues on s_fov, s_region, s_resolution, t_tresolution, 

em_res_power not adapted ---> em_resolution

question of multiple spectral windows like LMT (see above)

Discussion : 
For different spectral windows: at waht part of raw data do people want to go ?
 is it OK to go back so deep .?
in science gateway ..how do we  articulate raw data / processed data ...

Do we describe spectral supports instead of splitting observations in several datasets ? --> may be difficult

---> this discussion had a follow up within the ESCAPE project

---+++++ FAST science cases and data

A presentation by Zheng :

FAST = 500 m Aperture Spherical radio telescope

5 field cabins 

science and data :

HI observation, HI absorbtion, FRB, pulsars, specral data

CRAFTS : (comensal survey) half of the sky

SDFITS format is used with specific additional keywords 

KY files have been developped (index files ???)

Dataset size is an issue for distribution
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Attachments

Topic attachments
I	Attachment	History	Action	Size	Date	Who	Comment
pdf	FAST_data.pdf	r1	manage	8711.0 K	2022-03-23 - 12:45	FrancoisBonnarel	FAST dat : science and format
pdf	INAF_SD-data-and-the-VO_v1.pdf	r1	manage	618.2 K	2022-03-22 - 14:34	FrancoisBonnarel	INAF Single dish data in the VO
pdf	LMT_data.pdf	r1	manage	152.4 K	2022-03-22 - 14:30	FrancoisBonnarel	Large Millimeter Telescope

Topic revision: r4 - 2022-03-23 - FrancoisBonnarel

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