Difference: UniFacil (9 vs. 10)

Revision 102017-02-22 - MireilleLouys

 
META TOPICPARENT name="IvoaSemantics"
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Describing Facilities, Telescopes and Instruments in common framework

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Facilities and Instruments Description framework

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Describing Facilities, Telescopes and Instruments

  This is a common effort initiated in the Semantics working group, namely with suggestions from Planetary science services at Paris Obseervatory and collaborators.

The idea is to identify and gather needs for a homogeneized description and identification of instruments, telescopes, space missions, space crafts, etc. and create a maintained repository of identifiers re-usable by the community for

- keywords verifications in data sets serialisation

- data citation

- facilicity citations tracing

etc...

Context: "science questions drive the need for multi-lambda, multi-messenger observations" (Mark Allen, HCERES). Discoverability of observations would be improved.

Existing Initiatives

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For specific scientific domains:

 
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Initiative from VESPA for planetology - Baptiste Cecconi
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ExistingInit
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UseCases

 
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VESPA observatory facility database: https://voparis-confluence.obspm.fr/display/VES/Observatory+Facility+Database
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Use Cases for Facilities description
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Discussion for a description schema

 
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span dates needed...
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from the usage exposed , we see the facilities and instruments need to be standardized (name , ids ) together with physical features such as spectral range, operational period, field of view, spatial resolution, mode, etc.
 
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WISeREP (Weizmann Interactive Supernova data REPository) - Yaron et Gal-Yam ( 2012PASP..124..668Y):
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Nominal feature values for instruments can be used in various services, when the information attached to a dataset ( associated data , catalog , etc) is not available).
 
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http://wiserep.weizmann.ac.il

Database for supernovae providing (among other things) a list of 110 telescopes with latitude/longitude, elevation, diameter, URL and location.

Seems to be updated by the community.

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Use cases exposed above may have 3 levels of usage for instruments/ telecope parameters:
  • precise : theses are the exact parameters for a specific observation
  • intermediate: the usual values ex spectral coverage , recorded for a data collection ( ex 2MASS J --> fits the range of filter J.
    This applies when fluxes have been converted to a different photometric system than the original instrumental one
  • global : when no other info is provided for the spectral range of a data set, the min and max spectral range of the instrument can be used.
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For agencies:

ESO Telescope Bibliography (TelBib) - (Head librarian: Uta Grothkopf):

http://telbib.eso.org

Purpose: Track the publications that use data from ESO’s telescopes and instruments.

A publication is linked to diverse program ID (registry of a set of observation with a defined Program ID nomenclature).

The program ID gives a series of dasetID = observing runs

1 progID for many nights of observations.

1 progID for diverse instruments (for instance UVES and PIONNEER)

A proposal is more general and gives the purpose of different observations.

List of NOAO (National Optical Astronomy Observatory) facilities for 2017A :

https://www.noao.edu/noaoprop/help/facilities.html#list

The MPC observatories list ("official" observatory codes):

http://www.cfa.harvard.edu/iau/lists/ObsCodes.html, on the VO as ivo://org.gavo.dc/obscode/q/query

For publications:

American Astronomical Society (AAS) journal (chief scientific editor: Greg Schwarz - with Gus Muench):

"The AAS created a set of facility keywords about 12 years ago to help librarians and agencies track which facilities where used. The list has grown in that time and now contains almost 500 facilities. You can view them via this interface:

http://journals.aas.org/authors/aastex/facility.html

It does get used by a few authors (~10-20%) but it is not mandatory. It also only applies to the AAS Journals so its adoption is not widespread. Another issues that might be important to you is that we do not have a vocabulary for instruments as we thought that would be too hard to track and monitor. The facility keyword is controlled but we let the author put in whatever they want for the instrument.

Plans for the future are 1) to have the Unified Astronomy Thesaurus (UAT) folks integrate the list into the Thesaurus and 2) a pilot program to semantically identify facilities in AAS articles during production and then have the author approve/change the results during proofs. We are hopeful that this last option will greatly increase the tagging of facilities in our journals."

Tag examples :
\facilities{KAIT}, \facility{Magellan:Baade (LDSS2 imaging spectrograph, Boller \& Chivens spectrograph)}, \facility{Magellan:Clay (LDSS2 imaging spectrograph)}, \facility{Swope (SITe No. 3 imaging CCD, NICMOS3 array)}, \facility{Du Pont (Tek No. 5 imaging CCD, WFCCD)}, \facility{Mayall (MOSAIC-1 wide-field camera)}, \facility{MMT (Blue Channel spectrograph)}, \facility{FLWO:1.5m (FAST)}, \facility{Shane (Kast Double spectrograph)}, \facility{Keck:I (LRIS)}, \facility{Keck:II (ESI)}

Keywords are given in the online table but the whole expression in {} is not controlled.

For A&A, relationship with the CDS to publish data but nothing about how facilities must be cited:

"Whenever the primary observational data (e.g., the spectrograms that were used for determining radial velocities or redshifts) are archived at a facility such as ESO or HST and therefore publicly available, there is no need for authors to provide them to A&A; in this case, we'll archive only the reduced data (i.e., the radial velocities and the reduced photometric data in the examples given above). When primary data presented in articles are not publicly available through an institutional archive (e.g., the IRAM spectroscopic data), the calibrated data will be archived at the CDS." from http://www.aanda.org/author-information

Others

Applications for telescope time

JKT's list of available optical/infrared telescopes to UK astronomers (personal page of John Taylor?):

http://www.astro.keele.ac.uk/jkt/telescopes.html

"This is a list and basic details of the ground-based optical and infrared observing facilities which accept applications for telescope time from UK astronomers."

The classification is oriented to select instruments for dedicated observation.

provides the physical features : spectral coverage , spatial resolution , field of view

and classify all instruments following the site-telescope-instrument hierarchy.

According to type of telescopes and spectral domains:

On Wikipedia : lists of optical telescopes, solar telescopes, radio telescopes, large optical telescopes, space telescopes, largest optical telescopes in the continental United States, infrared telescopes, refracting telescopes, largest optical refracting telescopes, largest infrared telescopes, astronomical observatories, X-ray space telescopes, proposed space observatories...

MAST (The Mikulski Archive for Space Telescopes): More than a list. Implies log archive...

http://archive.stsci.edu/

MAST is a NASA funded project to support and provide to the astronomical community a variety of astronomical data archives, with the primary focus on scientifically related data sets in the optical, ultraviolet, and near-infrared parts of the spectrum.) List of missions.

Use-cases

CDS usages for SIMBAD - (documentalist: Mihaela Buga):

In order to add wavelenghts and quality of the coordinates of the astronomical objects that we record in SIMBAD we need to know with which instruments the astronomical objects of a publication are observed and from where the coordinates given in the paper are taken. An astronomer can give the approximate resolution of an instrument (that we traduce in SIMBAD by a quality letter: A=nice quality, E=very poor quality, etc.) and we can also indicate in which domain-range the position is given (Optical, Gamma, NIR, smm, FIR, Radio)...

In order to keep a track of the questions ask to astronomers and of telescopes/instruments found in the litterature, an internal list has been created on a TWiki.

Currently, it lists ~75 telescopes/missions: http://cds.u-strasbg.fr/twiki/bin/view/Ressources/CoordLambdaQualite1#ListMis

We have telescopes, instruments, wavelength domains, URLs toward the telescope site and Wikipedia and notes from astronomers concerning the quality of astrometry.

CDS usages for VizieR - (documentalist: Emmanuelle Perret, Sylvain Guéhenneux, Patricia Vannier et Marianne Brouty):

1. Description of measurements from tables in publications implies a section "Description" in a ReadMe file describing the observations: telescope/instrument and its location, date of observations are mandatory. If possible, wavelength range and resolution are also given (useful for SIMBAD).

2. Photometry from tables is used for the service called "Photometry viewer", it converts magnitudes in fluxes when possible and gather all the fluxes around a position to trace the spectral energy distribution (SED) of an object (if the search around the position only gives one object)...

See also recent presentation by Gilles Landais at Trieste Interop 2016:

http://cds.u-strasbg.fr/~landais/presentations/IVOA_2016Trieste_Photometry_VizieR.pdf

In order to do so, we attribute filters to the measurements which are gathered in an internal table:

http://vizier.u-strasbg.fr/viz-bin/VizieR-2?-source=METAfilter

System of photometry is important and in that case, we go up to the precise filter with effective wavelength and width of the filter.

All the filters from the SVO (http://svo2.cab.inta-csic.es/theory/fps/) have been included in this table.

3. Associated data (Gilles Landais) : help to astronomers for indexation of their FITS files : extraction from headers FITS (TEL_ID, DATE... ?)

help to documentalists for indexation of the FITS files : a list of telescopes allows to select an instrument - built along the indexations.

Currently, there is a minimum spectral range and a maximum spectral range but it could be very accurate (if the header is filled) or only give the minimum-maximum range of an instrument (see the dictionnary in Saada - created by Laurent Michel).

Purpose: database (http://cdsarc.u-strasbg.fr/assocdata/) searchable by observation date, spectral bands, coordinates in time series, spectra, images associated to publications.

See also the presentatio nby Gilles Landais at PREDON in november 2016 :

http://cds.u-strasbg.fr/~landais/presentations/PREDON2016_curationVizieR.pdf

CDS usages for the Dictionary of Nomenclature - (documentalist: Marianne Brouty & Fabienne Woelfel):

When the publication is linked to specific observations, the facility is described along with the acronym created for the paper.

For instance, see section Note for http://cds.u-strasbg.fr/cgi-bin/Dic-Simbad?/3104709

CDS usages for the HiPS in Aladin - (documentalist: Mihaela Buga ):

Diverse metadata are used to index the HiPS (Hierarchical Progressive Surveys) in Aladin.

In properties of HiPS, "obs_description" contain the telescope name and can contain the instrument in some cases.

All properties of HiPS: http://alasky.unistra.fr/MocServer/query?hips_service_url=*&dataproduct_type=!catalog&dataproduct_type=!cube&get=record

Currently we use a simple acronym, but a unique id would be better (pid=persistent ID) because it will link to the VO registry with a basic description and the URL toward the instrument archives from the agencies.

Keywords assessment for bibliographic citation

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