Facility and instrument terms in the different protocols
Tamara Civera
tcivera at cefca.es
Wed Apr 27 18:57:23 CEST 2022
Dear DAL, Registry,
I am writing to you due to the definitions of the terms/fields
"facility" and "instrument" used in the different protocols Obscore,
SIAP v 2.0 and VoDataService. I have found that the current ones can
cause confusion, especially the "facility" term (I send attached a
"facility_name" list from different Observatories Obscore services and
in some, this field contains the observatory name, in other the
telescope name,...). So I propose to clarify and unify them in these
protocols.
Current "Facility" definition according to the different VO protocols
documentation:
* Obscore "Facility" definition:
o "B7.1 The Facility class codes information about the observatory
or facility used to collect the data."
o "C.3
<FIELDname="facility_name"datatype="char"ucd="meta.id;instr.tel"utype="obscore:Provenance.ObsConfig.Facility.name"xtype="adql:VARCHAR"arraysize="128*"><DESCRIPTION>telescope
name</DESCRIPTION></FIELD>"
* SIAP 2.0 "Facility" definition: "2.1.12 The FACILITY parameter is a
string-valued parameter that specifies the name of the facility
(usually telescope) where the data was acquired. The value is
compared with the facility_name from the ObsCore [7] data model"
* VoDataService "Facility" definition: "3.1.1 The observatory or
facility used to collect the data contained or managed by this
resource."
Current "Instrument" definition according to the different VO protocols
documentation:
* Obscore "Instrument" definition: "B7.2 The name of the instrument
used for the acquisition of the observation."
* SIAP 2.0 "Instrument" definition: "2.1.13 The INSTRUMENT parameter
is a string-valued parameter that specifies the name of the
instrument with which the data was acquired. The value is compared
with the instrument_name from the ObsCore [7] data model."
* VoDataService "Instrument" definition: "3.1.1 The instrument used to
collect the data contain or managed by a resource."
After discussing this topic with Markus Demleitner in the IVOA
Interoperability Meeting, we have thought these possible definitions for
facility and instrument:
"Facility" should contain the name of the device that collected the
messenger particles (as opposed to the detector, which is in
"instrument"). In the optical, this would usually designate a
telescope, in the radio, it would be a dish or an array, for space
missions, usually the whole probe.
"Instrument" should contain the name of the device used for analysing
and detecting the messenger particles. Instances of such devices would
include cameras, spectrographs, or particle detectors.
Thanks,
Tamara Civera
--
Tamara Civera Lorenzo
Scientific Database and Web Access Engineer
Logotipo CEFCA *Centro de Estudios de Física del Cosmos de Aragón*
* Plaza San Juan nº 1, piso 2º
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* Email: tcivera at cefca.es <mailto:tcivera at cefca.es>
* Url: http://www.cefca.es <http://www.cefca.es>
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