Facilities and Instruments Description frameworkDescribing Facilities, Telescopes and InstrumentsThis 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 | ||||||||
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< < | - keywords verifications in data sets serialisation | |||||||
> > | For a precise and efficient tracking of the origin of metadata, we need to track details on instruments and facilities used for the data acquisition especilly because it uses nowadays, various regimes and modes to combine observations for a scientific purpose. | |||||||
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< < | - 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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> > | This page records some of the existing initiatives on the topic | |||||||
UseCasesUse Cases for Facilities descriptionDiscussion for a description schemafrom 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. 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). Use cases exposed above may have 3 levels of usage for instruments/ telecope parameters:
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< < | Missions/ Telescopes X | |||||||
> > | Example of Usage : Missions/ Telescopes X Time line ( Mihaela Buga , CDS) | |||||||
-----------------------------------------------------------------------------------------------> 1978 1981 1883 1986 1990 1993 1995 1996 1999 2001 2002 2004 2011 Einstein EXOSAT | | Beppo SAX('96-'02) | SWIFT (2004-ongoing?) BBXRT | INTEGRAL(2002-ongoing) | |-----------------------| | ASCA(1993-2001) | |----------------------------------------------------------| | RXTE(1995-2011) |-----------------------| Rosat (1990-1999) | Chandra(1999-ongoing) XMM-Netwon : EPIC, MOS/PM, RGS (1999-ongoing) | ||||||||
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< < | Example of Mihaela schema for observation dates of X-ray missions. | |||||||
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< < | She made the same kind of diagram for the wavelengths: | |||||||
> > | Filter names spread along the wavelentgh axis ( Mihaela Buga , CDS) | |||||||
3000A 4000A 5000A 6000A 7000A 8000A 9000A 10000A 300nm 400nm 500nm 600nm 700nm 800nm 900nm 1µm 1.2µm 1.6µm 2.1µm ---------------------------------------------------------------------------------------------------------> U u g B V r R i I z J H K filtres Simbad B=F435W V=F555W r=F625W i=F775W z=F850LP J=F110W H=F160W filtres HST g=F475W I=F814W filtres HST ___________________________ ____________________________________ | | | | 0.01nm 10nm 380nm(3800A) 700nm(7000A) 1µm 2.5µm 30µm 300µm 1mm/300GHz 1cm/30GHz 1m/ 300MHz longueur d'onde --------|--------|----------|----------------------------|-------|-----|-----|---------|-----------|---------|----------------> Gam X UV Opt NIR MIR FIR smm mm micro-onde -------------Rad---->It shows that by having a centralised description of telescopes/instruments and the physical features of spectral range or operationnal periods, the discoverability of specific observations is facilitated. | ||||||||
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> > | First attempt in the IVOA Framework ( 2015) | |||||||
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> > | At the ADASS conference in 2015 , we presented a first Model to describe Facilities, Telescopes, space missions , instruments , by gathering properties and reusing the VOREsource schema defined in the IVOA . see the poster attached for a simple overview http://wiki.ivoa.net/internal/IVOA/UniFacil/ADASS2015-VOFacilities-posterv6.pdf | |||||||
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