Facilities and Instruments Description framework
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
ExistingInit
Use Cases for Facilities description
Discussion for a description schema
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.
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:
- 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.
Missions/ Telescopes X
----------------------------------------------------------------------------------------------->
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)
Example of Mihaela schema for observation dates of X-ray missions.
She made the same kind of diagram for the wavelengths:
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.
<!--
* Set ALLOWTOPICRENAME =
TWikiAdminGroup-->