A VO-driven
Astronomical Data Grid in China
Chenzhou CUI
Boliang HE, Yang YANG, Yongheng ZHAO
China-VO, National Astronomical Observatories, CAS

Oct. 16, 2008

ADASS2009, Oct. 5-9, 2009, Sapporo, Japan

Chenzhou CUILAMOSTLarge Sky Area Multi-Object Fiber Spectroscopic Telescope Started in 1997
 First light for engineering in August 2008
 Hardware construction finished in June 2009
 Under calibration and commission currently

ADASS2009, Oct. 5-9, 2009, Sapporo, Japan

Chenzhou CUI

MA: 24 sub-mirrors

MB: 37 sub-mirrors

ADASS2009, Oct. 5-9, 2009, Sapporo, Japan

Chenzhou CUI

Characteristics of LAMOST• Effective aperture

3.6-4.9 meter• FOV5 (1.75m linear)4000• Number of optical fiber• Observing sky area
• Spectral resolution• Survey capability-10    +90
1-0.25nm
taking spectral resolution 1nm,
integration time 1.5 hours,
magnitude limit: 20.5m
3.30 arcsec (320 macro linear)• Size of fiber• Site seeing: ~2 arcsec

ADASS2009, Oct. 5-9, 2009, Sapporo, Japan

Chenzhou CUIInstruments
 4000 Fibers (130km)
 4000 Fiber positioning units 16 Spectrographs
 250 fibers per spectrograph 32 4k x 4k CCD Cameras

RL = 1000/2000
RM= 5000/10000ADASS2009, Oct. 5-9, 2009, Sapporo, Japan

Chenzhou CUIADASS2009, Oct. 5-9, 2009, Sapporo, Japan

Chenzhou CUI

Spectroscopic Surveys
 Key projects include
 extra-Galactic Milky Way cross-identification

 SWG for the Milky Way study SWG for extragalactic survey

ADASS2009, Oct. 5-9, 2009, Sapporo, Japan

Chenzhou CUILAMOST Obs. Mode and Data Size
4000 / 250 => 16 spectroscopes => red & blue parts =>32CCD cameras => 4K*4K pixels => 16 bits color deep For each sky area, 3 times exposure, 30 minutes each. 5 sky area(plate) can be observed for a night (7.5~9 hours) Scientific data per night:

4K*4K*2*32*5*3= 15.36 (GB)All the collected data is about 20 GB/night 20*200= 4,000 GB per year (ideal condition)
 4*5 year = 20 TB for the LAMOST 5 years life periodThe whole archive is about 50 to 60TBADASS2009, Oct. 5-9, 2009, Sapporo, JapanChenzhou CUI

Data Products
 Level 1: 2-D multi-fiber spectrum images(private)
 Level 2: 1-D spectra (to the public 18 monthslater)
 Level 3: Catalogs (to the public 24 months later)and value-added products

ADASS2009, Oct. 5-9, 2009, Sapporo, Japan

Chenzhou CUILAMOST Dataflow

ADASS2009, Oct. 5-9, 2009, Sapporo, Japan

Chenzhou CUI

Undergoing projects in China
40-50m radio telescopes

AST3

CSTAR

YNAO 2.4m

SHAO 65m

FAST

HXMT

21CMA

ADASS2009, Oct. 5-9, 2009, Sapporo, Japan

Chenzhou CUIThe way to standardization andcollectivization VO: the latest stage of along term trend towards

standardization and collectivization in astronomy
 The first key step was the development of "facility class

instrumentation".
 The next step was the standardization of data formats - FITS,NDF, etc.
 Rapidly following on this was the production of "facilityclass" data reduction software - IRAF, MIDAS, Starlink,
AIPS etc.
 The VO is the next step in that process - standardizing data
access methods, data exchange formats, and metadata.
 Finally, a logical next step is the standardization of data
analysis tools.

-- Andy Lawrence: Drowning in Data : VO to the rescue

ADASS2009, Oct. 5-9, 2009, Sapporo, Japan

Chenzhou CUI

We are at the starting point >>>Requirements for astro-informatics are appearing
Starting from the simplest and the basic …

ADASS2009, Oct. 5-9, 2009, Sapporo, Japan

Chenzhou CUI

"facility class instrumentation“ in China
 Modern observational projects
 LAMOST, 21CMA, CSTAR, AST3, etc.

 Infrastructures for:
 Storage
 Data access Computing
 Preservation
 User support

ADASS2009, Oct. 5-9, 2009, Sapporo, Japan

Chenzhou CUICAS SDB for Astronomy
 A sub-project of Chinese Academy of Sciences

Scientific Database system Budget: 1.4 m RMB
 Period: 2009 to 2010
 Involved observatories: NAOC, SHAO, PMO(Nanjing) Datasets: LAMOST/CSTAR/BATC, SHAO
numeral simulations, PMO radio archives
ADASS2009, Oct. 5-9, 2009, Sapporo, Japan

Chenzhou CUI

Cosmology simulation~100TB
Y.P. Jing, et.al
Shanghai Astronomical
Observatory

ADASS2009, Oct. 5-9, 2009, Sapporo, Japan

Chenzhou CUI

Qinghai Radio Telescope
Diameter: 13.7m
Working band: 3 mm
Data rate: ~1MB/s, ~230K spectra/yr

SIS

ADASS2009, Oct. 5-9, 2009, Sapporo, Japan

18
Chenzhou CUI

Simple Dataset Model A dataset
 Metadata Data Attachment

ADASS2009, Oct. 5-9, 2009, Sapporo, Japan

Chenzhou CUI

Architecture

ADASS2009, Oct. 5-9, 2009, Sapporo, Japan

Chenzhou CUI

Spectrum view Image view
 Cross match Footprint SAMP etc.

Sync

Sync





Mics

Online service
Async



Combined

Catalogs
 Files

Image

Basic data access service

SpectrumCatalog

Components

Tools
CLI

ADASS2009, Oct. 5-9, 2009, Sapporo, Japan

Chenzhou CUI

20 years
20 years later,
Another world-class astronomical datacenter appears?...

ADASS2009, Oct. 5-9, 2009, Sapporo, Japan

Chenzhou CUI

Sincerely looking for your:Collaborations and suggestions
Thank you!

ADASS2009, Oct. 5-9, 2009, Sapporo, Japan

Chenzhou CUI