Transcript China-VO, History and Current Status. (Sep. 27, 2007)

The Chinese VIRTUAL OBSERVATORY
History and current status
China-VO Project
ational Astronomical Observatories, Chinese Academy of Scienc
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Content
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Brief background
Strategies, goals and focuses
History and Activities
Future directions
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Observatories in CAS
• NAOC
– Beijing
– Changchun
– Urumchi
– Kunming
• Purple Mountain Obs.
(Nanjing)
• Shanghai Obs.
– Qinghai Station
Optical: 2.4m
Radio: 50m
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China-VO
• Chinese Virtual Observatory (China-VO) is the national VO
project in China initiated in 2002 by Chinese astronomical
community led by National Astronomical Observatories,
Chinese Academy of Sciences.
• The China-VO aims to provide VO infrastructure for
Chinese astronomers and to share astronomical resources
in China to the world.
• It focuses its research and development on VO science
and applications.
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Development of China-VO
• Advanced research platform for Chinese
astronomers
• Import data and technologies from IVOA
partners
• Share Chinese datasets with international
astronomers
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Bring up a group of VO-oriented
astronomers, engineers and students
Education outreach
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R&D Focuses
• China-VO Platform
– 中国虚拟天文台系统平台的开发
• Unified Access to On-line Astronomical
Resources and Services
– 国内外天文研究资源的统一访问
• VO-ready Projects and Facilities
– 支持VO的项目与观测设施
• VO-based Astronomical Research Activities
– 基于VO的天文研究示范
• VO-based Public Education
– 基于VO的天文科普教育
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History and Events
•2001.11 1st VO workshop in China
•2002.7 “China-VO” kicked off
•2002.10 “China-VO” became a member of the IVOA
•2003.6 China-VO system design
•2003.9 the 2nd VO workshop
•2003.11 IVOA Small Projects Meeting
•2004.5 VOFilter 1.0 released
•2004.12 China-VO 2004
•2005.8 VOFilter 2.0 released
•2005.11 China-VO 2005
•2006.5 VO-DAS project began
•2006.7 SkyMouse 1.0 released
•2006.12 China-VO 2006
•2007.5 FitHAS 1.0 released
•2007.5 IVOA interoperability meeting, Beijing
•2007.11 China-VO 2007
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China-VO Meeting (2001, Beijing)
VO is important, we should involve…
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China-VO in 2002
• “China-VO” initiated
• China-VO PI (Yongheng Zhao) attended the VO conference
in Garching, ESO
• Dr. Jim Gray (NVO, Microsoft Research) visited the ChinaVO
• China-VO became a member of the IVOA
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China-VO 2003, Beijing
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Small project meeting, Beijing
• 26-28 November 2003: Beijing, China
• Main topics:
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Advantages and disadvantages of small projects.
The role of small projects in the IVOA.
R&D focus of small projects.
Collaboration among small projects and with big VO
projects.
– Implementation of IVOA standards and infrastructures
developed by other VO projects.
• 39 participants from Korea, Japan, India, Europe,
UK and China (including Taiwan)
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Brief Review
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China-VO 2004, Wuhan, Hubei
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China-VO 2005 (Weihai, Shandong)
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China-VO 2006 (Guilin, Guangxi)
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IVOA 2007, Beijing
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China-VO Architecture
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Topology
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Two XSLT transforms
• VOFilter
– an XML filter for OpenOffice.org Calc to open
VOTable files
– http://services.china-vo.org/vofilter/
• VOTable2XHTML
– a stylesheet to transform VOTable data into
HTML/XHTML format
– http://services.china-vo.org/votable2xhtml/
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A Smart On-line Astronomical Information
Collector
• Touch the sky with your mouse
• An intelligent client for VO services
• A commodity for astronomers and
students
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FitHAS: FITS Header Archiving System
Wizard
User Interface
Layer
• An useful assistant tool for
FITS providers and managers
• Importing FITS keyword
records for one or more FITS
files under a given directory
into a database by several
mouse clicks
Header
viewer
Core Transaction
Layer
Header analysis
FITSfiles
files
FITS
FITS
files
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Archive
moniter
Database
browser
Metadata Mapping
and Archiving
Configuration
Configuration
files
Database
controller
Database
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VO Data Access Service (VO-DAS)
• An OGSA-DAI based service system to provide unified
access to astronomy data, including catalogs, images and
spectra.
• Goals of VO-DAS
– Supporting high volume data query
– Interlinking distributed and heterogeneous archives
• catalogs, images, spectrums
– Providing a software that works for astronomers
• OGSA-DAI Supported Asynchronous Data Access Service
– OGSA-DAI is a middleware product which supports the
exposure of data resources, such as relational or XML
databases, on to grids.
– Work with Globus Toolkit 4
– WSRF interface
– Good wrapper for variant databases
– Asynchronous query supported
– Available for large dataset
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VO-DAS Architecture
Interfaces
• VO-DAS Server
– WSRF based web service
– Integrates OGSA-DAI services
– Job controlling and monitoring
• DataNode
VO-DAS Server
– OGSA-DAI wrapped data
resources
• Interfaces
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Resource Metadata Interface
Data Query Interface
Data Delivery Interface
Data Analysis Interface
Management Interface
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Data Node
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VO-DAS Use Cases
• Query Workflow
– Synchronous Query
– Asynchronous Query
– Asynchronous Query on multiple DataNodes
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Asynchronous Query on Multiple DataNodes
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Interoperability
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Resource Registry: VO Registry
Archive Integration: OGSA-DAI WSRF
Query Language: ADQL and extension
Data Format: VOTable, ASCII, CSV, FITS etc.
Storage: FTP, (VOSpace?)
Interfaces: ConeSearch, SIA, SSA, etc.
Status
• An Alpha version of VO-DAS was ready
– Query Workflow
• Synchronous Query
• Asynchronous Query
• Asynchronous Query on multiple DataNodes
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Performance
• High Volume Data Query Test
– Long time to query and retrieve big data file
• Frequently Data Query Test
– Multiple user simultaneously query
– A user frequently access data from server
• Conclusion
– A million rows can be handled successfully
• Depend on memory size
– It is not stable when simultaneously query (high loaded
case)
• Reason: OGSA-DAI’s defect? Or database problem?
– It is complicated to handle failure
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Planning for VO-DAS
• Short Term
– Image and spectra support
– A stable system
• Used by astronomers in a small community
• Long Term
– VO-DAS + VOSpace?
– VO-DAS + VO applications?
– VO-DAS + Advanced Workflow?
• Document and Q&A
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Astrophysical Integrated Research
Environment (AIRE)
• Provide a web-based collaborative research environment
Radio : Interferometry …, AIPS, AIPS++, Difmap…
Optical : Photometry … , IRAF, MIDAS …
X-ray : Coded-mask …, HEADAS ….
Contributed by Tsinghua University
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Roles of Small VO Projects
a. Bridging
a) Bridging IVO Standards and Best Practice
b) Bridging VO and Domestic Community
b. Servicing
a) User training
b) VO-enabled projects
c) Guiding VO-based sciences
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VO-enabled LAMOST
Large sky Area Multi-Object fibre
Spectroscopy Telescope
Clear aperture: 4m
Field of view:  5°
Focal plane:  1.75m
Focal length:20m
Number of fibers:4000
Spectral ranges:370～900nm
Spectral resolution:1～ 0.25nm
Sky coverage:Declination -10  to+90
A meridian reflecting Schmidt telescope
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LAMOST Timeline
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Proposal
Feasibility Study
Preliminary Design
Detailed Design
Construction
First Light
reviewed
Nov. 1996
Jul. 1997
Apr.-May 1999
approved
Apr. 1997
Aug. 1997
Jun. 1999
Sep. 2001
2001-2008
2008
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LAMOST today
• 2007
• June: Small system
• 6Ma, 8 Mb sub-mirrors
 aperture ~ 2m LAMOST
• Small focal plane + 250 fibers
• One spectrograph +2 CCDs  LRS
• 2008
• Optic (Ma 24 + Mb 37)
• Instruments (4000 fibers, 16 spectrograph, 32 CCDs)
 Complete system ~ 4m LAMOST
• 2009: commission period
• 2010-2015: regular spectroscopic survey
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VO-enabled LAMOST
• VO-enabled
– LAMOST data
– LAMOST Spectral Analysis Pipeline
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Q&A
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www.
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