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Transcript of Chinese Virtual Observatory1 History and current status China-VO Project National Astronomical...
Chinese Virtual Observatory 1
History and current status
China-VO ProjectNational Astronomical Observatories, Chinese Academy of Sciences
The Chinese VIRTUAL OBSERVATORY
Chinese Virtual Observatory 2
Content
• Brief background• Strategies, goals and focuses• History and Activities• Future directions
Chinese Virtual Observatory 3
• NAOC– Beijing– Changchun– Urumchi– Kunming
• Purple Mountain Obs. (Nanjing)
• Shanghai Obs.– Qinghai Station
Observatories in CAS
Optical: 2.4mRadio: 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
• 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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•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
History and Events
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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
China-VO• 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:
– 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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Chinese Virtual Observatory 20
Topology
NAOC
YNAO
PKU
…
Internet
CNGrid
SSC SCCAS
CNIC
THU…
IVO
NVO
…AstroGrid
AVO
China-VO
USTC
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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/
Chinese Virtual Observatory
• Touch the sky with your mouse• An intelligent client for VO services• A commodity for astronomers and
students
A Smart On-line Astronomical Information Collector
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FitHAS: FITS Header Archiving System
• 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
FITS filesFITS files
User Interface Layer
Wizard
Core Transaction Layer
DatabaseFITS files
Header analysisMetadata Mapping
and Archiving Database controller
Header viewer
Database browser
Config-uration
Configuration filesArchive
moniter
Chinese Virtual Observatory 24
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 astronomersworks 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
• VO-DAS Server– WSRF based web service– Integrates OGSA-DAI services– Job controlling and monitoring
• DataNode– OGSA-DAI wrapped data
resources• Interfaces
– Resource Metadata Interface– Data Query Interface– Data Delivery Interface– Data Analysis Interface– Management Interface
Data Node
VO-DAS Server
Interfaces
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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
Interoperability
• 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.
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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. Bridginga) Bridging IVO Standards and Best Practice
b) Bridging VO and Domestic Community
b. Servicinga) User training
b) VO-enabled projects
c) Guiding VO-based sciences
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LLarge sky arge sky AArea rea MMulti-ulti-OObject fibre bject fibre SSpectroscopy pectroscopy TTelescopeelescope
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
VO-enabled LAMOST
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LAMOST Timeline
reviewed approved• Proposal Nov. 1996 Apr. 1997• Feasibility Study Jul. 1997 Aug. 1997• Preliminary Design Apr.-May 1999 Jun. 1999• Detailed Design Sep. 2001• Construction 2001-2008• First Light 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
?www. .org
The Chinese VIRTUAL OBSERVATORY