The Chinese VIRTUAL OBSERVATORY History and current status China-VO Project ational Astronomical Observatories, Chinese Academy of Scienc Chinese Virtual Observatory 1
Content • • Brief background Strategies, goals and focuses History and Activities Future directions Chinese Virtual Observatory 2
Observatories in CAS • NAOC – Beijing – Changchun – Urumchi – Kunming • Purple Mountain Obs. (Nanjing) • Shanghai Obs. – Qinghai Station Optical: 2. 4 m Radio: 50 m Chinese Virtual Observatory 3
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. Chinese Virtual Observatory 4
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 Chinese Virtual Observatory 5
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 Chinese Virtual Observatory 6
History and Events • 2001. 11 1 st 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 2 nd 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 Sky. Mouse 1. 0 released • 2006. 12 China-VO 2006 • 2007. 5 Fit. HAS 1. 0 released • 2007. 5 IVOA interoperability meeting, Beijing • 2007. 11 China-VO 2007 Chinese Virtual Observatory 7
China-VO Meeting (2001, Beijing) VO is important, we should involve… Chinese Virtual Observatory 8
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 Chinese Virtual Observatory 9
China-VO 2003, Beijing Chinese Virtual Observatory 10
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) Chinese Virtual Observatory 11
Brief Review Chinese Virtual Observatory 12
Chinese Virtual Observatory 13
China-VO 2004, Wuhan, Hubei Chinese Virtual Observatory 14
China-VO 2005 (Weihai, Shandong) Chinese Virtual Observatory 15
China-VO 2006 (Guilin, Guangxi) Chinese Virtual Observatory 16
IVOA 2007, Beijing Chinese Virtual Observatory 17
China-VO Architecture Chinese Virtual Observatory 18
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Topology Chinese Virtual Observatory 20
Two XSLT transforms • VOFilter – an XML filter for Open. Office. org Calc to open VOTable files – http: //services. china-vo. org/vofilter/ • VOTable 2 XHTML – a stylesheet to transform VOTable data into HTML/XHTML format – http: //services. china-vo. org/votable 2 xhtml/ Chinese Virtual Observatory 21
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 WEIHAI, Aug 2005
Fit. HAS: 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 Chinese Virtual Observatory 23
VO Data Access Service (VODAS) • 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 Chinese Virtual Observatory 24
VO-DAS Architecture Interfaces • VO-DAS Server – WSRF based web service – Integrates OGSA-DAI services – Job controlling and monitoring • Data. Node VO-DAS Server – OGSA-DAI wrapped data resources • Interfaces – – – Resource Metadata Interface Data Query Interface Data Delivery Interface Data Analysis Interface Management Interface Chinese Virtual Observatory Data Node 25
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VO-DAS Use Cases • Query Workflow – Synchronous Query – Asynchronous Query on multiple Data. Nodes Chinese Virtual Observatory 27
Asynchronous Query on Multiple Data. Nodes Chinese Virtual Observatory 28
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: Cone. Search, SIA, SSA, etc.
Status • An Alpha version of VO-DAS was ready – Query Workflow • Synchronous Query • Asynchronous Query on multiple Data. Nodes Chinese Virtual Observatory 30
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 Chinese Virtual Observatory 31
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 Chinese Virtual Observatory 32
Astrophysical Integrated Research Environment (AIRE) • Provide a web-based collaborative research environment Radio : Interferometry …, AIPS++, Difmap… Optical : Photometry … , IRAF, MIDAS … X-ray : Coded-mask …, HEADAS …. Contributed by Tsinghua University Chinese Virtual Observatory 33
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 Chinese Virtual Observatory 34
VO-enabled LAMOST Large sky Area Multi-Object fibre Spectroscopy Telescope Clear aperture: 4 m Field of view: 5° Focal plane: 1. 75 m Focal length: 20 m Number of fibers: 4000 Spectral ranges: 370～ 900 nm Spectral resolution: 1～ 0. 25 nm Sky coverage: Declination -10 to+90 A meridian reflecting Schmidt telescope Chinese Virtual Observatory 35
LAMOST Timeline • • • 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 -2008 Chinese Virtual Observatory 36
LAMOST today • 2007 • June: Small system • 6 Ma, 8 Mb sub-mirrors aperture ~ 2 m 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 ~ 4 m LAMOST • 2009: commission period • 2010 -2015: regular spectroscopic survey Chinese Virtual Observatory 37
VO-enabled LAMOST • VO-enabled – LAMOST data – LAMOST Spectral Analysis Pipeline Chinese Virtual Observatory 38
The Chinese VIRTUAL OBSERVATORY Q&A ? www. Chinese Virtual Observatory . org 39
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