Chinese Virtual Observatory1 History and current status China-VO Project National Astronomical Observatories, Chinese Academy of Sciences The Chinese V IRTUAL O BSERVATORY

Chinese Virtual Observatory2 Content Brief background Strategies, goals and focuses History and Activities Future directions

Chinese Virtual Observatory3 NAOC –Beijing –Changchun –Urumchi –Kunming Purple Mountain Obs. (Nanjing) Shanghai Obs. –Qinghai Station Observatories in CAS Optical: 2.4m Radio: 50m

Chinese Virtual Observatory4 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 Observatory5 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 Observatory6 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 st VO workshop in China “China-VO” kicked off “China-VO” became a member of the IVOA China-VO system design the 2nd VO workshop IVOA Small Projects Meeting VOFilter 1.0 released China-VO VOFilter 2.0 released China-VO VO-DAS project began SkyMouse 1.0 released China-VO FitHAS 1.0 released IVOA interoperability meeting, Beijing China-VO 2007 History and Events

Chinese Virtual Observatory8 China-VO Meeting (2001, Beijing) VO is important, we should involve…

Chinese Virtual Observatory9 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 Observatory10 China-VO 2003, Beijing

Chinese Virtual Observatory11 Small project meeting, Beijing 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 Observatory12 Brief Review

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Chinese Virtual Observatory14 China-VO 2004, Wuhan, Hubei

Chinese Virtual Observatory15 China-VO 2005 (Weihai, Shandong)

Chinese Virtual Observatory16 China-VO 2006 ( Guilin, Guangxi)

Chinese Virtual Observatory17 IVOA 2007, Beijing

Chinese Virtual Observatory18 China-VO Architecture

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Chinese Virtual Observatory20 Topology

Chinese Virtual Observatory21 Two XSLT transforms VOFilter –an XML filter for OpenOffice.org Calc to open VOTable files – VOTable2XHTML –a stylesheet to transform VOTable data into HTML/XHTML format –

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

Chinese Virtual Observatory23 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

Chinese Virtual Observatory24 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 works for astronomers –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 Observatory25 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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Chinese Virtual Observatory27 VO-DAS Use Cases Query Workflow –Synchronous Query –Asynchronous Query –Asynchronous Query on multiple DataNodes

Chinese Virtual Observatory28 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.

Chinese Virtual Observatory30 Status An Alpha version of VO-DAS was ready –Query Workflow Synchronous Query Asynchronous Query Asynchronous Query on multiple DataNodes

Chinese Virtual Observatory31 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 Observatory32 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 Observatory33 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

Chinese Virtual Observatory34 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 Observatory35 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 VO-enabled LAMOST

Chinese Virtual Observatory36 LAMOST Timeline reviewed approved Proposal Nov Apr Feasibility Study Jul Aug Preliminary Design Apr.-May 1999 Jun Detailed Design Sep Construction First Light 2008

Chinese Virtual Observatory37 LAMOST today 2007 June: Small system 6Ma, 8 Mb sub-mirrors  aperture ~ 2m LAMOST Small focal plane 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 : regular spectroscopic survey

Chinese Virtual Observatory38 VO-enabled LAMOST VO-enabled –LAMOST data –LAMOST Spectral Analysis Pipeline

Chinese Virtual Observatory39 Q & A ? The Chinese V IRTUAL O BSERVATORY