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

Chinese Virtual Observatory 1

History and current status

China-VO ProjectNational Astronomical Observatories, Chinese Academy of Sciences

The Chinese VIRTUAL OBSERVATORY


Content

• Brief background• Strategies, goals and focuses• History and Activities• Future directions


• NAOC– Beijing– Changchun– Urumchi– Kunming

• Purple Mountain Obs. (Nanjing)

• Shanghai Obs.– Qinghai Station

Observatories in CAS

Optical: 2.4mRadio: 50m


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.


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


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


•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


China-VO Meeting (2001, Beijing)

VO is important, we should involve…


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


China-VO 2003, Beijing


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)


Brief Review



China-VO 2004, Wuhan, Hubei


China-VO 2005 (Weihai, Shandong)


China-VO 2006 (Guilin, Guangxi)


IVOA 2007, Beijing


China-VO Architecture



Topology

NAOC

YNAO

PKU

…

Internet

CNGrid

SSC SCCAS

CNIC

THU…

IVO

NVO

…AstroGrid

AVO

China-VO

USTC


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/

http://services.china-vo.org/vofilter/

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


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


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


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



VO-DAS Use Cases

• Query Workflow– Synchronous Query– Asynchronous Query– Asynchronous Query on multiple DataNodes


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.


Status

• An Alpha version of VO-DAS was ready– Query Workflow

• Synchronous Query• Asynchronous Query• Asynchronous Query on multiple DataNodes


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


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


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


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


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


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


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


VO-enabled LAMOST

• VO-enabled– LAMOST data– LAMOST Spectral Analysis Pipeline


Q & A

?www. .org

The Chinese VIRTUAL OBSERVATORY

Documents

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