崔辰州中科院国家天文台中国虚拟天文台研发团队

Nov. 22-25CAS 2007, GuangZhou

崔辰州

中科院国家天文台中国虚拟天文台研发团队

Chinese Virtual Observatory

VO is coming...


Content

• VO Introduction• IVOA and its specifications• China-VO• VO is READY for better science


What is VO


VO concept

• Virtual Observatory (VO) is a data-intensively online astronomical research and education environment, taking advantages of advanced information technologies to achieve seamless, global access to astronomical information.

• The power of the World Wide Web is its transparency. It is as if all the documents in the world are inside your PC. The idea of the Virtual Observatory is to achieve the same transparency for astronomical data and other related information (Quinn et al. 2004).


IVOA in Growth

• International Virtual Observatory Alliance (IVOA) • formed in June 2002• with a mission to facilitate the international

coordination and collaboration necessary for the development and deployment of the tools, systems and organizational structures necessary to enable the international utilization of astronomical archives as an integrated and interoperating virtual observatory.


VO drivers : science

Science driven, technic enabled

•multi-archive research•Precision Cosmology•The Time Domain•A Panchromatic approach to the Universe…


Science driven, technic enabled

VO drivers : technology

• hardware trends– ops, storage, bw : all 1000x/decade– data i/o bw 10x/decade

• data avalanche– CCD array– digital sky survey– numerical simulation

IVOA Protocolskey for

interoperability


VO framework

• agreed standards• inter-operable data collections• inter-operable software modules

• no central VO-command


Standardization

• Standard semantic• Standard data format• Standard data models • Standard access protocols• Standard registries


Protocol List

• VOTable• FITS• Cone Search Protocol• Simple Image Access (SIA) Protocol • Simple Spectral Access (SSA) Protocol • SkyNode• Astronomical Data Query Language (ADQL)• Uniform Column Descriptors (UCDs)• Space-Time Coordinates (STC)• IVOA Identifiers• VO Registry• Resource Metadata• Registry Access Protocols• OAI• VOEvent• NESSSI• VOSpace• PLASTIC• Common Execution Architecture• Request-Object Management Environment (ROM

E)


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.


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


VO-enabled LAMOST

• VO-enabled– LAMOST data– LAMOST

Pipeline


•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


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)


IVOA 2007, Beijing


Two XSLT transforms

• VOFilter– an XML filter for OpenOffice.org Calc to open VO

Table files– http://services.china-vo.org/vofilter/

• VOTable2XHTML– a stylesheet to transform VOTable data into HTM

L/XHTML format– http://services.china-vo.org/votable2xhtml/

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

http://services.china-vo.org/votable2xhtml/


• 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– An Alpha version of VO-DAS was ready


VO is READY for better science


NVO Core Services

• NVO Registry Portal: Find source catalogs, observation logs, image archives, and other astronomical resources registered with the NVO

• DataScope: Discover and Explore Data in the Virtual Observatory

• Open SkyQuery: Cross match yoru data with numerous catalogs

• NVO Spectrum Services: Search, plot, and retrieve SDSS, 2dF, and other spectra

• Web Source Extractor: Upload images to SExtractor and cross-correlate the objects found with selected survey catalogs.


Aladin V4

• Aladin v4an interactive software sky atlas developed by CDSMultiView, multiProjectionResamplingBlinking: builds on the fly image sequences (slow movies)GIF, JPEG and PNG supportCut graph: along any segmentCross match algorithm: for better object catalog analysisMulti-language


PLASTIC


VO Science Papers

• Discovery of optically faint obscured quasars with Virtual Observatory tools (2004A&A...424..545P)

• Luminous AGB stars in nearby galaxies. A study using virtual observatory tools (2006A&A...447...89T)

• Candidate Milky Way satellites in the Galactic halo （ Liu et al., A&A in press)

First science paper from China-VO

A new prosperous era for astronomical software and services

Astrogrid WorkbenchAladin

VizieR

Simbad

Datascope

Astroscope

TopcatVOSpec

VOPlot

SPLATSTILTS

EURO-3D

Specview

VisIVO

VOSEDADS

Helioscope

Yafit

Registry

PLASTIC

Web Service

SIA

SSA

VOTable

Astro Runtime

MySpace

WorkflowWorkflow

Open SkyQuery

VOEventNet

It is not a thing


IYA: Astronomy 2009

• The official slogan of the IYA 2009 is:

The Universe: Yours to Discover

Return your suggestions to:• [email protected]• 天文名词委邮件列表（ http://

tech.groups.yahoo.com/group/astro-terms/ ）

崔辰州 中科院国家天文台 中国虚拟天文台研发团队

Documents

崔辰州中科院国家天文台中国虚拟天文台研发团队