Chinese Virtual Observatory Potential R&D focuses for China-VO Chenzhou Cui National Astronomical Observatory of China IVOA Small Projects Meeting 2003 11/26/2003 1
Outlines • IVOA emphasis • Pro and con for small VO projects • China-VO R&D focuses – – – Integration Data Access Services VO-enabled telescope VO-enabled LAMOST Education IVOA Small Projects Meeting 2003 11/26/2003 2
Outlines • IVOA emphasis • Pro and con for small VO projects • China-VO R&D focuses – – – Integration Data Access Services VO-enabled telescope VO-enabled LAMOST Education IVOA Small Projects Meeting 2003 11/26/2003 3
IVOA emphasis Mission: • to facilitate coordination of development • to foster interoperability IVOA Small Projects Meeting 2003 11/26/2003 4
IVOA emphasis • Working Groups • • Resource Registry Content Description (UCD) VOTable Grid & Web Services Data Modeling Data Access Layer VO Query Language Standards & Processes Explore technologies Develop standards Recommend best practices IVOA Small Projects Meeting 2003 11/26/2003 5
IVOA emphasis • Most popular topics: – – – – Interoperability Resource Registry Data Model Web&Grid Technology VOQL VOTable DAL Source from: Statistics for IVOA Web IVOA Small Projects Meeting 2003 11/26/2003 6
NVO • Building the Framework for the National Virtual Observatory » from: Paul Messina, Alex Szalay • NVO is not about building portals and applications, but rather emphasizes building standards and infrastructure. » from: Ray Plante IVOA Small Projects Meeting 2003 11/26/2003 7
The NVO Environment • Many resources, distributed curation – Thousands of individually accessible resources: Catalogs, observatory archives, surveys, spectra, services – Tens of data-providing centers NASA data centers, observatories, universities, research groups • Must build on the existing infrastructure Data providers already support services using… Databases, CGI, metadata, …. • Vast majority of data is publicly accessible Delivered over HTTP • Buy-in cost is a critical issue – Incremental compliance from: Ray Plante – Toolkits are helpful IVOA Small Projects Meeting 2003 11/26/2003 8
Enabling Standards and Technologies • Data Formats – – FITS – an existing standard for astronomical images & tables VOTable – an XML schema for transmitting astronomical tables • Data Access Protocols – – Cone Search – for searching catalogs by sky position Simple Image Access (SIA) – to search for/create images based on sky position HTTP Get Queries return VOTable documents prototypes! Currently in development within the IVOA: – Sky. Node – more generalized approach to catalog searching – VO Registries – for publishing and discovering resources Web Services • Grid Technologies – – Chimera & Pegasus – virtual data catalog and workflow management • Replica Catalog Service – built-in caching of results on the grid Condor from: Ray Plante IVOA Small Projects Meeting 2003 11/26/2003 9
Astro. Grid • The end goal of the project (phase B) is to produce software which will enable the creation of a working, grid−enabled Virtual Observatory (VO) based around key UK astronomical data centres. » (Astro. Grid Red Book) IVOA Small Projects Meeting 2003 11/26/2003 10
Astro. Grid The work breaks into a few major strands: • Continuing research and development; • Developing the software infrastructure that will make a VO possible; • Developing user tools to make it possible to do science with Astro. Grid. – portals, visualization tools, analysis tools, data mining algorithms, workflow editors, and so on » from: Astro. Grid Red Book IVOA Small Projects Meeting 2003 11/26/2003 11
Astro. Grid top−level practical goals • to develop … standards for data, metadata, data exchange and provenance • to develop a software infrastructure for data services • to establish a physical grid of resources shared by Astro. Grid and key data centres • to construct and maintain an Astro. Grid Service and Resource Registry • to implement a working Virtual Observatory system based around key UK databases and of real scientific use to astronomers • to provide a user interface to that VO system • to provide, either by construction or by adaptation, a set of science user tools to work with that VO system • to establish a leading position for the UK in VO work » from: Astro. Grid Red Book IVOA Small Projects Meeting 2003 11/26/2003 12
Outlines • IVOA emphasis • Pro and con for small VO projects • China-VO R&D focuses – – – Integration Data Access Services VO-enabled telescope VO-enabled LAMOST Education IVOA Small Projects Meeting 2003 11/26/2003 13
Outlines • IVOA emphasis • Pro and con for small VO projects • China-VO R&D focuses – – – Integration Data Access Services VO-enabled telescope VO-enabled LAMOST Education IVOA Small Projects Meeting 2003 11/26/2003 14
Disadvantages Limited: • Astronomy Research Level • Astronomical Resources – Data, Instruments and Telescopes • Technology – Software Develop, Database, Network • Funding – Is limited for us all IVOA Small Projects Meeting 2003 11/26/2003 15
Advantages • Great interests from native astronomers and IT experts • No historical backpacks – existing infrastructure, data service, CGIscripts, etc. • No large gaps among various projects – XML, Web Services, Grid, etc. IVOA Small Projects Meeting 2003 11/26/2003 16
Outlines • IVOA emphasis • Pro and con for small VO projects • China-VO R&D focuses – – – Integration Data Access Services VO-enabled telescope VO-enabled LAMOST Education IVOA Small Projects Meeting 2003 11/26/2003 17
Outlines • IVOA emphasis • Pro and con for small VO projects • China-VO R&D focuses – – – Integration Data Access Services VO-enabled telescope VO-enabled LAMOST Education IVOA Small Projects Meeting 2003 11/26/2003 18
China-VO R&D focuses Unlike NVO and Astro. Grid, as a small VO project, • China-VO will emphasize on applications and portals. • But we will take part in the developments of IVOA standards and infrastructure actively. IVOA Small Projects Meeting 2003 11/26/2003 19
Integration existing – – Software Packages, Toolkits, Libraries Astronomical Utilities Image Manipulation Math and Statistics Plotting the more simple I/O and simple user interface the more easier to integrate IRAF, MIDAS, AIPS, … need much user interaction almost impossible for integration IVOA Small Projects Meeting 2003 11/26/2003 20
Astronomical Utilities • Coordinate conversion – equatorial (RA, Dec) to horizon (alt, azimuth) coordinates • Date conversion – calendar date to Julian Date • Units conversion – Magnitude to flux • Ephemeris calculation – Sun set/rise, eclipse IVOA Small Projects Meeting 2003 11/26/2003 21
Image Manipulation • Format conversion – Jpg, gif, tiff, fits, … • Image edit – Rotate, resize, filter, … • image correlation, image aligning • FITS image manipulation – (C)FITSIO IVOA Small Projects Meeting 2003 11/26/2003 22
Math and Statistics data analysis curve fitting – simple math operations – linear fitting – differentiating – nonlinear fitting – integrating – statistics – Fast Fourier Transform (FFT) – (de)convolution – data smoothing – data filtering – Peak picking – data sorting IVOA Small Projects Meeting 2003 11/26/2003 23
Plotting • 1 D – spectrum, time series, … • 2 D – Line, Scatter, bar, column, pie, … – histogram, polar, vector, … • 3 D – bar, scatter, surface, contour, … IVOA Small Projects Meeting 2003 11/26/2003 24
Data Access Services • IVOA DAL and Interoperability standards – VOTable, SIA, UCD, VOQL, etc. • easy access to national and international astronomical datasets • especially important for countries absent of large observation instruments IVOA Small Projects Meeting 2003 11/26/2003 25
Major data resources in China National – BATC 15 color sky survey: 360 GB – Huairou & Yunnan solar observation: 700 GB – Miyun meter-wave sky survey: 5 GB IVOA Small Projects Meeting 2003 11/26/2003 26
Major data resources in China International CDS/ADC Catalog 100 G 2 MASS catalogs 40 G 2 d. F 7 G ROSAT 38 G DSS I 80 G DSS II 620 G SDSS EDR 60 G Einstein X-ray Survey 5 G ADS Mirror 400 G SDSS DR 1? IVOA Small Projects Meeting 2003 11/26/2003 27
VO-enabled telescope Current projects: • NAOC 2. 16 m telescope • Yunnan observatory 2. 4 m telescope • public internet observatory wide-field camera, 35 cm, 60 cm • Tsinghua Univ. 40 cm public telescope NAOC 2. 16 m telescope IVOA Small Projects Meeting 2003 11/26/2003 28
VO-enabled LAMOST • VO-enabled – LAMOST data – LAMOST telescope – LAMOST Spectral Analysis Pipeline IVOA Small Projects Meeting 2003 11/26/2003 29
VO-enabled LAMOST IVOA Small Projects Meeting 2003 11/26/2003 30
VO-based Education • • international education resource access bilingual Skymap English-Chinese astronomical dictionary … • China-VO education portal IVOA Small Projects Meeting 2003 11/26/2003 31
Thank You Q&A ? www. IVOA Small Projects Meeting 2003 . org 11/26/2003 32
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