11/26/2003IVOA Small Projects Meeting 20031 Potential R&D focuses for China-VO Chenzhou Cui National Astronomical Observatory of China Chinese Virtual

11/26/2003IVOA Small Projects Meeting 2003 1

Potential R&D focuses for China-VO

Chenzhou CuiNational Astronomical Observatory of China

Chinese Virtual Observatory


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


Outlines




IVOA emphasis

Mission:

• to facilitate coordination of development

• to foster interoperability


IVOA emphasis

• Working Groups• Resource Registry Data Modeling • Content Description (UCD) Data Access

Layer • VOTable VO Query Language • Grid & Web Services Standards &

Processes

Explore technologiesDevelop standardsRecommend best practices

http://www.ivoa.net/twiki/bin/view/IVOA/IvoaResReg


IVOA emphasis

• Most popular topics: – Interoperability

– Resource Registry

– Data Model

– Web&Grid Technology

– VOQL

– VOTable

– DAL

Source from: Statistics for IVOA Web


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


The NVO Environment

• Many resources, distributed curation– Thousands of individually accessible resources:

Catalogs, observatory archives, surveys, spectra, services

– Tens of data-providing centersNASA 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 accessibleDelivered over HTTP

• Buy-in cost is a critical issue– Incremental compliance– Toolkits are helpful from: Ray Plante


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

positionHTTP Get Queries return VOTable documents prototypes!

Currently in development within the IVOA:– SkyNode – 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

– Condorfrom: Ray Plante


AstroGrid

• 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.

» (AstroGrid Red Book)


AstroGrid

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 AstroGrid.– portals, visualization tools, analysis tools, data

mining algorithms, workflow editors, and so on

» from: AstroGrid Red Book


AstroGrid 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 AstroGrid and key

data centres • to construct and maintain an AstroGrid 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: AstroGrid Red Book


Outlines




Outlines




Disadvantages

Limited: • Astronomy Research Level• Astronomical Resources

– Data, Instruments and Telescopes

• Technology– Software Develop, Database, Network

• Funding– Is limited for us all


Advantages

• Great interests from native astronomers and IT experts

• No historical backpacks– existing infrastructure, data service, CGI-

scripts, etc.

• No large gaps among various projects– XML, Web Services, Grid, etc.


Outlines




Outlines




China-VO R&D focuses

Unlike NVO and AstroGrid, 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.


Integration

existing Software Packages, Toolkits, Libraries– Astronomical Utilities – Image Manipulation – Math and Statistics– Plotting

IRAF, MIDAS, AIPS, …need much user interactionalmost impossible for integration

the more simple I/O and simple user interfacethe more easier to integrate


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


Image Manipulation

• Format conversion– Jpg, gif, tiff,fits,…

• Image edit– Rotate, resize, filter,…

• image correlation, image aligning• FITS image manipulation

– (C)FITSIO


Math and Statistics

data analysis – simple math

operations– differentiating– integrating– statistics– Fast Fourier

Transform (FFT)– (de)convolution– data smoothing– data filtering– Peak picking– data sorting

curve fitting– linear fitting– nonlinear fitting


Plotting

• 1D– spectrum, time series, …

• 2D– Line, Scatter, bar, column, pie, …– histogram, polar, vector,…

• 3D– bar, scatter, surface, contour, …


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


Major data resources in China

National

– BATC 15 color sky survey: 360 GB

– Huairou & Yunnan solar observation:700 GB

– Miyun meter-wave sky survey: 5GB


Major data resources in China

InternationalCDS/ADC Catalog 100G2MASS catalogs 40G

2dF 7G

ROSAT 38GDSS I 80GDSS II 620G

SDSS EDR 60G

Einstein X-ray Survey

5G

ADS Mirror 400GSDSS DR1?


VO-enabled telescope

Current projects:

• NAOC 2.16m telescope• Yunnan observatory 2.4m

telescope • public internet observatory

wide-field camera, 35cm, 60cm

• Tsinghua Univ. 40cm public telescope

NAOC 2.16 m telescope


VO-enabled LAMOST

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


VO-enabled LAMOST


VO-based Education

• international education resource access• bilingual Skymap• English-Chinese astronomical dictionary• …

• China-VO education portal


Q & A

?www. .org

Thank You

Documents

11/26/2003IVOA Small Projects Meeting 20031 Potential R&D focuses for China-VO Chenzhou Cui National Astronomical Observatory of China Chinese Virtual