Integrating Existing Software Toolkits into VO System

Chenzhou Cui, Yongheng Zhao, Xiaoqian Wang, Jian Sang

National Astronomical Observatory of China

Ze LuoComputer Network Information Center, CAS

Chinese Virtual Observatory

2004-6-25SPIE 2004, Glasgow 2

Existing Software Resources

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

Comprehensive data processing environments– IRAF– MIDAS– AIPS/AIPS++

TDC (http://tdc-ww.harvard.edu/astro.software.html)ASDS (http://asds.stsci.edu/ )

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Astronomical Utilities

• Coordinate conversion– equatorial (RA, Dec) to horizon (alt, azimuth) co

ordinates • Date conversion

– calendar date to Julian Date• Units conversion

– Magnitude to flux,,,• Ephemeris calculation

– Sun set/rise, eclipse

2004-6-25SPIE 2004, Glasgow 4

Image Manipulation

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

• Image edit– Rotate, resize, filter,…

• Image correlation, image aligning,mosaics• FITS image manipulation

– (C)FITSIO

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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

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Plotting

• 1D– spectrum, time series, …

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

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

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Issues

• Application is crucial for VO – Extensively applications are key criteria to

measure the success of VO– Software has been an essential part in

`doing astronomy‘

• Scratching or inheriting?– New infrastructure and new tools are

necessary– Reuse of existing resources is also

necessaryVO Integration

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General Integrating Approaches

Java-readyrewritingwrapping

China-VO view:

VO is an advanced application of the GRIDGrid-ready

VO-ready

Existing Applications

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Two Integration Tactics

• Specific Tactics– to integrate existing software one by one – high quality

• Problem-Solving Environments – a fully or semi automatic solution for the

wrapping of legacy codes – JACAW, GAT, GAF4J, JCI , CEA– high efficiency

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Two integration efforts from China-VO

• A consortium initiated by National Astronomical Observatory of China

• Still in early research phase • Focuses on application and implementation• Act as a bridge between IVO and its end-users• Provide some best practices for the IVO

• gImageMagick, grid-enabled ImageMagick• Grid Environment for Galactic abundance gradient

s Statistical Research

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gImageMagick

ImageMagick• An open-source but robust collection of tools and l

ibraries to read, write, and manipulate an image

• Good candidate for integration – Useful function features for VO visualization– Good CLI– Multi OS support– Friendly APIs in many programming languages

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gImageMagick

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VO extension for gImageMagick

• IVOA interfaces support– SIAP– VOResource

• Well-packaged, easy of installation and easy of use• Providing G/W Service interface for standard Imag

eMagick installation (RPM, gz)

• http://services.china-vo.org• IVOA applications mailing list: “apps@ivoa.net”

2004-6-25SPIE 2004, Glasgow 14

Grid Environment for Galactic abundance gradients Statistical Research

Dynamic Data(X,Y,Z,U,V,W)

Galactic Mass Distribution Model

Orbit Parameters(Rmax, Zmax)

Stellar Abundances[M/H]

Abundance Gradient

2004-6-25SPIE 2004, Glasgow 15

Grid Environment for Galactic abundance gradients Statistical Research

2004-6-25SPIE 2004, Glasgow 16

VO Integration

• VO services:– not defined clearly– Compliant to IVOA specifications– Standard Interfaces

• The role of common application environments

• What application is good candidate for VO services?

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

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

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Q & A

?www. .org

Thank You