INAFCatania Astrophysical Observatory

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VisIVO Interoperable visualisation tool for VO
data

• INAFCatania Astrophysical Observatory
• U. Becciani1,M. Comparato1, A. Costa1, C.
  Gheller2,B. Larsson1

1 INAF Catania Astrophysical Observatory 2
CINECA
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VisIVO
VisIVO is a visualisation package developed in
collaboration between INAF (Catania Astrophysical
Observatory) and CINECA (the largest Italian
academic supercomputing center) with the specific
object of supporting visualization and analysis
of astrophysical data. Included in the Italian
participation (Trieste, Napoli, Rome and Catania)
to the VO-TECH project.

• Free Software
• Cross Platform (Windows and Linux alpha release)
• N-Dim (gt3) Visualization of Astrophysical data
  (lut and glyphs gt scalar properties of each
  element)
• Point, Volume and Vector Visualization
• Astrophysical Data Analysis
• VO (Virtual Observatory) compliance
  (Interoperability VOT, PLASTIC,VizieR)
• Connects to VizieR 2 Web Service
• Use External Grid Enabled Web Service Tools
• (Posters Terrace 1 n. 186 F. Pasian et al,
  n.187 A. Costa et al.)

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Supported file formats

• Input- VO-Table- HDF5 Files- Raw Binary
  Files- Fits tables, and Volumes (raw grid and
  FITS volume)- ASCII table
• Output- VO-Table- ASCII table- Raw Binary
• - Rendering Windows Images

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Different Visualisations
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Graphical features2D Visualisation

• Visualizes data in a plane
• Supports the same functionalities as
• the 3D data

Zoom Lookup tabe Algorithms Data selection Picker
op. Interop. etc
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Graphical features Point Sampler

• Selects a subset of the points
• Creates a new object in the application
• This object supports all the graphical
  functionalities
• as the original one
• Sample using a box or ISO-Surface (extract
  cluster)

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VisIVO main points

• VizieR data download, cone search
• Interoperability
• Vector Visualisation
• Data Cluster extraction

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VisIVO built-in Algorithms
Randomizer extract a random subset of points
Power Spectrum calculate the power spectrum of
a distribution of points Correlation Filter
calculate the correlation function in a point
distribution. Minkowsky Functionals evaluate the
geometry and the topology of a point
distribution Points Splatter distribute (using
Cloud in Cell algorithm) point-scalars on a
regular mesh
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VisIVO and Desktop Interoperability

• Makes use of PLASTIC
• Developed in the VO-TECH project
• PLASTIC lets the applications talk to each
  other
• Allows Synchronized actions
• Interact with the same data in many different
  ways
• Gives different perspectives of the same data in
  different applications

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Interop PLASTIC

• Interoperability with other VO compliant tools
• PLASTIC
• Topcat
• Aladin
• TabView - A simple Table Viewer
• VAST - A SIAP access tool that uses Plastic to
  load images in Aladin

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Interoperability
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VizieR 2

• Remote resource containing observational data
• Perform a cone search in remote sources
• Reduce the amount of data to work with
• Download relevant results as VO-Tables

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Linux porting Alfa version vs. Beta version

• OpenMAF developed on Fedora Core 2
• VisIVO developed and fully supported on Debian
  GNU/Linux (Sarge, current stable release)
• Binaries tested under Fedora Core 4
• tar.gz with raw binaries installation package
  available
• Ported all the functionalities currently
  available on the Windows platform

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VisIVO screenshots on Linux
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Thank You For Listening
http//visivo.oact.inaf.it