VisIVOWeb Theory Group

VisIVOWeb: a web
solution for visualizing
cosmological simulations

Alessandro Costa
INAF
Astrophysical Observatory of Catania, Italy
Email: alessandro.costa(at)oact.inaf.it

Let’s begin from … ITVO
!   ITVO: Italian Theoretical Virtual Observatory

!   The ITVO is part of a joint collaboration between
Italian Insitute for Astrophysics (INAF) and CINECA
supercomputing center

!   ITVO has a number of different data centers and
services groupped under a single point of access:

“Theory” link in http://vobs.astro.it/

Alessandro Costa IVOA Interop. Meeting Nov.2009

Some interesting datasets in
ITVO CT
!   ITVO CT http://itvo.oact.inaf.it is an online data
centerof cosmological simulations.
!   The latest dataset in ITVO CT is the whole sequence
of outcomes of a 512.000.000 particle simulation
performed through a N-body algorithm , for three-
dimensional self-gravitating collisionless systems
evolution.
!   It has been carried out by the cosmology group at
INAF CATANIA using the grid of the COMETA
Consortium http://www.consorzio-cometa.it/


Data and services in ITVO CT
!   Access to the row datasets (512.000.000 Particles ->
12GB )

!   Access to a quick look randomized dataset
!   Default: 2.000.000 Particles
!   Run time generated by the randomizer service

!   Access to a run time generated sub-sample dataset:
!   Spherical: run time generated
!   Rectangular: run time generated


AHF results in ITVO CT
Adaptive Mesh Investigations of Galaxy Assembly

!   Access AHF results:

!   Halos list

!   Datasets representing particles contained in subunits-
halos

!   Datasets representing particles contained in field -halos

!   Datasets representing particles contained in void-halos


Visualization services in ITVO CT
!   Visualization services offered by VisIVOWeb

!   Each dataset both existing or run time
generated can be loaded seamlessly into one of
the VisIVOWeb portals.


VisIVO Projects
!   VisIVODesktop
!   VisIVOServer
!   VisIVOWeb

VisIVOWeb
http://visivoweb.oact.inaf.it
!   VisIVOWeb is part of a joint collaboration between Italian
Insitute for Astrophysics (INAF), CINECA supercomputing
center and University of Portsmouth
!   VisIVOWeb aims at providing our community with
multidimensional online Visualization tool.
!   VisIVOWeb is a network of portals

!   INAF CT Italy
!   INAF TS Italy
!   University of Portsmouth UK


VisIVOWeb
!   The primary goal of VisIVOWeb is:

to aid the scientist understanding complex data.

Outcomes of simulations become larger keeping up with
the constant increase of computational power. (i.e.
12GB each time-step -> 512M Body Simulation).

!   Images

!   Animations


VisIVOWeb
!   PHP 5 -> Joomla! 1.5
!   Mysql
!   VisIVOServer (c++)
!   VTK
!   Splotch
Open Source Projects
!   JAVA GPL V2
SourceForge


VisIVOWeb: Authentication
!   You can connect to VisIVOWeb in two ways:
!   Registered user
!   Anonymous

!   Each user, both the authorized one and the anonymous, has its own
staging area and he can upload and manage its own data: images,
tables and movies without any interference with other user data.

!   Anonymous : 4 day since the last access.

At the and of this period all data will be removed from the system.

Registered user: 2 months since the last access

(some warning e-mails will be sent to the user before the end of the
account lifetime)


VisIVOWeb Connect
This technology allows a web archive to
import a data file in a VisIVOWeb Portal.

!   The dataset must to be accessible via its URL


VisIVOWeb: importing a
dataset


VisIVOWeb Connect
!   The service can be invoked using this syntax:

!   http://VisIVOWeb Portal?url=URL&data_file=votable

!   Accepted data files: votable, fly, fits, ascii, csv,
GADGET2

visivoweb.oact.inaf.it/visivoweb/VisIVOWebConnect.php
palantir7.oats.inaf.it/visivoweb/VisIVOWebConnect.php
visivo.port.ac.uk/visivoweb/VisIVOWebConnect.php


ITVO&VisIVOWeb:
a 10 minutes demo


Login and select a simulation
!   Login into the INAF Catania portal: http://itvo.oact.inaf.it

!   Build and submit a query.

!   Select a dataset


AHF results
!   When you select a simulation you can can download a
tarball containing all the results of an AHF run.

AHF (Amiga Halo Finder)


Access services
!   Or you can access to “Level 1” services.


Access services
!   Choose a service.


Access services
!   Randomizer: allows you to randomize a simulation by
choosing the percentage of particle to be randomly
extracted.


Access services
!   Sub-Volume: allows you to extract a spherical or
rectangular sub-volume by choosing its geometry


Browse AHF halos datasets
!   AHF halos: allows you to access two subset of particles
representing:
!   halos in subunits

!   halos in void.


Overview
!   Using the spherical sub-volume extraction on ITVO-CT data
center we created a new dataset.

!   Using VisIVOWeb Connect we imported this dataset into a
VisIVOWeb portal.

!   Through VisIVOWeb operation (Point Property) we associated a
mass density to each particle using a Cloud-In-Cell (CIC)
algorithm

!   We visualized the dataset using both VTK and Splotch

!   We built a movie of the dataset around some chosen frames

Some short VisIVOWeb movies: VTK
A spherical cutout from http://itvo.oact.inaf.it VTK visualization
ftp://astrct.oact.inaf.it/pub/acosta/VisIVOWeb/Movies/movie7.gif


A spherical cutout from http://itvo.oact.inaf.it Splotch visualization


Particles in subunit-clusters 512.000.000 z=0.1 Cubic-Cutout 40Mpc
VTK Visualization

Particles in subunit-clusters 512.000.000 z=0.1 Cubic-Cutout 40Mpc
Splotch Visualization

Online tutorial on YouTube
ViSIVOWeb online Tutorial
!   http://www.youtube.com/view_play_list?
p=A7ECAF614EAE7970&search_query=visivoweb

VisIVOServer online tutorial
!   http://www.youtube.com/view_play_list?
p=A7ECAF614EAE7970&search_query=visivoserver


VisIVOWeb Theory Group

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