Vislab Research

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The 2MASS redshift survey galaxy group catalogue derived from a graph-theory based friends-of-friends algorithm

Trystan S. Lambert, R. C. Kraan-Korteweg, T. H. Jarrett and L. M. Macri

Type: Paper
A galaxy group catalogue for the recently-completed 2MASS Redshift Survey (2MRS) is presented, consisting of 3022 groups, and 44572 redshifts, including 1041 new measurements for galaxies mostly located within the Zone of Avoidance. The catalogue is generated by using a novel, graph-theory based, modified version of the Friends-of-Friends algorithm. The results and graph-theory methods presented in this paper have been thoroughly interrogated against previous 2MRS group catalogues by making use of cutting-edge visualization techniques and the immersive visualisation facilities of the IDIA Vislab.

The WISE Extended Source Catalogue (WXSC)
I: The 100 Largest Galaxies

T.H. Jarrett, M.E. Cluver, M.J.I. Brown, D.A. Dale, C.W. Tsai, and F. Masci

Type: Data Release
Mid-infrared photometry and measured global properties of the 100 largest galaxies in the sky is presented, including the well-studied Magellanic Clouds, Local Group galaxies M31 and M33, the Fornax and Virgo Galaxy Cluster giants, and many of the most spectacular Messier objects (e.g., M51 and M83). This is the first release of a larger catalog of extended sources as imaged in the mid-infrared, called the WISE Extended Source Catalogue (WXSC).

The DataToDome Initiative at the Iziko Planetarium in Cape Town and the IDIA Visualisation Lab

Lucia Marchetti, Thomas H. Jarrett1, Angus Comrie, Alexander K. Sivitilli1, Sally Macfarlane, Russ Taylor and MichelleCluver, 2019, ADASS XXI

Type: Paper
With the advent of the SKA and other petabyte-scale data facilities, both the data storage and the data interrogation represent two new challenges facing the scientific community. The recently inaugurated Iziko Planetarium 8K Digital Dome and the Inter-University Institute for Data Intensive Astronomy (IDIA) Visualisation Lab are two linked, cutting-edge research facilities in Cape Town that are exploring new approaches to handle the exploration and detailed interrogation of large astronomical (and multi-disciplinary) data sets. These include development of a server-client visualisation tool, the development of Virtual Reality software to explore large 3D data-sets, and the exploitation of the Planetarium 3D immersive projection to visualise big data-sets in the context of the DataToDome initiative.
Virtual Reality and Immersive Collaborative Environments: theNew Frontier for Big Data Visualisation

Alexander K. Sivitilli, Angus Comrie, Lucia Marchetti, and Thomas H. Jarrett 2019, ADASS XXI

Type: Paper
The IDIA Visualisation Laboratory based at the University of Cape Townis exploring the use of virtual reality technology to visualise and analyse astronomicaldata. The iDaVIE software suite currently under development reads from both volumetricdata cubes and sparse multi-dimensional catalogs, rendering them in a room-scaleimmersive environment that allows the user to intuitively view, navigate around andinteract with features in three dimensions.This paper will highlight how the software imports from common astronomy dataformats and processes the information for loading into the Unity game engine. It willalso describe what tools are currently available to the user and the various performanceoptimisations made for seamless use. Applications by astronomers will be reviewed in addition to the features we plan to include in future releases.
Virtual Reality and Immersive Collaborative Environments: the New Frontier for Big Data Visualisation

Alexander K. Sivitilli1 , Angus Comrie, Lucia Marchetti , Thomas H. Jarrett, 2019, ADASS XXI

Type: Poster
iDaVIE immersive Data Visualisation Interactive Explorer:  The aim of the iDaVIE software suite is to render datasets in a virtual room scale 3 D space where users can intuitively view and uniquely interact with their data in ways unafforded by conventional flatscreen and 2 D solutions.

In partnership between UCT Astronomy and IDIA, a laboratory for visual analytics has been created to develop and test hardware and software solutions for interactive visualization of large astronomical data sets. Central to the Visualization Lab is the Iziko Planetarium & Digital Dome, located in the heart of Cape Town. The fulldome facility is optimal for study and investigation of the largest-area data sets, including the Cosmic Web.