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Thesis Defense - Gruchalla

Progressive Visualization-Driven Multivariate Feature Definition and Analysis
Computer Science PhD Candidate
8/17/2009
1:00pm-3:00pm

One of the barriers to visualization-enabled scientific discovery is the difficulty in clearly and quantitatively articulating the meaning of a visualization, particularly in the exploration of relationships between multiple variables in large-scale data sets. This issue becomes more complicated in the visualization of three-dimensional turbulence, since geometry, topology, and statistics play complicated, intertwined roles in the definitions of the features of interest, making them difficult or impossible to precisely describe.

This dissertation develops and evaluates a novel interactive multivariate volume visualization framework that allows features to be progressively isolated and defined using a combination of global and feature-local properties. I argue that a progressive and interactive multivariate feature-local approach is advantageous when investigating ill-defined features because it provides a physically meaningful, quantitatively rich environment within which to examine the sensitivity of the structure properties to the identification parameters. The efficacy of this approach is demonstrated in the analysis of vortical structures in Taylor-Green turbulence. Through this analysis, two distinct structure populations have been discovered in these data: structures with minimal and maximal local absolute helicity distributions. These populations cannot be distinguished via global distributions; however, they were readily identified by this approach, since their feature-local statistics are distinctive.

Committee: Elizabeth Bradley, Professor (Chair)
Clayton Lewis, Professor
Michael Eisenberg, Professor
Mark Rast, Department of Astrophysical and Planetary Sciences
Alan Norton, National Center for Atmospheric Research
Department of Computer Science
University of Colorado Boulder
Boulder, CO 80309-0430 USA
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