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Joint Contour Nets: Theory & Applications

Thursday, October 11, 2012 -
2:00pm to 2:50pm
ALS 4001

Speaker Information

Dr. Hamish Carr
Senior Lecturer
University of Leeds


<p>As scientific data sets increase in size and complexity, scientific visualization increasingly depends on formal analysis of the data. One of the most successful forms of analysis uses computational topology to <span data-scayt_word="analyse" data-scaytid="2">analyse</span> properties such as minima, maxima, thresholds, ridges and flow. To date, however, these methods have been applied to <span data-scayt_word="univariate" data-scaytid="3">univariate</span> (scalar) fields and to vector fields, but not to the more general case of multivariate fields.</p><p>In particular, Contour Trees and <span data-scayt_word="Reeb" data-scaytid="5">Reeb</span> Graphs are often used for <span data-scayt_word="analysing" data-scaytid="6">analysing</span> <span data-scayt_word="univariate" data-scaytid="4">univariate</span> (scalar) fields. We generalize this analysis to multivariate fields with a data structure called the Joint Contour Net that <span data-scayt_word="quantizes" data-scaytid="8">quantizes</span> the variation of multiple variables simultaneously. We report the first algorithm for constructing the Joint Contour Net, and demonstrate some of its fundamental properties. Based on this, we also show some preliminary results on its use for visualization by applying it to a problem from nuclear fission analysis, in which the topological insight provided aided scientists in understanding a physical phenomenon.</p>

Speaker Bio

Hamish Carr completed his PhD at the University of British Columbia in May 2004 and has worked as a lecturer at University College Dublin and a senior lecturer at the University of Leeds. His research interests include scientific and medical visualization, computational geometry and topology, computer graphics and geometric applications.