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Green Image
Issue No. 12 - Dec. (2012 vol. 18)
ISSN: 1077-2626
pp: 2275-2284
Daniel Engel , University of Kaiserslautern, Germany
Klaus Greff , University of Kaiserslautern, Germany
Christoph Garth , University of Kaiserslautern, Germany
Keith Bein , Air Quality Research Center (AQRC), University of California, Davis, CA, USA
Anthony Wexler , Air Quality Research Center (AQRC), University of California, Davis, CA, USA
Bernd Hamann , Institute for Data Analysis and Visualization (IDAV), University of California, Davis, CA, USA
Hans Hagen , University of Kaiserslautern, Germany
The study of aerosol composition for air quality research involves the analysis of high-dimensional single particle mass spectrometry data. We describe, apply, and evaluate a novel interactive visual framework for dimensionality reduction of such data. Our framework is based on non-negative matrix factorization with specifically defined regularization terms that aid in resolving mass spectrum ambiguity. Thereby, visualization assumes a key role in providing insight into and allowing to actively control a heretofore elusive data processing step, and thus enabling rapid analysis meaningful to domain scientists. In extending existing black box schemes, we explore design choices for visualizing, interacting with, and steering the factorization process to produce physically meaningful results. A domain-expert evaluation of our system performed by the air quality research experts involved in this effort has shown that our method and prototype admits the finding of unambiguous and physically correct lower-dimensional basis transformations of mass spectrometry data at significantly increased speed and a higher degree of ease.
Data visualization, Aerosols, Error analysis, Optimization, Atmospheric measurements, Mass spectroscopy, multidimensional data visualization, Dimension reduction, mass spectrometry data, matrix factorization, visual encodings of numerical error metrics

B. Hamann et al., "Visual Steering and Verification of Mass Spectrometry Data Factorization in Air Quality Research," in IEEE Transactions on Visualization & Computer Graphics, vol. 18, no. , pp. 2275-2284, 2012.
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