Towards high-dimensional data analysis in air quality research

D. Engel, M. Hummel, F. Hoepel, K. Bein, A. Wexler, C. Garth, B. Hamann, H. Hagen

Research output: Contribution to journalArticlepeer-review

2 Scopus citations


Analysis of chemical constituents from mass spectrometry of aerosols involves non-negative matrix factorization, an approximation of high-dimensional data in lower-dimensional space. The associated optimization problem is non-convex, resulting in crude approximation errors that are not accessible to scientists. To address this shortcoming, we introduce a new methodology for user-guided error-aware data factorization that entails an assessment of the amount of information contributed by each dimension of the approximation, an effective combination of visualization techniques to highlight, filter, and analyze error features, as well as a novel means to interactively refine factorizations. A case study and the domain-expert feedback provided by the collaborating atmospheric scientists illustrate that our method effectively communicates errors of such numerical optimization results and facilitates the computation of high-quality data factorizations in a simple and intuitive manner.

Original languageEnglish (US)
Pages (from-to)101-110
Number of pages10
JournalComputer Graphics Forum
Issue number3 PART1
StatePublished - Jun 2013

ASJC Scopus subject areas

  • Computer Networks and Communications


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