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JOURNAL OF GEOPHYSICAL RESEARCH,
VOL. 114,
E08001,
11 PP., 2009
doi:10.1029/2008JE003250
Automated classification of visible and infrared spectra using cluster analysis
Space Science and Astrobiology Division, NASA Ames Research Center, Moffett Field, California, USA
Space Science and Astrobiology Division, NASA Ames Research Center, Moffett Field, California, USA
Bay Area Environmental Research Institute, NASA Ames Research Center, Moffett Field, California, USA
Planetary space experiments collect large volumes of data whose scientific content requires understanding. Marzo et al. (2006) presented an unsupervised cluster analysis scheme that is able to reduce a spectral data set to a few clusters, allowing for more focused and rapid evaluation of their scientific meaning. Here, we extend the original approach to account for the measurement uncertainty and build a classification scheme. We apply the clustering technique to the ASTER and RELAB libraries of visible and infrared spectral reflectance. These spectral libraries are documented, allowing assignment of a label to each spectrum reflecting its physical and chemical properties. We assess the ability of the original and extended approaches to identify natural clusters of the library spectra and estimate associated uncertainties of the results. We evaluate the scientific meaning of the derived clusters based on the labels contained within each cluster. Once the cluster meanings are defined, we test our classification scheme using a training-testing approach and evaluate the accuracy of assigning the unknown spectra to the correct cluster.
Received 10 August 2008; accepted 5 May 2009; published 11 August 2009.
Citation: (2009), Automated classification of visible and infrared spectra using cluster analysis, J. Geophys. Res., 114, E08001, doi:10.1029/2008JE003250.
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