Principle Components Analysis of Martian Spectral Images

Details Principle Components Analysis of Martian Spectral Images Principle Components Analysis of Martian Spectral Images

Sep 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996dps....28.0321k&link_type=abstract

American Astronomical Society, DPS meeting #28, #03.21; Bulletin of the American Astronomical Society, Vol. 28, p.1069

Astronomy and Astrophysics

Astronomy

1

Scientific paper

We present preliminary Principle Components Analysis results from the 1995 infrared spectral imaging sets of Mars taken at the NASA Infrared Telescope Facility using NSFCAM. The PCA technique transforms the data set into a multi-dimensional space that maximizes the variance. We find that the first principle component corresponds to surface albedo and the second component has a spectral shape consistent with a fine-grained water ice. Three endmember spectra are then chosen from pixels representing the extreme values of the principle components and the image set is modeled as linear combinations of these spectra. The resulting fractional abundance map of the second principle component endmember (the North Polar Hood) has high values along the polar region, the evening limb and the morning hemisphere. We interpret this map to represent the water ice cloud cover. This interpretation correlates well with previously presented band-depth maps of water ice absorption features. Analysis of these spectral sets alone has so far detected no evidence for CO2 ice on the planet. This suggests that all of the cloud structures seen at mid- to low latitudes by HST are composed only of water ice. The apparent absence of any CO2 ice in the polar region may be due to the thickness of the North Polar Hood since the primary CO2 band at 3.33 microns could be obscured by a saturated water band throughout the 3-4 microns region.

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