Lithologic Unit Mapping Based on Omega/mars Express Data
نویسندگان
چکیده
This paper develops a procedure for mapping Martian lithologic units, using the OMEGA/Mars Express data. The procedure consists of correcting Martian atmospheric absorptions based on an empirical transmission function method, noise-free principle components analysis based on a minimum noise fraction (MNF) method, lithologic unit delineation, and spectral matching of the units to spectral libraries using spectral feature fitting (SFF) and spectral angle mapper (SAM) methods. Two areas, Meridiani Planum and OphirCandor Chasma for their mostly-known lithologic and chemical compositions, were chosen for testing the approach. It is found that the MNF band 1 (accounting for ~50% of total information from 114 bands between 0.926 to 2.55 μm) is mostly correlated (positively or negatively) to the albedo (correlation coefficient r up to 0.83 0.98) of the OMEGA imagery, while the MNF bands 2, 3, and 4 contain most lithological information for making an informative and useful geologic unit map. The two spectral matching methods (SFF and SAM) emphasize different criteria and should be used together to achieve confident results. * Minqiang Zhu. Digital Land Key Lab of Jiangxi, East China Institute of Technology, 56# Xuefu Road, Fuzhou, Jiangxi 344000, China. E-mail: mqzhu @ecit.edu. cn.
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