A Spectral Unmixing Method of Estimating Main Minerals Abundance of Lunar Soils
YAN Bo-kun1, LI Jian-zhong2, GAN Fu-ping1, YANG Su-ming1, WANG Run-sheng1
1. China Aero Geophysical Survey and Remote Sensing Center for Land and Resources, Beijing 100083, China 2. School of Earth Sciences and Resources, China University of Geosciences, Beijing 100083, China
Abstract:Estimating minerals abundance from reflectance spectra is one of the fundamental goals of remote sensing lunar exploration, and the main difficulties are the complicated mixing law of minerals spectrum and spectral features being sensitive to several kinds of factors such as topography, particle size and roughness etc. A method based on spectral unmixing was put forward and tested in the present paper. Before spectra are unmixed the spectral continuum is removed for clarifying and strengthening spectral features. The absorption features and reflectance features (the upward curving parts of spectra between absorption features) are integrated for unmixing to improve the unmixing performance. The Hapke model was used to correct unmixing error due to nonlinear mixing of minerals spectra. Forty three mixed spectra of olivine, clinopyroxene, hypersthene and plagioclase were used to validate the above method. The four minerals abundance was estimated under the conditions of being unaware of endmember spectra used to mix, granularity and chemical composition of minerals. Residual error, abundance error and correlation coefficient between retrieved and true abundance were 5.0 Vol%, 14.4 Vol% and 0.92 respectively. The method and result of this paper could be referred in the lunar minerals mapping of imaging spectrometer data such as M3.
闫柏琨1, 李建忠2, 甘甫平1, 杨苏明1, 王润生1 . 一种月壤主要矿物组分含量反演的光谱解混方法 [J]. 光谱学与光谱分析, 2012, 32(12): 3335-3340.
YAN Bo-kun1, LI Jian-zhong2, GAN Fu-ping1, YANG Su-ming1, WANG Run-sheng1 . A Spectral Unmixing Method of Estimating Main Minerals Abundance of Lunar Soils . SPECTROSCOPY AND SPECTRAL ANALYSIS, 2012, 32(12): 3335-3340.
[1] Clark R N, Swayze G A, Livo K E, et al. Journal of Geophysical Research, 2003, 108(E12): 5. [2] Hapke B. Journal of Geophysical Rearch, 1981, 86: 3039. [3] Hapke B, ICARUS, 2002, 157: 523. [4] Cahill J T, Lucey P G. Journal of Geophysical Research, 2007, 112(E10007): 1. [5] Lawrence S J, Lucey P G. Journal of Geophysical Research, 2007, 112(E07005): 1. [6] Denevi B W, Lucey P G, Sherman S B. Journal of Geophysical Research, 2008, 113(E02003): 1. [7] Cahill J T, Lucey P G, Wieczorek M A. Journal of Geophysical Research, 2009, 114(E09001): 1. [8] Yan B K, Wang R S, Gan F P, et al. ICARUS, 2010, 208: 11. [9] Pitman K M, Wolff M J, Clayton G C. Journal of Geophysical Research, 2005, 110(E08003): 1. [10] YAN Bo-kun, CHEN Wei-tao, WANG Run-sheng, et al(闫柏琨,陈伟涛,王润生,等). Earth Science-Journal of China University of Geoscience(地球科学—中国地质大学学报), 2009, 34(6): 946. [11] Lucey P G. Journal of Geophysical Research, 1998, 103(E1): 1703. [12] Clark R N, Roush T L. Journal of Geophysical Research, 1984, 89(B7): 6329. [13] Mustard J F, Pieters C M. Journal of Geophysical Research, 1989, 94(B10): 13619. [14] Yan B K, Wang R S, Guo X F. SPIE, 2008, 7123: 1. [15] Pieters C M, Hiroi T. Lunar and Planet Science 35, 2004, Abstract 1720. [16] OUYANG Zi-yuan(欧阳自远). Introduction to Lunar Science(月球科学概论). Beijing: China Astronautic Publishing House(北京:中国宇航出版社), 2005. [17] WU Yun-zhao, ZHENG Yong-chun, ZOU Yong-liao, et al(吴昀昭,郑永春,邹永廖,等). Journal of Space Science(空间科学学报), 2010, 30(2): 154. [18] Nobel S K, Pieters C M, Clayton G C. Journal of Geophysical Research, 2007, 110(E08003): 1. [19] Moroz L V, Basilevsky A T, Hiroi T, et al. ICARUS, 2009, 202: 336. [20] ZHENG Yong-chun, WANG Shi-jie, FENG Jun-ming, et al(郑永春, 王世杰, 冯俊明,等). Acta Mineralogica Sinica(矿物学报), 2007, 27(3): 571.