地学前缘 ›› 2016, Vol. 23 ›› Issue (3): 266-278.DOI: 10.13745/j.esf.2016.03.030

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基于Hapke辐射传输模型的月壤光谱模拟

赵哲，周萍，闫柏琨，王喆   

  1. 1. 中国地质大学(北京) 地球科学与资源学院, 北京 100083
    2. 中国国土资源航空物探遥感中心, 北京 100083
  • 收稿日期:2015-11-16 修回日期:2016-01-20 出版日期:2016-05-15 发布日期:2016-05-15
  • 通讯作者: 周萍（1964—），女，博士，副教授，主要从事高光谱遥感地学的教学及科研工作。
  • 作者简介:赵哲（1990—），男，硕士研究生，地质工程专业，主要研究方向遥感信息技术与地学应用。E-mail:zhaozhe@cugb.edu.cn
  • 基金资助:

    国家自然科学基金项目（41102208）；中国地质调查局项目“天山—北山重要成矿区带遥感调查”（121201003000150008）；中国地质调查局项目“地质勘查遥感系统集成与综合应用示范”（1212011120226）

Spectra simulation of lunar regolith based on the Hapke radiative transfer model

ZHAO Zhe, ZHOU Ping, YAN Bokun   

  1. 1. School of Earth Sciences and Resources, China University of Geosciences(Beijing), Beijing 100083, China
    2. China Aero Geophysical Survey and Remote Sensing Center for Land and Resources, Beijing 100083, China
  • Received:2015-11-16 Revised:2016-01-20 Online:2016-05-15 Published:2016-05-15

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摘要：

由于月球采样点较少，月壤真实数据稀缺，限制了对月球科学问题的进一步研究。较全面系统地采集月壤样品在近期很难完成，开展月壤光谱模拟工作是月壤实测光谱的必要有益补充，可以为研究月壤光谱特征提供大量数据。基于Hapke模型，我们选取RELAB光谱库的斜长石、单斜辉石、斜方辉石、橄榄石、单质铁、钛铁矿、火山玻璃、熔融玻璃等典型月壤矿物，运用牛顿插值和最小二乘优化的方法，模拟了LSCC月壤数据的一定粒径、单质铁含量、观测条件及矿物混合比例下的混合光谱。模拟光谱与实测光谱拟合较好，相关系数均大于0.99，均方根误差在10-3数量级；模拟矿物丰度与实测矿物丰度基本一致；模拟SMFe含量与相对成熟度指数Is/FeO线性关系明显；模拟粒径基本落在实测粒径组范围内。最后，文中讨论了光谱吸收中心波长、吸收面积等光谱特征参数的模拟精度，以及高精度模拟光谱时光学常数的计算方法。

关键词: Hapke模型, 月壤, 光谱模拟, 光学常数

Abstract:

Due to so few of landing site on the moon, the ground truth data of lunar soil is scarce, which limits the further study of the lunar science. Thus to carry out spectral simulation of lunar regolith is almost the only feasible way to research the spectral mechanism of lunar regolith and improve the reliability of composition inversion of lunar regolith, which also is essential and beneficial supplement to the measured spectra of lunar regolith. We selected plagioclase, clinopyroxene, orthopyroxene, olivine, metallic iron, ilmenite, volcanic glass and agglutinate acquired from RELAB spectral library as mineral endmembers, and simulated spectra of LSCC lunar regolith based on Hapke radiative transfer model, using Newton interpolation and least square optimization method. The simulated spectra and the measured spectra fits well with the correlation coefficients more than 0.99 and the root mean square error at the magnitude of 10-3. The simulated mineral abundance shows a good linear fitting with the measured abundance. The simulated SMFe content has a distinct linear relationship with the relative maturity index Is/FeO. The simulated particle size strictly falls within the measured particle size range. The simulation accuracy of spectral parameters, such as absorption center wavelength and absorption area, was discussed. We also discussed the calculation method of optical constants used for spectra simulation with high precision.

Key words: Hapke model, lunar soil, spectra simulation, optical constants

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