基于Hapke模型混合岩矿粉末反射率光谱模拟

发布时间：2018-11-06 11:20

【摘要】：Hapke岩矿二向反射率光谱定量模型是研究混合矿物光谱的有利工具,而国内对该模型的基础研究较少。通过4组室内混合矿物光谱数据来研究该模型在模拟混合矿物光谱时的准确性与存在的问题,进而探讨混合矿物光谱的特征规律。研究表明,在模拟混合矿物光谱方面不论是各向同性,还是各向异性的Hapke模型均有很高的精度,权重调整后4组各向同性模型的模拟结果均方根误差(RMSE)均值为0.014 4,相关系数(R)均值为0.994 7,4组各向异性模型的模拟结果 RMSE均值为0.008 4,R均值为0.994 4,说明该模型是优异的混合光谱分析手段;但模型对暗色矿物适用性较差,如当混合矿物中含有黑云母时模拟精度较低;混合矿物的光谱谱形需要针对矿物组成进行具体分析,其中所占质量分数较高的矿物并不一定能主导混合矿物的光谱谱形,而低反射率的矿物在混合矿物光谱中发挥的作用远大于其质量分数的比重。
[Abstract]:The quantitative model of bidirectional reflectance spectrum of Hapke rock and ore is an advantageous tool for studying the spectrum of mixed minerals, but the basic research on this model is less in China. The accuracy and existing problems of the model in simulating the spectra of mixed minerals were studied by four sets of indoor mixed mineral spectral data, and the characteristics of the spectra of mixed minerals were discussed. The results show that both isotropic and anisotropic Hapke models have high accuracy in simulating the spectra of mixed minerals. The (RMSE) mean value of root-mean-square error (RMS) of the four isotropic models after weight adjustment is 0.014. The average correlation coefficient (R) is 0.994 and the average value of the four anisotropic models is 0.994. The simulation results show that the RMSE mean value is 0.008 4 and R is 0.994 4, which indicates that the model is an excellent mixed spectral analysis method. However, the model is less suitable for dark minerals, for example, when the mixed minerals contain biotite, the simulation accuracy is low. The spectral form of mixed minerals needs to be analyzed in detail according to the mineral composition, in which the mineral with high mass fraction does not necessarily dominate the spectral form of the mixed mineral. The effect of low reflectivity minerals on the spectrum of mixed minerals is much larger than the specific gravity of their mass fraction.
【作者单位】：中国国土资源航空物探遥感中心;河北省煤田地质局;
【基金】：中国地质调查局地质调查项目“高光谱地质调查技术方法研究”(编号:12120115040801)资助
【分类号】：P627

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