利用嫦娥一号IIM模拟数据提取月表矿物端元的精度分析

发布时间：2018-03-04 03:09

本文选题：月表　切入点：矿物　出处：《遥感学报》2012年06期 　论文类型：期刊论文

【摘要】：干涉型成像光谱仪(IIM)作为中国首颗探月卫星嫦娥一号上的重要载荷之一,已经获取了大量的月球高光谱数据。然而由于IIM数据的光谱范围被限定在480—960nm波谱范围内,很少覆盖月表矿物的波谱吸收特征,利用IIM数据反演月表矿物信息面临巨大挑战。当前月表地面调查数据或精细矿物分布制图还很缺乏,难以对反演或提取结果进行有效验证。本文利用月表4种主要矿物(斜长石、单斜辉石、橄榄石和钛铁矿)进行线性混合构建IIM模拟数据,分析月表矿物端元提取的精度,并对真实IIM数据进行了初步应用。根据斜长石和钛铁矿的不同组合比例分别模拟了月表的月海和高地,模拟数据还加入了与IIM真实数据分布趋势一致的随机噪声。基于4种端元提取算法(VCA、ICA、MVSA、SISAL)对模拟数据进行端元提取,并以光谱角距离(SAD)作为端元提取的精度评价准则。结果显示,MVSA和SISAL算法提取的所有矿物端元的光谱角距离都小于0.1,一般意味着矿物提取精度可以被接受。斜长石在各种算法下提取端元的光谱角距离都小于0.015;单斜辉石和钛铁矿提取端元的光谱角距离都小于0.1;橄榄石提取精度最差,在ICA算法下其光谱角距离高达0.34。
[Abstract]:As one of the important loads on Chang'e 1, an interferometric imaging spectrometer, a large amount of lunar hyperspectral data have been obtained. However, the spectral range of IIM data is limited to 480-960nm spectrum. The spectral absorption characteristics of monthly surface minerals are rarely covered, and it is a great challenge to use IIM data to retrieve monthly surface mineral information. At present, there is still a lack of surface survey data or fine mineral distribution mapping. It is difficult to verify the inversion or extraction results effectively. In this paper, linear mixing of four main minerals (plagioclase, clinopyroxene, olivine and ilmenite) is used to construct the IIM simulation data, and the accuracy of the extraction of the end components of the monthly surface minerals is analyzed. A preliminary application of the real IIM data is made. According to the different combination ratios of plagioclase and ilmenite, the lunar sea and the highland of the monthly table are simulated, respectively. Random noise is added to the simulation data, which is consistent with the distribution trend of IIM real data. And the spectral angular distance (sad) is used as the criterion for evaluating the accuracy of the end element extraction. The results show that the spectral angle distance of all minerals extracted by SISAL algorithm is less than 0.1, which generally means that the precision of mineral extraction is acceptable. Plagioclase. The spectral angular distance of the end member is less than 0.015 under various algorithms, the spectral angle distance of clinopyroxene and ilmenite is less than 0.1, and the extraction accuracy of olivine is the worst. Under ICA algorithm, the spectral angular distance is as high as 0.34.
【作者单位】：遥感科学国家重点实验室中国科学院遥感应用研究所;中国科学院研究生院;环境保护部南京环境科学研究所;巴基斯坦气象局;
【基金】：国家高技术研究发展计划(863计划)(编号:2009AA122203) 遥感科学国家重点实验室自由探索基金(编号:10ZY-04)~~
【分类号】：TP79;P184.5

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