A Comparative Analysis of Several Hyperspectral Methods in the Extraction of Altered Minerals：A Case Study of Laojinchang in Beishan Area
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摘要: 近年来，提出的多种高光谱分析方法已成功应用于蚀变矿物提取，但不同方法的提取效果存在差异。中国西北地区的蚀变矿物信息往往表现为微弱和难识别，因此如何定量对比不同分析方法的有效性值得探究。以北山老金厂的CASI-SASI机载高光谱数据为例，协同“最小噪声分离-纯净像元指数-n维可视化”技术，分析了高光谱数据进行降维去噪和纯净端元提取中的关键阈值。引入相似度增量和相关光谱区分熵，定量对比MTMF、SFF、SID、SAM、ACE 5种提取方法的有效性，并选择效果相对最佳的ACE方法提取实验区蚀变矿物信息，最后通过典型地质剖面验证的方式对结果进行检验。结果表明：MNF变换可以有效将波段按图像质量排序，实现数据降维和去噪声；而PPI算法运算时最佳阈值出现在迭代曲线变为趋于近似水平线的时候。几种方法中，ACE与MTMF法对光谱曲线细微变化的反应相对更灵敏，两者的对比指标也基本一致。野外地质剖面验证发现实验提取的蚀变矿物类型能够与地表蚀变地质体类型吻合，且矿床的围岩蚀变可以被蚀变矿物信息组合有效反应。研究结果可为西北戈壁荒漠区中蚀变矿物信息的提取及应用提供理论依据和技术参考。Abstract: Various hyperspectral analysis methods proposed in recent years have been successfully applied to the extraction of altered minerals, but the effects of different extraction methods vary differently. As information of altered minerals in Northwest China tends to be weak and hard to identify, how to quantitatively compare the effectiveness of different analysis methods is worth further investigation. Taking the CASI-SASI airborne hyperspectral data of Laojinchang in Beishan area as an example, the “minimum noise separation-pure pixel index-n-dimensional visualization” technology was used to analyze the key thresholds in the dimensionality reduction and denoising of hyperspectral data and the extraction of pure pixels. The authors quantitatively compared the effectiveness of five extraction methods (MTMF, SFF, SID, SAM and ACE) with the help of the similarity increment and spectral distinction entropy index. The ACE method, with a relatively better extraction effect, was selected to extract altered mineral information in the experimental area. The results were finally tested by means of typical geological section verification. The results show that the MNF transform can effectively sort the bands according to the image quality to achieve data dimensionality reduction and denoising; the optimal algorithm threshold of the PPI appears when the iterative curve becomes close to the horizontal line. Among the methods mentioned, the ACE and MTMF methods are more sensitive to slight changes in the spectral curve and the comparison indexes of the two methods are basically the same. Field verification of the geological section found out that the types of altered minerals extracted in experiments was consistent with the types of surface altered geological bodies, and the surrounding rock alteration of the deposit was effectively reflected by the altered mineral information combination. The research provides theoretical basis and technical reference for the extraction and application of altered mineral information in Gobi desert areas of Northwest China.
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Keywords:
- hyperspectral /
- altered mineral /
- information extraction method /
- contrastive analysis /
- Laojinchang
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