哈密黑山口地区遥感蚀变信息提取特征波段优选研究

[摘 要] 在遥感蚀变信息提取研究中,特征波段的选取是主要的技术关键。本文以新疆哈密市黑山口地区为研究区,利用ETM 卫星遥感数据,在光谱数据空间几何结构特征分析的基础上,通过对七个多光谱波段的回归偏度分析,评价蚀变信息的客观存在性,从而选取出针对不同蚀变类型的特征波段,然后采用主成分分析、最优密度分割等方法,提取出矿化蚀变信息,并对结果信息进行了评价。通过野外地质调查和光谱测量的实地验证,提取的蚀变信息与实地情况吻合性好,取得了较理想的效果。结论认为,次级断裂构造带上含矿化蚀变的铁镁质岩体找矿前景较好。

Selection of Characteristic Bands in Alteration Information Extraction fromRemote Sensing Images for the Heishankouyong Area, Hami, Xinjiang

Selection of characteristic bands is a critical process for extracting mineral alteration information from remote sensing images.Taking the Heishankou area in Hami of Xinjiang as an example,we make geometric structural analysis of spectral data space and use ETM data to study the partial regression of the 7 ETM bands,and to evaluate mineral alteration information from these data.Then we select the characteristic bands for varied alteration types to extract alteration information,and use the principal component analysis method and the optimal density separation method to extract mineral alteration information.Field geological survey and spectral measurements prove that the extracted alteration information is consistent with the real situation,indicating the ideal result of this method.And this work suggests that the mineralized alteration-bearing ferruginous rock bodies on the secondary fault zone shows a good prospecting potential.