西准噶尔包古图Ⅴ号岩体围岩蚀变的特征及ETM+蚀变信息的提取
Wall rock alteration features and ETM+ alteration information extraction of Baogutu No.5 rock mass in western Junggar, Xinjiang, China
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摘要: 以新疆西准噶尔包古图Ⅴ号岩体为例，系统论述了包古图Ⅴ号含矿岩体的围岩蚀变分带和蚀变期次。结合ETM+数据的特征，选择多种遥感图像预处理方法组合，建立了基于典型蚀变矿物的特征光谱拟合技术的多光谱遥感蚀变信息提取模型，即遥感数据的归一化处理(Calibration )+掩膜(Mask)+混合像元分解(Endmember Unmixing)+波谱拟合(Spectral Feature Fitting)+ SAM+分类(分割)的CES模型。据此模型对岩体进行信息提取，并与化探资料叠加验证了该方法的可行性，取得了较满意的效果。Abstract: In this paper, Baogutu No.5 rock mass of Westtern Junggar in Xinjiang is taken as an example, wall rock alteration zoning and periodical pattern are systematically discussed, combined with ETM+ data, and with the help of remote sensing images pre-processing methods, a multi-spectral remote sensing alteration information extraction model based on spectral fitting technology of typical alteration minerals has been set up, namely CES model composed by remote sensing data calibration, mask, pixel unmixing, spectral fitting, SAM, Classification. Based on this model, information extraction has been conducted on the rock mass, and has been overlapped with geochemical data through which feasibility of this method has been validated, satisfactory results have been achieved.
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Keywords:
- wall rock alteration /
- spectral fitting /
- ETM+ /
- information extraction /
- western Junggar
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