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在冰雪覆盖的高山地区 ,蚀变岩反射光谱信息被高山上的冰雪和河谷中砂石等强反射率信息所抑制。TM6波段反映热红外发射光谱信息 ,根据温度差异反映不同的目标 ,对岩性区分有较好的效果。研究了在TM6波段信息的基础上 ,利用Gram -Schmidt投影方法将反射光谱信息叠加到TM6波段上进而进行弱信息提取的方法。这一方法在新疆康西瓦地区得到成功利用。
In snow-covered alpine regions, the information of altered rock reflectance spectra is suppressed by strong reflectivity information such as glaciers and valleys in the mountains. TM6 band reflects the thermal infrared emission spectral information, reflecting different targets according to the temperature difference, which has good effect on lithology differentiation. Based on the information of TM6 band, a method of using Gram-Schmidt projection method to superimpose the reflected spectral information on the TM6 band to extract weak information is studied. This method has been successfully used in Kangxiwa area of Xinjiang.