西藏物玛乡一带基于OLI数据遥感找矿模式研究

藏北为干旱地区稀疏植被覆盖度地区,基岩裸露程度较高,干扰因素较少,地质研究程度较低,结合最新时相OLI,通过研究测区各波段的相关系数,总结出了测区7、5、2波段为最佳波段组合。运用边缘增强技术,选择方向滤波增强线性构造,有选择性地增强线性构造体。结合研究区的岩石光谱特征,通过监督分类快速提取了测区侵入岩体信息。运用crosta法通过对（OLI2、OLI4、OLI5、OLI6）和（OLI2、OLI5、OLI6、OLI7）两组主成分分析提取铁质成分和OH^-,CO2^-3蚀变信息。最后对测区地质背景、成矿规律及成矿作用进行综合研究的基础上,总结出一套较科学、快速的遥感找矿模式。

REMOTE SENSING PROSPECTING MODEL BASED ON OLI DATA IN WUMA COUNTY OF TIBET

North Tibet is an arid area with sparse vegetation cover, it is favorite to geological survey by remote sensing survey due to bareness of bed rock and less interference factors. This paper summarized that band 7,5 and 2 are the best association for outlining geological object on image by studying the correlation coefficient of OLI data from different band. It is applied the margin highlighting method to highlight linear object, the rock spectrum for outlining intrusive rock, the crosta method for iron, OH^- and CO2^-3 alteration. Based on geological setting, metallogenic pattern and process, it summarized a fast remote sensing prospecting.