基于高光谱的高海拔地区矿物信息提取与分析  

The Alteration Mineral Information Extraction and Analysis of Hyperspectral data in High-Altitude Area

作　　者：杨燕杰[1] YANG Yanjie(National Key Laboratory of Remote Sensing Information and Image Analysis Technique Beijing Research Institute of Uranium Geology,CNNC,Beijing 100029,China)

机构地区：[1]核工业北京地质研究院遥感信息与图像分析技术国家级重点实验室,北京100029

出　　处：《世界核地质科学》2023年第4期1020-1028,共9页World Nuclear Geoscience

基　　金：遥感信息与图像分析技术国家级重点实验室基金项目(编号:6142A01220401)资助。

摘　　要：为了更好地服务于高海拔地区的矿产勘查,研究适用于相关矿物的提取方法,在青海格尔木市纳赤台地区开展高光谱矿物信息提取试验。根据已知地质资料中与矿点相关的蚀变矿物类型,确定高光谱影像中提取矿物的类型,然后分析相应矿物的光谱特征。利用航空成像光谱仪SASI获取高光谱影像数据,采用光谱特征匹配方法提取了孔雀石、绿泥石和白云石等矿物信息。将蚀变矿物信息提取结果与已知矿点、异常点进行空间叠加分析,总结蚀变矿物与已有矿点、异常点的空间关系。发现铜矿及异常点周边分布大量的孔雀石和绿泥石,玉石矿周边分布大量的白云石,经验证信息提取结果,精度在90%以上。根据已知矿点或异常点与蚀变矿物的关系以及蚀变矿物的空间分布规律,白云石与玉石矿在研究区具有很强的相关性,据此预测了铜矿和玉石矿的未来重点勘查区,为矿产勘查提供了技术支撑。In order to better serve mineral exploration in high⁃altitude areas and study extraction methods applicable to related minerals,the hyperspectral mineral information extraction experiment was conducted in the Nachitai area of Golmud City,Qinghai.This area is of high altitude,sparsely populated,deep cutting,harsh natural conditions and difficult to obtain systemical dteration mineral distribution information with ground sampling and observation.Based on the geology information of the study area,the mineral type was extracted from hyperspectral images was decided.The spectral characteristic of those mineral types were analyzed from the hyperspectral images.The hyperspectral image information extraction type is mainly based on the local known alteration types.For the verification of information extraction results,the combination of geological data and field spectral measurement is used to improve the efficiency of verification.According to the spectral characteristics of various minerals,the corresponding spectral matching extraction method was selected.The rock type was determined by matching the field spectral curve with the general spectrum,and then the homonymous feature points are found in the SASI image according to the field collected rock spectrum,and then the spectral curve of the homonymous feature points in the image was used to extract this type of rock information.On this basis,the mineral distribution map of the study area is compiled.The malachite,chlorite and dolomite information were extracted based on the SASI hyperspectral images and spectral characteristic match method.The mineral information was overlaid to the geology map for conclude the spatial relationship between the alteration mineral and the mine or mineral abnormal point.There were a lot of malachite and chlorite around the copper mine and a lot of dolomite around the jade ore.The accuracy is more 90 percent after field checked.The key exploration area of the copper and the jade were forecasted base the spatial relationship between the

关 键 词：高光谱 铜矿 孔雀石 高海拔 

分 类 号：P627[天文地球—地质矿产勘探]