摘要
层状硅酸盐矿物光谱曲线特征具有较大相似性,在以往可见光-近红外遥感中的区分提取难度较大。本文采用的加拿大先进的热红外航空成像光谱仪(Thermal Airborne Hyperspectral Imager,简称TASI),可获取具有高分辨率的热红外高光谱数据。基于TASI数据并利用热红外波段的发射率光谱可探测出矿物Si-O键振动特征的优势,可做到矿物亚类的区分识别和矿物丰度信息的提取,使硅酸盐矿物亚类中的层状硅酸盐矿物区分提取的精确性得以提高。本文对甘肃北山柳园工作区进行了基于发射率光谱特征的层状硅酸盐蚀变矿物提取实验。通过分析从图像获取的端元光谱曲线特征,并与ASU光谱库标准光谱曲线进行对比,确定目标端元,成功区分出了绿泥石、高岭石等层状硅酸盐矿物,经野外实地验证后,确认所提取信息精确性较高。
It's rather difficult to extract phyllo-silicate minerals through visible and near-infrared method due to its high similitude in spectrum. To solve this problem, we put TASI, the advanced Thermal Airborne Hyperspectral Imager of Canada, into use to obtain the thermal infrared hyperspectral data with high resolution. Using the spectrum of emissivity based on TASI data is of great advantage. It is available to detect the curve feature caused by the oscillation of Si-O bond in phyllosillicate minerals, which identifying the sub-types of minerals and acquiring its abundance both allowed. It's a superiority which improved the accuracy of identifying phyllosillicates, the sub-types of sillicate minerals. We experiment on the extraction of phyllosillicate alternation minerals based on the curve features in spectrum of emissivity and complete the mapping of alteration in Liuyuan, Gansu province. By analyzing the spectral curve features of the images' endmember and identified Chlorite, Kaolinite and other phyllosillicate minerals successfully. Alteration extracted through the experiment is accurate and coincide with the verification results of the field study.
出处
《国土资源信息化》
2015年第2期32-37,共6页
Land and Resources Informatization
基金
热红外高光谱矿化蚀变矿物提取方法研究与应用示范(编号:12120113099600)
关键词
遥感地质
硅酸盐矿物
热红外高光谱
蚀变提取
Remote sensing geology
Silicate minerals
Thermal infrared Hyper spectral
Alteration mineral mapping
