地质学报2024，Vol.98Issue(1)：314-323,10.DOI:10.19762/j.cnki.dizhixuebao.2023040
基于多角度高光谱指数的花岗岩中长石含量反演研究
Inversion of feldspar content in granite based on hyperspectral indices developed from multi-angular bidirectional reflectance
摘要
Abstract
The quantitative estimation of feldspar content in granites is helpful for the naming and classification of granites,and it provides basic data for subsequent studies on related geological processes.However,within the visible near-infrared to short-wave infrared range(0.35～2.5 μm),the traditional method of inverting rock types and mineral contents based on spectral absorption characteristic parameters is not suitable for minerals such as feldspar that lack diagnostic absorption characteristics.At the same time,the complexity of calculating the radiative transfer model based on physics limits the application of this method to a large extent in the inversion of rock mineral properties.In this paper,we establish a spectral index model for estimating the proportion of plagioclase to feldspar in granite based on multi-angle hyperspectral data.By combining different spectral preprocessing methods and spectral index types,we aim to overcome these limitations.Our results show that the double differences type index model,utilizing the measured dataset with continuum removal at the 2035 nm band(CRDDn203s),demonstrates good performance across different measured datasets,achieving an estimation accuracy of 0.81.Through the study,we establish a spectral index model for estimating the proportion of plagioclase in granite,providing a new technical method and idea for the quantitative inversion of rock and ore information with weak absorption characteristics.关键词
多角度高光谱数据/光谱指数/花岗岩中长石定量反演/Hapke模型Key words
multi-angular hyperspectral data/spectral index/quantitative inversion of feldspar in granite/Hapke model引用本文复制引用
吴梦娟,靳佳,王金林,王权..基于多角度高光谱指数的花岗岩中长石含量反演研究[J].地质学报,2024,98(1):314-323,10.基金项目
本文为广西科技基地和人才专项(编号桂科AD22035922)和新疆重大科技专项(编号2021A03001-3)联合资助的成果. （编号桂科AD22035922）
