Hyperspectral analysis of lithologies in the Arctic in areas with abundant lichen cover

Q2 Earth and Planetary Sciences

Geological Survey of Denmark and Greenland Bulletin Pub Date : 2018-08-15 DOI:10.34194/geusb.v41.4341

S. Salehi

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引用次数: 6

Abstract

Lithological mapping using remote sensing depends, in part, on the identification of rock types by their spectral characteristics. Chemical and physical properties of minerals and rocks determine their diagnostic spectral features throughout the electromagnetic spectrum. Shifts in the position and changes in the shape and depth of these features can be explained by variations in chemical composition of minerals. Detection of such variations is vital for discriminating minerals with similar chemical composition. Compared with multispectral image data, airborne or spaceborne hyperspectral imagery offers higher spectral resolution, which makes it possible to estimate the mineral composition of the rocks under study without direct contact. Arctic environments provide challenging ground for geological mapping and mineral exploration. Inaccessibility commonly complicates ground surveys, and the presence of ice, vegetation and rock-encrusting lichens hinders remote sensing surveys. This study addresses the following objectives: 1. Modelling the impact of lichen on the spectra of the rock substrate; 2. Identification of a robust lichen index for the deconvolution of lichen and rock mixtures and 3. Multiscale hyperspectral analysis of lithologies in areas with abundant lichens.

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北极地衣覆盖丰富地区岩性的高光谱分析

利用遥感进行岩性测绘，在一定程度上取决于根据岩石的光谱特征来确定岩石类型。矿物和岩石的化学和物理性质决定了它们在整个电磁波谱中的诊断光谱特征。这些地物的位置、形状和深度的变化可以用矿物化学成分的变化来解释。检测这种变化对于鉴别化学成分相似的矿物是至关重要的。与多光谱图像数据相比，机载或星载高光谱图像具有更高的光谱分辨率，可以在不直接接触的情况下估计所研究岩石的矿物成分。北极环境为地质测绘和矿产勘探提供了具有挑战性的基础。难以接近通常使地面调查复杂化，冰、植被和岩石覆壳地衣的存在阻碍了遥感调查。本研究的目的如下:模拟地衣对岩石基质光谱的影响;2. 2 .确定地衣与岩石混合物反褶积的可靠地衣指数;地衣丰富地区岩性的多尺度高光谱分析。

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来源期刊

Geological Survey of Denmark and Greenland Bulletin GEOLOGY-

CiteScore

2.30

自引率

0.00%

发文量

审稿时长

>12 weeks

期刊介绍： GEUS Bulletin publishes geoscience research papers, monographs and map descriptions with a focus on Denmark, Greenland and the wider North Atlantic and Arctic region. We welcome submissions that fit this remit. Specifically, we publish: 1.Short articles intended as rapid communications that are of immediate interest to the international geoscience community (these include new research, datasets, methods or reviews) 2.Regular-length articles that document new research or a review of a topic of interest 3.Monographs (single volume works, by arrangement with the editorial office) 4.Maps and descriptive texts (produced by GEUS for Greenland and Denmark, by arrangement with the editorial office) GEUS Bulletin serves a broad geoscientific readership from research, industry, government agencies, NGOs and special interest groups.