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首页> 外文期刊>Journal Of The South African Institute Of Mining & Metallurgy >Mapping hydrothermal minerals using remotely sensed reflectance spectroscopy data from Landsat
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Mapping hydrothermal minerals using remotely sensed reflectance spectroscopy data from Landsat

机译：使用来自Landsat的远程感测的反射光谱数据来映射水热矿物质

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摘要

Mapping of hydrothermally altered areas, which are usually associated with mineralization, is essential in mineral exploration. In this research, open source reflectance spectroscopy data from the multispectral moderate-resolution Landsat 8 satellite was used to map altered rocks in the Gauteng and Mpumalanga provinces of South Africa. The unique spectral reflectance and absorption characteristics of remotely sensed Landsat data in the visible, near-infrared (NIR), shortwave-infrared (SW1R) and thermal infrared (TIR) regions of the electromagnetic spectrum were used in different digital image processing techniques. The band ratios (red/blue, SWIR 2/NIR, SWIR 1/NIR), spectral band combinations (Kaufmann ratio, Sabins ratio) and principal component analysis (Crosta technique) were applied to efficiently and successfully map hydrothermal alteration minerals. The results showed that the combination of spectral bands and the principal component analysis method is effective in delineating mineral alteration through remotely sensed satellite data. The validation of results by using the published mineral maps of the Council for Geoscience South Africa showed a good relationship with the identified zones of mineralization. The methodology developed in this study is cost-effective and time-saving, and can be applied to inaccessible and/or new areas with limited ground based knowledge to obtain reliable and up-to-date mineral information.
机译：水热改变的区域，通常与矿化有关的地区，对于矿物勘探至关重要。在这项研究中，来自多光谱中央分辨率Landsat 8卫星的开源反射谱数据用于绘制豪登省南非豪登省省的改变岩石。在不同的数字图像处理技术中使用了可见光，近红外（NIR），短波红外（NIR），短波红外（SW1R）和热红外（TIR）区域中的远程感测的LANDSAT数据的独特光谱反射和吸收特性。带比（红色/蓝，SWIR 2 / NIR，SWIR 1 / NIR），光谱带组合（Kaufmann比，Sabins比率）和主要成分分析（克罗斯科技术）用于有效，成功地映射水热改变矿物。结果表明，光谱带和主成分分析方法的组合是通过远程感测卫星数据描绘矿物改变的有效性。通过使用地球科学委员会委员会的发布矿物地图的验证表现出与矿化区的良好关系。本研究中开发的方法是具有成本效益和节省时间的，并且可以应用于基于地面有限的知识的无法访问和/或新的区域，以获得可靠和最新的矿物信息。

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