Per-pixel and sub-pixel mapping of alteration minerals associated with geothermal systems using ASTER SWIR data

9th IGRSM International Conference and Exhibition on Geospatial & Remote Sensing

地球科学;计算机科学

Abubakar, Aliyu Ja'Afar^1,3 ; Hashim, Mazlan^1 ; Pour, Amin Beiranvand^1,2 ; Musa, Sulaiman Ibrahim^1 ; Amusuk, Danboyi Joseph^1

Geoscience and Digital Earth Centre (INSTeG), Research Institute for Sustainability and Environment (RISE), Universiti Teknologi Malaysia (UTM), Malaysia^1

Korea Polar Research Institute (KOPRI), Songdomirae-ro, Yeonsu-gu, Incheon

21990, Korea, Republic of^2

Department of Geography, Faculty of Science, Kaduna State University, P.M.B. 2339, Kaduna, Nigeria^3

关键词: Geothermal systems;    Image spectral analysis;    Sampling points;    Short wave infrared;    Spectral mappings;    Sub-pixel mapping;    Subpixel algorithms;    Thermal emissions;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/169/1/012086/pdf
DOI  :  10.1088/1755-1315/169/1/012086

学科分类：计算机科学（综合）

来源: IOP

【 摘 要 】

This paper is focused on assessing the applicability of the Advanced Space-borne Thermal Emission and Reflection Radiometer (ASTER) shortwave infrared data in proxy mapping of subtle geothermal (GT) systems by identifying hydrothermally altered indicator minerals. The study was carried out at Yankari Park NE Nigeria. Spectral mapping is applied on ASTER data using perpixel and subpixel algorithms to extract and discriminate associated altered areas of interest. Field checks and altered rock sampling was done using GPS around the Wikki and Mawulgo thermal springs to validate results. Sampling points were used as training sites for image spectral analysis. X-Ray Diffraction results shows presence of kaolinite, quartz, hematite and dickite. This investigation demonstrates the utility of alteration mapping as a tool for GT resource exploration in uncharted regions.