Abstract
Remotely sensing data include Landsat-8 Operational Land Imager (OLI) and Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER) data successfully delineated the alteration zone in Abu Marawat area. Image transformation technique was applied in the present study. Band ratio color composites (6/7, 6/5,*4/5, 5) and Principal Component Analysis (PCA) technique of Landsat-8 highlighted the alteration zone. Band ratio color composites ASTER bands 4/6, 4/2, and 4/3 in the R, G, and B, respectively, provided a significant results of alteration zone. Minimum Noise fraction technique (MNF) provided better results that clearly delineated the mineral potential area. Field data and previous works validated the alteration zones. The overall results showed the importance of image processing in showing the probable area of mineral resources.
Highlights
Advances in multispectral imaging systems include Landsat series and Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER) allowed mapping the geologic and structural features in fine resolutions (e.g., Abdelkareem and El-Baz, 2015 & 2016 & 2017)
ASTER aboard the Earth observation system (EOS) Terra platform measures the Electromagnetic (EM) waves in 14 spectral bands. This sensor has the advantage to cover the shortwave infrared (SWIR) which are significant to map several mineral groups include hydroxides, hydrates and carbonates (Abdelkareem and El-Baz, 2016). This allowed discriminating between key-alteration minerals such as kaolinite, smectite, alunite, and jarosite (Zhang et al, 2016; Yamaguchi and Naito, 2003; Pour and Hashim, IJARSG– An Open Access Journal (ISSN 2320 – 0243)
Abu Marawat area is located in the northern portion of the Central Eastern Desert of Egypt (Figure 1)
Summary
Advances in multispectral imaging systems include Landsat series and Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER) allowed mapping the geologic and structural features in fine resolutions (e.g., Abdelkareem and El-Baz, 2015 & 2016 & 2017). On February 11, 2013 the new Landsat Operational Land Imager (OLI) which aboard by Landsat-8 improved the spectral, radiometric and spatial resolutions of the acquired data This sensor measures the reflected electromagnetic waves in nine bands and measures the Thermal wavelengths in two bands (TIR). ASTER aboard the Earth observation system (EOS) Terra platform measures the Electromagnetic (EM) waves in 14 spectral bands This sensor has the advantage to cover the SWIR which are significant to map several mineral groups include hydroxides, hydrates and carbonates (Abdelkareem and El-Baz, 2016). This allowed discriminating between key-alteration minerals such as kaolinite, smectite, alunite, and jarosite (Zhang et al, 2016; Yamaguchi and Naito, 2003; Pour and Hashim, IJARSG– An Open Access Journal (ISSN 2320 – 0243). The aim of the present study is to apply OLI and ASTER data to map and highlight area of hydrothermal alteration zones as an indication of mineral resources in the arid regions
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