ASTER Data Processing by Discrete Wavelets Transform and Band Ratio Techniques for the Identification of Lineaments and Hydrothermal Alteration Zones in Poli, North Cameroon

The aim of this study is to carry out hydrothermal alteration mapping and structural using ASTER images in order identify indices that could guide mining exploration work the Poli area its surroundings. To achieve this, were first preprocessed correct atmospheric effects remove vegetation influence. Secondly, a lineament was conducted by applying Discrete Wavelet Transform (DWT) algorithms First Principal Component Analysis (PCA1) Visible Near-Infrared (VNIR) Shortwave Infrared (SWIR) bands. Lastly, band ratio methods applied VNIR, SWIR, Thermal (TIR) bands determine iron oxides/hydroxides (hematite limonite), hydroxyl-bearing minerals (chlorite, epidote, muscovite), quartz index. results obtained showed lineaments mainly oriented NE-SW, ENE-WSW, E-W, with NE-SW being most predominant direction. Concerning alteration, identified covered almost entire strong correlation lithological data. Overlaying revealed significant between existing those observed field. Mineralized zones generally coincided areas high density exhibiting alteration. Based on mapping, can then be used as reference document for any area.