eng Science and Education Publishing Journal of Geosciences and Geomatics 2373-6704 2024-10-27 12 4 80 86 10.12691/jgg-12-4-1 JGG20241241 article F¨¦lix Nenadji Djerossem Djerossem@gmail.com 1 Ngarbagne Rirab¨¦ 1 Gustave Ronang Ba?ssemia 2 Moussa Ngarena Klamadji 2 Malik Hisseine Malik 3 4 Department of Mining, New and Renewable Energies. National Higher Institute of the Sahara and Sahel, Iriba, Chad Department of Mining and Geological Engineering, Faculty of Life and Earth Sciences, Pala University, P.O. Box. 20, Pala, Chad Laboratory of Geosciences, Natural Resources and Environment, University of Douala, BP: 44155, Douala, Cameroon Using Lansat-8 OLI/TIR image combined with field and pre-existing data permit us to create lineament and lithological map of Goz-Beïda area. The PCA images were subjected to Sobel directional filters using the semi-automatic extraction method to discriminate lineaments. By combining the 7/5/1 bands in RGB mode, the PCA images (PCA1, PCA2, PCA3) in RGB mode and the ratio bands 7/5, 4/5, 1/7 are used to discriminate the lithological types. The results show that the main lineaments are characterized by NE-SW and NNE-SSW directions. The N-S, ENE-WSW and NW-SE directions correspond to mean directions. Several lithological types are discriminated: two-mica quartzite, metapelite, pyroxene monzonite, biotite granite and two-mica leucogranite. The rocks types are partially covered by alluvial deposits. https://pubs.sciepub.com/jgg/12/4/1/jgg-12-4-1.pdf Goz-Be?da Landsat8 OLI/TIR Lineament map Lithological map and Eastern Chad