The contribution
of landsat 8 oli multispectral data to the lithological mapping of the Ait Ourir
basin (Western High Atlas, Morocco)
Nidsaid Zaina, Algouti Ahmed, Algouti Abdellah, Hadach Fatiha and Moujane Said
Disaster Advances; Vol. 15(6); 23-32;
doi: https://doi.org/10.25303/1506da023032; (2022)
Abstract
The present work consists in identifying the geological facies and defining the
dominant orientation of the lineaments in order to improve the knowledge on the
local geodynamics in the Northern Sub-Atlasic zone of the Marrakesh High Atlas,
the Ait Ourir basin region, The latter is characterized by a post-Hercynian Mesozoic
cover folded into broad synclines with flat and subhorizontal bottom, separated
by ejective and sharp anticlines. For this purpose, multispectral data from Landsat
8 operational land imager (OLI) have been applied in a platform of ArcGIS software
and through the treatments offered by this software, namely, the principal component
analysis (PCA), the band ratios (BR) and the transformation of the minimum noise
fraction (MNF), a better lithological discrimination and description was brought
to the set of geological formations that form the studied basins.
In parallel, the results obtained by the method of classification by Support Vector
Machine (SVM), which is based on the joint use of geomorphic features, textures
and multispectral data from Landsat 8 satellite, showed an excellent correlation.
With the simplified geological map of the northern slope of the High Atlas of Marrakesh
(1/10000) and field data from the study area. The result shows an overall accuracy
of classification of Landsat8 OLI data by SVM which is 96.64% and the Kappa coefficient
which is 0.98 and a positive correlation is shown between lineament structures and
dominant orientations of the extracted lineaments. The highest densities obtained
are N-S, NE-SW and NNE-SSW oriented with the predominance of the first direction.
