Abstract
This paper presents a lineament detection method using multi-band remote sensing images. The main objective of this work is to design an automatic image processing tool for lineament mapping from Landsat-7 ETM + satellite data. Five procedures were involved: 1) The Principal Component Analysis; 2) image enhancement using histogram equalization technique 3) directional Sobel filters of the original data; 4) histogram segmentation and 5) binary image generation. The applied methodology was contributed in identifying several known large-scale faults in the Northeast of Tunisia. The statistical and spatial analyses of lineament map indicate a difference of morphological appearance of lineaments in the satellite image. Indeed, all the lineaments present a specific organization. Five groups were classified based on three orientations: NE-SW, E-W and NW-SE. The overlapping of lineament map with the geologic map confirms that these lineaments of diverse directions can be identified and recognized on the field as a fault. The identified lineaments were linked to a deep faults caused by tectonic movements in Tunisia. This study shows the performance of the satellite image processing in the analysis and mapping of the accidents in the northern Atlas.
Highlights
IntroductionThe satellite images cover wide range of the area in the short period of time
In order to maintain the objectivity of the process, no confrontation or checks are made with data from classical geology before treatment of four images has been completed
The simple methodological approach based on the use of directional filters (Sobel filter) and histograms segmentation has contributed to the development of a specific lineament map
Summary
The satellite images cover wide range of the area in the short period of time. This fact leads to a better knowledge on the earth’s surface studies which become less complicated. In remote sensing there are many approaches to identify morphological and structural lineaments. In this paper, combined remote sensing applications through the processing of the Landsat-7 Enhance Thematic Mapper Plus (ETM+) and field observation were used to identify the faults and to estimate their directions in North-Eastren Tunsia. Geological structures of north-eastern Tunisia were extracted using detectable lineaments analysis on the satellite images. The method of associating the remote sensing with the geological and geo-morphological studies could provide considerable contribution on the lineament detection techniques
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