Godratolah Farhoudi - Department of Geology, Faculty of Science, Islamic Azad University - Shiraz Branch, Shiraz, Iran
Jafar Rahnamarad - Department of Geology, Zahedan Branch, Islamic Azad University, Zahedan, Iran
Mohammad Tayebi - Department of Geology, University of Shiraz, Shiraz, Iran

Morphological analysis of topographic features, especially lineaments, has been used in tectonic and structural studies for a long time. These studies are considered to be the basis of tectonic analysis. Detecting and enhancing these features in an area like the western part of the Alborz, which is covered by vegetation, was done by use of SRTM ۹۰ m data. To extract lineaments we used various image processing and enhancement techniques on images and three different approaches including manual, semi-automatic and automatic lineament extraction were adopted. Then the lineament layers, obtained from these methods were overlaid to produce a final lineament map. In this way we were able to detect and enhance lineaments and prepare density and intersection maps using GIS software, which enabled us to provide a good view of the structural geology of the area.

West Alborz, remote sensing, GIS, Density maps, Intersection maps, SRTM ۹۰ m