ABSTRACT

In the current study we proposed a new band ratio combination by using Landsat Enhanced Thematic Mapper (ETM+) image. The new proposed band ratio hasbeen tested for its effectiveness in four regions in the study area. This proposedband ratio (5/3, 3/1, 7/5 in RGB respectively) with the help of supervisedclassification technique were succeeded in discrimination of different types ofrock units. The results revealed that by using the proposed band ratio it was soeffective to discriminate different granitic phases (Kadabora region); serpentinitesfrom metasediments and sheared granites (El Mayite region); mollase type Hammamat sediments from metavolcanics and metasediments (Wadi El-Miyahregion); and serpentinites from metavolcanics (El-Baramiya region). The resultsdemonstrate the accuracy and suitability of using this band ratio as a powerfultool in lithological mapping and the data was verified by field investigation andprevious studies.