Megalineament pattern of gujarat from landsat imagery an attempt to fit into the geological framework

Abstract

The American LANDSAT-I Satellite has acquired Multispectral Scanner Data on four discrete wave-length bands from the green to the near IR spectral regions of almost the entire land area of the world, often repetitively. The territory of Gujarat State and the adjoining region falls on 20 overlapping LANDSAT frames, each of 185 X 185 Kms. Linear features exposed on these individual itnages are many times enhanced when viewed in combination. A number of these lineaments, particularly those with long surficial extent and contrasting expression, reflect the dominat geological trend lines, fracture Systems and tectonic features. An interpretation of the photo format imagery, acquired in late 1972 using Single band as well as additive combination techniques, is presented. An attempt is made to explain the geological signiflcance or lack of it in the case of the dominant lineaments (megalineaments), taking intoconsideration the known geological framework of the area. The methodology for extending such analytical work to areas less known is outlined.