Lineaments detection was performed by the analyst on screen. The software package allows easy manipulation of the image, like zooming and image rotation which avoids introducing  a directional bias. 

Lineaments that were interpreted by the analyst as being of geological and geomorphological origin, were extracted from 17 enhanced images, the 6 contrast stretched TM reflected bands, the ratios 3/2, 1/2, 4/3, 4/2 and 4/7 and also the 6 principal components. 

The first set of lines were identified on contrast stretched TM band 5. The file produced was overlain on the second image, where more lineaments were detected and so on until a complete map of lineaments was produced. This map was then screened to remove man-made lineaments like roads.

 Lineaments detected and digitized on TM band 5 were overlain on principal component 2.  New lineaments detected on PC2 were digitized.