Using Landsat ETM data, the authors applied remote sensing to geological mapping. First, the image

processing (using ER Mapper 6.2 platform) mainly based on the principal component analysis, RGB-HSI-RGB

transformation and false-color composition was adjusted according to several geological sections in the working area

in order that the major lithological units could be distinguished from each other on the image. Then ETM Pan as well

as the 15 m resolution band  was used for promoting some final images to  1︰50,000 scale through data fusion.

Moreover, geological mapping was carried out by using ARCVIEW 3.0 a platform on the basis of the images and in the

light of the cross section studies and all of the known facts. Certain lithological boundaries and faults were

selected to be inspected in site and the image processing was adjusted again to the inspection result. In the end,

the geological map was fulfilled through the final modification based on the further processed images, general

analyses and editing on the ArcInfo 7.1.1 platform. Field examination shows that this geological mapping method

using remote sensing is accurate and suitable to the areas characterized by limited vegetation and soils as well as

tough topography.