For many years, the geomorphology research has devoted to theresearch on landform features of the large region at small scale, and theresearch on landform features and process of the small region at big scaleprogress slowly. Although the development of DEM and GIS hasprovided the powerful tools for the geomorphology research, the analysisof landform features of small region at big scale is superficial becauseDEM at large scale is manufactured with large difficulties with thelimitations of basic t...