Abstract
As a part of the Sequential Machine Interpreted Lineament Extraction System (SMILES : Raghavanet al., 1993b, c), a subroutine for generating shaded relief image from digital elevation data is presented. The Automatic Relief Image Enhancement and Shading (ARIES) subroutine uses a simple Lambertian reflection model, wherein the direction of the illumination source is controlled by the user. In addition, the ARIES also incorporates routines for generating three dimensional terrain model by combining elevation data and digital images. Shaded relief images have been used for automatic extraction of lineament information. Further, it is suggested that the combination of digital elevation data and digital images may help simulate aerial reconnaissance and aid in ground verification of lineaments. The application results for a test site in southwestern Japan is described.
