Abstract
I present a method to produce graphical images for PCs (Personal Computers) with an 8-bit-color monitor. Several different images are shown using geographical and geophysical data of different scales. The types of images shown are categorized into three, i.e. (i) pseudo color image, (ii) gray-scale shaded relief and (iii) overlaid images of two different types of data. Most of the presented images are derivatives from the data which I named 'bit-synthesized image' in this study. The 'bit-synthesized image' is defined as an image which bears two different types of information in each picture element (pixel) in a specific fromat. Using the specially arranged CLUT (Color Look Up Table) which is determined by the 'bit-synthesized image, We can see the two different types of information on the same image displayed on the color monitor screen. Image processing methods (IPM) have more advantages over the use of contour map and wire-framed surface expressions of 2D data when the size of data set becomes large, e. g. larger than 100 × 100. Using IPM, reduction of the CPU time and memory space for large data sets and more flexible 3-dimensional viewing techniques are available.
