The CADET Project Modification computer analysis, and both hard copy map-like images and computer tapes are available to the public. A mainframe computer program that permits an Apple microcomputer user to select a particular 40 by 40 pixel sub-scene from a Landsat computer compatible tape and download it to Apple computer diskette via telephone was developed at the University of Oklahoma. Because this mainframe program was designed to operate with United States format Landsat computer tapes, the program was modified to run with Canadian Landsat tapes. In addition, since the U.S. program operates on an IBM mainframe, additional modification was necessary for the program to run on the University of Alberta's Amdahl mainframe. This report discusses the modifications made on both the mainframe and Apple programs and provides information to operate the mainframe program using Canadian Landsat tapes. This information includes: (1) the steps necessary to run the Landsat Digital Image Analysis Program; (2) an example of a complete run; and (3) a list and purpose of files and routines written for the preprocessor package. (JN)