Download or read book An Automated Procedure for Slope Map Construction. Volume I. Description and Instructions for Use of the Automated Procedure written by Horton Struve and published by . This book was released on 1977 with total page 104 pages. Available in PDF, EPUB and Kindle. Book excerpt: An automated procedure for constructing slope maps was developed and demonstrated in this study. The procedure consists of three sequential parts: (1) input of surface elevation values by means of a matrix of elevation values referred to as an elevation grid array, (2) calculation of slope magnitudes and directions by the computer program SLOPEMAP, and (3) construction of slope maps using various SLOPEMAP output products. The form of input elevation data selected for use by SLOPEMAP to be prepared in advance of program execution is an orthogonal two-dimensional matrix, each element of which is the elevation of the topographic surface at that matrix (or grid) point. At run time, SLOPEMAP inputs these elevation values and calculates the slope magnitude and direction of each input grid point by employing approximation methods that use the elevation values of the grid point in question and its nearest and next nearest neighbors. Then, depending on the selected user options, the calculations are recorded or displayed in one or more of the following forms: (1) printer swath dumps, (2) magnetic tapes, (3) punched cards, and/or (4) drum or cathode ray tube (CRT) graphic plots that delineate slope classes selected by the user.