Three-dimensional Representation by Contour Line Method

Abstract

This paper reports the method of Three-dimensional representation of a topographic map by contour line and programs for this purpose.
The method for this representation is perspective projection with three vanishing points. In this method, data for drawing the representation are not grid data, but coordinate data of points on the contour line. Therefore, it needs to make the program for reading those points on the contour map and for editing those data, in addition to program for drawing Threedimensional representation.
Programs which are reported are as follows;
(1) Program for data reading by Image-Scanner: “IMAGE. IN”
(2) Program for drawing three-dimensional map: “THREED”
(3) Program for data editing: “DEDITOR”