Three-dimensional terrain display method for navigation system, navigation system, and medium recording three-dimensional terrain display program

摘要

In a method for stereoscopically displaying the topographic map, a navigation system, and the recording medium recording the method, a multiple number of quadrilaterals with mutually adjoining four points of terrain locations as four vertices of each quadrilateral from the three-dimensional road map information are generated, each quadrilateral is divided into four triangles with one or two diagonal lines of each quadrilateral, a perspective projection transformation of three vertices of each triangle is performed onto a predetermined perspectively projected plane, a display color is allocated to each of the perspectively projected triangles, and the allocated display color is displayed on an image screen of a display device together with each of the perspectively projected triangles.