Method for changing coordinates value of digital map

Three-dimensional graphic library, and without the use of additional storage space, simply convert 2 the coordinate values ​​of a plurality of objects that make up the dimensional digital map and to show the three-dimensional effect to the case of displaying on the display panel. By a two-dimensional digital map of a predetermined area including a reference position loaded from the memory moved relative to the line of sight viewed from the reference position and the reference position, and form the XY coordinates of the center position of the two-dimensional digital maps have completed the movement to square and converting the coordinates of the objects that make up the two-dimensional digital map after the XY coordinates, converting reduced to a two-dimensional digital map converted to XY coordinates in the Y-axis to Y-axis coordinate value as a reduction ratio corresponding to the Y-axis coordinate value, and , an enlarged or reduced in accordance with the Y X-axis coordinate value of the object in the coordinate value is reduced to a predetermined transform function converts digital map conversion indicates the digital map a three-dimensional effect may appear on the display panel. Navigation, the two-dimensional map, a three-dimensional digital map, a bird's eye view, transform function, trapezoidal,