Patent ID: 6141014
Filing Date: 2000-10-31
Classification: G01C,G09B

Abstract:
A map display apparatus for displaying a perspective image of a map comprising:an image display device;map data storage means for storing map data of such map; andmap drawing means for preparing drawing data of such map using said map data read out from said map data storage means and for displaying an image of the map on said image display device on the basis of the drawing data,wherein said map drawing means includes coordinates transforming means for transforming coordinate data contained in the map data into data for displaying the perspective image of such map, andsaid coordinate transforming means includes perspective projection means for perspectively projecting the coordinate data contained in the map data onto a predetermined projection plane with a view point at a desired position to thereby prepare the drawing data of a bird's-eye view, and means for determining the projection plane on the basis of two predetermined points in the map data so that drawing positions of the two points after the perspectively projecting operation are coincident with predetermined positions.