Patent ID: 6507784
Filing Date: 2003-01-14
Classification: G01C,G09B

Abstract:
A road map display apparatus including,a road map information memory for memorizing road map data on a two-dimensional coordinate, detection means for detecting a present position and a travel direction of an automotive vehicle, read out means for reading out the two-dimensional coordinate of the road map from the information memory in accordance with the present position and travel direction of the vehicle detected by the detection means, and image display means for displaying the read out two-dimensional coordinate in the form of a plane view on a screen,wherein coordinate conversion means is provided to convert a square two-dimensional coordinate to a trapezoid coordinate for display of a perspective view on a two-dimensional plane in such a manner that an upper side of the two-dimensional coordinate is appropriately contracted relatively to a lower side of the two-dimensional coordinate, and wherein the read-out means is arranged to read out the two-dimensional coordinate of the road map data corresponding with a perspective view to be displayed on the screen of the image display means, wherein the coordinate conversion means is arranged to convert the two-dimensional coordinate read out by the read-out means to the trapezoid coordinate, and wherein the image display means is arranged to display the converted trapezoid coordinate in the form of a perspective view on the screen.