초록 ▼

To display a current position of a vehicle along a road in a stereoscopic map drawn based on three-dimensional map data, a navigation device forms a picture image superposing the current position of the vehicle on a perspective map viewing a three-dimensional ground surface from a direction forming

To display a current position of a vehicle along a road in a stereoscopic map drawn based on three-dimensional map data, a navigation device forms a picture image superposing the current position of the vehicle on a perspective map viewing a three-dimensional ground surface from a direction forming a predetermined angle with respect thereto based on data read from a map data base and displays the image on a screen of a display and a position correcting unit 52 calculates an altitude at a position in the map in correspondence with the current position of the vehicle based on altitude data read from the map data base.

대표청구항 ▼

[ What is claimed is:] [1.] A navigation device for displaying a current position of a mobile unit on a screen of a display device by superposing the current position on a map, said navigation device comprising:position measuring means for measuring the current position of the mobile unit;reading me

[ What is claimed is:] [1.] A navigation device for displaying a current position of a mobile unit on a screen of a display device by superposing the current position on a map, said navigation device comprising:position measuring means for measuring the current position of the mobile unit;reading means for reading map data from a map data base where altitude data as a map constituent element is included;mobile unit altitude determining means for determining an altitude of the mobile unit, by calculating an altitude at a position corresponding to a two-dimensional position of the mobile unit having been measured by said measuring means, based on said altitude data as a map constituent element; anddisplaying means for forming a perspective map based on the map data read by the reading means, provided by viewing from a direction at a predetermined angle with respect to a ground surface, determining a position for displaying the mobile unit three-dimensionally, according to the two-dimensional position and the altitude of the mobile unit have been calculated and displaying the current position of the mobile unit on the screen of the display device by superposing the current position on the perspective map.