The map 3D-converter system for converting 2D maps into a 3D map, of the present invention, comprises: a 2D map data storage device for storing 2D map data with an attribute indicating that the 2D map data includes horizontal positions of the top view, or vertical positions of a side view; a 3D conversion...http://www.google.fr/patents/US6593926?utm_source=gb-gplus-shareBrevet US6593926 - Map 3D-converter system
