THREE-DIMENSIONAL MAP DISPLAY SYSTEM

摘要

[Object] To enable representation of undulation with a light processing load by using three-dimensional ground surface data. [Solution] Ground surface data representing a three-dimensional shape of a ground surface is stored in a map database. In addition, a two-dimensional image (an image in the figure on the middle stage of Fig. 1 ) representing contrast of the ground surface is generated by projecting the ground surface data by applying lighting thereto, and the two-dimensional image is stored in map data as a ground surface texture. In displaying the map, the ground surface texture is pasted on the ground surface data and perspective projection is performed (an image in the figure on the lower stage of Fig. 1 ). By such a configuration, even without applying lighting, a map can be provided which can give undulation of a ground surface with a light processing load.