THREE-DIMENSIONAL-MAP DISPLAY SYSTEM

摘要

[Object] To realize three-dimensional display while visibility of characters is ensured in the 3D map. [Solution] In displaying a 3D map, a feature image is generated by perspective projection of the feature on the basis of a predetermined position of the point of sight and a predetermined direction of the line of sight. In addition, a plate polygon on which characters are pasted is arranged in a virtual 3D space, and parallel projection is applied to the plate polygon so as to generate a character image. The plate polygon is arranged in a direction along a road and tilted from the ground surface. A tilt angle between the plate polygon and the ground surface is set on the basis of a display direction of the road and a display position of the character. Thus, by generating a feature image by perspective projection while generating a character image by parallel projection, negative effects such as crushing of distant characters can be avoided, whereby the characters can be displayed in three-dimensional shape without reducing visibility thereof.