Patent ID: 9710956
Date: 2017-07-18
CPC Classifications: G01C,G06F,G06K,G06T,G09B

Claim:
1. A three-dimensional map display system comprising: a display terminal that displays a three-dimensional map; a memory that stores a map database including three-dimensional polygon data representing geography and a three-dimensional shape of each feature; and a display controller that reads data from the memory and generates the three-dimensional map to be displayed on the display terminal, the display controller including: wherein the offset setting section shifts the first polygon and the second polygon such that the height difference therebetween when the first and second polygons are at a position farther from the viewpoint position of the perspective projection is greater than the height difference between the first and second polygons when the first and second polygons are at a position closer to the viewpoint position, thereby effectively suppressing Z-fighting in the overlapping area at the position farther from the viewpoint position in the three-dimensional map displayed on the display terminal.