NAVIGATION SYSTEM, ROUTE SEARCH SERVER, TERMINAL UNIT, AND MAP DISPLAY METHOD

• Main Authors: KIKUCHI ARATA, AIHARA KENICHI
• Format: Patent
• Language: English
• Published: 04.10.2007
• Subjects: ADVERTISING; APPLIANCES FOR TEACHING, OR COMMUNICATING WITH, THE BLIND,DEAF OR MUTE; CALCULATING; COMPUTING; COUNTING; CRYPTOGRAPHY; DIAGRAMS; DISPLAY; EDUCATION; EDUCATIONAL OR DEMONSTRATION APPLIANCES; GLOBES; GYROSCOPIC INSTRUMENTS; IMAGE DATA PROCESSING OR GENERATION, IN GENERAL; MEASURING; MEASURING DISTANCES, LEVELS OR BEARINGS; NAVIGATION; PHOTOGRAMMETRY OR VIDEOGRAMMETRY; PHYSICS; PLANETARIA; SEALS; SIGNALLING; SURVEYING; TESTING; TRAFFIC CONTROL SYSTEMS

PROBLEM TO BE SOLVED: To notify so that a map is not moved beyond the boundary of an area in which data displayable in a three-dimensional manner does not exist in a terminal unit having a display mode for displaying a three-dimensional map and a display mode for displaying a two-dimensional map. SOLUTION: The route search sever 30 includes a polygon database 318 which accumulates polygon data for displaying a three-dimensional map and area information in which the polygon data exists and distributes the polygon data within a predetermined range to the terminal unit 20 in accordance with a viewpoint position. The terminal unit 20 comprises a display means 221 for displaying the three-dimensional map and an area notification means 223 and displays the three-dimensional map on the basis of the polygon data distributed from the route search server 30. When the viewpoint position approaches a predetermined range of the boundary of the area in which three-dimensional polygon data exists, the area notification means 223 outputs a message indicating the termination of the three-dimensional display and provides a state waiting for acceptance concerning switching to a two-dimensional display mode. COPYRIGHT: (C)2008,JPO&INPIT