MAP DATA DISTRIBUTION SYSTEM AND MAP DATA UPDATING METHOD

• Main Authors: NAKA KENJI, INAYOSHI HIROKAZU, MORIOKA MICHIO, ASAHARA AKINORI, TANABATA TAKAYA
• Format: Patent
• Language: English
• Published: 29.01.2009
• Subjects: ADVERTISING; APPLIANCES FOR TEACHING, OR COMMUNICATING WITH, THE BLIND,DEAF OR MUTE; CRYPTOGRAPHY; DIAGRAMS; DISPLAY; EDUCATION; EDUCATIONAL OR DEMONSTRATION APPLIANCES; GLOBES; GYROSCOPIC INSTRUMENTS; MEASURING; MEASURING DISTANCES, LEVELS OR BEARINGS; NAVIGATION; PHOTOGRAMMETRY OR VIDEOGRAMMETRY; PHYSICS; PLANETARIA; SEALS; SIGNALLING; SURVEYING; TESTING; TRAFFIC CONTROL SYSTEMS

PROBLEM TO BE SOLVED: To reduce stop time of navigation function when map data is updated in a navigation system. SOLUTION: A map data distribution system includes a server which distributes map data and a mobile terminal which receives the map data. The server stores, for each area, the difference data between pieces of map data obtained before and after updated, and sends the difference data of map data of an area requested by the mobile terminal to the mobile terminal. The mobile terminal includes a database for storing map data and an updated-data store part for storing updated map data, generates updated data by using the received difference data, stores the updated data in the updated-data store part and then in the database. When map data is fetched while the updated data is being stored from the updated-data store part into the database, the mobile terminal fetches the requested map data from the updated-data store part when the map data to be fetched is stored in the updated-data store part. COPYRIGHT: (C)2009,JPO&INPIT