MAP DATA PROCESSING DEVICE, MAP DATA PROCESSING METHOD, AND MAP DATA PROCESSING SYSTEM

摘要

PROBLEM TO BE SOLVED: To increase the speed of reading map data, and to efficiently update map data. SOLUTION: Map data stored in a map data storage device by the first data unit are partially updated in the second data unit smaller than the first data unit. The partially updated map data are stored again in the map data storage device by the first unit. COPYRIGHT: (C)2008,JPO&INPIT