| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for updating a map data base used in a navigation system and integrating the data of a type different from map data contained in the map data base and a data base architecture constituted so as to perform generalization. SOLUTION: A data access layer receives a request from a navigation program application to map reference data, accesses the map data base and supplies a response to the request. Logic rules are related to the map data base. The data access layer is provided with a deduction data base engine for accessing and combining the logic rules so as to decide the method for converting the data from a format for which indexes are used so as to access the data from a medium and they are stored in the medium to the format usable by the navigation program application. |
