Law Offices of David G. Posz
Method of making update information of map data and differential data of map data updating system
A differential update method for vehicular navigation apparatus, which can precisely update map data stored in a storage medium to up-to-date contents. When a provider of CD generates original map data for each year, the provider puts a permanent identification information (ID) for each graphic data in the CD. When the provider generates the CD for each year from the original map data, the provider generates administration information in which the ID of each graphic data and storage position of the ID in the CD are associated with each other. After that, the provider also prepares a differential data by comparing a 20XX version original map data with a 20XY version original map data, and administration information for year 20XX. The provider generates the update information for updating the 20XX version CD to the 20XY version based on the differential data and the administration information, so that which graphic data in the CD is updated and is how is the graphic data updated. The provider transmits the update information to the vehicular navigation apparatus.
Denso Corporation
G G
G06F G01C
inventional inventional
Noriko
Kato