Patent ID: 8990012
Filing Date: 2015-03-24
Classification: G01C,G06F

Abstract:
1. A map update data supply device that supplies data for updating a map database to a navigation device that has the map database, with the map database including at least road network information and divided into a plurality of sections, the map update data supply device comprising: an update map database that manages per section versions of an update data file of the map database, and stores per section an overwrite update data file that is an update data file for overwrite updating to a latest version, has the same format as the map database has, and includes all data constituting a map within a section as the map database includes, and a difference update data file that is an update data file for difference updating to a particular version; a request update data extraction unit that, based on an update request from the navigation device, extracts a request update section that includes at least one of the sections of the road network data subjected to an overwrite update, and extracts for each section of the road network data in the request update section the overwrite update data file as a first supply data file that is a data file to be supplied to the navigation device; a safeguard update data extraction unit that extracts a safeguard update section that includes sections of the road network data adjacent to the request update section and which require a difference update to safeguard road network connections between the request update section and the sections of the road network included in the safeguard update section, and extracts for each section of the road network data in the safeguard update section the difference update data file up to an update safeguard version, which is a version requiring a difference update to safeguard the road network connection, as a second supply data file that is a data file to be supplied to the navigation device, wherein, for each particular difference update data file of all of the difference update files for a particular section of the road network data in the safeguard update section that are between a version of the overwrite update data file and a current version of the safeguard update section: a data supply unit that supplies to the navigation device the first supply data file for each section of the road network data in the request update section extracted by the request update data extraction unit, and the second supply data file for each safeguard update section extracted by the safeguard update data extraction unit.