Is a
Patent attributes
Patent Jurisdiction
Patent Number
Date of Patent
March 16, 2010
Patent Application Number
11712543
Date Filed
March 1, 2007
Patent Primary Examiner
Patent abstract
An information center has an all-road updating data and a main-road updating data. The all-road updating data is a difference of all roads extracted from an all-road map data, and the main-road updating map data is a difference of specified roads extracted from the all-road map data. A map display system executes a reverse-updating to return the map data to a previous state not updated with the main-road updated map data, when its map data has already been updated with the main-road updated map data. The map display system then executes updating of the map data with the all-road updated map data.
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