Map difference data generation apparatus and map difference data generation method

Abstract

A map difference data generation apparatus includes: most recent and supplementary map data storage devices (9-11) storing primary most recent and supplementary map data, respectively; a map update reflection device (5) generating secondly most recent and supplementary map data according to an update of a first link, and generating tertiary most recent and supplementary map data according to an update of a second link; a determination device (5) determining a dependency relationship between the update of the first and second links, in accordance with results of searching a route in the tertiary most recent and supplementary map data between first and second nodes, which are both ends of the second link; and a map difference data generation device (5) generating map difference data, which defines a combination of the update of the first and second links, when the update of the first and second links have the dependency relationship.

Description

technical field [0001] The present disclosure relates to a map difference data generating device and a map difference data generating method for generating map difference data in response to a map update in which links are added or deleted from map data indicating connection patterns between nodes and links. Background technique [0002] Maps may be updated to require link additions or link deletions and cause discrepancies in map data before and after link additions or deletions. In this case, the map difference data distribution device generally generates the difference as map difference data and distributes the map difference data to the vehicle navigation system. For example, Patent Document 1 discloses a technique of generating map difference data on an area basis and distributing the map difference data to a car navigation system. [0003] Patent Document 1: JP-A-2008-249798 (corresponding to US2010 / 0030460) [0004] However, the method disclosed in Patent Document 1...

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Problems solved by technology

There is another possible problem, namely: the inability to successfully secure the road network

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