Map information distribution center and map information distribution method

Abstract

As for the navigation updating history information in an individual navigation device, sorted by a navigation ID which specifies the navigation device, the version of map information currently stored in the navigation device is stored corresponding to each block ID given to an area of an approximately 2.5 km square sorted in three distribution road categories of high standard which represents high standard roads such as national expressways and city expressways, ordinary which represents ordinary roads such as national roads of three digit numbers or more, principal local roads, prefectural roads and municipal roads, and narrow street which represents narrow streets.

Description

technical field [0001] The invention relates to a map information distribution center. More particularly, the present invention relates to a map information distribution center that transmits update information for updating map information to a navigation device. Furthermore, the present invention relates to a map information distribution system, and more particularly, to a map information distribution system that transmits update information for updating map information from a map information distribution center to a navigation device. Background technique [0002] Recently, more and more vehicles have been equipped with navigation devices that provide driving guidance so that drivers can easily reach desired destinations. Here, the navigation device is a device that detects the current vehicle position by a GPS receiver, etc., obtains map data corresponding to the current position from a recording medium (such as DVD-ROM and HDD) or via a network, and displays it on a liq...

AI Technical Summary

Problems solved by technology

There is a problem that the amount of communication data between the navigation device and the map information distribution center becomes large every time the grid number for updating is transmitted

In addition, when the navigation device is updated based on the map information recorded on the storage medium, since the map information distribution center does not know the current version of the map information stored in the navigation device, there is a problem that it is not possible to extract only the minimum amount of Differentiate the data and send this data to the navigation device

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