Map differential data distribution system, map differential data distribution device, map data storage device, update management server, and map differential extraction server

Abstract

The map differential data distribution system includes map differential data distribution devices (1, 2), a map differential data storage unit (12) for storing map differential data, and a distribution unit (137) for distributing map differential data; and a map data storage device (3) An update unit (414) for updating the map data based on the map difference data is provided. The map differential data storage unit stores, as map differential data, data of map elements in a dependent relationship with updated map element data in retrospect to an update of a different version. The map differential data delivery device includes a non-updated data extraction unit (233) for extracting non-updated data that has not been updated in the map data storage device, and a grouping unit (134) for grouping data of map elements in a dependent relationship , and a delivery data creation unit (135) that creates delivery data by arranging the records of the grouped non-updated data within a predetermined communication size and arranging data of map elements with higher priority in earlier order .

Description

[0001] This disclosure claims priority based on Japanese Application No. 2013-085992 for which it applied on April 16, 2013, and uses the description content here. technical field [0002] The present disclosure relates to a map differential data distribution system for distributing map differential data, a map differential data distribution device included in the map differential data distribution system, a map data storage device, an update management server included in the map differential data distribution device, and a map differential Extract server. Background technique [0003] Conventionally, there is known a method that uses, for example, the difference between map data of a version number (hereinafter referred to as version) before updating map elements such as roads and map data of a version after updating map elements as map difference data. Technology for delivery to car navigation devices. The car navigation device that has received distribution of the map di...

AI Technical Summary

Problems solved by technology

As the number of versions that must be traced increases, the number of updates of map elements in a dependent relationship increases, so the communication size at the time of map differential data distribution may increase excessively

[0007] In addition, there are also restrictions on the communication size in one delivery, or the communication size in daily or monthly units. If the communication size of the map differential data is excessively increased, the situation that the map differential data cannot be distributed may also occur. question

Furthermore, in order to solve this problem, if the map difference data is simply divided and distributed so as to narrow it down to a restricted range, only a part of the divided map difference data will generate updated map elements such as road networks. The problem that the relationship between the

[0008] In addition, it can be considered that if the map differential data is divided into a restricted range and simply divided into multiple distributions, the map differential data that is less necessary for users and the map differential data that is more necessary will be separated. Differential data will occur in large numbers compared to the situation of being delivered first

Furthermore, it can be considered that the update of the map element which is less necessary for the user is performed before the update of the map element which is more necessary.

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