Patent ID: 9470533
Filing Date: 2016-10-18
CPC Classification: G01C

Claim Text:
1. A map distribution server that produces automotive navigation map data for automotive navigation systems, comprising: a lowermost-level difference translation unit; and an upper-level difference translation unit, wherein an automotive navigation map is represented by network data in which roads are expressed with links and intersections are expressed with nodes; automotive navigation map data has a multilevel structure in which the links are associated with one another among a minutest level and a plurality of other levels which are different from the minutest level in scale; the automotive navigation map data includes minutest-level map data representing links of the minutest level and other-levels map data representing links of each of the plurality of other levels; the lowermost-level difference translation unit is configured to produce relational database (RDB)-form difference data of the minutest level from RDB-form original data items including old and new map data items of the minutest level, the produced RDB-form difference data of the minutest level representing difference between the old data items of the minutest level and the new data items of the minutest level; and the upper-level difference translation unit is configured to: the server is configured to control an automotive navigation system to update an automotive navigation map based on the final difference data.