MAP DISTRIBUTION SERVER FOR AUTOMOTIVE NAVIGATION SYSTEMS, MAP DATA DISTRIBUTION SYSTEM, AND ROAD DIFFERENCE DATA PRODUCTION METHOD

摘要

Automotive navigation map data has a multilevel structure in which links have a relationship of association with one another among the minutest level and upper levels that are different from the minutest level in scale. A lowermost-level translation unit uses as original data items old and new RDB-form map data items of the minutest level to produce RDB-form difference data of the minutest level. An upper-level difference translation unit produces CSV-format data of a difference of each of the levels of the multilevel structure on the basis of CSV-format data, into which the difference data of the minutest level is translated, and information on the relationship of association among the links of the upper and lower levels in the automotive navigation map data, and integrates the difference data items as final map difference data for an automotive navigation map.

主权项

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 the minutest level and upper levels which are different from the minutest level in scale; the lowermost-level difference translation unit uses as original data items old and new map data items of the minutest level, which are of a relational database (RDB) form, to produce RDB-form difference data of the minutest level; and the upper-level difference translation unit produces difference data of each of the relevant levels of the multilevel structure on the basis of data, into which the difference data of the minutest level is translated, and information on a relationship of association among the links of the upper and lower levels of the automotive navigation map data, and integrates the resultant difference data items so as to produce final map difference data for the automotive navigation map.