Patent ID: 7890252
Filing Date: 2011-02-15
Classification: G01C

Abstract:
1. A map-data-generation method capable of generating hierarchical map data by using road link information associated with a reference level map, the method comprising: determining, with a first link-determination unit, at least one first upper level link of a first upper level map by using the road link information associated with the reference level map, the first upper level map being at a higher map level than the reference level map, and specifying at least one link to function as a route-search-start link of the first upper level map; and determining, with a second-link determination unit, upper level links of a plurality of upper level maps higher than the first upper level map by using information associated with the first upper level link, and specifying at least one upper level link to function as a route-search-start link for each of the plurality of upper level maps, wherein the plurality of upper level maps are defined according to a distance range between a departure point and a destination point.