Patent ID: 6023655
Filing Date: 2000-02-08
Classification: G01C,G09B

Abstract:
A map database apparatus in which a road is expressed by using a plurality of sets of data related to links each of which links has nodes at a front end and at a rear end, data related to a plurality of links provided separately for maps at different scales are respectively stored as roadmap data from a highest order level at a smallest scale through a lowest order level at a largest scale, a map area at a high order level is divided into a plurality of M small areas, each of sets of detail information corresponding to said M small areas is stored as a set of roadmap data of a map area at a low order level, and M sets of roadmap data are stored at the low order level, wherein:correspondence information between nodes at different levels when said low order level is viewed from said high order level is provided as level correspondence data that express corresponding relationships between roadmap data at said high order level at the small scale and roadmap data at said low order level at the large scale.