Method of updating registered information in digital map

摘要

This invention provides a method of updating registered information when an old digital map is updated to a new digital map. In the method, coordinate series data representing a shape of a road around a registration point on the old map are acquired from a data base of the old map, a positional relationship between a reference point included in the shape of the road and the registration point is obtained, shape matching is carried out on the new map by using the coordinate series data to obtain a shape of a road on the new map corresponding to the shape of the road, and a reference point on the new map corresponding to the reference point is acquired from the shape of the road thus obtained, thereby specifying the registration point on the new map based on a positional relationship with the reference point on the new map.