Abstract
The acquisition of digital road maps is essential for automobile navigation. Digital road maps are used in Japan by the Digital Road Map Association (DRMA) based on 1/25,000 map. The digital map, however, is unsuitable for town driving. In this situation a more detailed digital road map is requested by the users. To get a detailed digital road map from a paper map is a very expensive operation. We proposed a new method to obtain a more precise digital road map using a more detailed general purpose digital map which has already been published. However, using this digital map directly for auto-navigation is impossible. The method we propose in this paper obtains more detailed road network data from the 1/10,000 map and from the DRMA data.
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