| http://www.w3.org/ns/prov#value | - For the vector map, a technique that an area between two line segments almost parallel to each other is regarded as a road and a road network is extracted from the vector map (Published Unexamined Japanese patent Application No. H3-3083 of 1991), a technique that road areas or areas other than road areas are painted out, the road areas painted out or the areas painted out are thinned to form line
|
