Abstract
The road network analysis is one of important themes of geographic information processing and has been studied profoundly. In respect of large scaled road networks, i.e. the ones including alleys where cats roam, however, studies have just begun. It is halfly due to lack of structurized data of such large scaled networks. Recently digital geographic data have been produced and commerced for multi users. But in almost all the cases, road data are made as road margins, not as structurized networks. This study develops a method to transform such margins into networks and shows its feasibility with regard to "Numeric Map 10, 000" by GEO-GRAPHICAL SURVEY.
