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A Basic Study of a Method to Combine Automatically with Road Network Data Divided by Surrounding Frameworks and Municipal Boundary on Digital Map

This paper aimed to propose a method to combine automatically road networks divided by surrounding frameworks and municipal boundary for urban analysis. We need to integrate the road network data because most of spatial data are usually divided by surrounding frameworks and municipal boundary. In addition, there is no unique attribute data to combine the road data using Geographic Information System (GIS). We consider not only the topological data like the degrees of nodes, but also the attribute data in relation to surrounding frameworks. At first, we survey the available digital maps which include polyline data of road networks and the effect of file divide. Then we develop the algorithm to combine automatically and apply the tool to the digital maps 2500 and 25000 of the Geographical Survey Institute, Japan.