Patent ID: 7508400
Filing Date: 2009-03-24
Classification: G01C

Abstract:
1. A digital map data processing system that generates map data for drawing a map, said digital map data processing system comprising: a base data input module that inputs geometric data and attributes required for specification of geometry of multiple road polygons, which are used to draw roads included in the map data; and a polygon data generation module that selects one of multiple terminal processing techniques to be applied for specification of terminal geometry of each road polygon, based on at least part of attributes of an object road as a processing target and a connection road to be connected to the object road, geometry of the object road and the connection road determined by the input geometric data, and directions of the object road and the connection road, said polygon data generation module applying the selected terminal processing technique to specify the terminal geometry of each road polygon according to the geometric data and generating polygon data required for drawing the road polygons, wherein said polygon data generation module selects the terminal processing technique based on a result of a comparison between road classes of the object road and the connection road, and wherein when there are plural connection roads relative to one object road, said polygon data generation module changes over conditions for the selection of the terminal processing technique between a case where any of the plural connection roads and the object road are included in an identical road class and any other case.