Patent ID: 7627414
Filing Date: 2009-12-01
Classification: G01C,G08G,G09B

Abstract:
1. A road map management system comprising: data collecting means for collecting traveling position data, which indicates traveling positions of a plurality of vehicles having individual terminals, from the terminals; distribution map generating means for generating at least two distribution maps including a first distribution map generated as an aggregate of points based on traveling position data relative to the plurality of vehicles collected by the data collecting means during an earlier collection period and a second distribution map generated as an aggregate of points based on traveling position data relative to the plurality of vehicles collected by the data collecting means during a later collection period, which has no overlap period with the earlier collection period; difference map generating means for generating a difference map indicating a difference between the first distribution map and the second distribution map; and road change defining means for the road change defining means defines, as a recently opened road, a differential distribution, which is absent from the first distribution map and present in the second distribution map and is determined to be outside of a road included in road map data after undergoing a map matching process.