Patent ID: 8600666
Filing Date: 2013-12-03
Classification: G01C

Abstract:
1. A map data creating device comprising: a map database for storing map data; a route searching unit for searching for a prospective travel route comprising a plurality of links, the prospective travel route leading from a place of departure to a destination and being described by searched route data; an average travel speed calculating unit for calculating an average travel speed for each link included in the searched route data based on information which is included in the map data acquired from said map database and which is assigned to a corresponding link; a control unit for dividing the prospective travel route which is searched for by said route searching unit into sub-routes according to the average travel speeds calculated by said average travel speed calculating unit to acquire map data about maps for the respective sub-routes from said map database, the scale of each of said maps being determined according to one of the calculated average travel speeds associated with the corresponding sub-route; and a searched route data storage unit for storing the map data acquired by said control unit while bringing the map data into correspondence with said each of the sub-routes.