Map data creating device, navigation device, and map processing system using these devices
First Claim
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.
3 Assignments
0 Petitions
Accused Products
Abstract
Disclosed is a map data creating device including an average travel speed calculating unit for calculating an average travel speed in each link included in searched route data showing a route which is searched for by a route searching unit according to information which is included in map data acquired from a map database and which is assigned to the link, a control unit for dividing the route which is searched for by the route searching unit into sub-routes according to the average travel speed from the average travel speed calculating unit to acquire map data about a map having a scale according to an average travel speed assigned to each of the sub-routes into which the route is divided from the map database, and a searched route data storage unit for storing the map data acquired by the control unit while bringing the map data into correspondence with the sub-route.
20 Citations
7 Claims
-
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. - View Dependent Claims (2, 3, 4, 5)
-
-
6. A navigation device comprising:
-
a current position detecting unit for detecting a current position and a current travel speed; an external data acquiring unit for acquiring searched route data showing a prospective travel route which is searched for and which is divided into a plurality of sub-routes according to average travel speeds calculated for each link included in the prospective travel route based on information included in an external database, and map data about maps corresponding respectively to said plurality of sub-routes, 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 control unit for performing a process of displaying from said acquired map data the map corresponding to a particular one of said plurality of sub-routes in which said detected current position is located, to guide a user along said searched route.
-
-
7. A map processing system comprising:
-
a map data creating device; and a navigation device, wherein said map data creating device includes; 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 said 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; 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; and an output unit for outputting data stored in said searched route data storage unit, and wherein said navigation device includes; a current position detecting unit for detecting a current position and a current travel speed; an external data acquiring unit for acquiring said searched route data outputted from the output unit of said map data creating device and map data; and a control unit for performing a process of displaying a map having a scale corresponding to said current position and said current travel speed according to said searched route data and said map data to guide a user along said searched prospective travel route.
-
Specification