Map creation system and map creating method

1. A map creation system comprising:

an on-board unit which includes a positional information acquisition unit acquiring positional information of a vehicle by means of a GPS, a gyro, or a vehicle speed sensor, and a trajectory data creation unit creating the trajectory data of the vehicle travelling in a predetermined area on a first road on a basis of the positional information of the vehicle acquired by the positional information acquisition unit; and

a map creation server apparatus which includes a transmission and reception unit receiving trajectory data configured to be transmitted from the on-board unit, wherein

the first road is a toll-free road where the vehicle travelling is not charged for a fee or a toll road where the vehicle travelling is charged for a fee,

a second road is a toll road where the vehicle travelling is charged for a higher fee than the first road,

the map creation server apparatus comprises:

a representative point extraction unit extracting plural pieces of the trajectory data for the first road created by the trajectory data creation unit, and representative points of the first road located on a side of the second road;

a road data creation unit creating road data for the first road on map data by connecting the plural representative points of the first road or by finding an approximate line of the plural representative points of the first road, the plural representative points being extracted by the representative point extraction unit for respective plural predetermined areas; and

a map update unit checking the road data newly created by the road data creation unit by comparison with the road data already existing, and replacing the existing road data with the newly created road data if updating is determined to be required.

2. The map creation system according to claim 1 , wherein the representative point extraction unit extracts the representative points on a basis of a frequency distribution of the plural pieces of trajectory data in a predetermined area.

3. The map creation system according to claim 1 , wherein the second road is parallel to the first road or intersects with the first road.

4. A map creating method comprising:

a step of acquiring positional information of a vehicle by means of a GPS, a gyro, or a vehicle speed sensor;

a step of creating trajectory data of the vehicle travelling in a predetermined area on a first road on a basis of the positional information of the vehicle;

the first road being a toll-free road where the vehicle travelling is not charged for a fee or a toll road where the vehicle travelling is charged for a fee,

a second road being a toll road where the vehicle travelling is charged for a higher fee than the first road,

a step of extracting created plural pieces of the trajectory data for the first road, and representative points of the first road located on a side of the second road;

a step of creating road data for the first road on map data by connecting the plural representative points of the first road or by finding an approximate line of the plural representative points of the first road, the plural representative points being extracted for respective plural predetermined areas; and

a step of checking the road data newly created by the road data creation unit by comparison with the road data already existing, and replacing the existing road data with the newly created road data if updating is determined to be required.

5. The map creation system according to claim 1 , wherein

the trajectory data creation unit creates the trajectory data of the vehicle travelling in a predetermined area on the second road on a basis of the positional information of the vehicle,

the representative point extraction unit extracts plural pieces of the trajectory data for the second road created by the trajectory data creation unit, and the representative points of the second road located on a side of the first road different from the second road, and

the road data creation unit creates the road data for the second road on map data by connecting the plural representative points of the second road or by finding an approximate line of the plural representative points of the second road, the plural representative points being extracted by the representative point extraction unit for respective plural predetermined areas.

6. The map creation system according to claim 5 , wherein the representative point extraction unit extracts the representative points on a basis of a frequency distribution of the plural pieces of trajectory data in the predetermined area.

7. The map creation system according to claim 2 , wherein

if the frequency distribution of plural pieces of the trajectory data for the first road and the frequency distribution of plural pieces of the trajectory data for the second road overlap each other,

the representative point extraction unit extracts the representative point of the first road located closest to the side of the second road,

the road data creation unit creates the road data for the first road on map data by connecting the plural representative points of the first road or by finding an approximate line of the plural representative points of the first road, the plural representative points being extracted by the representative point extraction unit for respective plural predetermined areas, and

the representative point extraction unit extracts the representative points of the second road located on a side of the road data for the first road.

8. The map creation system according to claim 5 , wherein the second road is parallel to the first road or intersects with the first road.