Road information provision system, road information provision apparatus, and road information generation method
View Patent ↗An object of the invention is to provide a traffic information provision system which can arbitrarily set a position resolution and a traffic representation resolution and flexibly support a traffic information prediction service. The traffic information provision system of the invention quantizes the state quantity of traffic information changing along a road, converts said quantized state quantity to a value having statistical deviation, performs encoding of said value, and provides the encoded value to traffic information utilization apparatus such as a car navigation system. The traffic information utilization apparatus decodes said encoded state quantity to reproduce the traffic information on said road.
1. A road information provision apparatus comprising:
a sampling point setting unit for setting sampling points along a road from a reference point of a road section specified by road section reference data with constant intervals;
a calculating unit for calculating state quantities of traffic information changing along the road in the road section for the sampling points based on original measurement information;
a traffic information converting unit for converting the calculated state of quantities of the traffic information for the sampling points to values concentrated around a specific value; and
an encoding unit for encoding and compressing the values obtained by the conversion.
2. The road information provision apparatus according to claim 1 , wherein the state quantities include any one of a travel speed, a travel time and a congestion situation.
3. The road information provision apparatus according to claim 1 , wherein the compression unit compresses the state quantities by transforming the state quantities to a coefficient value of a frequency component by way of orthogonal transformation.
4. The road information provision apparatus according to claim 3 , wherein the compression unit compresses the state quantities by deleting values of high frequency components.
5. The road information provision apparatus according to claim 1 , wherein the road information provision apparatus is one of a probe-car-mounted machine and a navigation system mounted on a vehicle.
6. The road information provision apparatus according to claim 1 , wherein the road information provision apparatus is a center-side apparatus providing traffic information.
7. A road information utilizing apparatus for reproducing, on a digital map, the state quantities of the traffic information transmitted from the road information provision apparatus according to claim 1 .
8. A road information provision apparatus comprising:
a sampling point setting unit for setting sampling points by dividing a road section specified by road section reference data with constant intervals along a road;
a calculating unit for calculating state quantities of traffic information changing along the road in the road section for the sampling points based on original measurement information;
a traffic information converting unit for converting the calculated state quantities of the traffic information for the sampling points to values concentrated around a specific value; and
an encoding unit for encoding and compressing the values obtained by the conversion.
9. The road information provision apparatus according to claim 8 , wherein the state quantities include any one of a travel speed, a travel time and a congestion situation.
10. The road information provision apparatus according to claim 8 , wherein the compression unit compresses the state quantities by transforming the state quantities to a coefficient value of a frequency component by way of orthogonal transformation.
11. The road information provision apparatus according to claim 10 , wherein the compression unit compresses the state quantities by deleting values of high frequency components.
12. The road information provision apparatus according to claim 8 , wherein the road information provision apparatus is one of a probe-car-mounted machine and a navigation system mounted on a vehicle.
13. The road information provision apparatus according to claim 8 , wherein the road information provision apparatus is a center-side apparatus providing traffic information.
14. A road information utilizing apparatus for reproducing, on a digital map, the state quantities of the traffic information transmitted from the road information provision apparatus according to claim 8 .
15. A road information provision method comprising:
setting sampling points along a road from a reference point of a road section specified by road section reference data with constant intervals;
calculating state quantities of traffic information changing along the road in the road section for the sampling points based on original measurement information;
converting the calculated state quantities of the traffic information for the sampling points to values concentrated around a particular value; and
encoding and compressing the values obtained by the conversion.
16. A computer readable recording medium storing a program which causes a computer to execute the method according to claim 15 .
17. A road information provision method comprising:
setting sampling points by-dividing a road section specified by road section reference data with constant intervals along a road;
calculating state quantities of traffic information changing along the road in the road section for the sampling points based on original measurement information;
converting the calculated state quantities of the traffic information for the sampling points to values concentrated around a specific value; and
encoding and compressing the values obtained by the conversion.
18. A computer readable recording medium storing a program which causes a computer to execute the method according to claim 17 .