Road information providing system and road information providing apparatus and road information generating method

a technology of information providing system and information providing apparatus, which is applied in the direction of vehicle position indication, navigation instruments, instruments, etc., can solve the problems of inability to support a variety of requests, huge social costs, and cumulative errors

Inactive Publication Date: 2005-08-04
PANASONIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0052] According to the road information provision system of the invention, it is possible to arbitrarily set a position resolution and a traffic representation resolution thus changin...

Problems solved by technology

With this, the data on the digital map from each company needs updating so that the maintenance requires huge social costs.
In case the positions of nodes included in a shape data, cumulative errors occur.
However, the currently provided traffic information has the following problems and cannot support a variety of requests for road information, that is, traffic information in line with general traffic info...

Method used

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  • Road information providing system and road information providing apparatus and road information generating method
  • Road information providing system and road information providing apparatus and road information generating method
  • Road information providing system and road information providing apparatus and road information generating method

Examples

Experimental program
Comparison scheme
Effect test

first embodiment

(First Embodiment)

[0185]

[0186] A first embodiment of the invention pertains to a case where a state quantity of traffic information (congestion information and travel time information) at each sampling point is quantized and variable length encoded to generate traffic information.

[0187] Referring to FIG. 2, a schematic view of a graph showing the traffic information (congestion information and travel time information), with the horizontal axis representing a distance on the shape data and the vertical axis a time axis. One square of the horizontal axis represents the unit block length of a quantization-unit (quantization-unit in the direction of distance) set by way of sampling while one square of the vertical axis a constant time interval. In each square of this graph is recorded travel speed information corresponding to the distance from the reference node (start point) and the time elapsed from the current time. A reference node for correction of relative position is set to the ...

second embodiment

(Second Embodiment)

[0265]

[0266] A second embodiment of the invention pertains to generation of prediction information of traffic information. To represent prediction information by difference, two methods are available as schematically shown in FIG. 15.

[0267] The first method is a method whereby the difference in the direction of distance in the traffic information of the time zone N+1 (a) is calculated (d) and the information on this difference (change point) is encoded. This approach is the same as the encoding of current information described in the second embodiment.

[0268] The second method is a method whereby the difference between the traffic information of the time zone N+1 (a) and the traffic information of the preceding time zone N (b) is extracted (c), and the difference in the direction of distance is calculated based on the extracted difference for later encoding (e).

[0269] Which of the first and second methods is more advantageous in terms of reduction of data volume...

third embodiment

(Third Embodiment)

[0299] A third embodiment of the invention pertains to a method for performing orthogonal transformation on the traffic information represented by a function of distance from the reference node to decompose the information into frequency components and representing the traffic information by the coefficient of each frequency component.

[0300] Approaches to perform orthogonal transformation on chronological data and convert the data to a coefficient of frequency component include FFT (fast Fourier Transform, DCT (discrete cosine transform), and wavelet transform. The FFT (fast Fourier Transform) which is the most popular is described below.

[0301] The Fourier Transform is a transform process which uses a finite number of discrete values (sample values) to obtain a Fourier coefficient. The Fourier Transform refers to a process where a complex function C is associated with a discrete value represented by a complex function f:

C(k)=(1 / n)Σf(j)·ω−jk (k=0, 1, 2, . . . , n...

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PUM

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Abstract

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.

Description

TECHNICAL FIELD [0001] The present invention relates to a method for generating traffic information representing traffic congestion and travel time, a system for providing the traffic information, and apparatus constituting the system, and in particular to a method for generating traffic information representing traffic congestion and travel time, a system for providing the traffic information, and apparatus constituting the system which converts traffic information such as traffic congestion and travel time in a new form in order to efficiently provide road information full of rich information. BACKGROUND ART <Current VICS Traffic Information>[0002] VICS (Vehicle Information and Communication System) which currently provides a car navigation system with a traffic information provision system collects and edits traffic information and transmits traffic congestion information and travel time information representing the time required by way of an FM multiplex broadcast or a bea...

Claims

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Application Information

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IPC IPC(8): G01C21/00G01C21/26G08G1/01G08G1/09G08G1/0967G08G1/0968G08G1/0969G08G1/13
CPCG01C21/3691G08G1/0104G08G1/096716G08G1/096872G08G1/096791G08G1/096827G08G1/096758
Inventor ADACHI, SHINYA
Owner PANASONIC CORP
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