CN104376712B - Lack transport information complementing device and its method - Google Patents
Lack transport information complementing device and its method Download PDFInfo
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- CN104376712B CN104376712B CN201310359209.2A CN201310359209A CN104376712B CN 104376712 B CN104376712 B CN 104376712B CN 201310359209 A CN201310359209 A CN 201310359209A CN 104376712 B CN104376712 B CN 104376712B
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Abstract
The present invention provides a kind of missing transport information complementing device and its method, and missing transport information complementing device (200) includes：Current traffic sample generation unit (210), the target road chain for lacking traffic information data, Current traffic sample is generated according to the traffic information data of current time and the Zhou Bianlu chains of target road chain；Historical traffic sample comparing unit (220), the Current traffic sample is compared with multiple historical traffic samples of target road chain, the diversity factor of the Current traffic sample and each historical traffic sample is calculated, the historical traffic sample of the less predetermined quantity of diversity factor is obtained；And filling Data Computation Unit (230), according to the historical traffic sample of the predetermined quantity obtained by the historical traffic sample comparing unit (220), calculate the data for filling the transport information that target road chain is lacked.
Description
Technical field
The present invention relates to intelligent transportation field, more particularly, to one kind missing transport information complementing device and its method.
Background technology
In recent years, traffic-information service has been progressed among daily life.The service can be provided to the public
The transport information such as traffic congestion situation, travelling speed, hourage on road, help people to formulate plan of travel, and avoidance is gathered around
It is stifled, improve out line efficiency.
Generally, above-mentioned transport information (jam level, travelling speed, hourage of each road etc.) can be by floating
The source such as car, monitoring camera, ground coil, trackside sensor, which obtains and calculated, to be processed.But, because above-mentioned data are adopted
Transport information on the reason such as acquisition means coverage rate is not enough, failure or collection environment are not suitable for, road occasionally there are shortage of data
Phenomenon.It is embodied in：From spatially, at a time, have on some roads and do not handed on transport information, some roads
Communication breath；From the time, on certain road, there are transport information some periods, and some periods do not have transport information.
For the missing problem of transport information, prior art (Chinese Patent Application No. CN201010212549.9) is using such as
Lower method fills up missing data.By the peripheral path of current missing information road (calling in the following text " target road ") according to target road
Position relationship be divided into：Same circuit, parallel circuit, other, these three types.Then, at the time of with current missing information
Belong in same date type (working day/holiday etc.), the historical data in the same period, calculate the week of three of the above type
By-pass road and the degree of correlation of present road.Sorted according to the size of all types of peripheral paths and the present road degree of correlation, using working as
The average filling missing information of transport information on transport information and degree of correlation highest that class peripheral path is carved with when preceding.
But, there are the following problems in the above prior art：
First, the transport information of filling is according to the numerical value once occurred on the numerical value rather than present road on peripheral path
Calculate.Even if therefore the peripheral path degree of correlation is judged as highest, also not necessarily it is adapted to present road.
Second, when also all shortage of data occurs for the peripheral path of target road just, prior art can not be to target
Missing data is filled on road.
Patent document 1：CN201010212549.9
The content of the invention
The present invention is researched and developed in view of the above problems, and its object is to provide a kind of missing transport information complementing device and its side
Method, utilizes the transport information meter on same path in one or more historical traffic samples most like with Current traffic sample
Calculate Filling power.Compared with prior art, on the one hand, the filling data of calculating are more suitable for present road, more accurate；On the other hand,
When the part or all of peripheral path of target road is there is also during shortage of data, data filling still can be carried out, so that
Transport information after filling has higher coverage rate compared with prior art.
To achieve these goals, the present invention proposes a kind of missing transport information complementing device, it is characterised in that bag
Include：Current traffic sample generation unit, the target road chain for lacking traffic information data, according to current time and the mesh
Mark the traffic information data generation Current traffic sample of the Zhou Bianlu chains of road chain；Historical traffic sample comparing unit, described will work as
Preceding traffic sample calculates the Current traffic sample with each going through compared with multiple historical traffic samples of target road chain
The diversity factor of history traffic sample, obtains the historical traffic sample of the less predetermined quantity of diversity factor；And filling data calculate single
Member, according to the historical traffic sample of the predetermined quantity obtained by the historical traffic sample comparing unit, is calculated for filling out
Fill the data for the transport information that target road chain is lacked.
In addition, the missing transport information complementing device of the present invention is characterised by, the diversity factor is according to described current
Traffic sample is calculated with the difference of transport information in the difference and Zhou Bianlu chains at historical traffic sample respective time point
's.
In addition, the present invention missing transport information complementing device be characterised by, the Zhou Bianlu chains, including with the mesh
Upstream road chain and downstream road chain that mark road chain is joined directly together.
In addition, the present invention missing transport information complementing device be characterised by, the Zhou Bianlu chains, including with the mesh
Mark the distance of road chain within the specific limits and the upstream road chain being directly or indirectly connected with target road chain and downstream road
Chain.
In addition, the missing transport information complementing device of the present invention is characterised by, using diversity factor to being handed over by the history
The traffic information data of target road chain enters described in the historical traffic sample for the predetermined quantity that logical sample comparing unit is obtained
Row weighted average, obtains the data for filling the transport information that target road chain is lacked.
In addition, the missing transport information complementing device of the present invention is characterised by, the Current traffic sample, including missing
Traffic information data on the time point of traffic information data and each Zhou Bianlu chains.
In addition, the missing transport information complementing device of the present invention is characterised by, the historical traffic sample, including history
Historical traffic information data on time point, target road chain and each Zhou Bianlu chains.
In addition, to achieve these goals, the present invention proposes a kind of missing transport information complementing method, its feature exists
In, including：Current traffic sample generation step, the target road chain for lacking traffic information data, according to current time and
The traffic information data generation Current traffic sample of the Zhou Bianlu chains of target road chain；Historical traffic sample comparison step, will
The Current traffic sample compared with multiple historical traffic samples of target road chain, calculate the Current traffic sample with
The diversity factor of each historical traffic sample, obtains the historical traffic sample of the less predetermined quantity of diversity factor；And filling data
Calculation procedure, according to the historical traffic sample of the predetermined quantity obtained by the historical traffic sample comparison step, is calculated
Data for filling the transport information that target road chain is lacked.
In accordance with the invention it is possible to obtain following advantageous effects.
The data of filling are calculated according to the historical traffic information once occurred on same path, are made with prior art
Compared with the transport information filling of peripheral path, filling data are more suitable for present road, it is more accurate reliable.
In addition, in the diversity factor of calculating and historical data, not only allowing for the friendship of current sample and historical traffic sample
Communicate the difference ceased, it is also considered that to both differences on time point.Therefore it is also complete even if on the Zhou Bianlu chains of target road chain
Portion has lacked transport information, and the filling work of target road chain can also be carried out.Therefore compared with prior art, there are more missings
Data can be padded, and improve the transport information coverage rate after filling up.
Brief description of the drawings
By reference to following combination accompanying drawing to the detailed description of the preferred embodiment used, above-mentioned mesh of the invention
, advantages and features will become more apparent from, wherein：
Fig. 1 is missing from the system construction drawing of transport information complementing device and inputoutput data.
Fig. 2 is the schematic diagram of certain target road chain and its Zhou Bianlu chains.
Fig. 3 is Current traffic sample A example.
Fig. 4 is the example of a historical traffic sample B.
Fig. 5 is that sample A is contrasted with sample B and calculated the example of diversity factor.
Fig. 6 is sample A and its four immediate historical traffic sample B 1-B4 diversity factor, the example of weight.
Embodiment
In the present invention, the chain of passing by one's way of the path link in map is represented.In the art, " road chain " is to constitute road network
Directed edge [ISO19133], the direction of road chain represents the travel direction of vehicle.
In the present invention, missing transport information complementing device is by calculating between Current traffic sample and historical traffic sample
Diversity factor, find the less predetermined quantity of diversity factor historical traffic sample.For example, being sorted from small to large by diversity factor, take
Ranking most forward predetermined quantity (one or more) historical traffic sample.Wherein, the diversity factor between two samples is represented
The two degree having differences.In the present invention, diversity factor be according to two samples each the difference at time point, on Zhou Bianlu chains
The difference of transport information (such as the travelling speed on the chain of road) is calculated.In the calculating process of diversity factor, it is allowed to current or go through
There is also the missing of transport information on one or more week wing chain of target road chain in history traffic sample.Hereinafter, for difference
The historical traffic sample of less predetermined quantity is spent, one or more history of diversity factor minimum (closest) are also expressed as sometimes
Traffic sample.
In addition, " the Zhou Bianlu chains " in the present invention refers to, the upstream road chain being joined directly together with target road chain and downstream road
Chain.In addition, " the Zhou Bianlu chains " in the present invention can also refer to and target road chain distance within the specific limits and directly or between
Connect the upstream road chain being connected with target road chain and downstream road chain.
According to the present invention, finding with after the immediate multiple historical traffic samples of Current traffic sample, most being connect to described
The transport information of target road chain is weighted averagely near historical traffic sample, is finally given for filling missing data
Value.
Below, embodiments of the present invention are described in detail with reference to the accompanying drawings.
Below, the system composition of the present invention is illustrated.
Fig. 1 is missing from the system construction drawing of transport information complementing device and inputoutput data.Structure chart shown in Fig. 1
In, including missing transport information complementing device, I/O data base.Specifically, the structure chart includes a missing traffic
Transport information (also referred to as " traffic information database before filling ") before information complementing device 200, map datum 110, filling
120th, the transport information (also referred to as " traffic information database after filling ") 310 after historical traffic data storehouse 130, filling.Its
In, missing transport information complementing device 200 is the main body of the present invention；Transport information 120, history before map datum 110, filling
Traffic database 130 is the input data of device；Transport information 310 after filling is the output data of device.
First, input data is illustrated.
Map datum 110, that is, calculate, the cartographic information needed for distributing traffic information, including the numbering of road chain, position, road
Connected relation between chain etc..
Traffic information database 120 before filling is pending, there is the transport information of missing data.Each of which
Bar record includes time, road chain numbering, transport information (travelling speed, hourage or jam level etc.) of issue etc..
Historical traffic data storehouse 130, houses the transport information of history, and these information are used to carry for the completion of missing data
The historical traffic sample for for referring to.
Next, being illustrated to missing transport information complementing device 200, it is the system of subject of the present invention.Its work(
It can include：According to the road chain of missing transport information and its Zhou Bianlu chains generation Current traffic sample to be filled and then and history
Sample in database calculates diversity factor, finds one or more historical traffic samples of diversity factor minimum (i.e. closest), most
Exported afterwards by the final Filling power of weighted average calculation.
Lack transport information complementing device 200 more single including Current traffic sample generation unit 210, historical traffic sample
Member 220, filling Data Computation Unit 230.These units are illustrated separately below.
The function of Current traffic sample generation unit 210 is to search its week wing chain for every road chain for having lacked data to work as
Preceding transport information, generates a Current traffic sample.
The function of historical traffic sample comparing unit 220 is to carry out the data in Current traffic sample and historical data base
Contrast, calculates the diversity factor of historical traffic sample and Current traffic sample, and screening obtains one or more diversity factoies minimums (i.e.
It is closest) historical traffic sample.
The function of filling Data Computation Unit 230 is according to being found in historical traffic sample comparing unit 220 and current
The immediate one or more historical traffic samples of traffic sample, calculate the numerical value of the current missing transport information of final filling.
Finally, the traffic information database 310 after filling is illustrated.Traffic information database 310 after filling is deposited
The traffic information results after completion are stored up.Data format is identical with the traffic information database 120 before filling, but part is former
The transport information first lacked is filled up.
Next, the specific implementation step to embodiment is illustrated.
Implementation steps can be divided into the generation of Current traffic sample, historical traffic sample and compare, fill three portions of data calculating
Point.Illustrate individually below.
<Current traffic sample is generated>
The step for " generation of Current traffic sample ", is completed by the Current traffic sample generation unit 210 in Fig. 1.This step
Rapid function is to generate a Current traffic sample for the record of every missing data, wherein containing the time point of missing data
And the transport information on Zhou Bianlu chains.
Illustrate the generation method of Current traffic sample by taking Fig. 2 as an example below.L0 has been missing from the target road of data in Fig. 2
Chain, L1 to L5 is five Zhou Bianlu chains being joined directly together with target road chain L0.Assuming that current time is 10:Sent out on 15, L1 to L5
The velocity amplitude of cloth is respectively：Missing, 45km/h, 25km/h, missing, 15km/h.So system can generate one such as Fig. 3 for this
Shown Current traffic sample A, wherein TARepresent current time, SA1To SA5Represent the velocity amplitude on the chain L1 to L5 of road, symbol
" * " represents TAVelocity amplitude of the moment on certain road chain is lacked.
So far, the step of Current traffic sample is generated is terminated.
<Historical traffic sample compares>
The step for " historical traffic sample compares ", is completed by the historical traffic sample comparing unit 220 in Fig. 1.This step
Rapid function is to be contrasted Current traffic sample with the data in historical data base, calculates historical traffic sample and current friendship
The diversity factor of logical sample, and screen the historical traffic sample for obtaining one or more diversity factoies minimum (i.e. closest).
First, the historical traffic sample of target road chain and its Zhou Bianlu chains in historical traffic data storehouse 130 is found.Every
The information that historical traffic sample is included has：Historical traffic information on historical juncture point, target road chain and its every Zhou Bianlu chain
(travelling speed such as on this road chain).Compared with Current traffic sample, added in historical traffic sample on the chain of target road
Transport information.
In the present invention, in order to which in the historical traffic sample that needed for algorithm, searches out, the transport information on the chain of target road must
There must be value, and the transport information on Zhou Bianlu chains then allows have missing.Fig. 4 gives showing for historical traffic sample B
Example, SB0It is 40km/h, T to represent the speed on the chain of target roadBPoint is 10 at the time of representative sample:30, SB1To SB5Represent on periphery
Speed on the chain of road is respectively：39km/h, 30km/h, 20km/h, missing, 13km/h.
Next, calculating the diversity factor of historical traffic sample and Current traffic sample one by one.With foregoing Current traffic sample
This A is with exemplified by historical traffic sample B, being described below and how calculating the diversity factor of the two.
Formula 1 gives the method for calculating sample A and B diversity factor.DistABRepresentative sample A and B diversity factor, DTRepresent
The diversity factor that time difference according to two samples is calculated, DSRepresent the diversity factor calculated according to the speed difference of two samples, WTWhen being
Between weighted value of the factor when diversity factor is calculated, be an adjustable parameter, by changing WTCan be with adjustment time factor and speed
Degree factor is calculating DistABWhen significance level, N represents the Zhou Bianlu chains sum of target road chain, and in such as this example, target road chain has
5 Zhou Bianlu chains, therefore N=5.
(formula 1)
D in formula 1TIt can be calculated by formula 2：
DT=(TA-TB)2(formula 2)
Preferably, TAWith TBDifference unit be " minute ".In addition it is also possible to use other times list according to actual conditions
Position.
D in formula 1SIt can be calculated by formula 3 and formula 4：
(formula 3)
(formula 4)
N wherein in formula 3blank(Nblank≤ N) represent there is the Zhou Bianlu chains of missing in sample A or sample B
Number.Such as by taking the sample A and sample B that are demonstrated in Fig. 5 as an example, because on L1 and L4 this two road chains, sample A or sample B are present
Shortage of data (shows as S1 and the row of S4 two has * values), therefore Nblank=2.
DAB in formula 3 and formula 4jRepresent on j-th strip Zhou Bianlu chains, the speed difference between sample A and sample B.
If SAjOr SBjIn any one be missing from, then DABjIt is 0；Otherwise, DABjIt is both differences.Fig. 5 gives basis
One example of the DAB results that sample A and B are calculated.
Formula 5 gives an example results for calculating the diversity factor of sample A and sample B in Fig. 5, it is assumed that
(formula 5)
After diversity factor of the Current traffic sample with each relevant historical traffic sample has been calculated, each historical traffic sample is pressed
According to the order of the diversity factor from small to large, K minimum historical traffic sample of diversity factor is found.Wherein K is one and can adjust
Parameter, can according to practical application scene select optimum value.
It is identical with Current traffic differences between samples degree if there is a plurality of historical traffic sample, cause to determine diversity factor minimum
Need necessarily to be accepted or rejected during K historical traffic sample, then can be according to practical application scene prioritizing selection time difference DTMost
Small, or speed difference DSMinimum, or according to the selection of other Rule of judgment.
So far, the step of historical traffic sample compares terminates.
<Data are filled to calculate>
" filling data are calculated " is completed by the filling Data Computation Unit 230 in Fig. 1.The step for function be according to going through
Found in the history traffic sample comparing unit 220 and immediate multiple historical traffic samples of Current traffic sample, calculate final
The numerical value of the current missing transport information of filling.
The reckoning of Filling power is according to the K immediate historical traffic samples found in historical traffic sample comparing unit 220
Transport information (the corresponding S in such as Fig. 4 of target road chain in thisB0The information of position) by being obtained in the average weighted method of diversity factor
Arrive.
Assuming that being sample B 1, B2 ..., BK with the immediate K historical traffic samples of Current traffic sample A, according to formula
1-4 methods describeds calculate diversity factor respectively D1, D2 ..., the DK of they and sample A.In addition, in these samples target road
Velocity amplitude on chain is respectively S10, S20..., SK0.So it is used to fill the missing velocity amplitude in current sample on the chain of target road
SA0Calculated according to formula 6：
(formula 6)
Wherein W (Di) represents each Si0The weighted value of (i=1,2 ..., K), it is diversity factor Di function.Preferably,
Diversity factor Di is smaller, and weight W (Di) is bigger.Formula 7 gives a kind of W (Di) definition for reference：
(formula 7)
Wherein Dth is acceptable diversity factor threshold value (Di ＜ Dth), and historical traffic sample of the diversity factor not less than Dth is not
The calculating of numerical value can be participated in filling, this is to ensure the degree of accuracy of Filling power.In extreme circumstances, handed over if all of history
If logical differences between samples degree is all not less than Dth, then abandon carrying out data filling to current sample.
The specific example of a calculating Filling power is given below.Assuming that K=4, Dth are 80, pass through historical traffic sample ratio
Relatively find with the immediate 4 historical traffic samples of current sample A respectively as sample B 1 is to shown in B4 in Fig. 6, wherein weight W
Calculated according to formula 7：
So according to formula 6, can calculate Filling power is：
(formula 8)
So far, filling data calculation procedure terminates.
It experienced above-mentioned " generation of Current traffic sample ", " historical traffic sample compares ", " filling data are calculated " three
After individual step, missing transport information complementing device 200 is that the road chain for having lacked transport information has calculated corresponding Filling power,
And the result is output in the traffic information database 310 after filling.
So far, whole system flow terminates.
Next, compared with prior art, illustrating the difference and effect of embodiment of the present invention.
First, the data of filling are calculated according to the historical traffic information once occurred on same path, and existing
Technology is compared using the transport information filling of peripheral path, and filling data are more suitable for present road, more accurate reliable.
Secondly, when calculating the diversity factor of Current traffic sample and historical traffic sample, the design of formula 1 to formula 4 makes
If obtaining current sample on some or all of Zhou Bianlu chains there is also during shortage of data, system still can be to target road chain
Missing data is filled.Therefore, compared with prior art requires to have transport information at least one peripheral path, there is more
Missing data can be padded, and improve the transport information coverage rate after filling up.
(other embodiment)
In foregoing embodiment, the transport information of missing is showed by the form of travelling speed, actually should
In, other kinds of transport information, such as hourage, jam level can also be used.
In foregoing embodiment, the diversity factor of Current traffic sample and historical traffic sample passes through formula 1 to formula 4
Give a kind of with reference to computational methods example.In actual applications, on the premise of without departing from right, can also have
Other forms of expression.
In foregoing embodiment, formula 6 is given when calculating Filling power and a kind of shown in formula 7 refers to calculating side
Method example.In actual applications, on the premise of without departing from right, there can also be other forms of expression.
Although combined the preferred embodiments of the present invention show the present invention above, those skilled in the art will
It will be appreciated that without departing from the spirit and scope of the present invention, various modifications being carried out to the present invention, replaces and changes
Become.Therefore, the present invention should not be limited by above-described embodiment, and should be limited by appended claims and its equivalent.
Claims (8)
1. one kind missing transport information complementing device, it is characterised in that including：
Current traffic sample generation unit, the target road chain for lacking traffic information data, according to current time and described
The traffic information data generation Current traffic sample of the Zhou Bianlu chains of target road chain；
Historical traffic sample comparing unit, by multiple historical traffic sample phases of the Current traffic sample and target road chain
Compare, calculate the diversity factor of the Current traffic sample and each historical traffic sample, obtain the less predetermined quantity of diversity factor
Historical traffic sample；And
Data Computation Unit is filled, is handed over according to the history of the predetermined quantity obtained by the historical traffic sample comparing unit
Logical sample, calculates the data for filling the transport information that target road chain is lacked.
2. missing transport information complementing device according to claim 1, it is characterised in that
The diversity factor, is difference according to the Current traffic sample and historical traffic sample respective time point, Yi Jizhou
The difference of transport information is calculated on wing chain.
3. missing transport information complementing device according to claim 1, it is characterised in that
The Zhou Bianlu chains, including the upstream road chain and downstream road chain being joined directly together with target road chain.
4. missing transport information complementing device according to claim 1, it is characterised in that
The Zhou Bianlu chains, including with the distance of target road chain within the specific limits and directly or indirectly with the mesh
Mark road chain connected upstream road chain and downstream road chain.
5. missing transport information complementing device according to claim 1, it is characterised in that
Using diversity factor in the historical traffic sample of the predetermined quantity obtained by the historical traffic sample comparing unit
The traffic information data of target road chain is weighted averagely, is obtained for filling the traffic letter that target road chain is lacked
The data of breath.
6. missing transport information complementing device according to claim 1, it is characterised in that
Traffic letter on the Current traffic sample, including the time point of missing traffic information data and each Zhou Bianlu chains
Cease data.
7. missing transport information complementing device according to claim 1, it is characterised in that
History on the historical traffic sample, including historical time point, target road chain and each Zhou Bianlu chains is handed over
Logical information data.
8. one kind missing transport information complementing method, it is characterised in that including：
Current traffic sample generation step, the target road chain for lacking traffic information data, according to current time and described
The traffic information data generation Current traffic sample of the Zhou Bianlu chains of target road chain；
Historical traffic sample comparison step, by multiple historical traffic sample phases of the Current traffic sample and target road chain
Compare, calculate the diversity factor of the Current traffic sample and each historical traffic sample, obtain the less predetermined quantity of diversity factor
Historical traffic sample；And
Data calculation procedure is filled, is handed over according to the history of the predetermined quantity obtained by the historical traffic sample comparison step
Logical sample, calculates the data for filling the transport information that target road chain is lacked.
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| CN108062322A (en) * | 2016-11-08 | 2018-05-22 | 北京国双科技有限公司 | A kind of Supplementing Data method and device based on time-tendency graph |
| CN106781484B (en) * | 2016-12-28 | 2020-04-07 | 北京世纪高通科技有限公司 | Processing method and device for tunnel road condition information |
| CN113808384B (en) * | 2020-06-16 | 2023-02-10 | 英业达科技有限公司 | Traffic condition detection method |
| CN111899510B (en) * | 2020-07-28 | 2021-08-20 | 南京工程学院 | Intelligent traffic system flow short-term prediction method and system based on divergent convolution and GAT |
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