CN101777257A - Method and system for obtaining traffic report - Google Patents
Method and system for obtaining traffic report Download PDFInfo
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- CN101777257A CN101777257A CN200910244111A CN200910244111A CN101777257A CN 101777257 A CN101777257 A CN 101777257A CN 200910244111 A CN200910244111 A CN 200910244111A CN 200910244111 A CN200910244111 A CN 200910244111A CN 101777257 A CN101777257 A CN 101777257A
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- 230000008878 coupling Effects 0.000 claims description 31
- 238000010168 coupling process Methods 0.000 claims description 31
- 238000005859 coupling reaction Methods 0.000 claims description 31
- 238000004364 calculation method Methods 0.000 claims description 6
- 240000007594 Oryza sativa Species 0.000 claims description 2
- 235000007164 Oryza sativa Nutrition 0.000 claims description 2
- 235000009566 rice Nutrition 0.000 claims description 2
- 238000010586 diagram Methods 0.000 description 6
- 238000011156 evaluation Methods 0.000 description 5
- 238000007667 floating Methods 0.000 description 5
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- 238000006243 chemical reaction Methods 0.000 description 2
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- G—PHYSICS
- G08—SIGNALLING
- G08G—TRAFFIC CONTROL SYSTEMS
- G08G1/00—Traffic control systems for road vehicles
- G08G1/01—Detecting movement of traffic to be counted or controlled
- G08G1/0104—Measuring and analyzing of parameters relative to traffic conditions
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01C—MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
- G01C21/00—Navigation; Navigational instruments not provided for in groups G01C1/00 - G01C19/00
- G01C21/26—Navigation; Navigational instruments not provided for in groups G01C1/00 - G01C19/00 specially adapted for navigation in a road network
- G01C21/28—Navigation; Navigational instruments not provided for in groups G01C1/00 - G01C19/00 specially adapted for navigation in a road network with correlation of data from several navigational instruments
- G01C21/30—Map- or contour-matching
Abstract
The invention discloses a method and a system for obtaining a traffic report, relating to the intelligent traffic filed and designed for obtaining the traffic report with high accuracy. The method for obtaining the traffic report comprises the steps of: collecting path source data, wherein the path source data comprise position points and information corresponding to the position points; carrying out map matching on the path source data, determining candidate sections of map positions corresponding to the position points; carrying out path speculation on the position points subjected to the map matching, determining matched sections from the candidate sections; traversing the position points on the matched sections, and obtaining a traffic state report of the matched sections. The invention also discloses a system for obtaining the traffic report by applying the method. The invention is used for obtaining the traffic report.
Description
Technical field
The present invention relates to intelligent transportation field, relate in particular to a kind of method and system of obtaining traffic information.
Background technology
The main thought of intelligent transportation system (Intelligent Transport System) is to regard traditional traffic system as people, car, the entity on road, the utilization computing machine, communication, artificial intelligence, the advanced achievement in fields such as sensor thoroughly changes the traffic situation of present passive type, make the people in driving procedure, can pass through GPS/GIS at any time, broadcasting, means such as information issue plate are understood present traffic, vehicle supervision department then can be by the vehicle sensors on the road, equipment such as video camera are understood the traffic conditions in each highway section at any time, and at any time the traffic signals of each traffic intersection are adjusted and carried out information issue to external world, make the traffic capacity of whole traffic system reach maximum.
In traditional acquisition traffic information method, traffic information can obtain by artificial visually examine's method, but adopts the method to exist the human cost height, the shortcoming that visual range is limited, and also range estimation personnel's subjectivity is strong, and can not objective reaction road conditions.
The method of obtaining traffic information can also obtain by image capture device, but the cost height of image capture device, being limited in scope of data acquisition.
One of method of obtaining traffic information that adopts in the international in recent years intelligent transportation system (ITS) is the Floating Car technology, its ultimate principle is: according to the vehicle location of Floating Car periodic logging in the vehicle ' process of equipping vehicle-bone global positioning system (GPS), direction and velocity information, application comprises that path culculating handles with relevant computation model and algorithms such as road traffic congestion information calculating, thereby Floating Car position data and urban road are associated on time and space, finally obtain the traffic congestion information such as driving hourage of the Vehicle Speed of road that Floating Car is passed through and road.
But existing Floating Car technology exists the problem of information accuracy difference.
Summary of the invention
Problem to be solved by this invention provides a kind of method of obtaining traffic information, can the high traffic information of accuracy.
For reaching above-mentioned technical purpose, the present invention obtains the method for traffic information, and the technical scheme of employing is:
A kind of method of obtaining traffic information comprises:
Gather the path source data, the path source data comprises the information of location point and location point correspondence; The path source data is carried out map match, determine the candidate road section of each location point corresponding map position; Each location point through map match is carried out path culculating, from each candidate road section, determine the coupling highway section; Traversal is respectively mated the location point on the highway section, obtains the road status messages in coupling highway section.
The method of obtaining traffic information of the present invention by the such scheme description, in map match and path culculating process, carry out path culculating again owing to determine candidate road section earlier, improved the accuracy of path culculating, reduce the difficulty of path culculating, thereby can obtain the high road status messages of accuracy.Because the traffic information accuracy height that adopts the present invention program to obtain, can be used as the evaluation criterion of the traffic information that other modes gather.
The present invention also provides a kind of system that obtains traffic information, can access the high traffic information of accuracy.
For reaching above-mentioned technical purpose, the present invention obtains the system of traffic information, and the technical scheme of employing is:
A kind of system that obtains traffic information comprises: collecting device, be used to gather the path source data on the programme path, and the path source data comprises the information of location point and location point correspondence; The cartographic information unit is used to provide the positional information in each highway section on the map; Information process unit, the positional information that is used for each highway section on the path source data that will gather and the map is related, determines road status messages.
The system that obtains traffic information of the present invention by the such scheme description, can select candidate road section in the map match unit, improve the accuracy of path culculating, reduced the path culculating unit and carried out the difficulty of path culculating, thereby can obtain the high road condition letter of accuracy.The road status messages accuracy height that adopts the system that obtains traffic information among the present invention program to obtain can be used as the evaluation criterion of the traffic information that other modes gather.
Description of drawings
Fig. 1 obtains the method flow diagram of traffic information for the embodiment of the invention;
Fig. 2 carries out the map match process flow diagram for the embodiment of the invention to the path source data;
Fig. 3 calculates synoptic diagram for embodiment of the invention candidate road section;
Fig. 4 carries out the path culculating process flow diagram for each location point of the embodiment of the invention;
Each location point of Fig. 5 embodiment of the invention carries out path culculating process flow diagram in the time slice;
Fig. 6 embodiment of the invention is obtained the system chart of traffic information.
Embodiment
The method of the embodiment of the invention being obtained traffic information below in conjunction with accompanying drawing is described in detail.
As shown in Figure 1, the embodiment of the invention method of obtaining traffic information comprises:
S1, collection path source data, the path source data comprises the information of location point and location point correspondence;
S2, the path source data is carried out map match, determine the candidate road section of each location point corresponding map position;
S3, to carrying out path culculating through each location point of map match, from each candidate road section, determine the coupling highway section;
S4, traversal are respectively mated the location point on the highway section, obtain the road status messages in coupling highway section.
By the method for obtaining traffic information of the present invention that such scheme is described, in map match and path culculating process, carry out path culculating again owing to determine candidate road section earlier, the accuracy that has improved path culculating has reduced the difficulty of path culculating.The road status messages accuracy height that adopts the present invention program to obtain, thus can be used as the evaluation criterion of the traffic information that other modes gather.
Below in conjunction with specific embodiment the method that the present invention obtains traffic information is specifically described:
S1, collection path source data, the path source data comprises the information of location point and location point correspondence.
Wherein, the information of location point correspondence comprises the longitude of Vehicle Speed, travel direction, running time, location point and the latitude of location point.
Need to prove, gather before the source data of path that this method also comprises the planning real route of walking of driving, the real route of walking of driving is at least one TMC canonical path or at least one RTIC canonical path.If adopt the evaluation criterion of the traffic information that traffic information that the method for the invention obtains gathers as other modes, estimate for convenient so, when planning drives to walk route in fact, should choose the different route of road conditions complexity, the wider as far as possible general route of choosing, for example, the embodiment of the invention is to be to be base unit with the TMC standard to estimate number, and then programme path is chosen complete TMC route to greatest extent as the drive test circuit.
Further, gather the path source data and carry out the collection of path source data for adopting GPS equipment, the frequency acquisition of location point is 1-2 second, and the location point of gathering in the chronomere is many more, and the path source data is accurate more, and the present embodiment per second is gathered a location point.
Be the reaction road condition of closing to reality more, the selection of drive test time will comprise 7 point-10 point early, evening peak traffic period morning that afternoon, 4-7 was ordered.
During actual drive test, the driver drives, and is the real embodiment traffic flow modes, can not the people for travelling fast or slowly.The collection personnel adopt GPS equipment to gather the path source data, article one, after the collection of TMC canonical path finishes, suspend and gather the path source data, when entering next bar planning route running, begin again to gather the path source data, avoid a highway section repeated acquisition is increased map match and path culculating difficulty.After all route path Source Data Acquisitions finish, in time derive gps data.
S2, as shown in Figure 2 describedly carries out map match to the path source data, determines the candidate road section of each location point corresponding map position, specifically comprises:
S201, the path source data is carried out pre-service, filter invalid path source data.
Wherein, invalid path source data comprises the location point that acquisition time repeats, with the acquisition time interval of the adjacent position point location point greater than the time threshold values.
Further, the time threshold values is 10 times of the frequency acquisition described in the S1.
Because GPS hardware device problem can occur in same time point, duplicates the phenomenon of location point.So filter out invalid location point, can improve the efficient of subsequent step.
Simultaneously, location point and corresponding information thereof are carried out initialization, for steps such as map match and path culculating are got ready.
Further, the path source data being carried out map match comprises:
The projector distance in S202, calculating location point and each highway section of map and location point are to the direction vector of the next position point and the angle in each highway section of map.
Particularly, as shown in Figure 3, candidate road section is calculated synoptic diagram, location point to be matched is done projection to the highway section of all roads of map, calculate the projector distance di between each location point and each highway section, Fig. 3 is that projection and the angle of location point to a highway section calculates signal, and promptly location point i arrives the vertical line distance of highway section r, and the angle theta i between vehicle heading and road.Angle between vehicle heading and road is all thought 0 degree with direct north, and clockwise for just, promptly the due east direction is 90 to spend.β i is location point i to the line of the next position point i+1 angle with respect to direct north, and β r represents the angle of highway section r and direct north, then the angle theta i=| β i-β r| between vehicle heading and road.
S203, projector distance less than distance threshold values and angle less than the highway section of angle threshold values candidate road section as location point.
Wherein, be 40-100 rice apart from threshold values, be preferably 60 meters, the angle threshold values is the 30-65 degree, preferred 45 degree.
If less than angle threshold, then this location point produces preliminary matching result in the highway section to projector distance di therewith, thinks that vehicle just travels on this highway section less than distance threshold and angle theta i, subpoint is as the match point of vehicle on the highway section.
S3, as shown in Figure 4 describedly carries out path culculating to each location point through map match, determines the coupling highway section from each candidate road section, specifically comprises:
S301, determine the weighted value of each candidate road section.
Select di, θ i value is less than all highway sections of given threshold value, and calculates the weighted value λ i of each candidate road section according to following formula.
λi＝ωd*di/DistMax+ωθ*θi/AngleMax
Wherein, DistMax is apart from threshold values, AngleMax is the angle threshold values, ω d, ω θ are respectively the weights of projection line segment length and angular separation, ω d+ ω θ=1 wherein, ω d and ω θ choose according to projector distance and angle and in calculate in the coupling highway section correct sex importance are decided, and they are empirical value, generally choosing ω d is 0.6, and ω θ is 0.4.All candidate road section are sorted by weighted value λ i size so that the path culculating of back uses, the highway section that weighted value λ i is more little, for the possibility in true walking highway section big more.
S302, the path source data is carried out time slice by break time.
Wherein, refer to that a path Source Data Acquisition on the route is accomplished to the time interval that the path Source Data Acquisition on next bar route begins break time, the coupling highway section of location point is communicated with in the time slice.
Further,, determine that from each candidate road section the coupling highway section comprises to carrying out path culculating through each location point of map match, from the candidate road section of two location points, choose at most total at least and highway section that weight is minimum as the coupling highway section.
S303, as shown in Figure 5 carries out the path culculating of location point in the time slice.
Below in conjunction with embodiment the path culculating idiographic flow in the time slice is described.
S3031, first location point that candidate road section is arranged is set is starting point.
S3032, choose location point that the first five has candidate road section, obtain to have maximum in the candidate road section of described the first five location point and the highway section weighted value minimum as the preliminary election highway section, enter step S3034;
As if five of the location point less thaies that candidate road section was arranged in this period, then enter step S3033.
S3033, will have the location point of candidate road section all to choose, total maximum in the chosen position point candidate road section, the highway section of weighted value minimum is as the coupling highway section.Then the path culculating in this time slice finishes, and enters the path culculating in next time slice, repeating step S3031.
S3034, read the location point that the next one has candidate road section;
If next have the location point of candidate road section not exist, then enter step S3035,
If next have the location point of candidate road section to exist, enter step S3036.
S3035, starting point are set to mate the highway section to the preliminary election highway section of current point.Then the path culculating in this time slice finishes, and enters the path culculating in next time slice, repeating step S3031.
S3036, determine whether comprise the preliminary election highway section in the candidate road section of this location point;
If comprise the preliminary election highway section, then repeat to enter step S3034, otherwise enter step S3037.
S3037, read after ten location points that candidate road section is arranged, if ten of location point less thaies are afterwards then all chosen for ten;
If comprise the preliminary election highway section in the candidate road section of these ten location points (ten of less thaies are all chosen), then enter step S3034; Otherwise enter step S3038.
S3038, starting point are set to mate the highway section in the preliminary election highway section of any before the current point, and current point is set to new starting point, enters step S3039.
S3039, begin the candidate road section of follow-up five points, be communicated with before preliminary election highway section from the new starting point described in the step S3038, and total maximum in the candidate road section, the highway section of weighted value minimum enters step S3034 as the preliminary election highway section.
S4, traversal are respectively mated the location point on the highway section, obtain the road status messages in coupling highway section.
Add up the dot information of the location point correspondence on each bar coupling highway section, obtain the information such as speed, hourage, road condition of corresponding period on this coupling highway section.
Add up every coupling on the highway section location point and during corresponding information, more accurate in order to make the result, need deduction to wait for the time of traffic lights, the deduction principle be deduction apart from the crossing less than certain value, and the lower location point of velocity amplitude.
The road status messages that obtains according to the method described in the present invention can be used as metewand and estimates the road conditions traffic data that adopts alternate manner to obtain.
As shown in Figure 6, the embodiment of the invention also provides a kind of system that obtains traffic information, and the system that this obtains traffic information comprises drive test vehicle 1, is used for travelling on programme path; Collecting device 2, collecting device 2 is loaded on the drive test vehicle 1, is used to gather the path source data, and the path source data comprises the information of location point and location point correspondence; Cartographic information unit 3 is used to provide the positional information in each highway section on the map; Information process unit 4, the positional information that is used for each highway section on the path source data that will gather and the map is related, determines road status messages.
Further, programme path is at least one TMC canonical path or at least one RTIC canonical path.
Further, the information of location point correspondence comprises the longitude of Vehicle Speed, travel direction, running time, location point and the latitude of location point.
Further, collecting device is the GPS collecting device, and frequency acquisition is 1-2 second.
Further, information process unit 4 comprises, map-matching module 401 is used for determining the candidate road section of the corresponding map location of each location point; Path culculating module 402 is used for determining the coupling highway section from each candidate road section; Information Statistics module 403 is used to travel through the location point that respectively mates on the highway section, obtains the road status messages in coupling highway section.
Further, information process unit also comprises pretreatment module, is used to handle invalid path source data, and described invalid path source data comprises the location point that acquisition time repeats, with the acquisition time interval of the adjacent position point location point greater than the time threshold values.
Further, map-matching module 401 comprises, position calculation submodule 4011, highway section chooser module 4012 and weight calculation submodule 4013.
Further, the path culculating module comprises, submodule is inferred in the highway section, be used for from the candidate road section of at least two location points choose at most total and highway section that weight is minimum as the coupling highway section.
Further, the path culculating module also comprises, the time slice submodule is used for by break time the path source data being carried out time slice.
Refer to that the path Source Data Acquisition on the route in the programme path is accomplished to the time interval that the path Source Data Acquisition on next bar route begins break time, the coupling highway section of location point is communicated with in the time slice.
By the system that obtains traffic information of the present invention that such scheme is described, frequency acquisition is fast, thereby has guaranteed that image data has higher accuracy, can select candidate road section in the map match unit, has reduced the difficulty that the path culculating unit carries out path culculating; The final coupling highway section accuracy height that adopts map-matching module among the present invention program and path culculating module to obtain, thus can be used as the evaluation criterion of the traffic information that other modes gather.
The above; only be the specific embodiment of the present invention, but protection scope of the present invention is not limited thereto, anyly is familiar with those skilled in the art in the technical scope that the present invention discloses; can expect easily changing or replacing, all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection domain of described claim.
Claims (19)
1. a method of obtaining traffic information is characterized in that, comprising:
Gather the path source data, described path source data comprises the information of location point and location point correspondence;
Described path source data is carried out map match, determine the candidate road section of each described location point corresponding map position;
Each described location point through map match is carried out path culculating, from each described candidate road section, determine the coupling highway section;
Travel through the location point on each described coupling highway section, obtain the road status messages in described coupling highway section.
2. according to the right 1 described method of obtaining traffic information, it is characterized in that, described path source data carried out map match, determine that the candidate road section of each described location point corresponding map position comprises:
Calculate the projector distance in described location point and each highway section of map and described location point to the direction vector of the next position point and the angle in each highway section of described map;
Described projector distance less than distance threshold values and described angle less than the highway section of angle threshold values candidate road section as described location point.
3. according to the right 1 described method of obtaining traffic information, it is characterized in that described each described location point to the process map match carries out path culculating, determine that from each described candidate road section the coupling highway section comprises:
Determine the weighted value of each described candidate road section;
From the candidate road section of at least two location points, choose total at most and the minimum highway section of weight as the coupling highway section.
4. according to the right 1 described method of obtaining traffic information, it is characterized in that: described collection path source data is carried out the collection of path source data for adopting GPS equipment, and the frequency acquisition of described location point is 1-2 second.
5. according to the right 1 described method of obtaining traffic information, it is characterized in that, described described path source data is carried out map match, calculate before the candidate road section of each described location point corresponding map position, this method also comprises:
Described path source data is carried out pre-service, filter invalid path source data, wherein said invalid path source data comprises the location point that acquisition time repeats, with the acquisition time interval of the adjacent position point location point greater than the time threshold values.
6. according to the described method of obtaining traffic information of claim 1, it is characterized in that, described each described location point to the process map match carries out path culculating, from each described candidate road section, determine the coupling highway section, comprise: described path source data is carried out time slice by break time, refer to that a path Source Data Acquisition on the route is accomplished to the time interval that the path Source Data Acquisition on next bar route begins described break time, the coupling highway section of described location point is communicated with in the time slice.
7. according to the described method of obtaining traffic information of claim 1, it is characterized in that: the information of described location point correspondence comprises the longitude of Vehicle Speed, travel direction, running time, location point and the latitude of location point.
8. according to the described method of obtaining traffic information of claim 2, it is characterized in that: described is 40-100 rice apart from threshold values.
9. according to the described method of obtaining traffic information of claim 2, it is characterized in that: described is 60 meters apart from threshold values.
10. according to the described method of obtaining traffic information of claim 2, it is characterized in that: described angle threshold values is the 30-65 degree.
11. according to the described method of obtaining traffic information of claim 5, it is characterized in that: described time threshold values is 10 times of frequency acquisition, and described frequency acquisition is 1-2 second.
12. a system that obtains traffic information is characterized in that, comprising:
Collecting device, described collecting device are used to gather the path source data on the programme path, and described path source data comprises the information of location point and location point correspondence;
The cartographic information unit is used to provide the positional information in each highway section on the map;
Information process unit, the positional information that is used for each highway section on the path source data that will gather and the described map is related, determines road status messages.
13. according to the described system that obtains traffic information of claim 12, it is characterized in that: described information process unit comprises:
Map-matching module is used for determining the candidate road section of the corresponding map location of each described location point;
The path culculating module is used for determining the coupling highway section from each described candidate road section;
The Information Statistics module is used to travel through the location point on each described coupling highway section, obtains the road status messages in described coupling highway section.
14. according to the described system that obtains traffic information of claim 13, it is characterized in that: described map-matching module comprises:
The position calculation submodule is used to calculate the projector distance in described location point and each highway section and the described location point angle to the next position point vector direction and each highway section of described map;
Highway section chooser module, be used for determining projector distance less than distance threshold values and described angle less than the highway section of angle threshold values candidate road section as described location point.
15., it is characterized in that described path culculating module comprises according to the described system that obtains traffic information of claim 13:
The weight calculation submodule is used for determining the weighted value of each described candidate road section;
Submodule is inferred in the highway section, be used for from the candidate road section of at least two location points choose at most total and highway section that weight is minimum as the coupling highway section.
16. according to claim 13 or the 15 described systems that obtain traffic information, it is characterized in that, described path culculating module also comprises: the time slice submodule, be used for described path source data being carried out time slice by break time, refer to that the path Source Data Acquisition on the route in the described programme path is accomplished to the time interval that the path Source Data Acquisition on next bar route begins described break time, the coupling highway section of described location point is communicated with in the described time slice.
17. according to the described system that obtains traffic information of claim 12, it is characterized in that: described collecting device is the GPS collecting device, frequency acquisition is 1-2 second.
18. according to the described system that obtains traffic information of claim 13, it is characterized in that: described information process unit also comprises pretreatment module, be used to handle invalid path source data, described invalid path source data comprises the location point that acquisition time repeats, with the acquisition time interval of the adjacent position point location point greater than the time threshold values.
19. according to the described system that obtains traffic information of claim 12, it is characterized in that: the information of described location point correspondence comprises the longitude of Vehicle Speed, travel direction, running time, location point and the latitude of location point.
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| CN 200910244111 CN101777257B (en) | 2009-12-29 | 2009-12-29 | Method and system for obtaining traffic report |
| PCT/CN2010/079528 WO2011079693A1 (en) | 2009-12-29 | 2010-12-07 | Method and system for obtaining traffic information |
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| CN 200910244111 CN101777257B (en) | 2009-12-29 | 2009-12-29 | Method and system for obtaining traffic report |
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