WO2012000344A1

WO2012000344A1 - Method, equipment and device for improving accuracy of traffic information

Info

Publication number: WO2012000344A1
Application number: PCT/CN2011/073622
Authority: WO
Inventors: 殷庆丹
Original assignee: 北京世纪高通科技有限公司
Priority date: 2010-06-30
Filing date: 2011-05-03
Publication date: 2012-01-05
Also published as: CN101894467B; CN101894467A

Abstract

A method for improving the accuracy of traffic information comprises: for the Floating Car Data (FCD) of each area to be detected, selecting at least two groups of parameters to respectively calculate the original value of the traffic information (11); analyzing the original value of the traffic information, and adjusting the parameters according to the analysis result so as to obtain the optimal parameter of the FCD of the area to be detected (12); and calculating the traffic information of the area to be detected by using the optimal parameter (13). An equipment and a device for improving the accuracy of traffic information are also provided.

Description

Method, device and device for improving the accuracy of traffic information The application is submitted to the China Intellectual Property Office on June 30, 2010, and the application number is 201010222518. 1. The invention name is "a method for improving the accuracy of traffic information, equipment, The priority of the Chinese Patent Application, the entire disclosure of which is incorporated herein by reference.

Technical field

The invention relates to traffic information processing technology, in particular to a method, device and device for improving the accuracy of traffic information.

Background technique

The collection of traffic information is an important prerequisite for the realization of intelligent transportation. The traditional input and maintenance costs required by the means of collecting traffic information are very large, and the floating car data (FCD) technology is a new type of traffic. Information detection technology is an effective solution to achieve high-cost dynamic traffic information in a large-scale city.

FCD technology uses a floating vehicle (such as a taxi) with Global Positioning System (GPS) positioning function to collect GPS point information, obtain FCD data, and use the relevant parameters to map the information of these GPS points with the electronic map. The link is matched to obtain corresponding traffic information, thereby visually describing the traffic speed condition of the road, and providing the traveler with path navigation under real-time road conditions.

In the process of implementing the present invention, the inventors have found that at least the following problems exist in the prior art: Existing FCD systems use the same parameters for all city FCD data when using parameters to match GPS points to links. The road network conditions of different cities are different, and some parameters, such as the GPS point-to-link projection distance, the angle between the vehicle's driving direction and the link, are very sensitive to the matching of GPS points and links. The error of the parameters can seriously affect the accuracy of the traffic information, resulting in a low accuracy of the traffic information obtained by using the existing scheme.

Summary of the invention

In order to solve the problems existing in the prior art, embodiments of the present invention provide an improvement of traffic information. Method of accuracy, equipment, device.

In order to achieve the above object, embodiments of the present invention use the following technical solutions:

A method for improving the accuracy of traffic information, the method comprising:

For each floating area data FCD data of the area to be tested, at least two sets of parameters are selected to calculate initial values of the traffic information respectively;

An initial value of the traffic information is analyzed, and the parameter is adjusted according to the analysis result to obtain an optimal parameter of the FCD data of the area to be tested;

Calculating traffic information of the area to be tested by using the optimal parameter.

An apparatus for improving the accuracy of traffic information, the apparatus comprising:

a parameter selection unit, configured to calculate the initial value of the traffic information by selecting at least two sets of parameters for the floating car data FCD data of each area to be tested;

An optimal parameter obtaining unit, configured to analyze an initial value of the traffic information, and adjust the parameter according to the analysis result to obtain an optimal parameter of the FCD data of the area to be tested;

And a traffic information calculation unit, configured to calculate, by using the optimal parameter, the communication information of the area to be tested.

A floating car data processing device, the device comprising the above-described device for improving the accuracy of traffic information.

The technical solution provided by the embodiment of the present invention, when performing the matching between the GPS point and the link, localizes the parameters used in the matching, that is, for each area, first selects multiple sets of different parameters, and then combines the area. The specific conditions determine the best parameters for the region, and finally use the best parameters of the region to calculate the traffic information of the region. The technical solution provided by the embodiment of the invention significantly improves the accuracy of the obtained traffic information by using different parameters suitable for the region for different regions. After actual verification, the traffic information obtained by this program is relatively accurate and the effect is very satisfactory. DRAWINGS

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the prior art description will be briefly described below, obviously, the following The drawings in the description are only some of the embodiments of the present invention, and those skilled in the art can obtain other drawings based on these drawings without any creative work.

1 is a flowchart of a method for improving the accuracy of traffic information according to Embodiment 1 of the present invention; FIG. 2 is a schematic diagram of a method for matching a location point according to Embodiment 1 of the present invention;

FIG. 3 is a structural diagram of an apparatus for improving accuracy of traffic information according to Embodiment 3 of the present invention; FIG. 4 is a structural diagram of another apparatus for improving accuracy of traffic information according to Embodiment 3 of the present invention. detailed description

The technical solutions in the embodiments of the present invention are clearly and completely described in the following with reference to the accompanying drawings in the embodiments of the present invention. It is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative efforts are within the scope of the present invention.

Embodiment 1 of the present invention provides a method for improving the accuracy of traffic information. Referring to FIG. 1, the method includes:

11 : For each FCD data of the area to be tested, select at least two sets of parameters to calculate the initial values of the traffic information.

12: Analyze the initial value of the traffic information, and adjust the parameter according to the analysis result to obtain an optimal parameter of the FCD data of the to-be-tested area.

13: Calculate traffic information of the area to be tested by using the optimal parameter.

Further, the above traffic information includes, but is not limited to, travel time and congestion status. Each of the above parameters includes, but is not limited to, a GPS point-to-link projection distance (hereinafter referred to as a projection distance) and an angle between the vehicle traveling direction and the link (hereinafter referred to as an angle;).

The projection distance and angle are very sensitive to the matching of GPS points and links. The error of projection distance and angle will cause errors in the matching of GPS points and links, such as the phenomenon of bypass or parallel path matching error. The generated travel time and congestion status are not in line with the actual situation. In order to more clearly illustrate the solution of the embodiment of the present invention, the matching effect of the projection distance and the angle on the GPS point and the link is first introduced. Referring to FIG. 2, a schematic diagram of a location point matching method according to an embodiment of the present invention is shown. Where Ρ represents the GPS point to be matched, and Ll and L2 represent the links near the GPS point. In the location point matching algorithm, the GPS points to be matched are projected to the links of all links in the vicinity, and the projection distance di (such as dl, d2) between the GPS points and the segments is calculated, and the angle θ ί (such as Θ 1) , Θ 2 ), where i denotes a sequence number. When a matching result is produced, the matched road segment is considered to be traveling on the road, and the projection point Pi (such as PI, P2) is used as the matching point of the vehicle on the road segment, that is, the current position of the vehicle on the matching road. Select all the links whose projection distance and angle are smaller than the threshold and calculate the distance metric λ ί of each candidate link according to the following formula:

λ ϊ = w d * di + ω θ * Θ i

Where oo d, ω θ are the weights of the projection distance and the weights of the included angles, respectively, and satisfy oo d+ ω θ

=1.

It can be seen from the above that the projection distance and the angle are very sensitive to the matching relationship between the GPS point and the link. The technical solution provided by the embodiment of the present invention, when performing the matching between the GPS point and the link, localizes the parameters used in the matching, that is, for each area, first selects multiple sets of different parameters, and then combines the area. The specific conditions determine the best parameters for the region, and finally use the best parameters to calculate the traffic information of the region. The technical solution provided by the embodiment of the invention significantly improves the accuracy of the obtained traffic information by using different parameters suitable for the region for different regions. After actual verification, the traffic information obtained by this program is relatively accurate and the effect is very satisfactory. The method for improving the accuracy of traffic information provided by the second embodiment of the present invention will be described in detail below.

In order to facilitate the clear description of the technical solutions of the embodiments of the present invention, in the embodiments of the present invention, the words "first" and "second" are used to distinguish the same or similar items whose functions and functions are basically the same. Those skilled in the art will understand that the words "first", "second", etc. do not limit the quantity and order of execution.

S1: Select the link to be tested.

Select a number of links in the area to be tested as the link to be tested to determine the best parameters of the area. When the area to be tested (such as any city) includes at least two levels of links, in the area to be tested, each level of the link is selected according to a predetermined ratio, and the FCD data of the selected link constitutes the to-be-tested Measure the FCD data of the area.

Exemplarily, the link may be divided into six levels, such as dividing into a first level, a second level, a third level, a fourth level, a fifth level, and a sixth level, or, specifically, a high speed, city. There are six grades of high-speed, national highway, provincial highway, county road and township and village road. Among them, high-speed, urban expressway and national highway and other good road links can also be called high-grade links, county roads and townships and villages. A poor link can also be referred to as a low level link.

In order to correctly reflect the road conditions in each area, in each area to be tested, each level of the link is selected according to a predetermined ratio, for example, the link is selected in a high-speed link according to a ratio of 20%, according to 20% The ratio selects the link in the high-speed link of the city, selects the link in the link of the national road according to the ratio of 10%, selects the link in the link of the provincial road according to the ratio of 5%, according to the ratio of 5% in the county The link is selected in the link of the track, and the link is selected in the link of the township village road according to the ratio of 2%. The FCD data of the above-mentioned selected link constitutes the FCD data of the above-mentioned area to be tested.

S2: Determine the optimal projection distance and angle.

Determine the optimal parameters for each zone, including at least the projection distance and the included angle. Since the projection distance and the angle are most sensitive to the GPS point-to-link matching, the embodiment of the present invention mainly takes the example of obtaining an optimal projection distance and an optimum angle as an example.

S21: For each FCD data of the area to be tested, select at least two sets of parameters to calculate initial values of the communication information.

In the embodiment of the present invention, the projection distance is selected in a range of a range of 40 meters to 100 meters, and the angle is selected in a range of 30 degrees to 65 degrees, and different sets of parameters are formed by different projection distances and angles. For example, in a set of parameters, the projection distance is 40 meters and the angle is 30 degrees. In another set of parameters, the projection distance is 50 meters and the angle is 40 degrees. In another set of parameters, the projection distance is 60 meters and the angle is 40. degree.

Each group of parameters is used to calculate the traffic information of the area, such as travel time and congestion status, to obtain the initial value of the traffic information of the area. S22: analyzing an initial value of the traffic information, and adjusting the parameter according to the analysis result to obtain an optimal parameter of the FCD data of the area to be tested.

In the embodiment of the present invention, the initial value of the traffic information is analyzed by using a reference value of the traffic information, and at least one of the projection distance and the included angle is adjusted according to the analysis result to obtain the best FCD data of the to-be-tested area. parameter. Here, the analysis results mainly analyze the travel time and congestion status.

When the FCD system performs data processing, the time interval between two adjacent GPS points that can be processed is usually about 30 seconds or even longer, and the number of GPS points that can be matched on the link is small. Therefore, the parameters are abnormally sensitive to GPS point-to-link matching. When using high-frequency GPS equipment, high-frequency GPS equipment can achieve one GPS point per second while performing data processing. By fitting the trajectory of the link through high-frequency points, more accurate traffic information can be obtained, so the above traffic information The reference value can be obtained by high-frequency GPS equipment. However, the high-frequency GPS equipment is more complicated in construction and higher in cost. Direct use of high-frequency GPS equipment on the floating car of the FCD system will cause a large economic burden. In practice, the feasibility is not great.

In the embodiment of the present invention, the traffic information obtained by the high-frequency GPS device is used as the reference value of the traffic information, and the initial value of the traffic information obtained by the selected parameter is analyzed based on the reference value of the traffic information, and the parameters are continuously adjusted. , get the best parameters, including the following:

The link with a travel time accuracy less than a predetermined ratio (eg 70%) is processed first.

The initial value of the traffic information of each link calculated by the selected parameter includes the travel time of each link, and the reference value of the traffic information includes the reference value of the travel time, the initial value of the travel time and the travel time. The reference value obtains the travel time accuracy rate corresponding to the link, such as the ratio of the initial value of the travel time and the reference value of the travel time as the accuracy of the travel time.

For a link with a travel time accuracy of less than 70%, it is determined whether the link travel time accuracy is lower due to a GPS point-to-link matching error, that is, whether it is caused by an inappropriate projection distance and/or an angle As a result, when the GPS point-to-link matching error of the link is confirmed, the projection distance and/or the angle are adjusted.

For example, when calculating the initial value of traffic information, a set of parameters selected is a projection distance of 40 meters. When the angle is 30 degrees, adjust the parameter to a projection distance of 42 meters and an angle of 32 degrees, and then update the initial value of the traffic information with the adjusted parameters. It can be understood that when adjusting the parameters, the projection distance and the angle can be adjusted at the same time, or only one of the projection distance or the angle can be adjusted.

Repeat the above steps for the updated initial value, that is, determine that the travel time accuracy rate of the link is less than the predetermined ratio and confirm that the GPS point-to-link matching error occurs, and adjust the used projection distance and/or clip again. angle. The initial value of the traffic information is updated again using the parameters adjusted again, and the traffic information after the update is analyzed.

When parameter adjustment is performed, since each area contains multiple links, the influence of different parameters on different links in one area may also be inconsistent. For example, when the parameters are adjusted, the travel time accuracy of some links is significantly improved. The travel time accuracy of some links does not change much, and the travel time accuracy of other links may be slightly reduced. In this case, the following strategies are adopted in the embodiment of the present invention:

When the level of the first link is lower than the level of the second link, the parameter is preferentially adjusted by using the analysis result of the initial value of the traffic information of the first link, that is, the parameter is preferentially considered for the link of the low level. The impact of traffic information. This is because, because the road state of the high-level link is better, in comparison, the influence of the parameter on the travel time accuracy of the high-level link is less than the influence of the parameter on the travel time accuracy of the low-level link, for example, When the first set of parameters is selected, the travel time accuracy of the high-grade link is 80%, and the travel time accuracy of the low-level link is 40%; when the second set of parameters is used, the travel time of the high-grade link The accuracy rate is still 80%, while the travel time accuracy of low-level links may increase to 75%.

Therefore, when performing the parameter adjustment process in the embodiment of the present invention, the analysis result of the traffic information of the low-level link is mainly considered under the premise of the analysis result of the traffic information of the high-level link, such as the parameter pair low-level link. The impact of travel time accuracy.

Through the above-mentioned initial selection of multiple sets of parameters, and the adjustment process for each set of parameters, several sets of parameters (including the initially selected sets of parameters and new parameters obtained during the adjustment process) and their corresponding traffic information are obtained, and these are compared. The travel time accuracy rate of all links in the area corresponding to the parameters determines the optimal parameters of the area. Travel time in the area as calculated by the first set of parameters A link with an accuracy greater than a predetermined ratio (eg, 70%) accounts for 65% of all links, and a link with a travel time accuracy greater than a predetermined ratio calculated by the second set of parameters accounts for 75% of all links. Then, the second group of parameters is a parameter superior to the first group of parameters, and so on, to determine the best parameters in the region.

S3: Calculate traffic information of the area to be tested by using the optimal parameter.

Since the optimal parameters suitable for the region have been calculated, the accuracy of the traffic information calculated using the optimal parameters is bound to be greatly improved.

Further, the technical solution of the embodiment of the present invention further includes: when the length of the link is smaller than the waiting radius of the link of the link, adjusting the waiting radius of the traffic light of the link according to the length of the link, so as to utilize the adjusted The traffic light waits for the radius to calculate the traffic information of the area to be tested.

This type of processing is because the existing FCD system uses the same value (such as 100 meters) for the traffic waiting radius of all links, and the length of each link is different, and some links are shorter in length, such as Less than 100 meters. Obviously, it is not appropriate to uniformly subtract the same traffic light waiting radius for all links when statistical traffic information, which affects the accuracy of traffic information.

When calculating the traffic information, the embodiment of the present invention first analyzes whether the setting of the waiting radius of the traffic light of each link is reasonable. When the length of the link is less than the waiting radius of the traffic light, it is determined that the setting of the waiting radius of the traffic light of the link is unreasonable, according to The length of the link adjusts the waiting radius of the traffic light of the link, and the adjusted traffic light waiting radius can be set according to the empirical value, and the adjusted traffic light waiting radius can also be set according to a predetermined ratio (such as 1/3, 1/5), such as When the length of the link is 80 meters, the adjusted traffic light waiting radius is set to 80* (1/5) = 16 meters.

Further, the technical solution of the embodiment of the present invention further includes: adjusting traffic information of the link in the intersection according to the traffic information of the link connected to the link in the intersection, for example, referring to the link in the intersection The congestion status of the connected link adjusts the congestion status of the link within the intersection.

The link in the intersection refers to the link where both the start point and the end point of the link are integration points. The link length in the intersection is very short, and the floating car travels on the link at most one traffic light. The travel time corresponding to the link is also very short (for example, 2 seconds). Therefore, there is usually no congestion in the link according to the general logical intersection. Therefore, after calculating the traffic information of each link, the link within the intersection is The road's unreasonable traffic information is adjusted to further improve the accuracy of traffic information. For example, when the traffic information of the link connected to the link in the intersection indicates that the traffic is clear, and the traffic information of the link in the intersection indicates the congestion, the link speed in the intersection is modified according to the current vehicle speed of the link in the intersection. A threshold value to modify the traffic information of the link within the intersection to indicate that the traffic is clear or slow.

The technical solution provided by the embodiment of the present invention, when performing the matching between the GPS point and the link, localizes the parameters used in the matching, that is, for each area, first selects multiple sets of different parameters, and then combines the area. The specific conditions determine the best parameters for the region, and finally use the best parameters of the region to calculate the traffic information of the region. The technical solution provided by the embodiment of the invention significantly improves the accuracy of the obtained traffic information by using different parameters suitable for the region for different regions. After actual verification, the traffic information obtained by this program is relatively accurate and the effect is very satisfactory.

In order to verify the effectiveness of the technical solution, the historical FCD data of each city is tested by using the optimal parameters obtained above, and the test results show that the travel time accuracy rate and the congestion state accuracy rate obtained by the technical solution are better than the existing solutions. With significant improvements, it is basically comparable to the results obtained with high-frequency GPS equipment, but the cost of this technical solution is much lower than the high cost required to use high-frequency GPS equipment.

Embodiment 3 of the present invention further provides an apparatus for improving the accuracy of traffic information. Referring to FIG. 3, the apparatus includes:

The parameter selection unit 31 is configured to calculate the initial value of the traffic information by selecting at least two sets of parameters for the floating car data FCD data of each area to be tested;

The optimal parameter obtaining unit 32 is configured to analyze an initial value of the traffic information, and adjust the parameter according to the analysis result to obtain an optimal parameter of the FCD data of the area to be tested;

The traffic information calculation unit 33 is configured to calculate traffic information of the area to be tested by using the optimal parameter.

Further, referring to FIG. 4, the apparatus further includes a link selecting unit 34, configured to: when the area to be tested includes at least two levels of links, select each of the areas to be tested according to a predetermined ratio. The level of the link, the FCD data of the selected link constitutes the FCD data of the area to be tested.

The optimal parameter obtaining unit 32 is specifically configured to: when the parameter includes at least a GPS point to link When the projection distance and the angle between the traveling direction of the vehicle and the link are used, the initial value of the traffic information is analyzed by using the reference value of the traffic information, and the projection distance and/or the angle is adjusted according to the analysis result to obtain the area to be tested. The best parameters for FCD data.

The optimal parameter obtaining unit 32 includes a parameter adjusting module and a comparison determining module, wherein the parameter adjusting module is configured to confirm that a GPS point-to-link matching occurs when a travel time accuracy rate corresponding to the link is less than a predetermined ratio In the case of an error, the projection distance and/or the angle is adjusted, wherein the traffic information includes at least a travel time corresponding to the link, and the initial value of the travel time and the reference value of the travel time are obtained by the link. Travel time accuracy rate; and updating the initial value of the traffic information according to the adjusted projection distance and/or the angle, using the reference value of the traffic information to analyze the initial value of the updated traffic information, and adjusting again according to the analysis result The projection distance and/or angle;

The comparison determining module is configured to compare travel time accuracy rates of all links corresponding to each set of parameters obtained in the adjustment operation, and determine the optimal parameters.

Further, the device further includes a traffic light waiting radius adjusting unit 35, configured to adjust a traffic light waiting radius of the link according to a length of the link when a length of the link is smaller than a traffic waiting radius of the link; The traffic information calculation unit 33 is further configured to calculate traffic information of the area to be tested by using the adjusted traffic light waiting radius.

Further, the device further includes a traffic information adjusting unit 36, configured to adjust traffic information of the link in the intersection according to traffic information of the link connected to the link in the intersection.

For a specific working mode of each functional module and unit in the device embodiment of the present invention, refer to the method embodiment of the present invention. The functional modules and units in the device embodiment of the present invention may be implemented separately or integrated in one or more units.

The technical solution provided by the embodiment of the present invention, when performing the matching between the GPS point and the link, localizes the parameters used in the matching, that is, for each area, first selects multiple sets of different parameters, and then combines the area. The specific conditions determine the best parameters for the region, and finally use the best parameters of the region to calculate the traffic information of the region. The technical solution provided by the embodiment of the present invention significantly improves the obtained traffic information by using different parameters suitable for the region in different regions. Accuracy. After actual verification, the traffic information obtained by this program is relatively accurate and the effect is very satisfactory. The fourth embodiment of the present invention further provides a floating car data processing device, which includes the device for improving the accuracy of traffic information as described in Embodiment 3 of the present invention.

It will be apparent to those skilled in the art that the present invention can be implemented by means of software plus the necessary general purpose hardware platform. Based on such understanding, the technical solution of the present invention, which is essential or contributes to the prior art, may be embodied in the form of a software product, which may be stored in a storage medium such as a ROM/RAM, a disk, An optical disk or the like includes instructions for causing a computer device (which may be a personal computer, server, or network device, etc.) to perform the methods described in various embodiments of the present invention or portions of the embodiments.

The above is only the specific embodiment of the present invention, but the scope of the present invention is not limited thereto, and any change or replacement that can be easily conceived by those skilled in the art within the technical scope of the present invention is All should be covered by the scope of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

Claim

A method for improving the accuracy of traffic information, the method comprising: calculating, for each floating area data FCD data of each area to be tested, at least two sets of parameters to calculate initial values of traffic information;

The method according to claim 1, wherein before the calculating the initial value of the traffic information by selecting at least two sets of parameters for the floating car data FCD data of each area to be tested, the method further includes: :

When the area to be tested includes at least two levels of links, in the area to be tested, each level of the link is selected according to a predetermined ratio, and the FCD data of the selected link constitutes the area to be tested. FCD data.

The method according to claim 1 or 2, wherein the parameter includes at least a projection distance of a global positioning system GPS point-to-link and an angle between a vehicle traveling direction and a link,

The analyzing the initial value of the traffic information, and adjusting the parameter according to the analysis result, and obtaining the optimal parameters of the FCD data of the area to be tested includes:

The initial value of the traffic information is analyzed by using a reference value of the traffic information, and the projection distance and/or the angle is adjusted according to the analysis result to obtain an optimal parameter of the FCD data of the area to be tested.

The method according to claim 3, wherein the initial value of the traffic information is analyzed by using a reference value of the traffic information, and the projection distance and/or the angle is adjusted according to the analysis result, to obtain the waiting The best parameters for measuring area FCD data include:

Adjusting the projection distance and/or the angle when the travel time accuracy corresponding to the link is less than a predetermined ratio and confirming that a GPS point-to-link matching error occurs, wherein the traffic information includes at least a link corresponding to the link Travel time, the travel time accuracy rate corresponding to the link is obtained from the initial value of the travel time and the reference value of the travel time;

Update the initial value of the traffic information according to the adjusted projection distance and/or angle to utilize the traffic information The reference value is used to analyze the updated initial value of the traffic information, and the projection distance and/or the angle is adjusted again according to the analysis result;

The travel time accuracy of all links corresponding to each set of parameters obtained in the adjustment operation is compared, and the optimal parameters are determined.

The method according to claim 2, wherein the analyzing the initial value of the traffic information, and adjusting the parameter according to the analysis result, obtaining the optimal parameters of the FCD data of the area to be tested includes:

When the level of the first link is lower than the level of the second link, the parameter is preferentially adjusted using the analysis result of the initial value of the traffic of the first link.

The method according to claim 1 or 2, wherein the parameter further comprises a traffic light waiting radius of the link, before calculating the traffic information of the area to be tested by using the optimal parameter, The method also includes:

When the length of the link is smaller than the waiting radius of the link, the traffic light waiting radius of the link is adjusted according to the length of the link, and the traffic information of the area to be tested is calculated by using the adjusted traffic light waiting radius .

The method according to claim 1 or 2, wherein after the calculating the traffic information of the area to be tested by using the optimal parameter, the method further comprises:

The traffic information of the link within the intersection is adjusted based on the traffic information of the link connected to the link within the intersection.

A device for improving the accuracy of traffic information, characterized in that: the device comprises: a parameter selection unit, configured to calculate the traffic information by using at least two sets of parameters for the FCD data of the floating car data of each area to be tested. Initial value

And a traffic information calculation unit, configured to calculate traffic information of the area to be tested by using the optimal parameter.

9. The apparatus according to claim 8, wherein the apparatus further comprises a link selection unit, The link selecting unit is configured to: when the area to be tested includes at least two levels of links, select, in the area to be tested, a link of each level according to a predetermined ratio, and the selected link The FCD data constitutes the FCD data of the area to be tested.

The device according to claim 8, wherein the optimal parameter obtaining unit is specifically configured to: when the parameter includes at least a global positioning system GPS point-to-link projection distance and a vehicle traveling direction and link The angle of the traffic information is used to analyze the initial value of the traffic information, and the projection distance and/or the angle is adjusted according to the analysis result to obtain an optimal parameter of the FCD data of the area to be tested.

The device according to claim 10, wherein the optimal parameter obtaining unit comprises a parameter adjusting module and a comparison determining module,

The parameter adjustment module is configured to adjust the projection distance and/or the angle when the travel time accuracy rate corresponding to the link is less than a predetermined ratio and confirm that a GPS point-to-link matching error occurs, wherein the traffic The information includes at least a travel time corresponding to the link, and the travel time accuracy rate corresponding to the link is obtained from the initial value of the travel time and the reference value of the travel time; and the traffic is updated according to the adjusted projection distance and/or the angle An initial value of the information, the initial value of the updated traffic information is analyzed by using a reference value of the traffic information, and the projection distance and/or the angle is adjusted again according to the analysis result; the comparison determining module is configured to compare The travel time accuracy rate of all links corresponding to each set of parameters obtained in the operation is adjusted, and the optimal parameters are determined.

12. The device according to claim 8, wherein the device further comprises a traffic light waiting radius adjustment unit,

The traffic light waiting radius adjusting unit is configured to adjust a traffic light waiting radius of the link according to a length of the link when a length of the link is smaller than a traffic waiting radius of the link;

The traffic information calculation unit is further configured to calculate traffic information of the to-be-measured area by using the adjusted traffic light waiting radius.

The device according to claim 8, wherein the device further comprises a traffic information adjusting unit, configured to adjust the inner chain of the intersection according to traffic information of a link connected to the link in the intersection Road traffic information.

A floating car data processing device, characterized in that the device comprises the device for improving the accuracy of traffic information according to any one of the preceding claims 8 to 13.