Urban district traffic assessment method and system based on online map and GIS

Abstract

The invention provides an urban district traffic assessment method and system based on an online map and a GIS, and the method comprises the steps: obtaining traffic state data through the online map, carrying out the traffic congestion assessment, calculating a traffic state sharing rate and a road network traffic condition comprehensive index, determining the fixed length of a broken road section according to the district area, and carrying out the traffic congestion assessment. According to the method, the function of effectively evaluating the urban district traffic system is achieved, compared with an existing method, the method has the advantages of being simple, efficient, low in cost and high in accuracy, the road network drawing efficiency is greatly improved, and a basis is provided for analyzing district traffic problems and formulating district traffic improvement schemes. According to the method, data statistics, calculation and visual display are carried out through GIS software, and the problems that the length of a road section is not easy to measure, and data statistics is complicated and difficult to display are solved.

Description

Technical Field

[0001] The present invention belongs to the technical field of traffic system evaluation, and in particular relates to a method and system for evaluating vehicle traffic in urban areas based on online maps and GIS. Background Art

[0002] With the continuous growth of urban vehicles, traffic congestion is becoming more and more serious, which seriously affects people's quality of life. Therefore, it is urgent to alleviate traffic congestion, and traffic system evaluation is the basis and prerequisite for solving traffic congestion. At present, the data sources of traffic system evaluation are mainly manual traffic surveys, fixed equipment (detectors, induction coils, cameras, etc.) or mobile equipment (mobile phones, floating cars, etc.), but the above methods have problems such as inaccurate data, high cost and low efficiency. Therefore, it is necessary to propose an accurate, efficient and convenient traffic system evaluation method. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide an urban area vehicle traffic assessment method and system based on online maps and GIS, which are used to assess the vehicle traffic conditions in urban areas.

[0004] The technical solution adopted by the present invention to solve the above technical problems is: a method for evaluating urban area vehicle traffic based on online maps and GIS, comprising the following steps: S1: Determine the area to be evaluated on the city map; S2: Obtain the real-time traffic status data of each section of the road network in the area to be evaluated during the daily peak period based on the online city map; S3: Draw the area traffic status road network based on the real-time traffic status data, and interrupt each road section according to the traffic status; S4: pre-processing the area traffic status road network after dividing the road sections; S5: Add attribute fields to the pre-processed area traffic status road network; S6: Calculate the traffic status share of each level every day; S7: Calculate the comprehensive traffic status sharing rate of the road network; S8: Calculate the comprehensive index of road network traffic conditions and evaluate the road network service level; S9: Calculate the average traffic status of each road section and locate traffic problems.

[0005] According to the above scheme, in step S2, the specific steps are: Traffic condition maps of each road section during the same peak period for at least five consecutive working days are intercepted from the online map of the road network in the area to be evaluated.

[0006] According to the above scheme, in step S3, the specific steps are: The interruption length of the road section is determined according to the area of ​​the area to be evaluated; the area of ​​the area is divided into levels from small to large according to an arithmetic progression, and the interruption length value increases by a fixed length for each increase in the area of ​​the area; if the section length between adjacent intersections is less than the interruption length, the section will not be interrupted.

[0007] According to the above scheme, in step S4, the specific steps are: Calculate the length of each traffic status level for the area traffic status road network after dividing the road sections, and input the number of lanes and road grade of each section.

[0008] According to the above scheme, in step S5, the specific steps are: Copy multiple pre-processed area traffic status road networks so that the number of road networks is consistent with the number of days of traffic status data obtained in step S2; Create a "traffic status" field in the attribute table of the road network; input the traffic status data obtained in step S2 into the attribute table of the road network respectively, and assign values ​​to the "traffic status" field; the traffic status includes smooth, slow, congested and severely congested.

[0009] According to the above scheme, in step S6, the daily traffic status share of each level is calculated based on the ratio of the sum of the length of the road section multiplied by the number of lanes under a certain traffic state to the sum of the length of the road section multiplied by the number of lanes in the area road network.

[0010] According to the above scheme, in step S7, the daily traffic status share rate of each level is averaged according to the number of working days to obtain the comprehensive traffic status share rate of the road network.

[0011] According to the above scheme, in step S8, the specific steps are: The comprehensive index of road network traffic status is obtained by weighted summing up the road network comprehensive traffic status share rate according to different traffic conditions; Divide the range of the comprehensive index of road network traffic conditions, and evaluate the service level of road network traffic according to the range of the calculated comprehensive index.

[0012] According to the above scheme, in step S9, the specific steps are: The traffic status value of a certain road section on a certain working day is averaged according to the number of working days to obtain the average traffic status of each road section; Divide the range of traffic status values, find congested nodes and locate traffic problems according to the traffic status level within the range of the average traffic status of each road section.

[0013] Urban area traffic assessment system based on online maps and GIS, The area scope submodule is used to determine the area scope to be evaluated on the city map; The real-time data submodule is used to obtain the real-time traffic status data of each section of the road network in the area to be evaluated during the daily peak period based on the online city map; The road segmentation submodule is used to draw the area traffic status road network based on the real-time traffic status data and interrupt each road segment according to the traffic status; The preprocessing submodule is used to preprocess the traffic status road network of the area after dividing the road sections; The road network attribute submodule is used to add attribute fields to the pre-processed area traffic status road network; The daily share rate submodule is used to calculate the daily share rate of each level of traffic status; The comprehensive sharing rate submodule is used to calculate the comprehensive traffic status sharing rate of the road network; The comprehensive index submodule is used to calculate the comprehensive index of road network traffic conditions and evaluate the road network service level; The average state submodule is used to calculate the average traffic state of each road section and locate traffic problems.

[0014] The beneficial effects of the present invention are: 1. The urban area vehicle traffic assessment method and system based on online maps and GIS of the present invention obtains traffic status data through online maps to perform traffic congestion assessment, calculates the traffic status share rate and the comprehensive index of road network traffic conditions, and determines the fixed length of the interrupted road section according to the area of ​​the area, thereby realizing the function of effectively evaluating the urban area vehicle traffic system. Compared with the existing methods, it has the advantages of simplicity, high efficiency, low cost and high accuracy, and greatly improves the efficiency of road network drawing, providing a basis for analyzing area traffic problems and formulating area traffic improvement plans.

[0015] 2. The present invention uses GIS software to perform statistics, calculation and visual display of data, which solves the problems of difficult measurement of road section length, complicated data statistics and difficulty in display.

[0016] Of course, any product implementing the present invention does not necessarily need to achieve all of the advantages described above at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 is a flow chart of an embodiment of the present invention.

[0019] Figure 2This is a diagram showing the calculation results of the traffic state sharing rate divided by fixed length according to an embodiment of the present invention.

[0020] Figure 3 This is a diagram showing the calculation result of the traffic state sharing rate divided by actual length according to an embodiment of the present invention.

[0021] Figure 4 This is an embodiment of the present invention that imports the traffic status road network CAD into the GIS software map.

[0022] Figure 5 It is a diagram of a GIS road network attribute table according to an embodiment of the present invention.

[0023] Figure 6 4 is a five-day traffic status share diagram of each level according to an embodiment of the present invention. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0025] Example 1 See also Figure 1 The specific steps of the urban area traffic assessment method based on online maps and GIS are as follows: S1: Determine the area to be evaluated on the city map; S2: Obtain the real-time traffic status data of each section of the road network in the area to be evaluated during the daily peak period based on the online city map; S3: Draw the area traffic status road network based on the real-time traffic status data, and interrupt each road section according to the traffic status; S4: pre-processing the area traffic status road network after dividing the road sections; S5: Add attribute fields to the pre-processed area traffic status road network; S6: Calculate the traffic status share of each level every day; S7: Calculate the comprehensive traffic status sharing rate of the road network; S8: Calculate the comprehensive index of road network traffic conditions and evaluate the road network service level; S9: Calculate the average traffic status of each road section and locate traffic problems.

[0026] Furthermore, in step S2, the specific steps are: Traffic condition maps of each road section during the same peak period for at least five consecutive working days are intercepted from the online map of the road network in the area to be evaluated.

[0027] In step S3, the specific steps are: The interruption length of the road section is determined according to the area of ​​the area to be evaluated; the area of ​​the area is divided into levels from small to large according to an arithmetic progression, and the interruption length value increases by a fixed length for each increase in the area of ​​the area; if the section length between adjacent intersections is less than the interruption length, the section will not be interrupted.

[0028] In step S4, the specific steps are: Calculate the length of each traffic status level for the area traffic status road network after dividing the road sections, and input the number of lanes and road grade of each section.

[0029] In step S5, the specific steps are: Copy multiple pre-processed area traffic status road networks so that the number of road networks is consistent with the number of days of traffic status data obtained in step S2; Create a "traffic status" field in the attribute table of the road network; input the traffic status data obtained in step S2 into the attribute table of the road network respectively, and assign values ​​to the "traffic status" field; the traffic status includes smooth, slow, congested and severely congested.

[0030] In step S6, the daily traffic status share of each level is calculated based on the ratio of the sum of the length of the road section multiplied by the number of lanes under a certain traffic state to the sum of the length of the road section multiplied by the number of lanes in the area road network.

[0031] In step S7, the daily traffic status share rate of each level is averaged according to the number of working days to obtain the comprehensive traffic status share rate of the road network.

[0032] In step S8, the specific steps are: The comprehensive index of road network traffic status is obtained by weighted summing up the road network comprehensive traffic status share rate according to different traffic conditions; Divide the range of the comprehensive index of road network traffic conditions, and evaluate the service level of road network traffic according to the range of the calculated comprehensive index.

[0033] In step S9, the specific steps are: The traffic status value of a certain road section on a certain working day is averaged according to the number of working days to obtain the average traffic status of each road section; Divide the range of traffic status values, find congested nodes and locate traffic problems according to the traffic status level within the range of the average traffic status of each road section.

[0034] This embodiment obtains traffic status data through online maps to evaluate traffic congestion, calculates the traffic status share rate and the comprehensive index of road network traffic conditions, and determines the fixed length of the interrupted road section according to the area of ​​the area, thereby realizing the function of effectively evaluating the vehicle traffic system in the urban area. Compared with the existing method, it has the advantages of simplicity, high efficiency, low cost and high accuracy, and greatly improves the efficiency of road network drawing, providing a basis for analyzing area traffic problems and formulating area traffic improvement plans.

[0035] Example 2 The steps of this embodiment are the same as those of embodiment 1, except that each step is applied to a specific example of a certain area in a certain city. Specifically, the following steps are included: S1: Determine the scope of a certain area; The research scope is the area enclosed by LY Road, SH Line, MZ Avenue and GG Avenue.

[0036] S2: Obtain the traffic status data of a certain area road network; Open the real-time traffic conditions on the online map and capture the real-time traffic status map of a certain area's road network at 8:30 in the morning for five consecutive working days.

[0037] S3: Use CAD to draw the traffic status road network of Guanshan area; The area of ​​a certain area is about 12km 2 ,According to Table 1, the interruption length is taken as 500m, so the road network is divided according to the fixed length of 500m. ,If the length of a section between adjacent intersections is less than the interruption length, the ,section will not be interrupted.

[0038] Table 1 Road network division length value table <![CDATA[Area of the area (km 2 )]]> 0～2 2-4 4-6 6-8 Greater than 8 Breaking length (m) 100 200 300 400 500 In order to verify the effectiveness of this method, the traffic state sharing rate calculation results based on the actual length of the traffic state and the fixed length are compared. Taking the first working day as an example, the traffic state road network divided by fixed length and actual length. The traffic state sharing rate calculation results based on fixed length are as follows: Figure 2 As shown in the figure, the calculation results of traffic state sharing rate divided by actual length are as follows Figure 3 As shown in the figure. The share of free-flowing state calculated by fixed length is 82.89%, the share of slow-moving state is 8.97%, the share of congested state is 8.03%, and the share of severe congestion is 0.11%; the share of free-flowing state calculated by actual length is 83.76%, the share of slow-moving state is 8.20%, the share of congested state is 7.97%, and the share of severe congestion is 0.08%. It can be seen that the calculation results of the two methods are very different, which verifies the effectiveness of dividing the road network by fixed length.

[0039] S4: Import the traffic status road network into GIS software, such as Figure 4 As shown; Import the traffic status road network CAD into the GIS software, use the calculation tool in the GIS road network attribute table to automatically calculate the length of each road section, and enter the number of lanes and road grade of each road section, such as Figure 5 shown.

[0040] S5: Input road network traffic status data into GIS software Copy the five GIS road networks obtained in step S4, create a "traffic status" field in the attribute table of each road network, and enter the five-day traffic status data obtained into the "traffic status" field of the attribute table of each GIS road network. The traffic status values ​​corresponding to each traffic status are shown in the following table: Table 2 Traffic status value table Traffic status Smooth amble Congestion Severe congestion Traffic status value 1 2 3 4 S6: Calculate the traffic status share of each level every day. The specific steps are as follows:

[0041]

[0042] In the formula, For the working days; For the Traffic status; The traffic status is The number of road sections; For the The number of lanes per road section; The i-th traffic state is The length of the road section; is the number of road sections in the regional road network; is the length of the kth road segment; is the number of lanes in the kth road section; For the The first working day The traffic state share.

[0043] Use GIS calculation tools to calculate the traffic status share of each level for five days, such as Figure 6 shown.

[0044] S7: Calculate the comprehensive traffic status share of the road network. The specific steps are as follows:

[0045] In the formula, For the working days; D is the number of working days; For the The first working day The share of traffic status; For the The comprehensive share of traffic conditions.

[0046] The calculation shows that the comprehensive share rate of the unobstructed state is 77.82%, the comprehensive share rate of the slow-moving state is 11.10%, the comprehensive share rate of the congested state is 7.71%, and the comprehensive share rate of the severe congestion is 3.37%.

[0047] S8: Calculate the comprehensive index of road network traffic conditions. The specific steps are as follows: The formula for calculating the comprehensive index of road network traffic conditions is:

[0048] According to the comprehensive index of road network traffic conditions, the road network traffic service level is evaluated, and the service level classification thresholds are as follows: Table 3 Service level classification thresholds Service Level Rating Level 1 Level 2 Level 3 Level 4 Comprehensive index range 1-1.2 1.2-1.5 1.5-2 2-4 If the service level is level one, the traffic organization of the area nodes will be optimized; if the service level is level two, the area roads will be renovated and expanded; if the service level is level three or level four, the area road network density will be increased.

[0049] The calculated comprehensive index of road network traffic conditions is 1.3663. The traffic service level of Guanshan area is level 2, and the roads in the area need to be rebuilt and expanded.

[0050] S9: Calculate the average traffic status of the road section. The specific steps are as follows: The calculation formula for the average traffic status of each road section is as follows:

[0051] In the formula, is the traffic status value of the i-th road section on the d-th weekday.

[0052] In GIS, the "traffic status" fields of multiple days are summarized into a road network attribute table, and the average traffic status of each road section is calculated using calculation tools. According to the average traffic status of each road section, congestion nodes are found and traffic problems are discovered. The thresholds for dividing the service level of the road section are as follows: Table 4 Traffic status level classification thresholds Traffic status level Level 1 Level 2 Level 3 Level 4 Traffic status value range 1-1.5 1.5-2.5 2.5-3.5 3.5-4 In GIS, the "traffic status" fields of multiple days are summarized into a road network attribute table, and the average traffic status of each road section is calculated using calculation tools. It is found that main roads and expressways such as GS Avenue, SH Line, GG Avenue, MZ Avenue, and XC Avenue are the main congested roads.

[0053] It should be understood that the size of the serial numbers of the steps in the above embodiments does not mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present application.

[0054] This embodiment uses GIS software to perform statistics, calculations and visual displays of data, thereby solving the problems of difficult measurement of road section lengths and complicated and difficult display of data statistics.

[0055] Example 3 This embodiment is used to implement the principle of the above method embodiment to construct an urban area vehicle traffic assessment system based on online maps and GIS, including an area range submodule, a real-time data submodule, a road section division submodule, a preprocessing submodule, a road network attribute submodule, a daily sharing rate submodule, a comprehensive sharing rate submodule, a comprehensive index submodule and an average state submodule; The area scope submodule is used to determine the area scope to be evaluated on the city map; The real-time data submodule is used to obtain the real-time traffic status data of each section of the road network in the area to be evaluated during the daily peak period based on the online city map; The road segmentation submodule is used to draw the area traffic status road network based on the real-time traffic status data and interrupt each road segment according to the traffic status; The preprocessing submodule is used to preprocess the traffic status road network of the area after dividing the road sections; The road network attribute submodule is used to add attribute fields to the pre-processed area traffic status road network; The daily share rate submodule is used to calculate the daily share rate of each level of traffic status; The comprehensive sharing rate submodule is used to calculate the comprehensive traffic status sharing rate of the road network; The comprehensive index submodule is used to calculate the comprehensive index of road network traffic conditions and evaluate the road network service level; The average state submodule is used to calculate the average traffic state of each road section and locate traffic problems.

[0056] Each sub-module is mainly used to implement each step of the method embodiment, which will not be described in detail here.

[0057] It should be pointed out that, according to the needs of implementation, the various steps / components described in this application can be split into more steps / components, and two or more steps / components or partial operations of steps / components can be combined into new steps / components to achieve the purpose of the present invention.

[0058] This embodiment also includes a processor, a communication interface, a memory and a communication bus; wherein the processor, the communication interface and the memory communicate with each other via the communication bus; a computer program is stored in the memory, and when the program is executed by the processor, the processor executes the steps of the urban area vehicle traffic assessment method based on online maps and GIS.

[0059] This embodiment also provides a computer-readable storage medium having executable instructions stored thereon. When the instructions are executed by a processor, the processor implements a method for evaluating vehicle traffic in an urban area based on online maps and GIS.

[0060] Those skilled in the art will appreciate that the embodiments of the present application may be provided as methods, systems, or computer program products. Therefore, the present application may take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware.

[0061] Moreover, the present application may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program codes.

[0062] The present application is described with reference to the block diagram of the device (system) according to Embodiment 1 of the present application and the flowchart of the method and computer program product of Embodiment 3. It should be understood that each process or box in the flowchart or block diagram, and the combination of the processes or boxes in the flowchart or block diagram can be implemented by computer program instructions.

[0063] These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the process Figure 1 A process or multiple processes or boxes Figure 1 An urban area vehicle traffic assessment system based on online maps and GIS that includes the functions specified in one or more boxes.

[0064] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes or boxes Figure 1 A function specified in one or more boxes.

[0065] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes or boxes Figure 1 The steps of the method for evaluating the vehicular traffic in an urban area based on online maps and GIS are specified in one or more boxes.

[0066] The above embodiments are only used to illustrate the design ideas and features of the present invention, and their purpose is to enable those skilled in the art to understand the content of the present invention and implement it accordingly. The protection scope of the present invention is not limited to the above embodiments. Therefore, any equivalent changes or modifications made based on the principles and design ideas disclosed by the present invention are within the protection scope of the present invention.

Claims

1. A method for evaluating vehicle traffic in urban areas based on online maps and GIS, characterized by: The following steps are involved: S1: Determine the area to be evaluated on the city map; S2: Obtain the real-time traffic status data of each section of the road network in the area to be evaluated during the daily peak period based on the online city map; S3: Draw the area traffic status road network based on the real-time traffic status data, and interrupt each road section according to the traffic status; S4: pre-processing the area traffic status road network after dividing the road sections; S5: Add attribute fields to the pre-processed area traffic status road network; S6: Calculate the traffic status share of each level every day; S7: Calculate the comprehensive traffic status sharing rate of the road network; S8: Calculate the comprehensive index of road network traffic conditions and evaluate the road network service level; S9: Calculate the average traffic status of each road section and locate traffic problems.

2. The method for evaluating urban area traffic based on online maps and GIS according to claim 1 is characterized by: In the step S2, the specific steps are: Traffic condition maps of each road section during the same peak period for at least five consecutive working days are intercepted from the online map of the road network in the area to be evaluated.

3. The method for evaluating urban area traffic based on online maps and GIS according to claim 1 is characterized by: In the step S3, the specific steps are: The interruption length of the road section is determined according to the area of ​​the area to be evaluated; the area of ​​the area is divided into levels from small to large according to an arithmetic progression, and the interruption length value increases by a fixed length for each increase in the area of ​​the area; if the section length between adjacent intersections is less than the interruption length, the section will not be interrupted.

4. The method for evaluating urban area traffic based on online maps and GIS according to claim 1 is characterized by: In the step S4, the specific steps are: Calculate the length of each traffic status level for the area traffic status road network after dividing the road sections, and input the number of lanes and road grade of each section.

5. The method for evaluating urban area traffic based on online maps and GIS according to claim 1 is characterized by: In the step S5, the specific steps are: Copy multiple pre-processed area traffic status road networks so that the number of road networks is consistent with the number of days of traffic status data obtained in step S2; Create a "traffic status" field in the attribute table of the road network; input the traffic status data obtained in step S2 into the attribute table of the road network respectively, and assign it to the "traffic status" field; the traffic status includes smooth, slow, congested and severely congested.

6. The method for evaluating urban area traffic based on online maps and GIS according to claim 1 is characterized by: In step S6, the daily traffic status share of each level is calculated based on the ratio of the sum of the length of the road section multiplied by the number of lanes under a certain traffic state to the sum of the length of the road section multiplied by the number of lanes in the area road network.

7. The method for evaluating urban area traffic based on online maps and GIS according to claim 1 is characterized by: In the step S7, the daily traffic status share of each level is averaged according to the number of working days to obtain the comprehensive traffic status share of the road network.

8. The method for evaluating urban area traffic based on online maps and GIS according to claim 1 is characterized by: In the step S8, the specific steps are: The comprehensive index of road network traffic status is obtained by weighted summing up the road network comprehensive traffic status share rate according to different traffic conditions; Divide the range of the comprehensive index of road network traffic conditions, and evaluate the service level of road network traffic according to the range of the calculated comprehensive index.

9. The method for evaluating urban area traffic based on online maps and GIS according to claim 1 is characterized by: In the step S9, the specific steps are: The traffic status value of a certain road section on a certain working day is averaged according to the number of working days to obtain the average traffic status of each road section; Divide the range of traffic status values, find congested nodes and locate traffic problems according to the traffic status level within the range of the average traffic status of each road section.

10. The urban area vehicle traffic assessment system based on online maps and GIS is characterized by: The area scope submodule is used to determine the area scope to be evaluated on the city map; The real-time data submodule is used to obtain the real-time traffic status data of each section of the road network in the area to be evaluated during the daily peak period based on the online city map; The road segmentation submodule is used to draw the area traffic status road network based on the real-time traffic status data and interrupt each road segment according to the traffic status; The preprocessing submodule is used to preprocess the traffic status road network of the area after dividing the road sections; The road network attribute submodule is used to add attribute fields to the pre-processed area traffic status road network; The daily share rate submodule is used to calculate the daily share rate of each level of traffic status; The comprehensive sharing rate submodule is used to calculate the comprehensive traffic status sharing rate of the road network; The comprehensive index submodule is used to calculate the comprehensive index of road network traffic conditions and evaluate the road network service level; The average state submodule is used to calculate the average traffic state of each road section and locate traffic problems.

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