CN104063830A - Method for exchanging traffic information - Google Patents
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- CN104063830A CN104063830A CN201310093842.1A CN201310093842A CN104063830A CN 104063830 A CN104063830 A CN 104063830A CN 201310093842 A CN201310093842 A CN 201310093842A CN 104063830 A CN104063830 A CN 104063830A
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Abstract
The invention discloses a method for exchanging traffic information, which belongs to the field of intelligent traffic. The method comprises the steps of: preprocessing and stacking an inter-city processing road network and a city processing road network for forming an integrated total road network; extracting city traffic information and inter-city traffic information, and exchanging city traffic information and inter-city traffic information in the total road network. According to the method of the invention, the inter-city traffic information is supplemented to the city traffic information, and simultaneously the city traffic information is supplemented to the inter-city traffic information, thereby improving coverage rate of the city traffic information and the inter-city traffic information. Simultaneously, because of interaction between the city traffic information and the inter-city traffic information, accuracy of an overlap area between the city road network and the inter-city road network can be improved.
Description
Technical field
The present invention relates to intelligent transportation field, particularly a kind of switching method of transport information.
Background technology
At intelligent transportation field, real-time dynamic information service can provide efficient feasible traffic guidance and trip planning information for Public Traveling, communications and transportation etc., saves time, reduces costs and the object such as low-carbon environment-friendly thereby reach.At present, in city, traffic-information service can be traffic control department provides the foundation of traffic control and management, for the roading department road equipment of making rational planning for provides reference frame, reach the object of alleviating traffic congestion, energy-saving and emission-reduction, and day by day deeply and affect people's trip life.
Floating Car (Floating Car Data) technology is one of technological means of obtaining in intelligent transportation system Traffic Information.It utilizes location technology, wireless communication technology and the information processing technology, the collection of the traffic parameters such as GPS positional information, instantaneous travel speed and the direction of realization to driving vehicle on road, in conjunction with Road network data, the traffic parameter gathering is carried out to the calculating such as map match, path culculating and traffic information fusion, form the transport information of reflection Real-time Road jam situation, for vehicle supervision department and the public provide dynamic traffic control and induced service.
At present, the city Real-time Traffic Information based on Floating Car and the intercity Real-time Traffic Informations based on two visitor's one danger have been served crowd, and provide Real-time Traffic Information for traffic control department and the public.Because Floating Car has limited amount and the irregularities of travelling, make within the same cycle, a lot of roads do not have Floating Car to cover, and can not calculate the congestion information of road, thereby have reduced integrality and the availability of transport information.Therefore, city Real-time Traffic Information and intercity Real-time Traffic Information have the incomplete problem of transport information.If urban traffic information and Intercity Transportation information can be supplemented mutually, the transport information coverage rate of road will certainly increase.But because the ride characteristic of taxi and two visitor's one danger cars is inconsistent, and the road road network mating is separately inconsistent, makes urban traffic information and Intercity Transportation information be difficult to merge.
The mode at present transport information based on different road networks being exchanged is to adopt the mode of matching list to carry out, and location matches is carried out in the section of different maps, obtains the position relationship of different maps Road section, thereby realizes the conversion between different road networks.Realize the mutual conversion between the map of different editions or different vendor based on matching list, complicated operation, is easy to make mistakes, and produces and safeguard that the workload of matching list is large.
Summary of the invention
In view of this, the object of the present invention is to provide a kind of switching method of transport information, for improving the efficiency of Intercity Transportation information and urban traffic information exchange.
The switching method that the invention provides a kind of transport information, comprising:
Intercity processing road network and city processing road network are carried out to pre-service and be superimposed, form the total road network after integrating; Extract urban traffic information and Intercity Transportation information, in described total road network, carry out the exchange of urban traffic information and Intercity Transportation information.
The present invention proposes a kind of new method and solves city road network and the inconsistent problem of intercity road network, main thought is that intercity processing road network and city processing road network are integrated, the intercity road network that goes to replace this region with city processing road network, obtains portion and comprises intercity and total road network urban road.The processing road network of selecting phase Yingcheng City from total road network according to administrative division extracts corresponding road network as intercity processing road network according to the connectedness of category of roads and road network from total road network.The method adds to Intercity Transportation information in urban traffic information, also urban traffic information is added in Intercity Transportation information simultaneously, has increased the coverage rate of urban traffic information and Intercity Transportation information; Meanwhile, there is the interaction between urban traffic information and Intercity Transportation information, can increase the accuracy rate of city and intercity road network overlay region.
Brief description of the drawings
Fig. 1 is the storage organization schematic diagram of Intercity Transportation information in the embodiment of the present invention;
Fig. 2 generates the urban traffic information of fusion and the principle schematic of Intercity Transportation information in the embodiment of the present invention;
The switching method process flow diagram of the transport information that Fig. 3 provides for the embodiment of the present invention;
Fig. 4 is the total road network schematic diagram after integrating in the embodiment of the present invention;
The transport information switching method process flow diagram as an example of three cities example that Fig. 5 provides for the embodiment of the present invention.
Embodiment
For making the object, technical solutions and advantages of the present invention clearer, below in conjunction with accompanying drawing, the present invention is described in further detail.
The embodiment of the present invention proposes a kind of new method and solves city road network and the inconsistent problem of intercity road network, and the method adopts map to integrate and no longer makes matching list, is simple and easy to use.The main thought of the method is that intercity processing road network and city processing road network are integrated, and removes to replace the intercity road network in this region with city processing road network, obtains portion and comprises intercity and total road network urban road.The processing road network of selecting phase Yingcheng City from total road network according to administrative division extracts corresponding road network as intercity processing road network according to the connectedness of category of roads and road network from total road network.
Because intercity road network scope is larger, generally comprise multiple cities, carry out the exchange of Intercity Transportation information and urban traffic information, generally can load the urban traffic information in all cities that Intercity Transportation information and intercity road network cover simultaneously, then carry out exchanges data, but because amount of traffic information is large, make exchange be difficult to carry out.The embodiment of the present invention can be carried out faster for the exchange that makes Intercity Transportation information and urban traffic information, and the storage organization of Intercity Transportation information has been done to the definition as Fig. 1.Wherein, Intercity Transportation structure information storage is mainly made up of file header, city index, transport information three parts.The information such as file header record version this shop, region, generation time, reference position and the side-play amount of each city storage transport information of city index record, transport information records the transport information in every section according to section.
As shown in Figure 2, urban traffic information and Intercity Transportation information, after transport information exchange, generate urban traffic information and Intercity Transportation information after merging.Wherein transport information exchange mainly comprises road network pre-service, urban traffic information extraction, Intercity Transportation information extraction, transport information exchange and transport information generation.
The switching method process flow diagram of the transport information that Fig. 3 provides for the embodiment of the present invention, comprises the following steps:
Step 301, carry out road network pre-service.Intercity processing road network and city processing road network are formatd according to unified standard, as following table
Table 1
Why intercity processing road network and city processing road network are carried out to pre-service, be because intercity processing road network and city process road network may be from different manufacturers or different map versions, thereby cause identical road in map separately, to explain inconsistent (physical location in road section ID or section).Therefore, below in step, the present embodiment adopts map integration method to integrate road network, removes intercity processing road network and city and processes same link in road network representing inconsistent problem in map separately.Before doing map integration, need the differently form of diagram data of specification, therefore defined table 1.
Step 302, road network is processed in city and intercity processing road network is superimposed, form the total road network after integrating.Total road network after integration is made up of the intercity road network of grey and the city road network of black, as shown in Figure 4.
In total road network after integration, the road network filtering out according to administrative division (CITYCODE) is processed road network as city, the road network filtering out according to the connectedness of category of roads (NR) and road is as intercity processing road network, and mark INTERCITY=1.Because intercity processing road network is sparse compared with city processing road network, therefore processing the transport information of road network, not every city all needs to exchange on intercity processing road network.Therefore, it is mainly in order to carry out transport information when exchange below that INTERCITY is labeled as 1, the transport information which road in road network is processed in city will exchange and set as the transport information in intercity processing road network, and non-intercity this field mark of processing road network is 0.
Step 303, extraction urban traffic information and Intercity Transportation information.Because real-time urban traffic information generating period is generally 5 minutes, and the real-time Intercity Transportation Information generation cycle is generally 15 minutes.Now define Floating Car sampling period T=5 minute, within one day 24 hours, be divided into 288 cycles, i.e. k=1,2 ..., 288(k is one day sampling period being divided for 24 hours), wherein k=1 represents 00:00～00:05; K=288 represents 23:55～00:00.Gucheng city is at t
cs=kT(k=1,2 ..., 288) and moment generation transport information, intercity at t
cj=k ' T(k '=nk, nk<=288) moment generation transport information.Wherein, t represents the time period, t
csthe rise time section of urban traffic information, every 5 minutes one section; t
cjthe Intercity Transportation Information generation time period, every 15 minutes one section.
Step 304, carry out the exchange of urban traffic information and Intercity Transportation information.Transport information is mainly made up of road section ID, speed (LinkId, Speed).Wherein, urban traffic information is all the same with Intercity Transportation information, is referred to as transport information here, mainly by road section ID, and speed composition.
Taking the Intercity Transportation information of Beijing-tianjin-hebei Region and Beijing, the urban traffic information in Tianjin, Baoding illustrates the switching method of urban traffic information and Intercity Transportation information as example, the exchange flow process of urban traffic information and Intercity Transportation information as shown in Figure 5, comprises the following steps:
Step 3040, initialization road network information, initialization tCur=0.TCur represents current slot, if current slot has carried out transport information exchange, has exchanged with regard to not needing again.As: step 3041 is calculated current time period t New, only has when just exchanging when tNew ≠ tCur in step 3042, after having exchanged, in step 3049, tCur is revised again; In the time again entering the same time period, exchange with regard to not needing to carry out again transport information, because exchange tNew=tCur, continue execution step 3041, until the next time period exchanges.
Road network exactly initialization road network loads this region (as: Beijing-Tianjin Ji), has recorded CITYCODE and the INTERCITY information in section here, is convenient to transport information exchange below.
Step 3041, calculate current slot tNew according to system time.If: system time is between 00:00～00:05, tNew=1.
If step 3042 tNew ≠ tCur, performs step 3043; Otherwise execution step 3041.
Step 3043, extract urban traffic information (TrafficCity) according to date D and time period t New, as Beijing C
bj.
If step 3044 tNew%n=0, Intercity Transportation information is upgraded, and performs step 3045; Otherwise execution step 3046.
Step 3045, extract Intercity Transportation information (TrafficInterCity) according to date D and time period t New, and extract the Intercity Transportation information E in described city according to the index of Intercity Transportation information
bj.
The Intercity Transportation information E of step 3046, traversal Beijing area
bj, comprised at urban traffic information C
bjin the transport information in non-existent section add in urban traffic information, the Traffic In Beijing information after exchanging and generating is:
wherein, LinkId is exactly the unique identification of road network.
If step 3047 tNew%n=0, represents this generation Intercity Transportation information, perform step 3048, otherwise execution step 3049.
Step 3048, traversal Beijing Traffic information C
bj, at Intercity Transportation information E
bjin do not exist and the section of INTERCITY=1 adds in Intercity Transportation information, thereby obtain intercity exchange and generate after transport information be:
wherein, LinkId is exactly the unique identification of road network.
Step 3049, tCur=tNew, forward step 3041 to.This step is to upgrade current slot, and the transport information that represents this time period has exchanged complete, is mainly to express the meaning that a circulation is carried out.
The embodiment of the present invention proposes a kind of city Intercity Transportation information switching method and system efficiently, Intercity Transportation information is added in urban traffic information, also urban traffic information is added in Intercity Transportation information, increased the coverage rate of urban traffic information and Intercity Transportation information simultaneously; Meanwhile, there is the interaction between urban traffic information and Intercity Transportation information, can increase the accuracy rate of city and intercity road network overlay region.
In a word, the foregoing is only preferred embodiment of the present invention, be not intended to limit protection scope of the present invention.
Claims (6)
1. a switching method for transport information, is characterized in that, comprising:
Intercity processing road network and city processing road network are carried out to pre-service and be superimposed, form the total road network after integrating; Extract urban traffic information and Intercity Transportation information, in described total road network, carry out the exchange of urban traffic information and Intercity Transportation information.
2. the switching method of transport information according to claim 1, is characterized in that, the method also further comprises before pre-service carrying out: the storage organization that Intercity Transportation information is set; Described storage organization is made up of file header, city index and transport information three parts, wherein, file header record version this shop, region, generation time, reference position and the side-play amount of each city storage transport information of city index record, transport information records the transport information in every section according to section.
3. the switching method of transport information according to claim 1 and 2, is characterized in that, described pretreated step is specially: intercity processing road network and city processing road network are formatd.
4. the switching method of transport information according to claim 3, is characterized in that, the total road network after described integration specifically comprises:
The road network filtering out according to administrative division is processed to road network as city, and mark INTERCITY=0; The road network filtering out according to the connectedness of category of roads and road is as intercity processing road network, and mark INTERCITY=1.
5. the switching method of transport information according to claim 4, is characterized in that, the step of described extraction urban traffic information and Intercity Transportation information specifically comprises:
Floating Car sampling period T=5 minute is set, within one day 24 hours, is divided into 288 cycles, k=1,2 ..., 288, wherein k is the sampling period being divided for 24 hours for one day, k=1 represents 00:00～00:05; K=288 represents 23:55～00:00;
City is at t
cs=kT(k=1,2 ..., 288) and moment generation transport information, intercity at t
cj=k, T(k ,=nk, nk<=288) moment generation transport information, wherein, t
csthe rise time section of urban traffic information, t
cjit is the Intercity Transportation Information generation time period.
6. the switching method of transport information according to claim 5, is characterized in that, described in carry out urban traffic information and Intercity Transportation message exchange step specifically comprise:
A, initialization road network information, initialization tCur=0, tCur represents current slot;
B, calculate current slot tNew according to system time;
If c is tNew ≠ tCur, perform step d; Otherwise execution step b;
D, extract urban traffic information C according to date D and time period t New
1;
If e is tNew%n=0, expression Intercity Transportation information is upgraded, and performs step f; Otherwise execution step g;
F, extract Intercity Transportation information according to date D and time period t New, and extract the Intercity Transportation information E in described city according to the index of Intercity Transportation information
1;
G, travel through the Intercity Transportation information E in described city
1, comprised at urban traffic information C
1in the transport information in non-existent section add in urban traffic information, the urban traffic information after exchanging and generating is:
wherein, LinkId is the unique identification of road network;
If h is tNew%n=0, represent this generation Intercity Transportation information, perform step i, otherwise execution step j;
I, travel through described urban traffic information C
1, will be at Intercity Transportation information E
1in do not exist and the section of INTERCITY=1 adds in Intercity Transportation information, thereby the Intercity Transportation information after being exchanged and generating is:
and INTERCITY=1, wherein, LinkId is the unique identification of road network;
J, setting tCur=tNew, execution step b.
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Address after: 100193 No. 301, block B, building 27, phase 1, Zhongguancun Software Park, No. 8, northeast flourishing West Road, Beijing, Haidian District Patentee after: Beijing city Mdt InfoTech Ltd Address before: 100191 Beijing City, Haidian District Xueyuan Road No. 39 Building 9 layer solid Patentee before: Beijing PalmCity Technology Co., Ltd. |