WO2020192123A1

WO2020192123A1 - Method for improving accuracy of positioning traffic accident site

Info

Publication number: WO2020192123A1
Application number: PCT/CN2019/115221
Authority: WO
Inventors: 吕伟韬; 彭沛炎; 蒋丽丽; 饶欢
Original assignee: 江苏智通交通科技有限公司
Priority date: 2019-03-27
Filing date: 2019-11-04
Publication date: 2020-10-01
Also published as: CN109993971B; CN109993971A

Abstract

A method for improving the accuracy of positioning a traffic accident site. In the method, key geographic location information is extracted by means of a method of word segmentation according to a text message of an accident location in traffic accident information records, and by combining a city map shpefile file with a city point of interest (POI), a spatial algorithm is used to determine the specific location of an accident. First, text information of the accident location in the traffic accident information records is extracted, and after word segmentation, landmark site name information of roads, buildings, stores, etc. in the accident site is obtained. Then, it is determined whether road information is comprised in the site name information. If comprised, then the number of roads is further determined. By means of combining a road name with the map shpefile file and POI point coordinates, a specified method is used to obtain traffic accident site coordinates. If not comprised, the POI point coordinates or the center of gravity of a plurality of POI point coordinates in the traffic accident information records are directly extracted as corresponding traffic accident site coordinates. The present method improves the accuracy of positioning a traffic accident site.

Description

A Method to Improve the Accuracy of Location Location of Traffic Accidents

Technical field

The invention belongs to the technical field of intelligent transportation, is applied to the location of traffic accident locations, and specifically relates to a method for improving the location accuracy of traffic accident locations.

Background technique

In recent years, with the gradual deepening of urbanization and rapid economic development in China, the number of motor vehicles has increased rapidly, and urban traffic problems have become more prominent. Among them, road traffic accidents have the greatest impact on urban traffic operations. After a road traffic accident occurs, the traffic police must rush to the scene to investigate and deal with the accident. In the traffic accident certification issued, the traffic police must record the location of the traffic accident and other related information. This information is not only used for accident liability determination and other legal accidents, It is also used for traffic safety management work such as urban traffic accident black spot management and traffic safety early warning. As the urban traffic safety situation becomes more and more severe, the governance and improvement of the traffic environment is imminent.

Urban traffic accident blackspot management is to determine the relatively most dangerous roads and intersections with high incidence of accidents through statistics and analysis of the location of the accident and other information. These areas that need safety improvement and governance are called black spots. The judgment of black spots needs to be based on a large amount of historical accident data. Therefore, the accident location needs to be recorded and stored concisely and effectively, and the accident location data can be accurately located on the electronic map. And statistical analysis. According to statistics, after complex semantic recognition and manual sorting of accident location records, the location rate of accident locations can only reach 58%, and the remaining location records cannot be located at all.

The records of traffic accident information are all text information, such as "Meifeng Road Liheyuan Gate", "Chaoyang Road Zhujiang Road West Section", "Chaohua Trade City D District Warehouse Gate", etc., without format requirements and Restrictions, with the ambiguity of human factors, and the text information cannot be directly reflected on the electronic map, and it is difficult to split into effective usable information, and it is difficult to verify the true and accurate location described afterwards.

At present, for the method of locating the location of traffic accidents, patent CN200410044508 proposes a method to realize automatic recording of automobile traffic accidents, using the IPV6 address on the wireless communication device configured on the car to confirm the location of the accident. Patent CN201320002998.X proposes a traffic violation coordination positioning system based on NFC and GPS, which uses data interaction between a mobile positioning terminal and multiple BFC hotspots to obtain location information of traffic accidents. Patent CN201210297477.1 proposes an automatic recording and positioning method for semantic representation information of traffic accident locations, which realizes location recording and positioning according to the user's selection of road sections, lateral directions, directions, distances, reference points, etc.

However, the patent CN200410044508 and the patent CN201320002998.X both rely on vehicle equipment, mobile positioning terminals and wireless communication network conditions, and cannot be universally applied. At the same time, they cannot be applied to the daily work specifications of traffic police; in the method of patent CN201210297477.1, users and systems There are many interactions, which is not applicable to the positioning of the accident text information.

Summary of the invention

The purpose of the present invention is to provide a method for improving the accuracy of the location of traffic accidents, which can solve the problem of inaccurate location of the existing traffic accident locations. The specific technical solutions are as follows:

A method for improving the accuracy of traffic accident location location. The method extracts key geographic location information through word segmentation based on the text message of the accident location recorded by the traffic accident information, and combines the city map shpefile file and the city point of interest POI utilization space The algorithm determines the specific location of the accident, including the following steps:

S1. Extract the text information of the accident location in the traffic accident information record;

S2, according to the accident location in the traffic accident information record, perform word segmentation processing on the text information, and extract the landmark location name information such as roads, buildings, and stores in the accident location;

S3. Determine whether the location name information includes road information, and if so, use the road names corresponding to all roads obtained after word segmentation as a set _Li = {L ₁ ,L ₂ ,L ₃ ,...,L _i }, and take all location name information except road names as a set P _i ={P ₁ ,P ₂ ,P ₃ ,...,P _i }, go to step S4; if not, directly extract traffic accident information The POI point coordinates in the record or the center of gravity of multiple POI point coordinates are used as the location coordinates of the corresponding traffic accident;

S4. Judge the number of roads based on the road information. If there is only one road, use the method of combining the road name with the map shpefile and POI point coordinates to obtain the location coordinates of the traffic accident by projecting the POI points onto the road; if the number of roads is there If there are two, the road name is combined with the shpefile file to obtain the intersection points between all roads using a spatial algorithm, and the center of gravity coordinates of the polygon formed by the intersections are calculated, and the center of gravity coordinates are used as the location coordinates of the corresponding traffic accident.

Further, in step S3, if the location name information does not contain road information, the POI coordinates of buildings, stores, etc. are obtained through the geocoding API analysis of the WEB map service provider, POI thesaurus matching, etc., and the obtained POI coordinates That is, as the coordinates of the accident location; if more than one POI is included in the accident location information, take the center of gravity of these POIs as the location coordinates of the traffic accident.

Further, in step S4, if the location name information contains only one road, the method for determining the location coordinates of the traffic accident is:

A. Use the building, store and other information in the old information to obtain the POI point coordinates of the building, store, etc. through the geocoding API analysis of the WEB map service provider, POI thesaurus matching, etc.;

B. Extract the road name and combine with the map shpefile file to obtain a collection of all road sections about the road name;

C. Traverse all the road section sets, calculate the distance from the POI point coordinates to the road section where the traffic accident occurred, and take the road section with the shortest distance as the target road;

D. Obtain the coordinates of the two end points of the target road section, and project the POI point onto the road section. The obtained projection point coordinates are the coordinates of the accident site.

Further, in step S4, if the location name information contains only two roads, the method for determining the location coordinates of the traffic accident is:

a, extracting two road name, binding shpefile map file, get all links set on two roads _{_{L i = {L 1, L}} 2, L 3, ..., L i};

b. Using the traversal method, traverse all the road sections of the two roads, obtain the set of intersecting road sections L′ _i ={L′ ₁ ,L′ ₂ ,L′ ₃ ,...,L′ _i }, and calculate all the intersections coordinate;

c. Judge the number of intersections. If the number of intersections is less than 3, the coordinates of the accident site are the average of the intersection coordinates; if the number of intersections is not less than 3, the coordinates of the accident site are composed of intersections The coordinates of the center of gravity of the polygon.

Further, the calculation formula for the location coordinates of the traffic accident when the number of intersections is less than 3 is:

Among them, X and Y are the abscissa and ordinate values of the coordinates of the traffic accident location respectively. Assuming that the intersection of two roads is M and N respectively, then X _M , Y _M and X _N , Y _N intersection M, N The abscissa value and ordinate value of;

The calculation formula for the location coordinates of a traffic accident when the number of intersections is greater than or equal to 3 is:

Among them, n is the number of intersections.

The method for improving the location accuracy of a traffic accident location of the present invention is to obtain location name information after word segmentation processing by recording the text information of the accident location recorded by the traffic accident information, and on this basis, combining the city map shpefile file and the city point of interest POI, Use spatial algorithms to determine the specific location of the accident; among them, if the location name information does not contain the relevant road name, the POI coordinate points in the traffic accident information record are directly used to obtain the coordinates of the accident location; if the location name information is When the relevant road name is included, it is necessary to obtain the POI coordinates of buildings, stores, etc. through the geocoding API analysis of the WEB map service provider, POI thesaurus matching, etc. The obtained POI coordinates are used as the coordinates of the accident location, and the space algorithm is used to determine the accident location Coordinates; Compared with the prior art, the present invention changes the current situation of relying on external equipment to obtain accident location information, and solves the problem of inaccurate location of the existing traffic accident location; at the same time, the present invention can use the location information in the accident information record , Combined with city map shpfile files and city POI points to determine the spatial location of traffic accidents; provide data support for city accident statistics, accident black spot investigation, accident warning and other analysis.

Description of the drawings

FIG. 1 is a schematic block diagram of the flow of the method for improving the accuracy of the location of a traffic accident according to an embodiment of the present invention;

2 to 6 are schematic diagrams of solving the coordinates of traffic accident locations where the location name information contains different numbers of roads in an embodiment of the invention.

detailed description

In order to enable those skilled in the art to better understand the solutions of the present invention, the technical solutions in the embodiments of the present invention will be described clearly and completely in conjunction with the accompanying drawings in the embodiments of the present invention.

Referring to FIG. 1, in an embodiment of the present invention, a method for improving the location accuracy of a traffic accident location is provided. The method extracts key geographic location information by word segmentation according to the text message of the accident location recorded by the traffic accident information , Combining the city map shpefile file and the city point of interest POI to use the spatial algorithm to determine the specific location of the accident, including the following steps:

S1. Extract the text information of the accident location in the traffic accident information record.

S2. According to the accident location in the traffic accident information record, perform word segmentation on the text information, and extract the landmark location name information such as roads, buildings, and stores in the accident location; for example, "Xiaolin Road", "Zhonghua Road" ", "Suguo Supermarket", "RT-Mart", etc.

S3. Determine whether the location name information contains road information, and if so, use the road names corresponding to all roads obtained after word segmentation as a set _Li = {L ₁ ,L ₂ ,L ₃ ,...,L _i } , And take all location name information except road names as the set P _i ={P ₁ ,P ₂ ,P ₃ ,...,P _i }, go to step S4; if not, directly extract the traffic accident information record The POI point coordinates or the center of gravity of multiple POI point coordinates are used as the location coordinates corresponding to the traffic accident. Specifically, the POI coordinates of buildings, stores, etc., are obtained through the geocoding API analysis of the WEB map service provider, POI word database matching, etc., The obtained POI coordinates are the coordinates of the accident location; if more than one POI is included in the accident location information, the center of gravity of these POIs is taken as the location coordinates of the traffic accident.

S4. Judge the number of roads based on the road information. If there is only one road, use the method of combining the road name with the map shpefile and POI point coordinates to obtain the location coordinates of the traffic accident by projecting the POI points onto the road; if the number of roads is there For two, the intersections between all roads are obtained by the road name combined with the shpefile file, and the spatial algorithm is used to calculate the center of gravity coordinates of the polygon that forms the intersection, and the center of gravity coordinates are used as the coordinates of the location of the corresponding traffic accident.

In the embodiment, if only one road is included in the location name information, the method for determining the location coordinates of the traffic accident is:

First, use the building, store and other information in the old information to obtain the POI point coordinates of the building, store, etc. through the geocoding API analysis of the WEB map service provider, POI vocabulary matching, etc.; then, extract the road name and combine the map shpefile file , Get the set of all road sections about the road name; then, traverse all the road section sets, calculate the distance from the POI point coordinates to the road section where the traffic accident occurs, and take the shortest distance road section as the target road; finally, get the two end coordinates of the target road section, Project the POI point onto the road section, and the obtained projected point coordinates are the coordinates of the accident location; refer to Figure 1, assuming that the accident location of the traffic accident is O, road section AB and road section CD are the same road up and down, road section AB The endpoint coordinates of are respectively A(X _A ,Y _A ), B(X _B ,Y _B ), and the endpoint coordinates of road section CD are C(X _C ,Y _C ), D(X _D ,Y _D ); coordinate points P(P _X , P _Y ) is the point with the shortest distance from the road section AB in the POI point, and the solution formula for the abscissa value X and the ordinate value Y of the incident location O(X,Y) is:

Among them, k _AB is the slope of section AB.

In a specific embodiment, if only two roads are included in the location name information, the method for determining the location coordinates of a traffic accident is:

First, extract the road name two, binding shpefile map file, get all links set on two roads _{_{L i = {L 1, L}} 2, L 3, ..., L i}; then traversal method, Traverse all the sections of the two roads, obtain the set of intersecting sections L′ _i ={L′ ₁ ,L′ ₂ ,L′ ₃ ,...,L′ _i }, and calculate the coordinates of all the intersections; finally, determine the intersection If the number of intersections is less than 3, the coordinates of the accident site are the average of the coordinates of the intersections; if the number of intersections is not less than 3, the coordinates of the accident site are the coordinates of the center of gravity of the polygon formed by the intersections.

Referring to Figure 3, if there is an intersection M between the road AB and the road EF, the end coordinates of the road section AB are A(X _A ,Y _A ) and B(X _B ,Y _B ), and the end coordinates of the road section EF are respectively For, E(X _E ,Y _E ), F(X _F ,Y _F ), the formulas for solving the abscissa value X _M and the ordinate value Y _M of the coordinate M (X _M , Y _M ) of the intersection M are respectively :

Among them, k _AB is the slope of section AB, and k _EF is the slope of section EF.

If a traffic accident occurs at a location where one road is a two-way road, and the other is a one-way road that turns into a two-way road, refer to Figure 4. There are three intersections between the two roads. Specifically, section EF and section HI are on the same road. Up and down, section AM is the same road as section BN and section DK, section AM is a one-way street, section BN and section DK are the same road up and down, M (X _M , Y _M ) is the difference between section AM and section EF Intersection coordinates, N (X _N , Y _N ) is the intersection coordinate of road section BN and road section HI, K (X _K , Y _K ) is the intersection point of road section DK and road section HI, O (X, Y) is the accident location Coordinates; at this time, the calculation formula for the location coordinates of a traffic accident is:

Among them, n is the number of intersections.

Referring to Figure 5, in other embodiments, if the two roads are both two-lane roads, that is, section AB and section CD are the up and down lines of the same road, section EF and section HI are the up and down lines of the same road, M(X _M ,Y _M ) is the coordinate of the intersection of road section AB and section EF, N(X _N ,Y _N ) is the coordinate of the intersection of road section AB and section HI, G(X _G ,Y _G ) is the intersection of road section CD and road section EF Point coordinates, K (X _K , Y _K ) is the coordinate of the intersection of road section CD and road section HI, and O (X, Y) is the coordinates of the accident location; the same formula is used:

with

Calculate the values of the abscissa X and ordinate Y of O(X, Y) to obtain the location coordinates of the traffic accident.

Refer to Figure 6, when two roads contain a one-way road AB, and the other is a road that includes the up and down roads EF and HI, the intersection of the one-way AB road section EF and the road section HI is M, N, and two The abscissa and ordinate values of the intersection are X _M , Y _M and X _N , Y _N , then the location coordinates of the traffic accident O(X,Y) can be obtained, and the solution formula for the abscissa value X and the ordinate value Y is :

The obtained coordinate point O(X, Y) is the coordinate location of the traffic accident.

The method for improving the location accuracy of a traffic accident location of the present invention is to obtain location name information after word segmentation processing by recording the text information of the accident location recorded by the traffic accident information, and combining the city map shpefile file and the city point of interest POI on this basis, Use spatial algorithms to determine the specific location of the accident; among them, if the location name information does not contain the relevant road name, the POI coordinate points in the traffic accident information record are directly used to obtain the coordinates of the accident location; if the location name information is When the relevant road name is included, it is necessary to obtain the POI coordinates of buildings, stores, etc. through the geocoding API analysis of the WEB map service provider, POI thesaurus matching, etc. The obtained POI coordinates are used as the coordinates of the accident location, and the space algorithm is used to determine the accident location Coordinates; Compared with the prior art, the present invention changes the current situation of relying on external equipment to obtain accident location information, and solves the problem of inaccurate location of the existing traffic accident location; at the same time, the present invention can use the location information in the accident information record , Combined with city map shpfile files and city POI points to determine the spatial location of traffic accidents; provide data support for city accident statistics, accident black spot investigation, accident warning and other analysis.

The above are only the preferred embodiments of the present invention, but do not limit the scope of the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, for those skilled in the art, they can still comment on the foregoing specific The technical solutions recorded in the implementation manners are modified, or some of the technical features are equivalently replaced. Any equivalent structure made by using the contents of the specification and drawings of the present invention, directly or indirectly used in other related technical fields, is similarly within the protection scope of the present invention.

Claims

A method for improving the location accuracy of traffic accidents, characterized in that the method extracts key geographic location information by word segmentation according to the text message of the accident location recorded by the traffic accident information, and combines the city map shpefile file and the city interest Point POI uses spatial algorithms to determine the specific location of the accident, including the following steps:

S1. Extract the text information of the accident location in the traffic accident information record;

S2, according to the accident location in the traffic accident information record, perform word segmentation processing on the text information, and extract the landmark location name information such as roads, buildings, and stores in the accident location;

S3. Determine whether the location name information includes road information, and if so, use the road names corresponding to all roads obtained after word segmentation as a set Li = {L 1 ,L 2 ,L 3 ,...,L i }, and take all location name information except road names as a set P i ={P 1 ,P 2 ,P 3 ,...,P i }, go to step S4; if not, directly extract traffic accident information The POI point coordinates in the record or the center of gravity of multiple POI point coordinates are used as the location coordinates of the corresponding traffic accident;

S4. Judge the number of roads based on the road information. If there is only one road, use the method of combining the road name with the map shpefile and POI point coordinates to obtain the location coordinates of the traffic accident by projecting the POI points onto the road; if the number of roads is there If there are two, the road name is combined with the shpefile file to obtain the intersection points between all roads using a spatial algorithm, and the center of gravity coordinates of the polygon formed by the intersections are calculated, and the center of gravity coordinates are used as the location coordinates of the corresponding traffic accident.
The method for improving the location accuracy of a traffic accident location according to claim 1, wherein, in step S3, if the location name information does not include road information, it is analyzed through the geocoding API of the WEB map service provider, POI word database matching and other methods to obtain POI coordinates such as buildings and stores, the obtained POI coordinates are used as the accident location coordinates; if the accident location information contains more than one POI, the center of gravity of these POIs is taken as the location coordinates of the traffic accident.
The method for improving the location accuracy of a traffic accident according to claim 1, wherein in step S4, if the location name information contains only one road, the method for determining the location coordinates of the traffic accident is:

A. Use the building, store and other information in the old information to obtain the POI point coordinates of the building, store, etc. through the geocoding API analysis of the WEB map service provider, POI thesaurus matching, etc.;

B. Extract the road name and combine with the map shpefile file to obtain a collection of all road sections about the road name;

C. Traverse all the road section sets, calculate the distance from the POI point coordinates to the road section where the traffic accident occurred, and take the road section with the shortest distance as the target road;

D. Obtain the coordinates of the two end points of the target road section, and project the POI point onto the road section. The obtained projection point coordinates are the coordinates of the accident site.
The method for improving the location accuracy of a traffic accident according to claim 1, wherein in step S4, if the location name information contains only two roads, the method for determining the location coordinates of the traffic accident is:

a, extracting two road name, binding shpefile map file, get all links set on two roads L i = {L 1, L 2, L 3, ..., L i};

b. Using the traversal method, traverse all the road sections of the two roads, obtain the set of intersecting road sections L′ i ={L′ 1 ,L′ 2 ,L′ 3 ,...,L′ i }, and calculate all the intersections coordinate;

c. Judge the number of intersections. If the number of intersections is less than 3, the coordinates of the accident site are the average of the intersection coordinates; if the number of intersections is not less than 3, the coordinates of the accident site are composed of intersections The coordinates of the center of gravity of the polygon.
The method for improving the location accuracy of a traffic accident location according to claim 4, wherein the calculation formula for the location coordinates of the traffic accident when the number of intersections is less than 3 is:

Among them, X and Y are the abscissa and ordinate values of the coordinates of the traffic accident location respectively. Assuming that the intersection of two roads is M and N respectively, then X M , Y M and X N , Y N intersection M, N The abscissa value and ordinate value of;

The calculation formula for the location coordinates of a traffic accident when the number of intersections is greater than or equal to 3 is:

Among them, n is the number of intersections.