JP2005300394A - Position information transmission unit and method thereof - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To accurately transmit position information of a specified site without displacement even if different map databases are used by transmitting and receiving sides. <P>SOLUTION: In a device 100 at the transmitting side, configuration data containing the site corresponding to transmission object information is generated at a configuration data generating section 105 from transmission object information of the transmission object information database 103 and map data of the digital map database 101, while attribute information with nodes such as intersection in configuration data as a referring data is added to generate position referring information containing configuration data and attribute information at an attribute information setting unit 106. In a device 200 at the receiving side, based on received position referring information and map data from the digital map database 207, map-matching is performed in a map-matching section 205 to specify object road section, the position of reference point after map-matching is corrected using attribute information in a position correcting section 209, and then the position of corresponding site to transmission object information is corrected. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a position information transmission apparatus and method for transmitting position information generated based on map data stored in a map database.

  As a system using digital map information, for example, a car navigation device that is mounted on a vehicle and displays a map around the current location, traffic information, and the like has become widespread. The car navigation device maintains a digital map database and displays a map around the vehicle position on the screen based on the latitude and longitude data received by the GPS receiver. It can also be displayed on the map. Also, in recent car navigation systems, traffic information such as traffic jam information and accident information provided from the traffic information provision system is received, and traffic jams and accident locations are displayed on a map, or such information is added to conditions. Route search can be carried out.

  VICS (Road Traffic Information Communication System), which currently provides traffic information services for car navigation systems, collects and edits road traffic information from vehicle detectors and image sensors installed on the road. Traffic congestion information such as traffic jam information and travel time information indicating the required time is provided through FM multiplex broadcasting and road beacons. The car navigation device using the traffic information provided by the VICS has a digital map database in which a VICS link number is defined in the road network, and the target road of the traffic information is determined from the VICS link number included in the VICS information. Identify. However, the link numbers defined in the road network need to be replaced with new ones as new or changed roads, and the digital map data produced by each company must be updated accordingly. In this method, the road position is specified with a great social cost for maintenance.

  In order to improve such a point, Patent Document 1 proposes a method for transmitting a position on a digital map using shape data indicating a road shape or the like of a predetermined road section without using a common link number. FIG. 10 is a diagram for explaining the shape data. In the method using the shape data, as shown in FIG. 10A, the transmitting side sets a plurality of nodes p1, p2,... PN on the road section to be transmitted on the digital map on the transmitting side, As shown in FIG. 10B, “shape data” in which position data of the plurality of nodes p1, p2,. For example, when notifying the position of the accident that occurred in this road section, this shape data and the distance from the reference node (for example, p1) to the accident position are transmitted to the receiving side. The receiving side specifies a road section by performing map matching that associates each node position included in the shape data on its own digital map, and specifies an accident position based on distance information from the reference node.

  FIG. 11 is a diagram showing the relationship between shape data and event information such as accidents and traffic jams. As shown in FIG. 11A, the shape data includes a reference node 11 represented by an absolute position (absolute latitude / longitude, absolute azimuth, etc.) in which a plurality of nodes are set along the road shape of the target road section. , And a relative node 13 expressed by a relative position (relative coordinates, declination, relative distance, etc.) with an adjacent node. Also, event information such as accidents and traffic jams is expressed in hundreds of meters from the reference node 11 as shown in FIG. 11B using the shape data.

  By the way, the digital map database is provided with a plurality of types created respectively by a plurality of companies. In the position information transmission method as described above, when the digital map database used on the transmission side and the digital map database used on the reception side are different, the event occurrence point represented by the relative position from the reference node is displayed on the reception side. When doing so, positional misalignment may occur.

  For example, as shown in FIG. 12, even in the same road section, the method of creating a digital map database is not uniform and differs slightly between companies, so that the company A used on the transmission side shown in FIG. In the digital map database, seven nodes are set, whereas in the digital map database of company B used on the receiving side shown in FIG. 12B, there may be a case where only four nodes are set. In such a case, when the event information that an accident has occurred at the point of how many meters from the reference node of the shape data is generated and distributed based on the digital map database of company A on the transmitting side, On the receiving side using the company's digital map database, a situation may occur in which the event occurrence point is recognized and displayed at a shifted position.

  In addition, different types of digital map databases may differ in the scale (accuracy) of the reference map, and the representation method of lanes, intersections, branches, etc. may differ, so the digital map database on the sending side and receiving side If the type of traffic is different, the receiving side may misrecognize the location of an event such as a traffic jam or an accident, or the location of a specific facility such as a parking lot or store, at a location that is before or after an intersection or branch. There is. Furthermore, as described above, when the expression methods such as the intersection and the branching portion are different, if the reference point is placed at these positions, the position of the reference point itself is also shifted.

JP 2001-41757 A

  The present invention has been made in view of the above circumstances, and even when different map databases are used on the transmission side and the reception side, the position information of a specific point is accurately transmitted so that no positional deviation occurs. It is an object of the present invention to provide a position information transmission apparatus and method capable of performing the above.

  The position information transmission apparatus of the present invention is a position information transmission apparatus that transmits position information generated based on map data stored in a map database, and is generated based on map data of a first map database. Further, using the position reference data representing the target road section corresponding to the transmission target information, a specific point that can specify the front and rear positions on the road in the position reference data is set as a reference point for position correction, and the attribute relating to the specific point It has attribute information setting means for setting information, and includes an encoder that generates position reference information including the position reference data and the attribute information.

  Thereby, when transmitting the generated position reference information, the reception side can correct the front and rear positions of the reference point on the road using the attribute information set at the specific point in the position reference data. . For this reason, even when different map databases are used on the transmission side and the reception side, it is possible to accurately transmit the position information of the specific point so as not to cause a position shift.

Further, as one aspect of the present invention, the position information transmission device described above, the position reference generating position reference data representing the target road section corresponding to the transmission target information based on the map data of the first map database Those having data generation means are also included.
Thereby, the position reference data of the target road section corresponding to the transmission target information can be generated, and the position reference information including the position reference data and the attribute information of the characteristic point for position correction can be generated.

Further, as one aspect of the present invention, the position information transmission device described above may include a transmission unit that transmits the position reference information including the position reference data and the attribute information and the transmission target information.
Thereby, for example, position reference information including position reference data and attribute information can be transmitted together with transmission target information such as event information such as traffic jams and accidents and POI information indicating a place such as a facility.

  The position information transmission apparatus of the present invention is a position information transmission apparatus that transmits position information generated based on map data stored in a map database, and is generated based on map data of a first map database. Further, using the position reference data representing the target road section corresponding to the transmission target information and the map data of the second map database, the target road section in the second map database is specified by map matching processing. Based on the map matching means and attribute information set at a specific point of the position reference data, the front and rear positions of the reference point on the road are corrected when the attribute information corresponds to a reference point for position correction. A position correcting means for analyzing the position reference information including the position reference data and the attribute information. A.

  Thereby, when acquiring and analyzing position reference information, it is possible to correct the front-rear position on the road of the reference point after map matching based on the attribute information set at a specific point in the position reference data Become. For this reason, even when the first map database on the transmission side is different from the second map database on the reception side, the position information of the specific point is accurately transmitted so that the position mismatch in the map matching result does not occur. be able to.

In addition, as one aspect of the present invention, the position information transmission device described above may include a receiving unit that receives the position reference information including the position reference data and the attribute information, and the transmission target information.
Accordingly, for example, position reference information including position reference data and attribute information is received together with transmission target information such as event information such as traffic jams and accidents, POI information indicating a place such as a facility, and the like. Position correction on the map can be performed.

According to another aspect of the present invention, in the position information transmission device, the position correction unit is configured to transmit transmission target information corresponding to position reference data including the reference point according to the position correction of the reference point. Also included are those that correct the position.
Accordingly, more accurate position information can be obtained with respect to the transmission target information by correcting the position of the transmission target information according to the position correction of the reference point.

Further, as one aspect of the present invention, the position information transmission device described above includes an information use unit that uses the position-corrected transmission target information in association with a map in the second map database. It is.
Moreover, as one aspect of the present invention, in the position information transmission device described above, as the information utilization unit, a display unit that displays a screen of the transmission target information, a route calculation that performs a route calculation based on the transmission target information And at least one of voice guidance means for performing voice guidance based on the transmission target information is also included.
Thereby, the screen display of the transmission target information, the route calculation based on the transmission target information, the voice guidance, and the like can be performed at an accurate position on the map by the second map database, and the transmission target information can be utilized.

Further, as one aspect of the present invention, in the position information transmission device described above, the position reference data includes shape data including a plurality of nodes representing the shape of the target road section, and the specific point is Also included are specific nodes in the shape data.
As a result, when the position information is transmitted using shape data having a plurality of nodes corresponding to the target road section, the attribute information set for the specific node is used for the front and rear of the reference point on the road. The position can be corrected.

Further, as one aspect of the present invention, in the position information transmission device described above, the attribute information includes an intersection, a branching portion, a curved portion having a predetermined angle or more, a railroad crossing, a tunnel end, a bridge end, and an administrative boundary. One of the intersections.
Thereby, a specific point such as an intersection or a branching portion in the position reference data is used as a reference point, and position correction can be performed easily and appropriately at the position of this reference point.

  The position information transmission method of the present invention is a position information transmission method for transmitting position information generated based on map data stored in a map database, and is generated based on map data in a first map database. Further, using the position reference data representing the target road section corresponding to the transmission target information, a specific point that can specify the front and rear positions on the road in the position reference data is set as a reference point for position correction, and the attribute relating to the specific point A step of setting information, and a step of transmitting position reference information including the position reference data and the attribute information.

  As a result, the receiving side that acquires the position reference information can correct the front-rear position of the reference point on the road using the attribute information set at the specific point in the position reference data. For this reason, even when different map databases are used on the transmission side and the reception side, it is possible to accurately transmit the position information of the specific point so as not to cause a position shift.

  The position information transmission method of the present invention is a position information transmission method for transmitting position information generated based on map data stored in a map database, and is generated based on map data in a first map database. Receiving position reference information including position reference data representing a target road section corresponding to transmission target information and attribute information set at a specific point of the position reference data; the position reference data; The step of specifying the target road section in the second map database by map matching processing using the map data of the map database, and the attribute information corresponding to a reference point for position correction And a step of correcting the front-rear position of the reference point on the road.

  Accordingly, it is possible to correct the front and rear positions of the reference point after map matching on the road based on the attribute information set at the specific point in the position reference data using the received position reference information. For this reason, even when the first map database on the transmission side is different from the second map database on the reception side, the position information of the specific point is accurately transmitted so that the position mismatch in the map matching result does not occur. be able to.

In addition, the present invention provides a program for realizing the function of each unit in the position information transmission device described above.
In addition, the present invention provides a program for executing each procedure in the position information transmission method described above.
When transmitting position reference information according to the above program, on the receiving side, it is possible to correct the front and rear positions of the reference point on the road using the attribute information set at a specific point in the position reference data. Even when different map databases are used on the transmission side and the reception side, it is possible to accurately transmit the position information of the specific point so as not to cause a position shift.

  According to the present invention, even when different map databases are used on the transmission side and the reception side, the position information transmission device capable of accurately transmitting the position information of a specific point so as not to cause a position shift. And methods can be provided.

  In the present embodiment, an example in which the position information transmission apparatus and method according to the present invention are applied to a position information providing system that is mainly used for a car navigation apparatus provided in a vehicle or the like is shown. Here, as an example of the position reference data, a configuration example in the case of transmitting position information using shape data having a plurality of nodes representing the target road section will be described.

  FIG. 1 is a block diagram showing a configuration of a main part of a position information providing system according to an embodiment of the present invention. The position information providing system includes a transmission-side device 100 such as a center device having an encoder that generates transmission data, and a reception-side device 200 such as a car navigation device that includes a decoder that processes reception data. . Although not shown, data transmission is performed between the transmission side device 100 and the reception side device 200 by communication means such as FM multiplex broadcasting, digital terrestrial broadcasting, road beacons, DSRC (Dedicated Short Range Communication), and cellular phones. Done.

  The transmission-side apparatus 100 includes a digital map database 101, a transmission target information database 103, a shape data generation unit 105, an attribute information setting unit 106, a position reference information storage unit 107, and a data transmission unit 109. Composed. The digital map database 101 stores digitized map data including the shape and names of roads, place names, intersection names, shapes and names of facilities, and the like. The transmission target information database 103 includes event information including traffic information such as traffic jams and accidents, POI (Point Of Interest) information that is a specific target location that is of interest to users such as parking lots, stores, and facilities. Stored. This transmission target information includes information stored in the device in advance, information acquired, collected, generated, etc. transferred elsewhere.

  The shape data generation unit 105 corresponds to an example of a position reference data generation unit. The shape data generation unit 105 performs predetermined encoding processing using information stored in the digital map database 101 and the transmission target information database 103 to obtain event information and POI information. In order to transmit the transmission target information such as, the shape data expressing the shape such as the road shape of the target road section corresponding to the position of the transmission target information is generated. The attribute information setting unit 106 corresponds to an example of an attribute information setting unit, and sets attribute information of a specific node in the shape data. The position reference information storage unit 107 stores position reference information including the generated shape data, attribute information, and transmission target information. The data transmission unit 109 corresponds to an example of a transmission unit, and transmits position reference information to the reception-side apparatus 200.

  The receiving apparatus 200 includes a data receiving unit 201, a position reference information storage unit 203, a map matching unit 205, a digital map database 207, a position correction unit 209, and a display unit 211. The digital map database 207 stores digitized map data including the shape and name of roads, place names, intersection names, and shapes and names of facilities.

  The data reception unit 201 corresponds to an example of a reception unit, and receives the position reference information transmitted from the transmission side device 100. The position reference information storage unit 203 stores the received position reference information. The map matching unit 205 corresponds to an example of a map matching unit, and performs predetermined decoding processing and map matching processing using the received position reference information and map data stored in the digital map database 207, and transmits The obtained shape data is associated with the map data of its own device. The position correction unit 209 corresponds to an example of a position correction unit, and performs position correction on the shape data after the map matching process and the transmission target information based on the attribute information corresponding to the shape data. The display unit 211 corresponds to an example of a display unit as an information utilization unit, and outputs the decoded transmission target information and map information to a display device such as a liquid crystal display. Traffic information and POI information.

  Next, the digital map database used in this embodiment will be described. The digital map database (A) 101 of the transmission-side apparatus 100 and the digital map database (B) 207 of the reception-side apparatus 200 are represented by differences in creator, creation rules, reference map scale (accuracy), and the like. The map information that is displayed may differ slightly. FIG. 2 shows map display examples using different types of digital map databases. In FIG. 2, a display example by the digital map database (A) 101 of the transmission side device 100 is a map A, and a display example by the digital map database (B) 207 of the reception side device 200 is a map B. Here, the map A is a digital map created based on a map with a scale of 1/25000, the map B is a digital map created based on a map with a scale of 1/2500, and the map B is more accurate than the map A. It is high.

  For this reason, the difference in the position of the connection point of a road becomes large in a branching part or a joining part where two roads are connected at a shallow angle like an interchange part of an expressway. For example, in the branch parts 50A and 50B surrounded by an ellipse in the figure, the connection part of the connection path of the branch part 50B of the map B is expressed more finely, and the connection path of the map B than the connection path 51A of the map A Since 51B is displayed for a long time, the positions of the branch points 52A and 52B are shifted and displayed. When an accident or traffic jam occurs around the branch in such a place, the event information is transmitted from the transmission side device 100 to the reception side device 200 and the reception side device 200 identifies the event occurrence position only by the latitude and longitude. Deviation may occur compared to the position of the branch on the map.

  Therefore, in this embodiment, attribute information is set in a specific node of shape data in the position reference information, and the position of the transmission target information is corrected according to the digital map of the receiving device using this attribute information.

(First embodiment)
Next, examples of position reference information and transmission target information in the first embodiment of the present invention will be shown. 3 is a diagram illustrating a first example of the data configuration of the position reference information, FIG. 4 is a diagram illustrating a second example of the data configuration of the position reference information, and FIG. 5 is a diagram illustrating an example of the data configuration of the transmission target information. .

  The position reference information of the first example shown in FIG. 3 is an example in which attribute information is included in the shape data. This position reference information has a plurality of shape data (N in this example) after the header, and has a shape data number and a total number of shape data nodes (L in this example) in each of the shape data 1 to N. Each of the nodes 1 to L has an X-direction absolute coordinate (longitude) and a Y-direction absolute coordinate (latitude) representing the position of the node, and a node attribute. Note that the information indicating the position of each node may be expressed not only by the absolute coordinates of latitude and longitude, but also by relative positions such as relative coordinates, relative distances and declination angles with respect to a predetermined coordinate point.

  Node attribute information includes intersections, branching points, curved portions above a predetermined angle (for example, 80 ° or more), railroad crossings, tunnel ends (entrance or exit), bridge ends (entrance or exit), road attribute changes Points, intersections of administrative boundaries and roads, intersections of underpass and overpass (in this case, there is actually no intersection).

  The position reference information of the second example shown in FIG. 4 is an example in which shape data and attribute information are provided separately. The position reference information in FIG. 4A has a plurality of shape data (in this example, N pieces) after the header as the shape data portion. In each of the shape data 1 to N, the shape data number, the shape data node It has a total number (L in this example), and each of nodes 1 to L has an X-direction absolute coordinate (longitude) and a Y-direction absolute coordinate (latitude) representing the position of the node. Note that the information indicating the position of each node may be expressed not only in absolute coordinates but also in a relative position with respect to a predetermined coordinate point. Further, the position reference information in FIG. 4B has a corresponding shape data number after the header as an attribute information portion, and the shape data of this number has a target node number and a node attribute.

  The transmission target information shown in FIG. 5 is an example of event information related to traffic information such as traffic jams. This transmission target information includes a reference shape data number, a reference node number, an event number and event type, event detail information, event relative position information (relative position with respect to the reference node), and the like. Note that an event represented by a point-like position such as a road closure has one piece of relative position information. In addition, an event represented by a linear or planar position range such as a traffic jam has a plurality of pieces of relative position information such as the start and end positions.

  Next, the operation in the position information providing system of this embodiment shown in FIG. 1 will be described in detail. In the transmission-side apparatus 100, the shape data generation unit 105 acquires transmission target information such as event information and POI information from the transmission target information database 103, and maps data around the point corresponding to the transmission target information from the digital map database 101. Then, shape data including a corresponding point of the transmission target information is generated. The attribute information setting unit 106 extracts, as reference points, points satisfying a predetermined condition in or around the road section indicated by the shape data generated by the shape data generation unit 105, and sets the attribute information of the reference points. This reference point is a point capable of correcting the front-rear position in the road section, such as the above-described intersection or branching portion. Then, the node attribute of this reference point is added as attribute information of the shape data, and position reference information including the shape data and the attribute information is generated. The position reference information and the transmission target information obtained in this way are stored in the position reference information storage unit 107 and appropriately sent to the data transmission unit 109. The data transmission unit 109 converts the position reference information and the transmission target information into a transmission format (transmission data) and transmits the converted information to the reception-side apparatus 200.

  In the receiving device 200, the data receiving unit 201 receives the position reference information and the transmission target information sent from the transmitting device 100 and stores them in the position reference information storage unit 203. The position reference information and the transmission target information stored in the position reference information storage unit 203 are sent in response to requests from the map matching unit 205 and the position correction unit 209, respectively. The map matching unit 205 performs map matching using the shape data and attribute information included in the position reference information and the digital map database 207 of its own device, thereby determining the road section indicated by the shape data, that is, the target road section. It is something to identify. Map data in the digital map database 207 corresponding to the identified target road section is sent from the map matching unit 205 to the position correction unit 209.

  The position correction unit 209 uses the position of the reference point having the node attribute based on the attribute information included in the position reference information and the map data of the digital map database 207 obtained through the map matching unit 205. The position of the corresponding point in the transmission target information is corrected. The display unit 211 displays map information based on the map data acquired from the digital map database 207, and displays transmission target information whose position is corrected in the target road section indicated by the shape data on the map. Note that in the receiving-side apparatus 200, as information utilization means, a route calculation unit that calculates a route to a target point based on transmission target information, and a voice to a user used for driving assistance based on the transmission target information You may make it provide the audio | voice guidance part etc. which perform guidance. As a result, not only screen display but also route calculation, voice guidance, and the like can be performed as utilization of transmission target information.

  Next, the operation of the position correction process in this embodiment will be described in detail with reference to FIGS. FIG. 6 is an explanatory diagram schematically showing the procedure of the position correction process, and FIG. 7 is a flowchart showing the procedure of the position correction process in the transmission side apparatus and the reception side apparatus. Here, the digital map database 101 of the transmitting apparatus 100 has map data corresponding to the map A in FIG. 2, and the digital map database 207 of the receiving apparatus 200 has map data corresponding to the map B in FIG. Is illustrated.

  In the transmitting apparatus 100, as shown in FIG. 6A, the road 21 represented by the map data of the target road section in the digital map database 101 is connected to the road 21 at a shallow angle. It is assumed that there is a road 22 and a traffic jam occurs at the head of the vicinity of a point where these roads 21 and 22 meet. In this case, a branch portion that is a connection point between the roads 21 and 22 is extracted as a reference point P1, and a node attribute of “branch portion” is set to a node indicating the reference point P1. Subsequently, the node attribute “branch part” of the reference point P1 is added as attribute information of the corresponding shape data. Then, the traffic jam information 25 generated in a section of a predetermined distance starting from the vicinity of the branch portion of the reference point P1 is transmitted as transmission target information.

  At this time, as shown in FIG. 7A, in the transmission-side device 100, the shape data generation unit 105 acquires transmission target information and map data from the transmission target information database 103 and the digital map database 101, respectively, and transmits them. The shape data of the corresponding target road section is generated according to the position of the corresponding point of the transmission target information to be transmitted (step S11). Then, the attribute information setting unit 106 searches and extracts whether or not there is a reference point whose front and rear position can be corrected in the target road section (step S12). Subsequently, the node attribute of the extracted reference point is added as attribute information of the shape data, and position reference information including these shape data and attribute information is generated (step S13). Thereafter, the position reference information and the transmission target information are transmitted to the receiving-side apparatus 200.

  In the receiving side device 200, as shown in FIG. 6B, the roads 31 and 32 corresponding to the roads 21 and 22 in the transmitting side device 100 are represented by the map data in the digital map database 207. When the position reference information and the transmission target information are received, the map matching process is performed based on the position reference information, and the target road section corresponding to the shape data is specified. In this case, if only map matching is performed, the position of the reference point P1 having the node attribute of the branch portion is directly associated with the position of the branch portion where the road 31 and the road 32 on the map are connected. Therefore, referring to the attribute information of the shape data, the node of the reference point P1 for which the node attribute of the branching part is set is extracted, and the position of the reference point P1 is determined as the branching part of the roads 31 and 32 in the receiving side device 200. The position is corrected by moving to the position. Then, using the reference point P1 as a reference point, the position of the traffic jam information 35 is moved and displayed according to the position correction amount of the reference point P1.

  At this time, as shown in FIG. 7B, in the receiving-side apparatus 200, the map matching unit 205 obtains the position reference information and the map data from the position reference information storage unit 203 and the digital map database 207, respectively. A target road section is specified by performing matching processing (step S21). Then, the position correction unit 209 refers to the node attribute in the shape data subjected to the map matching, and if the attribute information such as the branching unit is set as the reference point, the corresponding node after the matching is specified (step S22). Subsequently, the front and rear positions of the identified reference point node are corrected according to the map data of the own device (step S23). After that, based on the corrected position information, transmission target information such as traffic jam information is displayed.

  Note that the transmission target information such as traffic jam information transmitted from the transmission side device may be expressed by a relative position from the reference point. In this case, the receiving apparatus can directly associate the position of the transmission target information on the road or along the road with the node of the reference point in the shape data, or reproduce the position of the transmission target information by the relative position from the reference point. That's fine. Further, the position of the transmission target information may be expressed by the relative position from the reference points on both sides, that is, the ratio of the relative distance, using two reference points before and after this position, and may be reproduced by the receiving side device. Further, in the receiving-side apparatus, the front-rear position of each node in the shape data may be corrected based on the shift amount of the front-rear position of the node specified by map matching.

  As described above, in the first embodiment, a node attribute is set by using a specific node corresponding to an intersection or a branching portion in the shape data as a reference point for front and rear position correction, and attribute information indicating the intersection or the branching portion is set. In addition, the position of this reference point is corrected after the map matching of the shape data on the receiving side. Then, the corresponding position of the transmission target information is corrected in accordance with the corrected position of the reference point. As a result, in the location information providing system, when transmitting transmission object information such as traffic information such as traffic jams and accidents, and POI information such as parking lots and facilities, different digital map databases are used on the transmission side and the reception side. Even if it is used, it is possible to eliminate the positional shift of the transmission target information on the receiving side, and to transmit the positional information of the specific point accurately. In particular, when there are multiple intersections in a narrow area such as in an urban area, or when there is a branch section where the road connects at a shallow angle such as an interchange section, the position of the information to be transmitted may change back and forth at the intersection or branch section. Can be prevented.

(Second Embodiment)
FIG. 8 is a diagram showing an example of the data configuration of the position reference information according to the second embodiment of the present invention. The second embodiment is an example in which, when setting attribute information with a specific node of shape data as a reference point, a road attribute of an intersection road is added when the specific node is an intersection.

  The position reference information of the second embodiment shown in FIG. 8 shows an attribute information part corresponding to shape data, and has a shape data number (1 to N in this example) corresponding to the header, In the shape data of each number, when the target node number, the node attribute, and the node attribute are intersections with an intersection road attribute, they have an intersection road attribute. As this intersection road attribute, a road attribute related to the other party's road that intersects at the intersection is set. The road attributes include road types such as national roads and prefectural roads, road names, road widths, and the like. The intersection road attribute is added only when there is another intersection or branch within a few hundred meters before and after the intersection used as a reference point by setting the node attribute.

  Next, the operation of the position reference information generation process in the transmission side apparatus in the second embodiment will be described. FIG. 9 is a flowchart showing a procedure of position reference information generation processing in the transmission side apparatus. In the transmission side device 100, the shape data generation unit 105 acquires transmission target information and map data from the transmission target information database 103 and the digital map database 101, respectively, and corresponds according to the position of the corresponding point of the transmission target information to be transmitted. The shape data of the target road section to be generated is generated (step S31). Then, the attribute information setting unit 106 searches the target road section for an intersection or branch suitable for front-rear position correction, and if it exists, sets this intersection or branch as a reference point (step S32). ). Subsequently, it is determined whether or not an intersection or a branching portion exists within a predetermined range around the set reference point (step S33).

  In step S33, when there is an intersection or a branching portion around the reference point, the intersection road attribute is added to the node attribute of the reference point, and the attribute information of the shape data is obtained (step S34). On the other hand, if there is no intersection or branching portion around the reference point, only the node attribute of the reference point is added as the attribute information of the shape data as in the first embodiment (step S35). Thereby, position reference information including shape data and attribute information of the target road section is generated. Thereafter, the position reference information and the transmission target information are transmitted to the receiving-side apparatus 200.

  As described above, in the second embodiment, when a node attribute is set by using a specific node corresponding to an intersection or a branching portion in the shape data as a reference point for front and rear position correction, the road attribute of the intersection road is further added. By doing so, erroneous recognition of the reference point on the receiving side can be prevented. Thereby, the position correction of the reference point and the transmission target information can be performed more accurately. In particular, the intersection road attribute is effective in a place where narrow streets are dense in an urban area.

  In the first and second embodiments, it is preferable that the position correction reference points are set only at intersections where the road type is equal to or higher than a certain level, such as higher than main local roads or higher than general prefectural roads. . In this case, the amount of position reference information can be minimized, and the amount of transmission data can be reduced. Further, as in the above embodiment, in addition to setting attribute information using an intersection or a branch as a reference point, or providing attribute information of an intersection road of this reference point, this reference point is used as a feature node, It is also possible to add branch shape data representing a shape of a part of the side road to the shape data. By adding such branch shape data, the accuracy of the map matching process can be improved.

  In addition, although the position reference system using shape data and map matching was explained here as an example, a pre-coding system using a VICS link or the like, or two intersections (or points on a road) are specified and then between them Any position reference method that can identify a road section, such as a method that identifies a road section with the shortest route, can be applied to other position reference methods.

  The present invention has the effect that even when different map databases are used on the transmission side and the reception side, it is possible to accurately transmit the position information of a specific point so as not to cause a position shift, The present invention is useful for a position information transmission apparatus and method for transmitting position information generated based on map data stored in a map database.

The block diagram which shows the structure of the principal part of the positional information provision system which concerns on embodiment of this invention. Diagram showing examples of map display using different types of digital map databases The figure which shows the 1st example of the data structure of the position reference information in the 1st Embodiment of this invention. The figure which shows the 2nd example of the data structure of the position reference information in the 1st Embodiment of this invention. The figure which shows an example of the data structure of the transmission object information in the 1st Embodiment of this invention. Explanatory drawing which showed typically the procedure of the position correction process in this embodiment The flowchart which shows the procedure of the position correction process in the transmission side apparatus and reception side apparatus of 1st Embodiment. The figure which shows an example of the data structure of the position reference information in the 2nd Embodiment of this invention. The flowchart which shows the procedure of the position reference information generation process in the transmission side apparatus of 2nd Embodiment. Diagram explaining shape data Explanatory diagram showing the relationship between shape data and event information such as accidents and traffic jams Explanatory drawing showing a display example of event occurrence points when using different map databases

Explanation of symbols

100 Transmitting device (encoder)
101 Digital map database A
103 transmission target information database 105 shape data generation unit 106 attribute information setting unit 107 position reference information storage unit 109 data transmission unit 200 receiving side device (decoder)
201 Data Receiving Unit 203 Location Reference Information Storage Unit 205 Map Matching Unit 207 Digital Map Database B
209 Position correction unit 211 Display unit P1 Reference point

Claims (14)

A position information transmission device for transmitting position information generated based on map data stored in a map database,
Using the position reference data representing the target road section corresponding to the transmission target information generated based on the map data of the first map database, a specific point where the front and rear positions on the road in the position reference data can be specified A position information transmission device comprising an encoder that has attribute information setting means for setting attribute information regarding a specific point as a reference point for position correction, and generates position reference information including the position reference data and the attribute information. The position information transmission device according to claim 1,
A position information transmission device comprising position reference data generation means for generating position reference data representing a target road section corresponding to transmission target information based on map data of the first map database. The position information transmission device according to claim 1,
A position information transmission apparatus comprising: a transmission unit configured to transmit position reference information including the position reference data and the attribute information and the transmission target information. A position information transmission device for transmitting position information generated based on map data stored in a map database,
The position matching data generated based on the map data of the first map database and representing the target road section corresponding to the transmission target information and the map data of the second map database are used to perform the first matching by map matching processing. Map matching means for specifying the target road section in the map database of 2;
Position correction means for correcting the front and rear positions of the reference point on the road when the attribute information corresponds to a reference point for position correction based on the attribute information set at a specific point of the position reference data; ,
A position information transmission apparatus comprising a decoder that analyzes position reference information including the position reference data and the attribute information. The position information transmission device according to claim 4,
A position information transmitting apparatus comprising receiving means for receiving position reference information including the position reference data and the attribute information and the transmission target information. The position information transmission device according to claim 4,
The position correction means is a position information transmission device for correcting the position of transmission target information corresponding to position reference data including the reference point in accordance with the position correction of the reference point. The position information transmission device according to claim 6,
A position information transmitting apparatus comprising information using means for using the position-corrected transmission target information in association with a map in the second map database. The position information transmission device according to claim 7,
As the information utilization means, at least one of display means for displaying the transmission target information on a screen, route calculation means for calculating a route based on the transmission target information, and voice guidance means for performing voice guidance based on the transmission target information A position information transmission device having one of these.   5. The position information transmission device according to claim 1, wherein the position reference data includes shape data including a plurality of nodes representing a shape of the target road section, and the specific point is the shape. A position information transmission device that is a specific node in data.   5. The position information transmission device according to claim 1 or 4, wherein the attribute information includes an intersection, a branching portion, a curved portion having a predetermined angle or more, a railroad crossing, a tunnel end, a bridge end, and an intersection with the administrative community. A position information transmission device including any of the above. A position information transmission method for transmitting position information generated based on map data stored in a map database,
Using the position reference data representing the target road section corresponding to the transmission target information generated based on the map data of the first map database, a specific point where the front and rear positions on the road in the position reference data can be specified A step of setting attribute information regarding the specific point as a reference point for position correction;
Transmitting position reference information including the position reference data and the attribute information;
A position information transmission method comprising: A position information transmission method for transmitting position information generated based on map data stored in a map database,
Position reference information including position reference data representing a target road section corresponding to transmission target information and attribute information set at a specific point of the position reference data, generated based on map data of the first map database Receiving the step,
Identifying the target road section in the second map database by map matching using the position reference data and the map data of the second map database;
Correcting the front and rear positions of the reference point on the road when the attribute information corresponds to a reference point for position correction;
A position information transmission method comprising:   The program for making a computer implement | achieve the function of each means in the positional information transmission apparatus in any one of Claims 1-10.   The program for making a computer perform each procedure in the positional information transmission method of Claim 11 or 12.

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