JP6237215B2 - Location information converter - Google Patents

Description

  The present invention relates to a position information conversion apparatus.

Conventionally, as a position information conversion device, for example, there is a conventional technique described in Patent Document 1.
In the prior art described in Patent Document 1, a plurality of positions representing positions on a first map (for example, an accurate map) and positions on a second map (for example, an inaccurate map) associated with the position. Is stored in the storage unit in advance. Then, three points are set on the first map based on the position on the first map near the current location. At that time, the three points on the first map are set so that the interior angles of the triangles having the three points as vertices are all 30 degrees or more and 120 degrees or less. Subsequently, based on the set positions of the three points on the first map, referring to the information stored in the storage unit, three points are set on the second map corresponding to the three points on the first map. . Subsequently, a position on the second map corresponding to the current location is calculated based on the set positions of the three points on the second map. Thereby, the position on the first map of the current location can be appropriately converted by the position on the second map, that is, the position on the incorrect map.

JP 2011-43788 A

As described above, in the prior art described in Patent Document 1, the three points on the first map are set so that the interior angles of the triangles having the three points as vertices are all 30 degrees or more and 120 degrees or less. ing. However, in the prior art described in Patent Document 1, there is a possibility that the set three points deviate from the current location. Therefore, in the above-described conventional technology, there is a possibility that the position on the first map cannot be appropriately converted to the position on the second map.
An object of the present invention is to make it possible to appropriately convert the position on the first map by the position on the second map, paying attention to the above points.

  In order to solve the above problem, in one embodiment of the present invention, position information representing a position on the first map is acquired. Subsequently, based on the acquired position information and the first map, the first road having the shortest distance from the position on the first map represented by the position information from among the plurality of first road sections on the first map. The shortest interval that is an interval is detected. Subsequently, a ratio between the distance between the position on the first map represented by the position information and the shortest section and the length of the shortest section is calculated based on the first map. Subsequently, based on the second map, a corresponding section that is a second road section on the second map associated with the shortest section is detected. Subsequently, based on the calculated ratio and the detected corresponding section, the first position information represents the position on the second map that is separated from the corresponding section by the distance represented by the multiplication result of the length of the corresponding section and the ratio. The conversion position is a position on the second map corresponding to the position on the map.

  According to one aspect of the present invention, when the position on the first map represented by the position information is converted to the position on the second map, from the position on the first map represented by the position information to the shortest section on the first map. Between the distance between and the length of the shortest section (hereinafter also referred to as “first ratio”) and the conversion position on the second map corresponding to the position to the corresponding section on the second map Since the ratio between the distance and the length of the corresponding section (hereinafter also referred to as “second ratio”) is considered to be approximately the same, the multiplication result of the first ratio and the length of the corresponding section is calculated from the corresponding section. The positions on the second map that are separated by the distance to be represented are the converted positions that are positions on the second map corresponding to the positions on the first map represented by the position information. Thereby, the position on the first map can be appropriately converted by the position on the second map.

It is a block diagram showing vehicle A carrying a position information converter concerning a 1st embodiment. It is a block diagram showing the route guidance apparatus. 3 is a block diagram illustrating a configuration of a position information conversion unit 7. FIG. It is explanatory drawing explaining operation | movement of the target line segment parameter detection part 7a. It is explanatory drawing for demonstrating the modification of the calculation method of the shortest area. It is explanatory drawing for demonstrating operation | movement of the coordinate transformation part 7b. It is a block diagram showing the structure of the route guidance apparatus 5 which concerns on 2nd Embodiment. It is a block diagram of the parameter calculation part 7c. It is explanatory drawing for demonstrating operation | movement of all the section parameter calculation process part 7ca. It is a block diagram which shows the structure of the multiple position information conversion part 7d. It is explanatory drawing for demonstrating operation | movement of multiple coordinate conversion part 7db.

An embodiment of a position information conversion apparatus according to the present invention will be described with reference to the drawings.
(First embodiment)
(Constitution)
FIG. 1 is a block diagram showing a vehicle A equipped with a position information conversion device.
As shown in FIG. 1, the vehicle A includes a real map storage device 1, a position information acquisition device 2, an illustration map storage device 3, an illustration map display device 4, and a route guidance device 5. The position information conversion device of the present embodiment includes the real map storage device 1, the position information acquisition device 2, the illustration map storage device 3, the illustration map display device 4, and the route guidance device 5.

  The real map storage device 1 stores a map (hereinafter also referred to as “real map”) that represents buildings, roads, and the like in an actual shape. An actual map includes, for example, information on a plurality of small sections (hereinafter also referred to as “road sections”) set by dividing roads. As the road section, for example, a link (a line segment connecting the nodes) set along the road to express a road traffic network can be employed. One end of the road section is called “starting end” and the other is called “ending end”.

The position information acquisition device 2 acquires position information representing the current position (latitude and longitude) on the real map of the vehicle A. As the position information acquisition device 2, for example, a GPS receiver that detects a current position based on a transmission signal from a GPS (Global Positioning System) satellite can be employed. Then, the position information acquisition device 2 outputs the acquired current position on the real map to the route guidance device 5.
In the present embodiment, the example in which the position information acquisition device 2 acquires position information representing the current position on the actual map of the vehicle A has been shown, but other configurations may be employed. For example, the position information acquisition device 2 may be configured to acquire position information representing an arbitrary point on a real map specified by the user. Further, for example, the position information acquisition device 2 may be configured to acquire position information representing landmark positions on a real map such as a store, a famous place, and a tourist spot extracted from a map or the like.

  The illustration map storage device 3 stores a map (hereinafter also referred to as “illustration map”) representing exaggerated and deformed buildings and roads. The road of the illustration map is divided into a plurality of small sections (road sections). Thereby, the illustration map has information on a plurality of road sections. Each of a plurality of road sections (hereinafter also referred to as “second road section”) on the illustration map is associated with one of a plurality of road sections (hereinafter also referred to as “first road section”) on the actual map. It has been. One of the ends of the second road section is referred to as a “starting end” and the other is referred to as an “ending end”. The starting end of the second road section is associated with the starting end of the first road section that is associated with the second road section.

In accordance with a command from the route guidance device 5, the illustration map display device 4 superimposes the position represented by the position information on the illustration map on the illustration map including the vicinity of the current position of the vehicle A (hereinafter referred to as “positioned illustration map”). Display). The position information on the illustration map includes, for example, information indicating the position on the illustration map corresponding to the position on the real map represented by the position information.
FIG. 2 is a block diagram showing the route guidance device 5.

The route guidance device 5 includes a position information acquisition unit 6, a position information conversion unit 7, and a post-conversion position information presentation unit 8.
The position information acquisition unit 6 acquires the position information output from the position information acquisition device 2. Further, the position information acquisition unit 6 outputs the acquired position information to the position information conversion unit 7 as input position information.
The position information conversion unit 7 is input based on the input position information output from the position information acquisition unit 6, the actual map stored in the actual map storage device 1, and the illustration map stored in the illustration map storage device 3. Information indicating the position on the illustration map corresponding to the position on the real map represented by the position information (position information on the illustration) is calculated. Then, the position information conversion unit 7 outputs information (position information on the illustration) representing the calculated position on the illustration map to the converted position information presentation unit 8.

FIG. 3 is a block diagram illustrating the configuration of the position information conversion unit 7.
Specifically, as shown in FIG. 3, the position information conversion unit 7 includes a target line segment parameter detection unit 7a and a coordinate conversion unit 7b.
FIG. 4 is an explanatory diagram for explaining the operation of the target line segment parameter detection unit 7a.
As shown in FIG. 4A, the target line segment parameter detection unit 7 a is based on the actual map stored in the actual map storage device 1 and the input position information output by the position information acquisition unit 6. The first road section having the shortest distance from the position on the real map represented by the input position information (hereinafter also referred to as “shortest section”) is detected from the plurality of first road sections above. Specifically, the target line segment parameter detection unit 7a selects one first road section (shortest section candidate) from among a plurality of first road sections on the real map. Subsequently, the target line segment parameter detection unit 7a, as shown in FIG. 4B, starts and ends (hereinafter also referred to as “point A”) and end point of the selected first road section (shortest section candidate). A line segment AB (hereinafter referred to as “point B”) connecting the end portions (hereinafter also referred to as “point B”) is rotated by 90 ° clockwise around the point A, and the line segment AB after rotation (hereinafter also referred to as “line segment AD”) Call). Here, the line segment AD satisfies the following expression (1), passes through the point A of the line segment AB, and is orthogonal to the line segment AB.

  Subsequently, the target line segment parameter detection unit 7a is also referred to as a straight line (hereinafter also referred to as “straight line AB”) that passes through points A and B from a position on the real map (hereinafter also referred to as “point T”) represented by the input position information. ) And the position where the perpendicular line and the straight line AB intersect (hereinafter also referred to as “point C”) are calculated. Subsequently, the target line segment parameter detection unit 7a detects the position (hereinafter referred to as “point”) where the perpendicular line drawn from the point T to the straight line passing through the points A and D (hereinafter also referred to as “straight line AD”) and the straight line AD intersect. E "). Subsequently, the target line segment parameter detection unit 7a calculates the ratio s of the length of the line segment AC to the length of the line segment AB and the ratio t of the length of the line segment AE to the length of the line segment AD. Here, the following equation (2) is established for the line segment AT, line segment AB, and line segment AD. Further, the ratio s and the ratio t represent the positional relationship between the point C and the point E with respect to the line segment AB from the following expressions (3) and (4).

  Subsequently, the target line segment parameter detection unit 7a determines whether or not the calculated point C exists on the line segment AB. Specifically, the target line segment parameter detection unit 7a determines whether the ratio s is 0 or more and 1 or less. When the target line segment parameter detection unit 7a determines that the ratio s is greater than or equal to 0 and less than or equal to 1, the target line segment parameter detection unit 7a determines that the point C exists on the line segment AB, and the length of the line segment AE, that is, , The distance between the point T and the line segment AB is calculated. Thereby, the target line segment parameter detection unit 7a calculates the distance between the position on the actual map represented by the input position information and the first road section on the actual map. As a method of calculating the distance between the point T and the line segment AB, for example, there is a method of calculating according to the following equation (5) based on the ratio t and the length of the line segment AD. On the other hand, when determining that the ratio s is less than 0 or greater than 1, the target line segment parameter detection unit 7a determines that the point C does not exist on the line segment AB, and between the point T and the line segment AB. The distance is not calculated.

  Subsequently, the target line segment parameter detection unit 7a determines whether or not there is an unselected first road section among the plurality of first road sections on the real map. When the target line segment parameter detection unit 7a determines that there is an unselected road section, the target line segment parameter detection unit 7a selects one unselected first road section and executes the above flow again. On the other hand, if the target line segment parameter detection unit 7a determines that there is no unselected first road section, that is, all of the plurality of first road sections on the real map have been selected, the point T and the line segment AB The first road section (shortest section) having the shortest distance between the point T and the line segment AB is detected from the first road sections for which the distance between the two is calculated. As a method for calculating the shortest section, for example, among the first road sections in which the distance between the point T and the line segment AB is calculated, the first road section that satisfies the following expressions (6) and (7) is set as the shortest section. There is a way to detect. As a result, the target line segment parameter detection unit 7a drops from the position on the actual map represented by the input position information from among the plurality of first road sections on the actual map based on the actual map and the input position information. The first road section with the shortest perpendicular length (| t · AD |) is detected as the shortest section.

  Subsequently, the target line segment parameter detection unit 7a, based on the real map stored in the real map storage device 1, detects the shortest section (line segment AB) and the position (T on the real map) represented by the input position information. The ratio t between the distance (| t · line segment AD |) and the length of the shortest section (| line segment AB |) is calculated. Subsequently, the target line segment parameter detection unit 7a passes through the base end (point A) of the shortest section (line segment AB) detected based on the real map stored in the real map storage device 1, and the line segment AB. Distance (| s · line segment AB |) and the length of the shortest section (| line segment AB |) between the straight line (straight line AD) orthogonal to the line and the position (T point) on the real map represented by the input position information The ratio s is calculated. Subsequently, the target line segment parameter detection unit 7a, based on the illustration map stored in the illustration map storage device 3, a second road section (hereinafter, “ Also called “corresponding section”). Subsequently, the target line segment parameter detection unit 7a includes a parameter including the calculated ratios s and t (hereinafter, also referred to as “line segment parameter”) and information indicating the detected corresponding section (hereinafter, “line segment detection information”). Is also output to the coordinate conversion unit 7b.

FIG. 5 is an explanatory diagram for explaining a modification of the method for calculating the shortest interval.
If the target line segment parameter detection unit 7a determines that a vertical line cannot be drawn from any position on the real map represented by the input position information to any of the plurality of first road sections on the real map, FIG. As shown, the distance between the position on the real map represented by the input position information and one end of the first road section among the plurality of first road sections on the real map, and the input position information represent It is good also as a structure which detects the 1st road section where the shorter one is the shortest among the distance between the position on a real map and the other edge part of a 1st road section as the shortest section. In this case, as a method for calculating the shortest section, for example, a first road section that satisfies the following equation (8) is detected as the shortest section.

  When the target line segment parameter detection unit 7a determines that a perpendicular cannot be drawn from any of the plurality of first road sections on the first map from the position on the first map represented by the input position information. Detecting, from among a plurality of straight lines extending from each of the plurality of first road sections on the first map, a straight line having the shortest perpendicular line drawn from the position on the first map represented by the position information, The first road section that is the basis of the straight line may be detected as the shortest section.

FIG. 6 is an explanatory diagram for explaining the operation of the coordinate conversion unit 7b.
Based on the line segment parameters (ratio s, t) and the line segment detection information (corresponding section) output from the target line segment parameter detecting unit 7a, the coordinate conversion unit 7b determines from the corresponding section the length and ratio s of the corresponding section. A position on the second map separated by a distance represented by the multiplication result with t is a position on the illustration map (hereinafter also referred to as “conversion position”) corresponding to the position on the real map represented by the input position information. Specifically, the coordinate conversion unit 7b selects a corresponding section represented by the line segment detection information from a plurality of second road sections on the illustration map. Subsequently, as illustrated in FIG. 6A, the coordinate conversion unit 7 b performs the start end portion (hereinafter, also referred to as “point A ′”) and the end point end (hereinafter, “point B ′”) of the selected corresponding section. Line segment A′B ′ (hereinafter also called “line segment A′D ′”) when the line segment A′B ′ is rotated 90 ° clockwise around the point A ′. (Also called). Here, the line segment A′D ′ satisfies the following expression (9), passes through the point A ′ of the line segment A′B ′, and is orthogonal to the line segment A′B ′.

  Subsequently, the coordinate conversion unit 7b uses the calculated line segment A′D ′, line segment A′B ′, and the ratios s and t included in the line segment parameters to represent the actual position information represented by the input position information according to the following equation (10). The position on the map, that is, the position on the illustration map corresponding to the point T in FIG. 4B (hereinafter also referred to as “point T ′”) is calculated. Subsequently, as shown in FIG. 6B, the coordinate conversion unit 7 b outputs the calculated position (conversion position) of the point T ′ to the post-conversion position information presenting unit 8 as position information on the illustration map.

  The post-conversion position information presentation unit 8 illustrates a command to display the position-illustrated illustration map based on the illustration map position information output by the position information conversion unit 7 and the illustration map stored in the illustration map storage device 3. Output to the map display device 4. Thus, when the command is output, the illustration map display device 4 displays an illustration map with position (an image in which the position represented by the position information on the illustration map is superimposed on the illustration map including the vicinity of the current position of the vehicle A). To do.

(Operation other)
Next, the operation of the vehicle A equipped with the position information conversion device of this embodiment will be described.
First, the route guidance device 5 (position information acquisition unit 6) acquires the position information (position information indicating the current position of the vehicle A) output by the position information acquisition device 2, as shown in FIG. Subsequently, the route guidance device 5 (target line segment parameter detection unit 7a) performs the actual map based on the acquired position information (input position information) of the vehicle A and the actual map stored in the actual map storage device 1. The first road section (shortest section) having the shortest distance from the position on the real map represented by the input position information is detected from the plurality of first road sections above. Subsequently, the route guidance device 5 (target line segment parameter detection unit 7a), based on the actual map stored in the actual map storage device 1, has the shortest position (T point) on the actual map represented by the input position information. A ratio t between the distance (| t · line segment AD |) between the section (line segment AB) and the length of the shortest section (| line segment AB |) is calculated. Further, the route guidance device 5 (target line segment parameter detection unit 7a), based on the actual map stored in the actual map storage device 1, represents the position (T point) on the actual map represented by the input position information and the shortest interval. The distance (| s · line segment AB |) and the length (| line segment) between the straight line (straight line AD) passing through the base end (point A) of (line segment AB) and orthogonal to the line segment AB A ratio s with AB |) is calculated. Subsequently, the route guidance device 5 (target line segment parameter detection unit 7a) performs the second operation on the illustration map associated with the shortest interval detected based on the illustration map stored in the illustration map storage device 3. A road section (corresponding section) is detected.

  Subsequently, the route guidance device 5 (coordinate conversion unit 7b) responds from the corresponding section based on the information (line segment detection information) indicating the detected corresponding section and the calculated ratios s and t (line segment parameters). A position on the illustration map corresponding to a position on the real map represented by the input position information, with a position on the second map separated by a distance represented by the multiplication result of the length of the section and the ratios s and t (position information on the illustration) And Subsequently, the route guidance device 5 (post-conversion location information presentation unit 8) converts the illustration map with location into an illustration map based on the detected location information on the illustration map and the illustration map stored in the illustration map storage device 3. A command to be displayed on the display device 4 is output to the illustration map display device 4. Thereby, the illustration map display device 4 superimposes the position on the illustration map represented by the position information on the illustration map on the illustration map including the current position of the vehicle A and its peripheral portion in accordance with a command from the route guidance device 5. (Illustration map with position) is displayed. Therefore, in the present embodiment, the position on the actual map can be appropriately converted according to the position on the illustration map.

  In the present embodiment, the real map stores the first map. Similarly, the real map storage device 1 of FIG. 1 constitutes a first map storage unit. Further, the route guidance device 5 in FIG. 1 and the position information acquisition unit 6 in FIG. 2 constitute a position information acquisition unit. Furthermore, the route guidance device 5 in FIG. 1 and the position information conversion unit 7 in FIG. 2 constitute a shortest interval detection unit, a distance ratio calculation unit, a corresponding interval detection unit, and a conversion position calculation unit. Moreover, the illustration map storage apparatus 3 of FIG. 1 comprises a 2nd map storage part.

(Effect of this embodiment)
This embodiment has the following effects.
(1) The route guidance device 5 acquires position information representing a position on a real map. Subsequently, the route guidance device 5 has the shortest distance from the position on the actual map represented by the position information from among the plurality of first road sections on the actual map based on the acquired position information and the actual map. The first road section (shortest section) is detected. Subsequently, the route guidance device 5 calculates a ratio t between the distance between the position on the real map represented by the position information and the shortest section and the length of the shortest section based on the real map. Subsequently, the route guidance device 5 detects a corresponding section which is the second road section on the illustration map associated with the shortest section based on the illustration map. Subsequently, the route guidance device 5 determines the position on the second map that is separated from the corresponding section by the multiplication result of the length of the corresponding section and the ratio based on the calculated ratio t and the detected corresponding section. The position on the illustration map corresponding to the position on the real map represented by the position information (position information on the illustration, converted position) is calculated.

  According to such a configuration, when converting the position on the real map represented by the position information to the position on the illustration map, the distance between the position on the real map represented by the position information and the shortest section on the real map The ratio between the length of the shortest section (hereinafter also referred to as “first ratio”), the distance from the conversion position on the illustration map corresponding to the position to the corresponding section on the illustration map, and the length of the corresponding section The ratio of the ratio (hereinafter also referred to as “second ratio”) is considered to be approximately the same, so that the illustration map is separated from the corresponding section by the distance represented by the multiplication result of the first ratio and the length of the corresponding section. The upper position is set as a conversion position that is a position on the illustration map corresponding to the position on the real map represented by the position information. Thereby, the position on the actual map can be appropriately converted by the position on the illustration map.

(2) The route guidance device 5 is based on the actual map and the input position information, and the length of the perpendicular drawn from the position on the actual map represented by the input position information from among the plurality of first road sections on the actual map. The first road section having the shortest length is detected as the shortest section.
According to such a configuration, the first road section closest to the position represented by the input position information can be detected as the shortest section. Therefore, the shortest interval can be detected more appropriately.

(3) When it is determined that the route guidance device 5 cannot make a perpendicular to any of the plurality of first road sections on the actual map from the position on the actual map represented by the input position information, Among the plurality of first road sections, the distance between the position on the real map represented by the input position information and one end of the first road section, and the position on the real map represented by the input position information and the first The first road section having the shortest distance among the distances from the other end of the road section is detected as the shortest section.
According to such a configuration, even when a perpendicular cannot be drawn from the position on the real map represented by the position information to the first road section on the real map, the shortest section can be detected more appropriately.

(4) When it is determined that the route guidance device 5 cannot make a perpendicular to any of the plurality of first road sections on the first map from the position on the first map represented by the input position information, A straight line having a shortest perpendicular line from the position on the first map represented by the position information is detected from a plurality of straight lines extending from the plurality of first road sections on one map. It is good also as a structure which detects the 1st road area used as the basis as the shortest section.
According to such a configuration, even when a perpendicular cannot be drawn from the position on the real map represented by the position information to the first road section on the real map, the shortest section can be detected more appropriately.

(Second Embodiment)
Next, a second embodiment according to the present invention will be described with reference to the drawings. In addition, about the structure similar to the said embodiment, the same code | symbol is used and the detail is abbreviate | omitted.
In this embodiment, when it is determined that the distance between the position on the real map represented by the input position information and the shortest section is equal to or greater than the set distance, at least two or more first road sections are used instead of the shortest section. This is different from the first embodiment in that the position information (converted position) on the illustration is calculated using.
Specifically, the present embodiment differs from the first embodiment in the configuration of the position information conversion unit 7.
Each of the plurality of first road sections on the real map is set with a unique road section number. Each of the plurality of second road sections on the illustration map is set with a road section number set for the first road section associated with the second road section.

FIG. 7 is a block diagram illustrating the configuration of the route guidance device 5.
As illustrated in FIG. 7, the position information conversion unit 7 includes a coordinate conversion unit 7b, a parameter calculation unit 7c, and a multiple position information conversion unit 7d.
FIG. 8 is a block diagram of the parameter calculation unit 7c.
As shown in FIG. 8, the parameter calculation unit 7c includes an all-section parameter calculation processing unit 7ca, a singular parameter calculation unit 7cb, and a multiple parameter calculation unit 7cc.

FIG. 9 is an explanatory diagram for explaining the operation of the all-section parameter calculation processing unit 7ca.
The all section parameter calculation processing unit 7ca is based on the actual map stored in the actual map storage device 1 and the input position information output by the position information acquisition unit 6, and includes all section parameters (described later) and shortest section information (described later). ) Is calculated. Specifically, as shown in FIG. 9A, the all section parameter calculation processing unit 7ca selects one road section number from among the road section numbers set for each of the plurality of first road sections on the real map. Select i (i = 1, 2,...). Subsequently, as shown in FIG. 9B, the all-section parameter calculation processing unit 7ca, as shown in FIG. 9B, is the starting end of the first road section where the selected road section number i is set (hereinafter also referred to as “point Ai”). And a line segment AiBi (hereinafter referred to as “line segment AiDi”) when the line segment AiBi connecting the end point and the end point (hereinafter also referred to as “point Bi”) is rotated 90 ° clockwise around the point Ai. Is also calculated). Here, the line segment AiDi satisfies the following expression (11), passes through the point Ai of the line segment AiBi, and is orthogonal to the line segment AiBi.

  Subsequently, the all-section parameter calculation processing unit 7ca calls a straight line (hereinafter also referred to as “straight line AiBi”) that passes through the point Ai and the point Bi from the position on the real map (hereinafter also referred to as “point T”) represented by the input position information. ) And the position where the perpendicular line and the straight line AiBi intersect (hereinafter also referred to as “point Ci”) are calculated. Subsequently, the all-section parameter calculation processing unit 7ca has a position (hereinafter referred to as “point”) where a perpendicular line drawn from a point T to a straight line passing through the point Ai and the point Di (hereinafter also referred to as “straight line AiDi”) and the straight line AiDi. Ei)). Subsequently, the all-section parameter calculation processing unit 7ca calculates the ratio si of the length of the line segment AiCi to the length of the line segment AiBi, and the ratio ti of the length of the line segment AiEi to the length of the line segment AiDi. Here, the relationship of the following equation (12) is established for the line segment AiT, the line segment AiBi, and the line segment AiDi. Further, the ratio si and the ratio ti represent the positional relationship between the point Ci and the point Ei with respect to the line segment AiBi from the following equations (13) and (14).

  Subsequently, the all-section parameter calculation processing unit 7ca determines whether or not the calculated point Ci exists on the line segment AiBi. Specifically, the all interval parameter calculation processing unit 7ca determines whether the ratio si is 0 or more and 1 or less. When determining that the ratio si is 0 or more and 1 or less, the all-section parameter calculation processing unit 7ca determines that the point Ci exists on the line segment AiBi, and the length of the line segment AiEi, that is, , The distance between the point T and the line segment AiBi is calculated. Thereby, the all section parameter calculation processing unit 7ca calculates the distance between the position on the actual map represented by the input position information and the first road section on the actual map. As a method for calculating the distance between the point T and the line segment AiBi, for example, there is a method of calculating according to the following equation (15) based on the ratio ti and the length of the line segment AiDi. On the other hand, if it is determined that the ratio si is less than 0 or greater than 1, the all-section parameter calculation processing unit 7ca determines that the point Ci does not exist on the line segment AiBi, and between the point T and the line segment AiBi. The distance is not calculated.

  Subsequently, the all-section parameter calculation processing unit 7ca determines whether or not there is an unselected road section number among the set road section numbers. Then, if it is determined that there is an unselected road section number, the all section parameter calculation processing unit 7ca selects one unselected road section number and executes the above flow again. On the other hand, if it is determined that there is no unselected road section number, that is, all the set road section numbers have been selected, the all section parameter calculation processing unit 7ca selects from the plurality of first sections on the real map. The first road section (hereinafter also referred to as “shortest section candidate”) in which the distance between the point T and the line segment AiBi is calculated is detected.

  Subsequently, the all section parameter calculation processing unit 7ca, based on the actual map stored in the actual map storage device 1, detects the shortest section candidate (line segment AiBi) and the position on the actual map represented by the input position information ( The ratio ti between the distance (| ti · line segment AiDi |) and the length of the shortest section candidate (| line segment AiBi |) is calculated. Subsequently, the all section parameter calculation processing unit 7ca passes through the base end (point Ai) of the shortest section candidate (line segment AiBi) detected based on the actual map stored in the actual map storage device 1. The distance (| si · line segment AiBi |) between the straight line orthogonal to AiBi (straight line AiDi) and the position (T point) on the real map represented by the input position information and the length of the shortest section candidate (| line segment AiBi) The ratio si with |) is calculated. Subsequently, the all section parameter calculation processing unit 7ca, based on the illustration map stored in the illustration map storage device 3, a second road section on the illustration map (hereinafter, referred to as the shortest section candidate detected). (Also referred to as “corresponding section candidate”). Subsequently, the all-section parameter calculation processing unit 7ca sends the calculated ratios si and ti and the parameters including the corresponding section candidates (hereinafter also referred to as “all-section parameters”) to the singular parameter calculation unit 7cb and the multiple parameter calculation unit 7cc. Output.

  Subsequently, the all section parameter calculation processing unit 7ca detects the shortest section candidate (shortest section) having the shortest distance between the point T and the line segment AiBi from the detected shortest section candidates. As a method for calculating the shortest section, for example, among the detected shortest section candidates, there is a method of detecting the shortest section candidate satisfying the following equations (16) and (17) as the shortest section. As a result, the all-section parameter calculation processing unit 7ca deducts from the position on the actual map represented by the input position information from among the plurality of first road sections on the actual map based on the actual map and the input position information. The first road section having the shortest perpendicular line length (| ti · AiDi |) is detected as the shortest section.

  Note that if the all-section parameter calculation processing unit 7ca determines that a vertical line cannot be drawn to any of the plurality of first road sections on the actual map from the position on the actual map represented by the input position information, FIG. As shown, the distance between the position on the real map represented by the input position information and one end of the first road section among the plurality of first road sections on the real map, and the input position information represent It is good also as a structure which detects the 1st road section where the shorter one is the shortest among the distance between the position on a real map and the other edge part of a 1st road section as the shortest section. In this case, as a method for calculating the shortest section, for example, the first road section that satisfies the following equations (18) and (19) is detected as the shortest section.

  Further, when the all-section parameter calculation processing unit 7ca determines that a perpendicular cannot be drawn from any of the plurality of first road sections on the first map from the position on the first map represented by the input position information. Detecting, from among a plurality of straight lines extending from each of the plurality of first road sections on the first map, a straight line having the shortest perpendicular line drawn from the position on the first map represented by the position information, The first road section that is the basis of the straight line may be detected as the shortest section.

  Subsequently, the all-section parameter calculation processing unit 7ca, based on the actual map stored in the actual map storage device 1, detects the shortest section (line segment AiBi) and the position on the actual map (T The ratio ti between the distance (| ti · line segment AiDi |) and the length of the shortest section (| line segment AiBi |) is calculated. Subsequently, the all section parameter calculation processing unit 7ca passes through the base end (point Ai) of the shortest section (line segment AiBi) detected based on the actual map stored in the actual map storage device 1, and the line segment AiBi. The distance (| si · line segment AiBi |) and the length of the shortest section (| line segment AiBi |) between the straight line (straight line AiDi) perpendicular to the line and the position (T point) on the real map represented by the input position information And the ratio si is calculated. Subsequently, the all-section parameter calculation processing unit 7ca, based on the illustration map stored in the illustration map storage device 3, a second road section (hereinafter, “ Also called “corresponding section”). Subsequently, the entire section parameter calculation processing unit 7ca outputs the calculated ratios si and ti and information indicating the corresponding section (hereinafter also referred to as “shortest section information”) to the singular parameter calculation unit 7cb and the multiple parameter calculation unit 7cc. To do.

  The single parameter calculation unit 7cb is based on the all section parameters and the shortest section information output from the all section parameter calculation processing unit 7ca, and the first road section (shortest distance) from the position on the real map represented by the input position information. (Section) road section number j is detected. Subsequently, the singular parameter calculation unit 7cb determines in advance the distance between the line segment AjEj of the first road section of the detected road section number j, that is, the position on the real map represented by the input position information and the shortest section. It is determined whether it is less than the set distance. As the set distance, for example, the length of the line segment AjBj can be adopted. When the single parameter calculation unit 7cb determines that the line segment AjEj is less than the set distance (the length of the line segment AjBj), the ratio s represented by the shortest link information output by the all-section parameter calculation processing unit 7ca , T (hereinafter also referred to as “line segment parameter”) and information indicating the corresponding section represented by the shortest link information (hereinafter also referred to as “line segment detection information”) are output to the coordinate conversion unit 7b. Thereby, the singular parameter calculation unit 7cb outputs the line segment parameter and the line segment detection information when the position on the real map represented by the input position information and the shortest section are sufficiently close. On the other hand, if the single parameter calculation unit 7cb determines that the line segment AjEj is greater than or equal to the set distance (the length of the line segment AjBj), nothing is output to the coordinate conversion unit 7b.

  The multiple parameter calculation unit 7cc is based on the all section parameters and the shortest section information output by the all section parameter calculation processing unit 7ca, and the first road section (shortest) from the position on the real map represented by the input position information (Section) road section number j is detected. Subsequently, the multiple parameter calculation unit 7cc determines in advance the distance between the detected line segment AjEj of the first road section of the road section number j, that is, the position on the real map represented by the input position information and the shortest section. It is determined whether or not the distance is greater than the set distance. As the set distance, for example, the length of the line segment AjBj can be adopted. If the multiple parameter calculation unit 7cc determines that the line segment AjEj is greater than or equal to the set distance (the length of the line segment AjBj), the multiple parameter calculation unit 7ca outputs all the segment parameters output by the multiple segment calculation unit 7ca before detection. It outputs to the coordinate transformation part 7b as a line segment parameter. Thereby, the singular parameter calculation unit 7cb outputs the pre-detection multiple line segment parameters to the coordinate conversion unit 7b when the position on the real map represented by the input position information and the shortest section are deviated. On the other hand, when it is determined that the line segment AjEj is less than the set distance (the length of the line segment AjBj), the multiple parameter calculation unit 7cc outputs nothing to the multiple position information conversion unit 7d.

FIG. 10 is a block diagram showing a configuration of the multiple position information conversion unit 7d.
As illustrated in FIG. 10, the multiple position information conversion unit 7d includes a multiple target line segment detection unit 7da, a multiple coordinate conversion unit 7db, and a multiple coordinate integration unit 7dc.
The multiple target line segment detection unit 7da is based on the pre-detection multiple line segment parameter (ratio ti) output from the parameter calculation unit 7c and the position (point T) on the real map represented by the input position information according to the following equation (20). A distance li between the shortest section candidate (line segment AiBi) is calculated.

  Subsequently, the multiple target line segment detection unit 7da satisfies the following expression (21) from among the shortest section candidates (first road sections) based on the calculated distance li and the threshold L (for example, a fixed value). At least two first road sections are detected. Thereby, the multiple target line segment detection unit 7da has the first road whose distance from the position on the real map represented by the input position information is shorter than the threshold L (predetermined set distance) among the plurality of first road sections. At least two sections are detected.

  In the present embodiment, the multiple target line segment detection unit 7da determines that the distance from the position (point T) on the real map represented by the input position information is within the threshold L from among the shortest section candidates (first road sections). Although an example in which the shortest section candidate (first road section) is detected is shown, other configurations may be employed. For example, the multiple target line segment detection unit 7da selects the shortest section candidate (first road) having a short distance from the position (point T) on the real map represented by the input position information from among the shortest section candidates (first road section). It is good also as a structure which detects the setting number (for example, two) 1st road area in order from an area.

  Subsequently, the multiple target line segment detection unit 7da, based on the illustration map stored in the illustration map storage device 3, detects a second road section (hereinafter referred to as “second road section”) associated with at least two or more detected first road sections. , Also called “multiple-corresponding section”). Subsequently, the multiple target line segment detection unit 7da, based on the actual map stored in the actual map storage device 1, detects each of at least two or more first road sections and the position on the actual map represented by the input position information. A ratio ti between the distance between (T point) and the length of the first road section is calculated. Subsequently, the multiple target line segment detection unit 7da, based on the actual map stored in the actual map storage device 1, detects the base end (point Ai) of at least two or more first road sections (line segment AiBi) detected. ) And the distance between the straight line (straight line AiDi) orthogonal to the line segment AiBi and the position (T point) on the real map represented by the input position information and the first road section The ratio si to the length (| line segment AiBi |) is calculated. Subsequently, the plurality of target line segment detection unit 7da includes information indicating the detected plurality of corresponding sections (hereinafter, also referred to as “multiple line segment detection information”), and calculated ratios si, ti (hereinafter, “multiple line segment parameters”). Are also output to the multiple coordinate conversion unit 7db.

FIG. 11 is an explanatory diagram for explaining the operation of the multi-coordinate conversion unit 7db.
The multiple coordinate conversion unit 7db is a real map represented by the input position information based on the multiple line segment parameters (ratio si, ti) detected by the multiple target line segment detection unit 7da and the multiple line segment detection information (multiple corresponding sections). At least two positions on the illustration map (hereinafter also referred to as “conversion candidate positions”) corresponding to the upper position (point T) are calculated. Specifically, the multiple coordinate conversion unit 7db selects one multiple corresponding section from among the multiple corresponding sections. Subsequently, as shown in FIG. 11A, the multi-coordinate conversion unit 7db performs a base point end (hereinafter also referred to as “point Ai ′”) and an end point end (hereinafter “point Bi ′”) of the selected plurality of corresponding sections. Line segment Ai′Bi ′ (hereinafter also referred to as “line segment Ai′Di ′”) is rotated 90 ° clockwise around the point Ai ′. Is also calculated). Here, the line segment Ai′Di ′ satisfies the following expression (22), passes through the point Ai ′ of the line segment Ai′Bi ′, and is orthogonal to the line segment Ai′Bi ′.

  Subsequently, the multi-coordinate conversion unit 7db receives the input position information according to the following equation (23) based on the calculated line segment Ai′Di ′, the line segment Ai′Bi ′, and the ratios si and ti included in the multi-line segment parameters. The position on the real map to be expressed, that is, the position on the illustration map corresponding to the point T in FIG. 9B (conversion candidate position; hereinafter also referred to as point Ti ′) is calculated. Subsequently, the multiple coordinate conversion unit 7db determines whether or not there is an unselected multiple corresponding section among the multiple corresponding sections represented by the multiple line segment detection information. If the multi-coordinate conversion unit 7db determines that there is an unselected multiple corresponding section, the multi-coordinate conversion unit 7db selects one unselected multiple corresponding section and executes the above flow again. On the other hand, when the multi-coordinate conversion unit 7db determines that there is no unselected multi-corresponding section, that is, all the multi-corresponding sections are selected, as shown in FIG. 10B, the calculated point Ti ′ ( Information indicating the conversion candidate position (hereinafter also referred to as “multiple coordinate conversion information”) is output to the multiple coordinate integration unit 7dc. Thereby, the multi-coordinate conversion unit 7db calculates at least two positions on the illustration map (conversion candidate positions, point T ′) corresponding to the position (point T) on the real map represented by the input position information.

  The multi-coordinate integration unit 7dc calculates one representative position from at least two or more points Ti ′ (conversion candidate positions) represented by the multi-coordinate conversion information, based on the multi-coordinate conversion information output from the multi-coordinate conversion unit 7db. As a representative position calculation method, for example, there is a method of calculating the center of gravity of the positions of a plurality of points Ti ′. Further, for example, there is a method of calculating a position that is equidistant or substantially equidistant from the positions of the plurality of points Ti ′. Then, the multi-coordinate integrating unit 7dc outputs the integrated coordinates (hereinafter also referred to as “position information on the illustration”) to the post-conversion position information presenting unit 8.

(Operation other)
Next, the operation of the vehicle A equipped with the position information conversion device of this embodiment will be described.
First, the route guidance device 5 (position information acquisition unit 6 in FIG. 7) acquires the position information (information indicating the current position of the vehicle A) output by the position information acquisition device 2. Subsequently, the route guidance device 5 (all section parameter calculation processing unit 7 ca in FIG. 8) is based on the acquired position information (input position information) of the vehicle A and the actual map stored in the actual map storage device 1. The first road section (shortest section) having the shortest distance from the position on the real map represented by the input position information is detected from the plurality of first road sections on the real map. Subsequently, the route guidance device 5 (all section parameter calculation processing unit 7ca in FIG. 8) sets all section parameters (corresponding section candidates, ratio si, ti) and shortest section information (shortest section, ratio si, ti). . Here, it is assumed that the distance (| AiEi |) between the position (point T) on the real map represented by the input position information and the shortest section is less than the set distance (| line segment AiBi |). Then, the route guidance device 5 (single parameter calculation unit 7cb in FIG. 8) uses the distance between the position on the real map represented by the input position information and the shortest section (| It is determined that the line segment AiEi |) is less than the set distance (| line segment AiBi |), and line segment detection information (corresponding section) and line segment parameters (ratio si, ti) are set.

  Subsequently, the route guidance device 5 (coordinate conversion unit 7b in FIG. 7) determines the corresponding section from the corresponding section based on the set line segment detection information (corresponding section) and the line segment parameters (ratio si, ti). The position on the second map that is separated by the distance represented by the multiplication result of the length and the ratios s and t is the position on the illustration map (position information on the illustration) corresponding to the position on the real map represented by the input position information. . Subsequently, the route guidance device 5 (post-conversion location information presentation unit 8 in FIG. 7) is based on the detected illustration map location information and the illustration map stored in the illustration map storage device 3, and the location-specific illustration map. To the illustration map display device 4 is output to the illustration map display device 4. Thereby, the illustration map display device 4 superimposes the position on the illustration map represented by the position information on the illustration map on the illustration map including the current position of the vehicle A and its peripheral portion in accordance with a command from the route guidance device 5. (Illustration map with position) is displayed. Therefore, when the position on the actual map represented by the input position information and the shortest section on the actual map are sufficiently close, the route guidance device 5 converts the position (point T) on the actual map to the position on the illustration map ( The point T ′) can be appropriately converted.

  On the other hand, it is assumed that the distance (| line segment AiEi |) between the position (point T) on the real map represented by the input position information and the shortest section is equal to or greater than the set distance (| line segment AiBi |). Then, the route guidance device 5 (multiple parameter calculation unit 7cc in FIG. 10) determines the interval between the position (point T) on the real map represented by the input position information and the shortest section based on all the set section parameters and the shortest section information. Is determined to be equal to or greater than the set distance (| line segment AiBi |), and pre-detection multiple line segment parameters (corresponding section candidates, ratios si, ti) are set. Subsequently, the route guidance device 5 (multiple target line segment detection unit 7da in FIG. 10) determines the shortest section candidate (first road section) based on the pre-detection multiple line segment parameters (corresponding section candidates, ratios si, ti). Among these, at least two or more first road sections whose distance from the position on the real map represented by the input position information is shorter than the threshold value L are detected. Subsequently, the route guidance device 5 (multiple target line segment detection unit 7da in FIG. 10) associates with the detected at least two first road sections based on the illustration map stored in the illustration map storage device 3. The second road section (multiple corresponding sections) is detected.

  Subsequently, the route guidance device 5 (multiple target line segment detection unit 7da), based on the real map stored in the real map storage device 1, detects each of at least two or more first road sections and input position information. A ratio ti between the distance between the position (T point) on the real map to be represented and the length of the first road section is calculated. Subsequently, the route guidance device 5 (multiple target line segment detection unit 7da in FIG. 10) detects at least two or more first road sections (line segments) detected based on the actual map stored in the actual map storage device 1. The distance (| si · line segment) between each straight line (straight line AiDi) passing through the base end (point Ai) of AiBi) and orthogonal to the line segment AiBi and the position (T point) on the actual map represented by the input position information A ratio si between AiBi |) and the length of the first road section (| line segment AiBi |) is calculated. Subsequently, the route guidance device 5 (multiple target line segment detection unit 7da in FIG. 10) sets information (multiple line segment detection information) indicating the detected multiple corresponding sections. Further, the route guidance device 5 (multiple target line segment detection unit 7da in FIG. 10) uses the calculated ratios si and ti as multiline segment parameters.

Subsequently, the position (point T) on the actual map represented by the input position information based on the set multi-line segment detection information and the multi-line segment parameter, which is set by the route guidance device 5 (multi-coordinate conversion unit 7db in FIG. 10). At least two positions on the illustration map corresponding to (conversion candidate position. Plural coordinate conversion information. Point Ti ′) are calculated. Subsequently, the route guidance device 5 (multiple coordinate integration unit 7dc in FIG. 10) selects one representative position (position information on illustration, point T) from at least two or more points Ti ′ (conversion candidate positions) represented by the multiple coordinate conversion information. ') Is calculated. Subsequently, the route guidance device 5 (post-conversion position information presentation unit 8 in FIG. 7) is based on the integrated illustration map position (point T ′) and the illustration map stored in the illustration map storage device 3. A command for causing the illustration map display device 4 to display the illustration map with position is output to the illustration map display device 4. Thereby, the illustration map display device 4 superimposes the position on the illustration map represented by the position information on the illustration map on the illustration map including the current position of the vehicle A and its peripheral portion in accordance with a command from the route guidance device 5. (Illustration map with position) is displayed.
In the present embodiment, the parameter calculation unit 7c of FIG. 7 constitutes a multiple road section detection unit, a multiple ratio calculation unit, and a multiple corresponding section detection unit.

(Effect of this embodiment)
This embodiment has the following effects in addition to the effects of the first embodiment (1) and (2).
(1) When it is determined that the distance between the position on the real map represented by the input position information and the shortest section is less than the set distance, the route guidance device 5 based on the ratio t and the corresponding section, The position information on the illustration (conversion position) is calculated. On the other hand, when it is determined that the distance between the position on the real map represented by the input position information and the shortest section is equal to or greater than the set distance, the route guidance device 5 is at least a ratio ti and at least 2 or more. Based on the second road section, position information (converted position) on the illustration is calculated.

According to such a configuration, even when the position on the actual map represented by the position information is far from the shortest section on the actual map, the position on the actual map can be appropriately converted according to the position on the illustration map.
(2) When it is determined that the distance between the position on the real map represented by the input position information and the shortest section is equal to or greater than the set distance, the route guidance device 5 has a ratio ti of at least 2 and at least 2 Based on the second road section described above, at least two or more positions on the second map corresponding to the position on the real map represented by the input position information are calculated. Subsequently, the route guidance device 5 calculates one representative position from the calculated at least two or more positions and uses it as position information on the illustration.
According to such a configuration, at least two or more positions on the second map corresponding to the positions on the actual map are calculated, and one representative position is calculated from the calculated at least two or more positions as a conversion position. Thereby, the position on the actual map can be appropriately converted by the position on the illustration map.

(Modification)
In the above embodiment, the route guidance device 5 converts the position on the real map represented by the input position information into the position on the illustration map, and displays an image in which the converted position is superimposed on the illustration map. However, other configurations can be employed. For example, the route guidance device 5 may be configured to convert the position on the illustration map to the position on the actual map. Thereby, the route guidance device 5 can bidirectionally convert the position on the actual map and the position on the illustration map.

  For example, the route guidance device 5 can convert a point sequence on the real map into a point sequence on the illustration map by using a plurality of pieces of input position information. Thereby, the route guidance device 5 can display an image in which the travel route and the travel route on the real map are superimposed on the illustration map. The route guidance device 5 can also convert the point sequence on the illustration map into the point sequence on the real map.

1 Real map storage device (first map storage)
5 route guidance device (position information acquisition unit, shortest interval detection unit, distance ratio calculation unit, corresponding interval detection unit, conversion position calculation unit)
6 Location information acquisition unit (location information acquisition unit)
7 position information converter (shortest section detector, distance ratio calculator, corresponding section detector, conversion position calculator)
3 Illustration map storage device 3 (second map storage)
7c Parameter calculation section (multiple road section detection section, multiple ratio calculation section, multiple corresponding section detection section)

Claims (6)

A first map storage unit storing a first map having information on a plurality of first road sections;
A position information acquisition unit for acquiring position information representing a position on the first map;
Based on the first map stored in the first map storage unit and the position information acquired by the position information acquisition unit, the position is selected from a plurality of first road sections on the first map. A shortest section detecting unit for detecting a shortest section that is a first road section having a shortest distance from a position on the first map represented by the information;
Based on the first map stored in the first map storage unit, the position on the first map represented by the position information acquired by the position information acquisition unit and the shortest interval detected by the shortest section detection unit A distance ratio calculation unit that calculates a ratio between the distance between the sections and the length of the shortest section;
A second map storage unit storing a second map having information on a plurality of second road sections associated with each of the plurality of first road sections;
A corresponding section that is a second road section on the second map that is associated with the shortest section detected by the shortest section detection section based on the second map stored in the second map storage section A corresponding section detecting unit for detecting
Based on the ratio calculated by the distance ratio calculator and the corresponding section detected by the corresponding section detector, the distance represented by the multiplication result of the length of the corresponding section and the ratio is separated from the corresponding section. A conversion position calculation unit that sets a position on the second map as a conversion position that is a position on the second map corresponding to the position on the first map represented by the position information acquired by the position information acquisition unit; A position information conversion device comprising: A plurality of road section detecting sections for detecting at least two or more first road sections from among the plurality of first road sections on the first map stored in the first map storage section;
Based on the first map stored in the first map storage unit, the position on the first map represented by the position information acquired by the position information acquisition unit and at least detected by the multiple road section detection unit A multiple ratio calculation unit that calculates a multiple section ratio between the distance between each of the two or more first road sections and the length of the first road section;
Based on the second map stored in the second map storage unit, the second map on the second map associated with at least two or more first road segments detected by the plurality of road segment detection units. A multi-corresponding section detecting unit that detects a plurality of corresponding sections that are road sections,
The conversion position calculation unit
When it is determined that the distance between the position on the first map represented by the position information acquired by the position information acquisition unit and the shortest section detected by the shortest section detection unit is less than a preset set distance Is a distance represented by the multiplication result of the length of the corresponding section and the ratio from the corresponding section based on the ratio calculated by the distance ratio calculating section and the corresponding section detected by the corresponding section detecting section. The position on the second map that is separated from the second map as the conversion position,
When it is determined that the distance between the position on the first map represented by the position information acquired by the position information acquisition unit and the shortest section detected by the shortest section detection unit is greater than or equal to the set distance 2. The position according to claim 1, wherein the conversion position is calculated based on the plurality of section ratios calculated by the plurality of ratio calculation unit and the plurality of corresponding sections detected by the plurality of corresponding section detection units. Information conversion device. The plurality of road section detection units are selected from among the plurality of first road sections based on the first map stored in the first map storage unit and the position information acquired by the position information acquisition unit. Detecting at least two or more first road sections whose distance from the position on the first map represented by the position information is shorter than a predetermined threshold distance;
The conversion position calculation unit is configured such that a distance between the position on the first map represented by the position information acquired by the position information acquisition unit and the shortest section detected by the shortest section detection unit is greater than or equal to the set distance. If it is determined that there is, the position information acquired by the position information acquisition unit based on the plurality of section ratios calculated by the plurality of ratio calculation unit and the plurality of corresponding sections detected by the plurality of corresponding section detection units Calculating at least two or more positions on the second map corresponding to the position on the first map represented by, and calculating one representative position from the calculated at least two or more positions as the converted position. The position information conversion device according to claim 2.   The shortest section detection unit includes a plurality of first roads on the first map based on the first map stored in the first map storage unit and the position information acquired by the position information acquisition unit. 4. The method according to claim 1, wherein a first road section having a shortest perpendicular line from a position on the first map represented by the position information is detected as the shortest section from the sections. The position information conversion device according to claim 1.   When it is determined that the shortest section detection unit cannot make a perpendicular to any of the plurality of first road sections on the first map from the position on the first map represented by the position information, Of the plurality of first road sections on the first map, the distance between the position on the first map represented by the position information and one end of the first road section, and the position information represented by the position information 5. The first road section having the shortest shortest distance between the position on the first map and the other end of the first road section is detected as the shortest section. Position information conversion device.   When it is determined that the shortest section detection unit cannot make a perpendicular to any of the plurality of first road sections on the first map from the position on the first map represented by the position information, From among a plurality of straight lines extending from a plurality of first road sections on the first map, a straight line having a shortest perpendicular line from the position on the first map represented by the position information is detected and detected. The position information conversion device according to claim 4, wherein the first road section that is the basis of the straight line is detected as the shortest section.

Images