JP5399813B2 - Reverse geocoding apparatus and reverse geocoding method - Google Patents

Description

  The present invention relates to a reverse geocoding apparatus and a reverse geocoding method.

  There is known a reverse geocoding method that specifies a point on the ground surface and obtains place name information associated with a mesh including the point on the ground surface (for example, Patent Document 1).

JP 2008-89815 A

  The place name information needs to be associated with all meshes, but there are areas that do not correspond to the original data of the Ministry of Land, Infrastructure, Transport and Tourism, such as mountainous areas and the sea, so place name information is associated. There is not a mesh.

  However, in the invention described in Patent Document 1, it is assumed that place name information is associated with all meshes. For this reason, there is a problem that the place name information cannot be acquired when there is a mesh that is not associated with the place name information.

  Therefore, in view of the above problems, the present invention provides a reverse geocoding device, a reverse geocoding program, and a reverse geocoding that can acquire place name information even when there is mesh information that does not include place name information. The object is to provide a coding method.

  In order to solve the above problems, the reverse geocoding device of the present invention includes position information indicating an area on the ground surface, at least a region name indicating a wide area portion of the area, and a region name indicating a region narrower than the wide area portion. A reverse geocoding device that obtains a corresponding place name corresponding to a target point that is one point on the ground surface using mesh information that includes place name information, and a mesh that corresponds to an area including the target point A target position mesh search unit that searches for target position mesh information that is information, a determination unit that determines whether place name information is included in the target position mesh information searched by the target position mesh search unit, and a determination unit, When it is determined that the location information is not included in the target position mesh information, the location name information is included in the mesh information in the vicinity of the target location mesh information. Measure the measurement distance that is the distance between the target point and the area indicated by the location information included in the proximity mesh information determined by the proximity mesh determination unit and the proximity mesh determination unit that determines that the mesh information is proximity mesh information To acquire the corresponding place name including the area name determined according to the measured distance measured by the distance measuring part among the multiple area names that make up the place name information included in the proximity mesh information A section.

  In the reverse geocoding device of the present invention, when the place name information is not included in the mesh information, the corresponding place name is obtained based on the place name information included in the neighboring mesh information. Therefore, it is possible to obtain the corresponding place name even when the place information is not included in the mesh information.

  In the reverse geocoding device of the present invention, the corresponding place name included in the mesh information is acquired according to the distance between the target point and the area indicated by the position information included in the mesh information. For this reason, it is possible to suppress acquisition of an incorrect corresponding place name.

  Furthermore, polygon calculation with a high processing load is not performed. For this reason, it is possible to obtain a fast reaction.

  The reverse geocoding device further includes a closest mesh determination unit that determines that the closest mesh information closest to the target point is the closest mesh information based on the measurement distance measured by the distance measurement unit, and a place name acquisition unit Is determined according to the measurement distance between the closest mesh information measured by the distance measurement unit and the target point among the plurality of area names constituting the place name information included in the closest mesh information determined by the closest mesh determination unit. It is preferable to obtain a corresponding place name including the given area name.

  By adopting such a configuration of the reverse geocoding device, the corresponding place name is acquired based on the place name information included in the closest mesh information, and it is possible to further suppress the acquisition of an incorrect corresponding place name. Become.

In order to solve the above problems, the reverse geocoding method of the present invention includes position information indicating an area on the ground surface, at least a region name indicating a wide area portion of the area, and a region name indicating a region narrower than the wide area portion. A reverse geocoding method for a reverse geocoding device that obtains a corresponding place name corresponding to a target point that is one point on the ground surface using mesh information configured to include place name information, and a target position mesh search A target position mesh search step for searching for target position mesh information, which is mesh information corresponding to an area including the target point, and a determination unit includes place name information in the target position mesh information searched in the target position mesh search step. a judgment step of judging whether or not included, the proximity mesh determination unit, in decision, object position Messi A proximity mesh determination step of determining, when it is determined that the information does not include the place name information, mesh information including the place name information among the mesh information in the vicinity of the target position mesh information is the proximity mesh information; The distance measuring unit measures the distance measured by the distance between the area indicated by the position information included in the proximity mesh information determined in the proximity mesh determination step and the target point, and the place name acquisition unit A place name obtaining step for obtaining a corresponding place name including a place name determined according to the measured distance measured in the distance measuring step among a plurality of area names constituting the place name information included in the proximity mesh information; Prepare.

  According to the reverse geocoding method of the present invention, when the place name information is not included in the mesh information, the corresponding place name is obtained based on the place name information included in the neighboring mesh information. Therefore, it is possible to obtain the corresponding place name even when the place information is not included in the mesh information.

  Further, according to the inverse geocoding method of the present invention, the corresponding place name included in the mesh information is acquired according to the distance between the target point and the area indicated by the position information included in the mesh information. For this reason, it is possible to suppress acquisition of an incorrect corresponding place name.

  Furthermore, polygon calculation with a high processing load is not performed. For this reason, it is possible to obtain a fast reaction.

  According to the present invention, it is possible to provide a reverse geocoding device and a reverse geocoding method capable of acquiring place name information even when there is mesh information that is not associated with place name information. Become.

It is a figure which shows the function structure of the reverse geocoding system of 1st Embodiment. It is a figure which shows the example of the information which the mesh information holding part shown in FIG. 1 hold | maintains. It is a figure for demonstrating the process of the proximity mesh judgment part shown in FIG. It is a figure for demonstrating the process of the distance measurement part shown in FIG. It is a figure which shows the example of the information which the place name acquisition rule holding part shown in FIG. 1 hold | maintains. It is a figure for demonstrating the process of the distance measurement part shown in FIG. It is a figure which shows the flow of a process in the reverse geocoding apparatus shown in FIG. It is a figure which shows the reverse geocoding program in 1st Embodiment. It is a figure which shows the physical structure of the computer for performing a reverse geocoding program. FIG. 6 is a perspective view of a computer for executing a reverse geocoding program. It is a figure which shows the function structure of the reverse geocoding system of 2nd Embodiment. It is a figure for demonstrating the process of the proximity mesh judgment part shown in FIG. It is a figure for demonstrating the process of the distance measurement part shown in FIG. It is a figure which shows the flow of a process in the reverse geocoding apparatus shown in FIG.

  A reverse geocoding system 1 according to an embodiment of the present invention will be described with reference to the drawings. In the description, the same reference numerals are used for the same elements or elements having the same function, and a duplicate description is omitted.

[First Embodiment]
FIG. 1 is a diagram showing a functional configuration of a reverse geocoding system 1 in the first embodiment. As shown in this figure, the inverse geocoding system 1 of the present embodiment includes an inverse geocoding device 10, a terminal 20, a mesh information holding unit 30, and a place name acquisition rule holding unit 40.

  The reverse geocoding device 10 has a function of acquiring a corresponding place name corresponding to a target point that is one point on the ground surface using mesh information. Details of the functions of the reverse geocoding device 10 will be described later.

  Here, the mesh information includes position information indicating an area having a predetermined spread on the ground surface, place name information that is attribute information corresponding to the area, and a mesh identifier that makes the mesh information uniquely identifiable. Refers to information that contains. The position information and the place name information are associated with the mesh identifier one-on-one.

  The place name information is geographical attribute information that can be associated with an area, and is information having at least two or more layers (a region name indicating a wide area part and a region name indicating a region narrower than the wide area part). Refers to that. Specifically, for example, the prefecture name (first layer: a region name indicating a wide area part), a municipality name (second layer: a region name indicating a wide area part, or a region name indicating a region narrower than the wide area part), It is also possible to use information having three layers of a large name (third layer: a region name indicating a region narrower than the wide area).

  The position information refers to information that can specify the position and shape of the area on the ground surface.

  A target point refers to a specific point on the ground surface from which the reverse geocoding device 10 acquires a corresponding place name.

  In this embodiment, a point where a terminal 20 described later exists is used as an example of a target point for explaining the invention. However, it is not necessarily limited to this, and for example, a point identified by indicating one point on geographical information such as a road map displayed on the screen as the target point may be used.

  The terminal 20 is a terminal possessed by a user who uses the reverse geocoding device 10. The terminal 20 has a function of measuring the current position by using, for example, GPS (global positioning system) technology and transmitting information on longitude and latitude to the reverse geocoding device 10 as target point information. .

  Further, the terminal 20 has a function of receiving the corresponding location name acquired by the inverse geocoding device 10 from the inverse geocoding device 10 and displaying the received corresponding location name.

  Specifically, the terminal 20 is a mobile phone, a simple mobile phone (PHS: Personal Handy-phone System), a portable information terminal (PDA: Personal Digital Assistant) having a communication function, or a personal computer (PC: Personal Personal Assistant). Computer) or the like can be used. In this embodiment, a mobile phone is used as the terminal 20 for explaining the invention.

  The mesh information holding unit 30 has a function of holding mesh information.

  FIG. 2 shows an example of mesh information held by the mesh information holding unit 30. The place name information in this figure is registered in advance. However, there is mesh information for which place name information is not registered (assigned) for the reasons described above. For example, in the example shown in FIG. 2, the place name information is not registered (assigned) in the mesh information having the mesh identifiers “135135139610” and “135135139625”. These pieces of mesh information do not include place name information.

  In the present embodiment, the position information is expressed by latitude information and longitude information of the center point of the corresponding area. In the present embodiment, the area is a square having the same length in the north-south and east-west directions. Therefore, by specifying the longitude information and latitude information of the center and the length of one side of the square, the area information indicates the ground surface. The position and the shape at will be specified.

  In the present embodiment, by comparing the specific position information with the specific point on the ground surface displayed by longitude and latitude, the specific point is the area indicated by the specific position information. It is possible to determine whether it exists inside or outside the area.

  The length of one side of the square in the area is registered in advance and may be held in a holding unit (not shown). The length of one side of the square in the area can be freely set and does not need to be particularly limited. For example, it may be 10 m on a side.

  The place name acquisition rule holding unit 40 has a function of holding a place name acquisition rule that is a rule applied when a corresponding place name is acquired by a place name acquisition unit 17a described later. The details of the place name acquisition rule will be described in detail in the part describing the place name acquisition rule reception unit 16 and the place name acquisition unit 17a of the reverse geocoding device 10.

  The reverse geocoding device 10, the mesh information holding unit 30, and the place name acquisition rule holding unit 40 are physically servers on the network, and a basic configuration (for example, CPU, RAM, A ROM, a keyboard, a mouse, a communication device that communicates with the outside, a storage device that stores information, a display, and a printer) as appropriate. The functions of the reverse geocoding device 10, the mesh information holding unit 30, and the place name acquisition rule holding unit 40 are such that software such as a program is read on the server, and the software and each physical basic configuration in the server cooperate. It is realized by working. The reverse geocoding device 10, the mesh information holding unit 30, and the place name acquisition rule holding unit 40 may be a single server. Alternatively, the functions possessed by a plurality of servers may be realized in a distributed manner.

  Next, functions provided in the reverse geocoding device 10 will be described.

  Specifically, the reverse geocoding device 10 includes a target point acquisition unit 11, a target position mesh search unit 12, a determination unit 13, a proximity mesh determination unit 14a, a distance measurement unit 15a, a place name acquisition rule reception unit 16, and a place name acquisition unit. 17a and the place name transmission part 18 are comprised.

  The target spot acquisition unit 11 has a function of obtaining a target spot that is a target spot from which a corresponding place name is obtained. In addition, it has a function of outputting the obtained target point to a target position mesh search unit 12 and a distance measurement unit 15a described later.

  Specifically, the target spot acquisition unit 11 acquires the target spot from the terminal 20 by receiving latitude information and longitude information indicating the current position of the terminal 20 as target spot information.

  The target point acquisition unit 11 may acquire the target point by other methods. For example, longitude information and latitude information may be directly input by the user. Alternatively, the target point may be acquired by a method of specifying the target point by pointing a point on geographical information such as a road map displayed on a display (not shown) with a touch panel, a mouse, or the like.

  The target position mesh search unit 12 has a function of searching for target position mesh information that is mesh information corresponding to an area including the target point, and a function of outputting the searched target position mesh information to the determination unit 13 described later. Have.

  “Mesh information corresponding to an area” means mesh information including position information for displaying the area.

  In this embodiment, the area is a square having a predetermined length on one side and there is no overlap between the areas. Therefore, when one point on the ground surface is specified as the target point, one area including the target point is specified. The Rukoto.

  Furthermore, since there is a one-to-one correspondence between the area and the mesh information, when one target point is specified, only one target position mesh information is specified.

  Specifically, the target position mesh search unit 12 inputs the target point information acquired by the target point acquisition unit 11 from the target point acquisition unit 11.

  The target position mesh search unit 12 searches the target position mesh information by comparing the input target point information with the position information included in the mesh information held by the mesh information holding unit 30.

  The determination unit 13 has a function of determining whether or not the place name information is included in the target position mesh information searched by the target position mesh search unit 12.

  The determination unit 13 further outputs a target position mesh information to a later-described place name acquisition unit 17a when the target position mesh information is determined to include the place name information, and the target position mesh information includes the place name information. When it is determined that the target position mesh information is not included, the target position mesh information is output to the proximity mesh determination unit 14a described later.

  The proximity mesh determination unit 14a, when the determination unit 13 determines that the place name information is not included in the target position mesh information, the mesh information including the place name information among the mesh information in the vicinity of the target position mesh information. Is the proximity mesh information, and the determined proximity mesh information is output to the distance measurement unit 15a and the place name acquisition unit 17a described later.

  The “mesh information in the vicinity of the target position mesh information” means mesh information including position information indicating an area in the vicinity of the area indicated by the position information included in the target position mesh information. “Area adjacent to the area” means, for example, an area adjacent to the area. In some cases, it means an area further adjacent to an adjacent area. Furthermore, the area after repeating the adjacent multiple times is also included.

  Hereinafter, “mesh information including position information indicating an area adjacent (neighboring) to the area indicated by the position information included in the specific mesh information” is simply referred to as “mesh information adjacent to the specific mesh information (neighboring). ".

  Specifically, the proximity mesh determination unit 14 a inputs target position mesh information, and obtains mesh information adjacent to the target position mesh information from the mesh information holding unit 30. The proximity mesh determination unit 14a determines whether or not the position information is included in the mesh information obtained from the mesh information holding unit 30. When it is determined that the position information is included, the proximity mesh determination unit 14a determines that the mesh information is the proximity mesh information. The proximity mesh determination unit 14a outputs the proximity mesh information to the distance measurement unit 15a and the place name acquisition unit 17a described later.

  When it is determined that the mesh information input from the mesh information holding unit 30 does not include position information, the proximity mesh determining unit 14 a obtains mesh information adjacent to the mesh information input from the mesh information holding unit 30. The proximity mesh determination unit 14a determines whether or not position information is included in the obtained mesh information.

  Thereafter, acquisition of adjacent mesh information and determination of whether or not position information is included are repeated until it is determined that position information is included.

  FIG. 3 shows an example of the order in which the mesh information holding unit 30 acquires mesh information used to explain the invention in this embodiment and used to determine whether the proximity mesh determining unit 14a includes place name information. . In FIG. 3, an area A given a symbol A is an area indicated by position information included in the target position mesh information.

  As shown in FIG. 3, in the present embodiment, the proximity mesh determination unit 14 a performs mesh information adjacent to the north with respect to the target position mesh information, mesh information adjacent to the east with respect to the mesh information, and the mesh information. Mesh information adjacent to the south for the mesh information, mesh information adjacent to the south for the mesh information, mesh information adjacent to the west for the mesh information, mesh information adjacent to the west for the mesh information, Mesh information adjacent to the north for mesh information, mesh information adjacent to the north for the mesh information, mesh information adjacent to the north for the mesh information, mesh information adjacent to the east for the mesh information , Mesh information adjacent to the east for the mesh information, mesh information adjacent to the east for the mesh information, Mesh information adjacent to the south, mesh information adjacent to the south with respect to the mesh information, mesh information adjacent to the south with respect to the mesh information, and mesh information adjacent to the south with respect to the mesh information. It is determined whether or not the place name information is included in the mesh information. Thereafter, the direction of west, north, east, and south is repeated while increasing the number of times in the same direction when changing the direction to north and south. Needless to say, the order is not limited.

  A method of searching for mesh information adjacent in a specific direction can be realized by the following method. That is, the position information of this embodiment is an intermittent numerical value at predetermined angular intervals for both longitude information and latitude information. In the example shown in FIG. 2, the longitude information and the longitude information are both at intervals of 0.005 degrees. Therefore, when searching for mesh information adjacent to the north with respect to the current mesh information, the same longitude information as the longitude information included in the current mesh information as longitude information, and included in the current mesh information as latitude information Latitude information obtained by adding 0.005 degrees to latitude information is calculated, and mesh information including the calculated longitude information and latitude information may be searched.

  It repeats the acquisition of the mesh information from the mesh information holding unit 30 in the above order and the determination whether the obtained mesh information includes position information, and first determines that the mesh information includes position information. When this is done, the proximity mesh determination unit 14a determines that the mesh information is proximity mesh information. The proximity mesh determination unit 14a outputs the determined proximity mesh information to the distance measurement unit 15a and the place name acquisition unit 17a described later.

  The distance measurement unit 15a has a function of measuring a measurement distance that is a distance between an area indicated by the position information included in the proximity mesh information determined by the proximity mesh determination unit 14a and the target point.

  Here, “distance between the area and the target point” means a distance between the center point of the area and the target point in the present embodiment.

  Specifically, the distance measurement unit 15a inputs longitude information and latitude information as target point information from the target point acquisition unit 11, and the longitude of the position information included in the proximity mesh information determined by the proximity mesh determination unit 14a. Get information and latitude information.

  The distance measurement unit 15a measures the measurement distance by calculating the distance on the ground surface from the target point information and the position information, both of which are expressed by longitude information and latitude information.

  The processing of the distance measuring unit 15a will be conceptually described with reference to FIG. Now, of the areas shown in FIGS. 4A and 4B, the hatched area is an area that does not include place name information. In FIG. 4A, a point B with a symbol B is a target point. FIG. 4B is an enlarged view of a part of FIG.

  As described above, in the example of this figure, the target position mesh search unit 12 searches for mesh information including position information for displaying the area C with the symbol C as target position mesh information. The determination unit 13 determines that the place name information is not included in the target position mesh information. The proximity mesh determination unit 14a determines whether or not the place name information is included in the mesh information in the order illustrated in FIG. 3, and as a result of the determination, the proximity mesh determination unit 14a includes position information indicating the area D with the symbol D in FIG. The mesh information is determined as proximity mesh information. The proximity mesh determination unit 14a outputs the proximity mesh information to the distance measurement unit 15a.

  As described above, the distance measuring unit 15a, as shown in FIG. 4B, is the target point (point B) and the center position of the area D that is the area indicated by the position information included in the proximity mesh information. The distance (distance H with symbol H in FIG. 4B) is measured and set as the measurement distance.

  In this embodiment, the position information included in the proximity mesh information is composed of longitude information and latitude information of the center point of the area. Therefore, the distance between the two points on the ground surface can be easily calculated (without applying a large processing load) by the position information and the target point that is also composed of longitude information and latitude information. The distance measuring unit 15a sets the distance calculated in this way as the measurement distance.

  However, it is not necessary to limit to this method, and the distance between the target point and the boundary line of the area (distance I with symbol I in FIG. 4B) may be measured.

  The place name acquisition rule receiving unit 16 has a function of receiving a place name acquisition rule from the place name acquisition rule holding unit 40 and a function of outputting the received place name acquisition rule to the place name acquisition unit 17a described later.

  Here, the place name acquisition rule is a reference to which level of information of the hierarchical structure constituting the place name information included in the mesh information is to be acquired. In other words, it is a standard of how accurate the place name information is acquired (here, accuracy is “fineness” or “granularity”, not “accuracy”).

  FIG. 5 shows an example of a place name acquisition rule held by the place name acquisition rule holding unit 40. As shown in this figure, the place name acquisition rule holding unit 40 holds the measurement distance and the place name acquisition accuracy in association with each other. As shown in the example of FIG. 5, the place name acquisition rule of this embodiment acquires a region name indicating a wide area as the measurement distance is long, and a region name indicating a region narrower than the wide area as the measurement distance is short. It is a rule to acquire place name information.

  That is, according to the place name acquisition rule of this embodiment, only the administrative division (prefecture in the example of FIG. 5) that is a coarse hierarchy is acquired as the measurement distance is long, and the administrative division (in FIG. 5) is a fine hierarchy as the measurement distance is short. In the example, it is a rule to get up to (capital name).

  The rules shown in FIG. 5 may be set in advance by the administrator of the reverse geocoding device 10. Alternatively, it may be set freely by the user.

  The place name acquisition unit 17a has a function of acquiring a corresponding place name including an area name determined according to the measurement distance measured by the distance measurement unit 15a among a plurality of area names constituting the place name information included in the proximity mesh information. And a function of outputting the acquired area name as a corresponding place name to a place name transmitting unit 18 described later.

  “Including a region name determined according to the measurement distance” means that a region name determined according to the measurement distance and a region name wider than the region name are included.

  The place name information of the present embodiment has a hierarchical structure, and is a hierarchy indicating a prefecture name which is the hierarchy indicating the widest area, a municipality name which is a hierarchy indicating a narrower area than the prefecture, and an area narrower than the municipality name. It has a three-layer structure with a large name.

  More specifically, the “area name determined according to the measurement distance” is more specifically, for example, if the area name according to the measurement distance is a municipality, the name of the prefecture or city / town / village that is a higher hierarchy. , And the meaning.

  The area name is a name given to a certain area, and specifically a place name. In the present embodiment, “Kanagawa Prefecture”, “XX City”, “aaa”, or the like shown in FIG. “Multiple regional names” refers to multiple regional names given to one area, but here, for example, “Nobi, Yokosuka City, Kanagawa” and “Kurihama, Yokosuka City, Kanagawa” It does not mean that multiple place name information is given. Here, “multiple regional names” means “regional names of multiple levels”, specifically “Kanagawa Prefecture”, “Yokohama City” and “Nobi” given to one area. means.

  More specifically, the place name acquisition unit 17a compares the measurement distance measured by the distance measurement unit 15a with the measurement distance included in the place name acquisition rule received by the place name acquisition rule reception unit 16, and determines which place name acquisition accuracy. Determine if it should apply. For example, in the example of FIG. 5, when 0 km <= measurement distance <= 5 km, the place name acquisition unit 17a determines that the area name determined according to the measurement distance is “large name”, and the place name information Of these, the corresponding place name is acquired by combining the prefecture name, municipality name, and large name.

  When 5 km <measurement distance <= 10 km, the place name acquisition unit 17 a determines that the area name determined according to the measurement distance is “city name”, and combines the name of the city, town, and village in the place name information. The corresponding place name is acquired.

  When 10 km <measured distance <= 20 km, the place name acquisition unit 17a determines that the area name determined according to the measured distance is “prefecture”, and acquires the place name in the place name information as the corresponding place name. To do.

  In the example shown in FIG. 5, the place name acquisition unit 17a does not acquire the corresponding place name when the measurement distance is greater than 20 km.

  This will be conceptually described with reference to FIGS. In the example of FIG. 4B, as described above, the distance measurement unit 15a measures the distance H as the measurement distance. It is assumed that the distance H is 4 km, for example. Further, it is assumed that the mesh identifier included in the mesh information (positional mesh information) including the position information indicating the area D in the example of FIG. 4 is “135135139620”.

  In this example, since the measurement distance is 4 km, the place name acquisition unit 17a refers to the place name acquisition rule received by the place name acquisition rule reception unit 16 and determines that the place name acquisition accuracy is up to “large name” (FIG. 5). The place name acquisition unit 17a receives the “prefecture name”, “city name”, and “large name” from among a plurality of area names constituting the place name information included in the close mesh information input from the close mesh determination unit 14a. “Kanagawa Prefecture XX city ccc” combining these area names is acquired as a corresponding place name.

  On the other hand, in the example shown in FIG. 6, the point E with the symbol E is the target point, and the area F with the symbol F is the area indicated by the position information included in the target position mesh information. An area G with a symbol G is an area indicated by position information included in the proximity mesh information determined by the proximity mesh determination unit 14a. The place name acquisition unit 17a inputs proximity mesh information from the proximity mesh determination unit 14a. Assume that the mesh identifier included in the proximity mesh information is “135130139615”. It is assumed that the measurement distance (distance J with the symbol J in FIG. 6B) is 11 km.

  In this example, since the measurement distance is 11 km, the place name acquisition unit 17a refers to the place name acquisition rule received by the place name acquisition rule receiver 16 according to the above method, and determines that the place name acquisition accuracy is up to “prefecture”. To do. The place name obtaining unit 17a obtains “Kanagawa Prefecture”, which is the “prefecture name”, from among a plurality of area names constituting the place name information included in the mesh information input from the proximity mesh determining unit 14a.

  Since the place name acquisition unit 17a has the above function, as the measurement distance increases, the acquisition of the corresponding place name (display of the place name on the terminal 20) is rough (for example, acquisition up to the prefecture name) (the range indicated by the place name is wide). It becomes acquisition. For this reason, it is possible to suppress mistakes in acquisition (display). If the measured distance is larger than a predetermined value (20 km in the example shown in FIG. 5), the corresponding place name is not acquired. For example, when the place is on the sea far away from the land, the place name is acquired (on the terminal 20). If the display of the place name in (2) is inappropriate, the corresponding place name is not acquired (displayed), and the acquisition (display) error of the corresponding place name can be minimized.

  When the determination unit 13 determines that the place name information is included in the target position mesh information, the place name acquisition unit 17a inputs the target position mesh information from the determination unit 13 and includes it in the input target position mesh information. To obtain the corresponding place name information.

  The place name transmitting unit 18 has a function of transmitting the corresponding place name acquired by the place name acquiring unit 17 a to the terminal 20.

  Since the place name transmission unit 18 has such a function, the corresponding place name corresponding to the target point transmitted by the terminal 20 is transmitted to the terminal 20, thereby responding to the request of the terminal 20.

[Processing flow]
Next, a processing flow of the reverse geocoding device 10 according to the present embodiment will be described with reference to FIG.

  The target spot acquisition unit 11 obtains a target spot that is a target spot from which a corresponding place name is obtained (step S101).

  The target position mesh search unit 12 searches for target position mesh information that is mesh information corresponding to an area including the target point (step S102: target position mesh search step).

  The determination unit 13 determines whether or not the place name information is included in the target position mesh information searched by the target position mesh search unit 12 (step S103: determination step).

  When the determination unit 13 determines that the place name information is not included in the target position mesh information (“NO” in step S103), the proximity mesh determination unit 14a includes the mesh information in the vicinity of the target position mesh information. The mesh information including the place name information is determined as proximity mesh information (step S104: proximity mesh determination step).

  The distance measurement unit 15a measures a measurement distance that is a distance between the area indicated by the position information included in the proximity mesh information determined by the proximity mesh determination unit 14a and the target point (step S105: distance measurement step).

  The place name acquisition rule receiving unit 16 receives the place name acquisition rule from the place name acquisition rule holding unit 40 (step S106).

  The place name acquisition unit 17a acquires a corresponding place name including an area name determined according to the measurement distance measured by the distance measurement unit 15a among a plurality of area names constituting the place name information included in the proximity mesh information ( Step S107: Place name acquisition step). When the determination unit 13 determines that the place name information is included in the target position mesh information (“YES” in step S103), the place name acquisition unit 17a includes a plurality of pieces of place name information included in the target position mesh information. A corresponding area name is acquired from the area name (step S107: place name acquisition step).

  The place name transmitting unit 18 transmits the corresponding place name acquired by the place name acquiring unit 17a to the terminal 20 (step S108).

  Hereinafter, a reverse geocoding program P100 for causing the computer 50 to operate as the reverse geocoding device 10 will be described.

  FIG. 8 is a diagram showing the reverse geocoding program P100 of the present embodiment. FIG. 9 is a diagram showing a hardware configuration of the computer 50 for executing the reverse geocoding program P100. FIG. 10 is a perspective view of a computer 50 for executing the reverse geocoding program P100 stored in the recording medium.

  As shown in FIG. 8, the reverse geocoding program P100 is provided by being stored in the recording medium 104. The recording medium 104 is exemplified by a recording medium such as a floppy disk, CD-ROM, DVD, or ROM, or a semiconductor memory.

  As shown in FIG. 9, the computer 50 physically includes a reading device 105 such as a floppy disk drive device, a CD-ROM drive device, and a DVD drive device, a working memory (RAM) 102 in which an operating system is resident, Communication for transmitting and receiving data and the like connected to a memory 103 for storing a program stored in the recording medium 104, a display device 106 such as a display, a mouse 107 and a keyboard 108 as input devices, and a network 110 An apparatus 109 and a CPU 101 that controls execution of a program are provided. When the recording medium 104 is inserted into the reading device 105, the computer 50 can access the reverse geocoding program P100 stored in the recording medium 104 from the reading device 105, and the reverse geocoding program P100 can perform reverse geocoding. It becomes possible to operate as the device 10.

  As shown in FIG. 10, the inverse geocoding program P100 may be provided via a network as a computer data signal 51 superimposed on a carrier wave. In this case, the computer 50 can store the reverse geocoding program P100 received by the communication device 109 in the memory 103 and execute the reverse geocoding program P100.

  As shown in FIG. 8, the reverse geocoding program P100 includes a target point acquisition module P101, a target position mesh search module P102, a determination module P103, a proximity mesh determination module P104, a distance measurement module P105, a place name acquisition rule reception module P106, a place name. An acquisition module P107 and a place name transmission module P108 are included.

  The functions realized by executing the above modules are the same as the functions of the reverse geocoding device 10 described above. At this time, the target point acquisition module P101 is the target point acquisition unit 11, the target position mesh search module P102 is the target position mesh search unit 12, the determination module P103 is the determination unit 13, and the proximity mesh determination module P104 is the proximity mesh determination unit. 14a, the distance measurement module P105 is a distance measurement unit 15a, the place name acquisition rule reception module P106 is a place name acquisition rule reception unit 16, the place name acquisition module P107 is a place name acquisition unit 17a, and the place name transmission module P108 is a place name transmission unit 18. , Respectively.

[About action and effect]
Next, the operation and effect of this embodiment will be described.

  The inverse geocoding device 10 of the present embodiment receives the target position mesh information from the mesh information holding unit 30, and when the received target position mesh information does not include place name information, the proximity mesh determination unit 14a The mesh information that is the neighboring mesh information and includes the position information is determined to be the proximity mesh information, and the distance measurement unit 15a includes the target point and the area indicated by the position information included in the proximity mesh information. The measurement distance, which is a distance, is measured, and the place name acquisition unit 17a acquires the corresponding place name according to the measurement distance measured by the distance measurement unit 15a.

  Therefore, the place name information can be acquired even when there is mesh information that does not include the place name information.

  Moreover, in the reverse geocoding apparatus 10 of this embodiment, the corresponding place name is acquired according to the distance between the target point and the area indicated by the position information included in the mesh information. For this reason, it is possible to suppress acquisition of an incorrect corresponding place name.

  Furthermore, since the reverse geocoding device 10 of the present embodiment does not perform polygon calculation with a high processing load, it is possible to obtain a high-speed reaction.

[Second Embodiment]
In the first embodiment, the proximity mesh determination unit 14a of the inverse geocoding device 10 determines whether or not place name information is included one by one with respect to neighboring mesh information one by one. The determined mesh information is determined to be proximity mesh information.

  It may be determined whether position information is included for a plurality of mesh information, and closest mesh information closest to the target point may be determined from among the mesh information including the position information.

  The inverse geocoding device 10 according to the second embodiment that determines nearest mesh information will be described. However, the description of the same parts as in the first embodiment will be omitted, and the description will focus on the parts different from the first embodiment.

  FIG. 11 shows a functional configuration of the reverse geocoding system 1 of the present embodiment. As shown in this figure, the reverse geocoding system 1 of the present embodiment includes a reverse geocoding device 10, a terminal 20, a mesh information holding unit 30, and a place name acquisition rule holding unit 40.

  Among these, since the function which the terminal 20, the mesh information holding | maintenance part 30, and the place name acquisition rule holding | maintenance part 40 have is the same as that of the said 1st Embodiment, description is abbreviate | omitted here.

  Specifically, the reverse geocoding device 10 of the present embodiment includes a target point acquisition unit 11, a target position mesh search unit 12, a determination unit 13, a proximity mesh determination unit 14b, a distance measurement unit 15b, and a place name acquisition rule reception unit 16. , A place name acquisition unit 17b, a place name transmission unit 18, and a closest mesh determination unit 19.

  Among these, the functions of the target point acquisition unit 11, the target position mesh search unit 12, the determination unit 13, the place name acquisition rule reception unit 16, and the place name transmission unit 18 are the same as those in the first embodiment, and will be described here. Is omitted.

  The proximity mesh determination unit 14b has a function of determining, as proximity mesh information, all mesh information including position information among a plurality of mesh information in the vicinity of the target position mesh information searched by the target position mesh search unit 12. And the determined proximity mesh information is output to the distance measuring unit 15b described later.

  “A plurality of pieces of mesh information in the vicinity of the target position mesh information” means a plurality of pieces of mesh information including position information indicating areas near the area indicated by the position information included in the target position mesh information.

  “Nearby area” refers to an adjacent area, for example. In some cases, it refers to an area further adjacent to an adjacent area. Furthermore, the area after repeating the adjacent multiple times is also included.

  In this embodiment, the area adjacent to the specific area includes not only four areas adjacent in the east, west, south, and north directions of the specific area, but also four areas adjacent in the southeast, northeast, southwest, and northwest directions. include.

  Hereinafter, mesh information including position information indicating an area adjacent (neighboring) to an area indicated by position information included in the specific mesh information is referred to as (neighboring) mesh information adjacent to the specific mesh information.

  Specifically, the proximity mesh determination unit 14b receives a plurality of pieces of mesh information adjacent to the target position mesh information searched by the target position mesh search unit 12 from the mesh information holding unit 30, and for each received mesh information Determine whether information is included.

  The search for mesh information adjacent to specific mesh information can be performed by using the method described in the first embodiment.

  When it is determined whether or not the position information is included in all of the plurality of mesh information received from the mesh information holding unit 30, and it is determined that the position information is included in at least one mesh information, the proximity mesh determination unit 14b outputs all the mesh information determined to include position information to the distance measuring unit 15b described later as proximity mesh information.

  When it is determined that the position information is not included for all of the plurality of adjacent mesh information, the proximity mesh determination unit 14b is mesh information adjacent to the mesh information received from the mesh information holding unit 30 immediately before The mesh determination unit 14b receives mesh information from the mesh information holding unit 30 that has not been determined whether the position information is included. The proximity mesh determination unit 14b determines whether position information is included for each piece of mesh information received from the mesh information holding unit 30.

  The proximity mesh determination unit 14b receives a plurality of neighboring mesh information and determines whether or not each received mesh information includes position information. One or more mesh information includes position information. Repeat until it is determined.

  The determination method of the proximity mesh determination unit 14b will be conceptually described with reference to FIG.

  In FIG. 12, an area A with a symbol A is an area indicated by position information included in the target position mesh information searched by the target position mesh search unit 12.

  According to the above method, the proximity mesh determination unit 14b first receives the mesh information including the position information indicating the area marked with the symbol K in FIG. 12 from the mesh information holding unit 30, and the position information is received for all the received mesh information. Determine whether it is included.

  When the proximity mesh determination unit 14b determines whether or not there is position information when it is determined that the position information is not included according to the above method, the area where the symbol L is added in FIG.

  According to the above method, for example, when there are a plurality of mesh information including position information in the mesh information including the position information indicating the area marked with the symbol L in FIG. 12, the proximity mesh determining unit 14b All the mesh information is determined to be proximity mesh information, and all the determined proximity mesh information is output to the distance measurement unit 15b described later.

  The distance measurement unit 15b measures, for each proximity mesh information, a measurement distance that is a distance between the area indicated by the position information included in each of the one or more proximity mesh information determined by the proximity mesh determination unit 14b and the target point. It has a function.

  The method for measuring the distance between the area and the target point is the same as the method described in the first embodiment.

  The distance measuring unit 15b outputs the measured distance for each measured neighboring mesh information to the closest mesh determining unit 19 described later in association with the corresponding neighboring mesh information.

  The closest mesh determination unit 19 has a function of determining the closest mesh information closest to the target point among the proximity mesh information based on the measurement distance measured by the distance measurement unit 15b.

  Specifically, the closest mesh determination unit 19 determines the shortest measurement distance among the measurement distances measured by the distance measurement unit 15b for each proximity mesh information, and the proximity mesh information corresponding to the shortest measurement distance. Is the closest mesh information.

  The closest mesh determination unit 19 outputs the determined closest mesh information and the corresponding measurement distance to the place name acquisition unit 17b described later.

  A method for the closest mesh determination unit 19 to determine the closest mesh information will be conceptually described with reference to FIG.

  FIG. 13 shows the same state as FIG. 6 in the first embodiment. FIG. 13B is an enlarged view of the main part of FIG.

  As described in the first embodiment, in the example of this figure, the target position mesh search unit 12 searches for mesh information including position information indicating the area F as target position mesh information.

  As described above, the proximity mesh determination unit 14b determines whether or not position information is included in mesh information including position information indicating an area adjacent to the area F. As a result of the determination, in the example shown in FIG. 13, it is determined that four pieces of mesh information including position information indicating the areas G, N, P, and Q are adjacent mesh information.

  As described above, the distance measurement unit 15b measures the measurement distance that is the distance from the target point for each piece of proximity mesh information. In the example shown in FIG. 13, the distance J, the distance T, the distance S, and the distance R are measured.

  As described above, the closest mesh determination unit 19 illustrated in FIG. 13 determines the proximity mesh information corresponding to the shortest measurement distance among the measurement distances measured by the distance measurement unit 15b as the closest mesh information. In the example, the closest mesh determination unit 19 determines that the mesh information including the position information indicating the area Q is the closest mesh information.

  The place name acquisition unit 17b, among a plurality of area names constituting the place name information included in the nearest mesh information determined by the nearest mesh determination unit 19, determines the closest mesh information measured by the distance measurement unit 15b and the target point. It has a function to acquire the corresponding place name according to the measurement distance.

  The method for acquiring the corresponding place name according to the measurement distance is the same as the method described in the first embodiment.

  Next, the flow of processing in the reverse geocoding device 10 of this embodiment will be described with reference to FIG.

  The processes in steps S201, S202, S203, S207, and S209 illustrated in FIG. 14 are the same as the processes in steps S101, S102, S103, S106, and S108 in the first embodiment, and thus description thereof is omitted here.

  The proximity mesh determination unit 14b determines, as proximity mesh information, all mesh information including position information among a plurality of pieces of mesh information in the vicinity of the target position mesh information searched by the target position mesh search unit 12 ( Step S204).

  The distance measurement unit 15b measures, for each proximity mesh information, a measurement distance that is a distance between the area indicated by the position information included in each of the one or more proximity mesh information determined by the proximity mesh determination unit 14b and the target point. (Step S205).

  The closest mesh determination unit 19 determines that the proximity mesh information corresponding to the shortest measurement distance among the measurement distances measured by the distance measurement unit 15b is the closest mesh information (step S206).

  The place name acquisition unit 17b, among a plurality of area names constituting the place name information included in the nearest mesh information determined by the nearest mesh determination unit 19, the nearest mesh information measured by the distance measurement unit 15b and the target point. A corresponding place name corresponding to the measured distance is acquired (step S208). When the determination unit 13 determines that the place name information is included in the target position mesh information (“YES” in step S203), the place name acquisition unit 17b includes a plurality of pieces of place name information included in the target position mesh information. The area name is acquired as the corresponding place name (step S208).

  Next, functions and effects in the present embodiment will be described.

  The closest mesh determination unit 19 of the reverse geocoding device 10 according to the present embodiment determines that the closest mesh information closest to the target point among the one or more adjacent mesh information is the closest mesh information, and the place name acquisition unit 17b. Since the corresponding place name is acquired based on the place name information included in the closest mesh information, it is possible to further suppress the acquisition of an incorrect corresponding place name.

  DESCRIPTION OF SYMBOLS 1 ... Reverse geocoding system, 10 ... Reverse geocoding apparatus, 11 ... Target location acquisition part, 12 ... Target position mesh search part, 13 ... Judgment part, 14a, 14b ... Proximity mesh judgment part, 15a, 15b ... Distance measurement part , 16 ... Place name acquisition rule receiving section, 17a, 17b ... Place name acquisition section, 18 ... Place name transmission section, 20 ... Terminal, 30 ... Mesh information holding section, 40 ... Place name acquisition rule holding section.

Claims (3)

Using mesh information configured to include position information indicating an area on the ground surface, and area name information including at least an area name indicating a wide area portion of the area and an area name indicating an area narrower than the wide area area. , A reverse geocoding device that acquires a corresponding place name corresponding to a target point that is one point on the ground surface,
A target position mesh search unit for searching for target position mesh information which is mesh information corresponding to an area including the target point;
A determination unit that determines whether or not place name information is included in the target position mesh information searched by the target position mesh search unit;
When the determination unit determines that the place name information is not included in the target position mesh information, the mesh information including the place name information among the mesh information in the vicinity of the target position mesh information is displayed as proximity mesh information. A proximity mesh determination unit that determines that there is,
A distance measurement unit that measures a measurement distance that is a distance between the area indicated by the position information included in the proximity mesh information determined by the proximity mesh determination unit and the target point;
Among a plurality of area names constituting the place name information included in the proximity mesh information, a place name acquisition unit for acquiring a corresponding place name including an area name determined according to the measurement distance measured by the distance measurement unit;
A reverse geocoding device comprising: The reverse geocoding device further includes a closest mesh determination unit that determines that the proximity mesh information closest to the target point is closest mesh information based on the measurement distance measured by the distance measurement unit,
The place name acquisition unit includes the nearest mesh information measured by the distance measurement unit and a target point among a plurality of area names constituting the place name information included in the nearest mesh information determined by the nearest mesh determination unit. The reverse geocoding device according to claim 1, wherein a corresponding place name including an area name determined according to the measured distance is acquired. Using mesh information configured to include position information indicating an area on the ground surface, and area name information including at least an area name indicating a wide area portion of the area and an area name indicating an area narrower than the wide area area. , A reverse geocoding method of a reverse geocoding device that acquires a corresponding place name corresponding to a target point that is a point on the ground surface,
A target position mesh search unit for searching for target position mesh information that is mesh information corresponding to an area including the target point; and
A determination step of determining whether or not the place name information is included in the target position mesh information searched in the target position mesh search step;
When the neighborhood mesh judgment unit judges that the target position mesh information does not include the place name information in the judgment step, the mesh containing the place name information among the mesh information near the target position mesh information A proximity mesh determination step for determining that the information is proximity mesh information;
A distance measurement step in which a distance measurement unit measures a measurement distance that is a distance between the area indicated by the position information included in the proximity mesh information determined in the proximity mesh determination step and the target point;
The place name acquisition unit acquires a corresponding place name including an area name determined according to the measured distance measured in the distance measuring step among a plurality of area names constituting the place name information included in the proximity mesh information. A reverse geocoding method comprising: a place name acquisition step.

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