JP2022132983A - Information processor, map data creation method, map data creation system, program, and map data - Google Patents

Abstract

To provide a technique for easily superimposing a cadastral map on a house display map with high accuracy.SOLUTION: An information processor creates map data. The information processor includes: a dividing section that divides a cadastral map polygon into a parcel polygon group including a plurality of parcel polygons; a generation section that generates a reference point for each of the parcel polygons; a filtering section that performs first filtering for extracting the reference point on the basis of at least one of an area and a distortion degree of the parcel polygon; and a creation section that obtains public coordinate system coordinates of the extracted reference point, using the public coordinate system coordinates of the reference point, superimposes the parcel polygon group on a house map and creates the map data.SELECTED DRAWING: Figure 1

Description

The present invention relates to an information processing device, a map data creation method, a map data creation system, a program, and map data.

In Japan, there are maps annexed to land registers called public maps. A public map is a document that clarifies the division of land, and contains a number assigned by the registry office to each piece of land called a parcel number. In real estate registration, it is necessary to clarify the lot numbers and land parcels, so public maps are still used in land transactions. Patent Document 1 exists as a technique for facilitating the investigation of this parcel number.

In Patent Literature 1, an electronic residential map and an electronic lot number map are superimposed and displayed, thereby making it possible to easily investigate the correspondence relationship between the residential display and the lot number indicated on the public map.

JP-A-2005-99540

Many public maps were created in the Meiji period, and it was difficult to make accurate surveys with the technology of the time, and there are often large errors in the current location and shape of the land. For this reason, it is difficult for the technique disclosed in Patent Document 1 to superimpose with a high degree of accuracy a house display map using a GIS (Geographic Information System). In addition, when trying to superimpose with high precision, it is necessary to rely on human labor, which is very time-consuming.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a technique for easily superimposing a public map and a residential display map with high accuracy.

The present invention is an information processing apparatus for creating map data, comprising: a dividing unit that divides a public map polygon into a brush polygon group including a plurality of brush polygons; a generation unit that generates a reference point for each of the brush polygons; a filtering unit that performs a first filtering for extracting the reference point based on at least one of the area and the degree of distortion of the brush polygon; and a creating unit that creates map data by superimposing the brush polygon group on a residential map using public coordinate system coordinates.

According to the present invention, it is possible to provide a technique for superimposing a public map and a housing display map with high accuracy and ease.

1 is a block diagram showing a schematic configuration of a map generation system according to a first embodiment; FIG. It is a block diagram which shows the hardware constitutions of an information processing apparatus. FIG. 4 is a flowchart showing map data creation processing according to the first embodiment; FIG. 7 is a flow diagram showing reference point generation processing according to the first embodiment; FIG. 5 is a flow diagram showing first filtering processing according to the first embodiment; 4 is a flow diagram showing geocoding processing according to the first embodiment; FIG. FIG. 5 is a flowchart showing superimposition processing according to the first embodiment; FIG. 11 is a block diagram showing a schematic configuration of a map generation system according to a second embodiment; FIG. FIG. 11 is a flowchart showing map data generation processing according to the second embodiment;

Hereinafter, embodiments of the present invention will be specifically described with reference to the drawings. In addition, although the following specific examples are examples of embodiments according to the present invention, the present invention is not limited to the following specific forms.

[First embodiment]
FIG. 1 is a block diagram showing a schematic configuration of a map generation system 1 according to the first embodiment. The map generation system 1 processes public map polygon data 30 including a plurality of brush polygons, and creates map data 40 superimposed on a residential display map using GIS. The map generation system 1 includes an information processing device 10 and a geocoding device 20 . Here, the brush polygon is polygon data representing one stroke (one section on the land register) included in the public map polygon data 30 .

Information processing apparatus 10 includes segmentation unit 11 , generation unit 12 , filtering unit 13 , creation unit 14 , and output unit 15 .

The dividing unit 11 divides the public map polygon data 30 into predetermined brush polygon groups.

The generator 12 generates a reference point for each brush polygon. Also, the area of each brush polygon is indexed and the degree of distortion is indexed. Then, the indexed area and degree of distortion, and the attribute data of the brush polygon are linked to each reference point. In this specification, the degree of distortion is a numerical representation of the degree of distortion of the shape of the brush polygon.

The filtering unit 13 filters the reference points based on the information associated with the reference points.

The creation unit 14 acquires the public coordinate system (planar rectangular coordinate system) coordinates of the brush polygon including the filtered reference point from the geocoding device 20, and obtains the public coordinate system coordinates of the reference point. Then, using the reference points from which the public coordinate system is obtained, the brush polygon groups are superimposed on the residential map to create map data.

The output unit 15 outputs the created map data to, for example, a display device or other external device.

Geocoding device 20 includes functionality as a geocoder. The geocoding device 20 acquires the reference point data filtered by the filtering unit 13 from the filtering unit 13 . Here, the reference point data is data including reference points and information linked to the reference points. Then, the parcel address of each brush polygon containing the obtained reference point is converted into latitude and longitude, and filtering is performed to extract the reference point that satisfies a predetermined condition. The geocoding device 20 converts the latitude and longitude of each brush polygon containing the extracted reference point into the public coordinate system, and outputs it to the creation unit 14 .

Next, the hardware configuration of the information processing apparatus 10 will be described using FIG. FIG. 2 is a block diagram showing the hardware configuration of the information processing device 10. As shown in FIG. The information processing device 10 includes a storage unit 51 , a RAM 52 , a ROM 53 , a CPU 54 and a communication unit 55 .

The storage unit 51 stores programs executed by the CPU 54, which will be described later, and data used by the programs. In addition, the storage unit 51 can store various data used for processing, created map data, and the like.

The CPU 54 operates based on programs stored in the ROM 53 or the storage section 51 and controls each section of the information processing apparatus 10 . The ROM 53 stores a boot program executed by the CPU 54 when the information processing device 10 is started, a program depending on the hardware of the information processing device 10, and the like. The CPU 54, for example, executes a program loaded on the RAM 52 to realize the flow described later. Note that the CPU 54 may acquire these programs from another device, for example, via a network, and execute them.

For example, the communication unit 55 can receive data or instructions from the outside such as another device via a network, send the received data or instructions to the CPU 54, and transmit the data or instructions generated by the CPU 54 to the other devices.

Information processing device 10 may be connected to input device 60 and display device 70 . The input device 60 is, for example, a touch panel, a keyboard, a mouse, or the like that receives an operation input from the user. The display device 70 is, for example, a liquid crystal display panel, a plasma display panel, an organic EL (Electro Luminescence) display panel, or the like.

Since the geocoding device 20 may also have the same hardware configuration, description of the hardware configuration of the geocoding device 20 is omitted.

Next, with reference to FIG. 3, the overall flow of map data creation processing according to the first embodiment will be described, and details of each step will be described later. FIG. 3 is a flowchart showing map data creation processing according to the first embodiment. Each operation (step) shown in this flowchart can be executed under the control of the CPU 54 of the information processing device 10 or the CPU of the geocoding device 20 .

In S110, the cutting section 11 determines the adjacency relationship of a plurality of brush polygons included in the public map polygon data 30 using topology, and generates a cutting polygon containing them. Then, the segmenting unit 11 uses the generated segmenting polygons to divide into adjacent brush polygon groups, and generates brush polygon group data containing a plurality of brush polygons.

In S120, the generator 12 generates a reference point for each brush polygon. Also, the area of each brush polygon is indexed and the degree of distortion is indexed. Then, the indexed area and degree of distortion, and the attribute data of the brush polygon are linked to each reference point.

In S130, the filtering unit 13 performs first filtering. Specifically, the filtering unit 13 filters the reference points based on the information associated with the reference points. The filtering unit 13 then outputs the extracted reference point data to the geocoding device 20 .

In S<b>140 , the geocoding device 20 acquires filtered reference point data from the filtering unit 13 . Then, the geocoding device 20 converts the lot number and address associated with the acquired reference point into latitude and longitude, and further performs filtering for extracting reference points that satisfy predetermined conditions. This filtering is referred to as second filtering. The geocoding device 20 converts the latitude and longitude of each brush polygon including the extracted reference point into the public coordinate system, and outputs it to the creation unit 14 .

In S150, the creation unit 14 acquires from the geocoding device 20 the public coordinate system coordinates of the brush polygon including the reference point filtered by the geocoding device 20, and obtains the public coordinates of the reference point. Then, the brush polygon group is superimposed on the residential map with reference to the reference point for which the coordinates of the public coordinate system have been determined to create map data.

In S160, the output unit 15 acquires the created map data from the creating unit 14, and outputs the map data to a display device or other external device. Through the flow described above, map data in which the public map and the residential display map are superimposed with high accuracy is created.

Next, detailed processing of each step described above will be described. First, the detailed flow of the reference point generation process (S120) will be described with reference to FIG. FIG. 4 is a flow diagram showing a reference point generation process according to the first embodiment. Each operation (step) shown in this flowchart can be executed under the control of the CPU 54 of the information processing apparatus 10 .

In S121, the generator 12 generates a reference point for each brush polygon. The reference point may be any point within each brush polygon.

In S122, the generator 12 indexizes the area of each brush polygon. Specifically, the generator 12 calculates the area of each brush polygon and obtains the index for the reference value. It should be noted that indexing the area is preferable because it facilitates post-processing, but it is also possible to simply use the numerical value of the area without indexing.

In S123, the generator 12 indexizes the degree of distortion of each brush polygon. Specifically, the generator 12 first quantifies the degree of distortion of each brush polygon. The skewness can be quantified by calculating the ratio of the perimeter to the area. It can be said that the smaller the ratio of the perimeter to the area, the smaller the degree of distortion. That is, the closer the shape of the brush polygon is to a perfect circle, the smaller the degree of distortion. Next, the generation unit 12 obtains an index for the reference value of the degree of distortion of each digitized brush polygon. It should be noted that it is preferable to index the degree of distortion because it facilitates processing in the post-process, but it is also possible to simply use the numerical value of the degree of distortion without indexing.

In S124, the generation unit 12 associates information with each reference point. Specifically, the generation unit 12 associates the indexed area and degree of distortion with the attribute data of the brush polygon. Here, the attribute data of the brush polygon includes the lot number (lot number address) of the location of the block of the brush polygon and, if the block belongs to a road, river, or unknown block, the information thereof. After completion of S124, the process proceeds to S130.

Next, the detailed flow of the first filtering process (S130) will be described with reference to FIG. FIG. 5 is a flowchart showing first filtering processing according to the first embodiment. Each operation (step) shown in this flowchart can be executed under the control of the CPU 54 of the information processing apparatus 10 .

In S131, the filtering unit 13 checks whether or not there is a reference point whose area index associated with the reference point is equal to or greater than a threshold. If there is a reference point whose area index is equal to or greater than the threshold (Yes), the filtering unit 13 eliminates the reference point whose area index is equal to or greater than the threshold in S132. In addition, as described above, it is also possible to perform this step using the area itself instead of the index. Also, in this process, the smaller the threshold, the more the overlay accuracy in the subsequent process can be improved. In other words, the more the associated reference point with a smaller area is used, the more the overlay accuracy is improved.

In S<b>133 , the filtering unit 13 checks whether there is a reference point whose skewness index associated with the reference point is equal to or greater than a threshold. Then, if there is a reference point whose skewness index is greater than or equal to the threshold (Yes), the filtering unit 13 eliminates the reference point whose skewness index is greater than or equal to the threshold in S134. In addition, as described above, it is also possible to perform this step using the degree of strain itself instead of the index. Also, in this process, the smaller the threshold, the more the overlay accuracy in the subsequent process can be improved. In other words, the more the associated reference point with a smaller degree of distortion is used, the more the overlay accuracy is improved.

In S135, the filtering unit 13 confirms whether or not there is an unnecessary attribute reference point. Here, the unnecessary attribute reference point is a brush polygon reference point that is a road, a river, or an unknown section. If there is an unnecessary attribute reference point (Yes), the filtering unit 13 eliminates the unnecessary attribute reference point in S136.

In S137, the filtering unit 13 outputs to the geocoding device 20 the reference point data that has not been removed by the filtering in S131 to S136, in other words, the remaining reference point data. After completion of S137, the process proceeds to S140.

Next, the detailed flow of the geocoding process (S140) in the geocoding device 20 will be described with reference to FIG. FIG. 6 is a flow diagram showing geocoding processing according to the first embodiment. Each operation (step) shown in this flowchart can be executed under the control of the CPU of the geocoding device 20 .

In S141, the geocoding device 20 merges the lot numbers and addresses associated with each reference point acquired from the filtering unit 13 into one column for geocoding processing and optimizes them.

In S142, the geocoding device 20 converts the lot number address into latitude and longitude, and further acquires the residential display of the block of the brush polygon containing the reference point.

In S143, the geocoding device 20 performs second filtering. Specifically, the geocoding device 20 extracts only the reference points of the brush polygons for which the subnumbered address is acquired from the residential display acquired in S142. It should be noted that, here, the address with branch number means the indication of residence time including the branch number attached to the house number when there are a plurality of buildings with the same house number. For example, if there are two or more buildings in 1-chome 2-3, they are written as "1-chome 2-3-1", "1-chome 2-3-2", and so on. Addresses displayed such as "1-chome 2-3-1" and "1-chome 2-3-2" are called subnumbered addresses.

In S144, the geocoding device 20 converts the latitude and longitude coordinates of the section of the brush polygon containing the reference point extracted in S143 into the public coordinate system coordinates.

In S<b>145 , the geocoding device 20 associates the converted public coordinate system coordinates with the reference point, and outputs them to the creation unit 14 . After completion of S145, the process proceeds to S140.

Next, the detailed flow of the overlay processing (S150) will be described with reference to FIG. FIG. 7 is a flowchart showing superimposition processing according to the first embodiment. Each operation (step) shown in this flowchart can be executed under the control of the CPU 54 of the information processing apparatus 10 .

In S151, the creation unit 14 obtains the public coordinate system coordinates of the reference point from the arbitrary coordinate system XY coordinates of the final reference point remaining after the first filtering (S130) and the second filtering (S143). , create a rating point data set in which the arbitrary coordinate system XY coordinates of the reference points are associated with the obtained public coordinate system coordinates.

In S152, the creation unit 14 performs geometric correction using the rating point data set. As a result, each brush polygon group is superimposed on the housing display map.

In S153, the creation unit 14 evaluates the overlay accuracy using RMSE (Root Mean Squared Error). Here, if there is a brush polygon group whose overlay accuracy is equal to or less than the threshold value (S154, Yes), the processing proceeds to S130, and the processing of S130 to S150 is performed for the brush polygon group whose overlay accuracy is lower than the threshold value. repeat. At this time, for example, in S130, the process is performed by changing the threshold value of the area or the threshold value of the degree of distortion. After the first filtering (S130) and the second filtering (S143), the more reference points are left in the end, the more the overlay accuracy can be improved. Then, when the overlay accuracy of all brush polygon groups exceeds the threshold value (S154, No), the process proceeds to S160, and the created map data is output.

As described above, according to the present embodiment, it is possible to superimpose the public map and the housing display map with high accuracy and ease, and it is possible to create a map in which the public map and the housing display map are superimposed with high accuracy. becomes.

In the present embodiment, in S130, the first filtering is performed using the area threshold value and the distortion degree threshold value. may be used to perform the first filtering. Also, for each threshold value and the reference shape, for example, machine learning may be used to derive a value or shape with higher superimposition accuracy. Furthermore, it is preferable to perform the first filtering using both the area threshold value and the skewness threshold value because the superposition accuracy is increased, but only one of them may be used.

In addition, it is preferable to perform the first filtering and the second filtering because the overlay accuracy is improved, but it is also possible to generate the map data only by the first filtering.

Furthermore, in the present embodiment, the information processing device 10 and the geocoding device 20 are different devices, but the information processing device 10 may have the functions of the geocoding device 20 and be integrated into one device. In this case, for example, the information processing device 10 includes a geocoding section having the functions of the geocoding device 20 .

[Second embodiment]
In the second embodiment, machine learning is used to connect brush polygon groups to create a brush polygon group group including a plurality of brush polygon groups. In the present embodiment, the same reference numerals are assigned to the same configurations and steps as those of the first embodiment, and descriptions thereof are omitted, and differences are mainly described.

FIG. 8 is a block diagram showing a schematic configuration of a map generation system 2 according to the second embodiment. An information processing device 80 included in the map generating system 2 includes a brush polygon group creating unit 81 .

The brush polygon group creating unit 81 determines the adjacency relationship from the shapes of the brush polygon groups cut by the splitting unit 11, and joins the brush polygon groups based on the determined adjacency relationship to form a plurality of brush polygon groups. Create a brush polygon group group containing . Creation of brush polygon groups is performed using, for example, machine learning.

FIG. 9 is a flowchart showing map data generation processing according to the second embodiment. In this embodiment, after generating the reference points (S120), a brush polygon group group is created. In S210, the brush polygon group creating unit 81 determines the adjacency relationship from the shapes of the brush polygon groups cut by the splitting unit 11, connects the brush polygon groups based on the determined adjacency relationship, and divides the brush polygon groups into a plurality of groups. Create a brush polygon group group containing a brush polygon group. By performing this process, the superimposing process (S150) can be performed for each brush polygon group group, so it is possible to reduce the load of the superimposing process.

Note that the brush polygon group generation process (S210) may be performed after the brush polygon segmentation process (S110) and after the geometric correction process (S150).

Although preferred embodiments of the present invention have been described above, the present invention is not limited to these embodiments, and various modifications and changes are possible within the scope of the gist thereof. These embodiments and their modifications are included in the scope and gist of the invention, and are included in the scope of the invention described in the claims and equivalents thereof.

1, 2 map generation system 10, 80 information processing device 11 segmentation unit 12 generation unit 13 filtering unit 14 creation unit 15 output unit 20 geocoding device 40 map data

Claims (12)

An information processing device that creates map data,
a dividing unit that divides the Kokuzu polygons into brush polygon groups containing a plurality of brush polygons;
a generation unit that generates a reference point for each of the brush polygons;
a filtering unit that performs first filtering for extracting the reference point based on at least one of the area and the degree of distortion of the brush polygon;
a creation unit that obtains the coordinates of the extracted reference point in a public coordinate system, and superimposes the brush polygon group on a residential map using the public coordinate system coordinates of the reference point to create the map data; An information processing device comprising: 2. The information processing apparatus according to claim 1, wherein the filtering unit extracts reference points where the area or the degree of distortion is equal to or less than a threshold. 2. The information processing apparatus according to claim 1, wherein the filtering unit extracts the reference points whose difference between a shape satisfying a predetermined condition and the shape of the brush polygon is equal to or less than a threshold. 4. The information processing apparatus according to any one of claims 1 to 3, wherein the degree of distortion is calculated based on a ratio between the perimeter of the brush polygon and the area. The generation unit associates attribute data of the brush polygon with the reference point,
5. The information processing apparatus according to any one of claims 1 to 4, wherein the filtering unit excludes the reference points for which the attribute data are roads, rivers, or unknown. further comprising a geocoding unit that obtains the public coordinate system coordinates of the section of the brush polygon that includes the extracted reference point;
6. The information processing according to any one of claims 1 to 5, wherein said creating unit obtains the public coordinate system coordinates of said extracted reference point from the public coordinate system coordinates of the section of said brush polygon. Device. The geocoding unit acquires a residential indication of a section of the brush polygon that includes the reference point subjected to the first filtering, and extracts a reference point for which the acquired residential indication is a subnumbered address. 7. The information processing apparatus according to claim 6, wherein second filtering is performed, and the reference points subjected to the second filtering are output to the creation unit. 8. The geocoding unit according to claim 6, wherein the geocoding unit acquires the latitude and longitude of the parcel based on the parcel address of the parcel, and converts the acquired latitude and longitude into the public coordinate system coordinates. The information processing device described. a step of dividing the kokuzu polygons into brush polygon groups containing a plurality of brush polygons;
generating a reference point for each of the brush polygons;
a first filtering step of extracting the reference point based on at least one of the area and the degree of distortion of the brush polygon;
obtaining the public coordinate system coordinates of the extracted reference points, and using the public coordinate system coordinates of the reference points, superimposing the brush polygon groups on a residential map to create map data. How the data was created. A map data creation system including an information processing device and a geocoding device,
a dividing unit that divides the Kokuzu polygons into brush polygon groups containing a plurality of brush polygons;
a generation unit that generates a reference point for each of the brush polygons;
a filtering unit that performs first filtering for extracting the reference point based on at least one of the area and the degree of distortion of the brush polygon;
a geocoding unit that obtains the public coordinate system coordinates of the section of the brush polygon that includes the extracted reference point;
The public coordinate system coordinates of the reference point are obtained from the public coordinate system coordinates of the brush polygon section, and using the public coordinate system coordinates of the reference point, the brush polygon group is superimposed on the residential map to generate map data. A map data creation system comprising: a creating unit for creating; A program for causing a computer to function as the information processing apparatus according to any one of claims 1 to 8. Map data created by using the information processing apparatus according to any one of claims 1 to 8, the map data creating method according to claim 9, or the map data creating system according to claim 10.

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