JP2013228701A - Map mesh data generation system and mesh data generation method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a map mesh data generation system and a mesh data generation method which are capable of efficiently and appropriately generating mesh data and generating mesh data effectively available as statistical data.SOLUTION: In the mesh data generation system and the mesh data generation method, Voronoi regions are generated within administrative boundaries in accordance with point information of basic unit block data based on a census or the like, and first analogized statistic data corresponding to statistic items of statistic data of administrative boundaries is generated per Voronoi region on the basis of the static data of administrative boundaries and basic statistic data of basic unit blocks, and further, user-defined second analogized statistic data is generated, and the generated first and second analogized statistic data and the statistic data of basic unit blocks are aggregated to generate mesh data per mesh. If a part of a Voronoi region is not included in a mesh, statistic data of the Voronoi region in the mesh is proportionally divided and used as mesh data.

Description

  The present invention relates to a method of generating arbitrary mesh data on a map from statistical data, and in particular, efficiently using mesh data using GIS (Geographic Information System) technology using basic unit area data (point information). The present invention relates to a mesh data generation system and a mesh data generation method on a map that can be generated appropriately and appropriately.

[Conventional technology]
Conventionally, when estimating basic unit area data (point information) to area data, it is necessary to consider the relationship between mesh area and point information in order to add point information to mesh data of arbitrary surface information. In addition, mesh data that simply aggregates point information has been generated.
Specifically, point information in statistical data such as the national census has fewer statistical items than statistical data in the administrative community, and even if they are simply aggregated for each mesh data, they should be used as sufficient statistical data. I can't.

[Related technologies]
In addition, as related prior art documents, there is JP-A No. 2004-118853 “Detailed Statistical Data Creation Method, Program and Device” (ITOCHU Techno-Science Corporation) [Patent Document 1].
In Patent Document 1, the coordinates on the map data corresponding to the telephone number are acquired as telephone number points, and the telephone number points counted for each first section and the second subordinate concept from the first section It is described that a distribution coefficient is obtained based on the collected telephone number points, and is distributed to the statistical data for each first division by the distribution coefficient to obtain statistical data for each second classification.

JP 2004-118853 A

  However, in the above conventional mesh data generation method, when the point information is estimated as area data, it is necessary to consider the relationship between the mesh area and the point information, and the point information is accurately converted into mesh data of arbitrary surface information. However, if mesh data is generated simply by summing up point information, it cannot be used effectively as statistical data, and mesh data that can be used properly and effectively cannot be generated. was there.

  In Patent Document 1, since telephone numbers are used, in recent years, households that do not include telephone numbers in the telephone directory, and more households that do not have fixed telephones but only mobile phones, have increased the accuracy of mesh data. It cannot be improved.

  The present invention has been made in view of the above circumstances, and when estimating basic unit area data (point information) to area data, a Voronoi region is generated based on the coordinates of the basic unit area data and included in the mesh. Mesh data generation system on a map and mesh data generation method capable of generating mesh data that can be efficiently and properly generated by summarizing basic unit data for each Voronoi region by area apportionment and can be effectively used as statistical data The purpose is to provide.

  The present invention for solving the problems of the conventional example is a mesh data generation system for generating mesh data of an arbitrary mesh size, a map information storage unit for storing map information, statistical data of administrative boundaries, A statistical data storage unit that stores basic statistical data and coordinate data of the basic unit ward, and a control unit that performs processing, and as means realized by the control unit, reads map information from the map information storage unit, and stores statistical data Voronoi area generation means for reading the coordinate data of the basic unit area from the map, placing the points of the coordinate data on the map information, and generating Voronoi areas based on the points for each administrative boundary, and Voronoi in the mesh for each mesh unit If the entire region is included, the basic statistical data of the basic unit area of the Voronoi region is aggregated, and a part of the Voronoi region in the mesh In the case where not included, aggregates and basic statistics data area apportioning the basic unit District of the Voronoi region, and having a mesh data generating means for generating mesh data of the mesh.

  The present invention includes a server that generates mesh data of an arbitrary mesh size, and is a mesh data generation system that is accessed from a client terminal via a network, and the server stores a map information storage unit that stores map information; A statistical data storage unit that stores statistical data of administrative boundaries, basic statistical data of basic unit wards and coordinate data, and a control unit that performs processing, and as a means realized by the control unit, map information from the map information storage unit A Voronoi region generating means for reading the coordinate data of the basic unit ward from the statistical data storage unit, placing the points of the coordinate data on the map information, and generating a Voronoi region based on the points for each administrative boundary, and a mesh When the entire Voronoi region is included in the mesh, the basic statistical data of the basic unit area of the Voronoi region is aggregated, If some of the Voronoi regions in the mesh are not included in the mesh, mesh data generation that generates the mesh data of the mesh by dividing the area of the basic statistical data of the basic unit area of the Voronoi region Means.

  According to the present invention, in the mesh data generation system, the Voronoi region generation means reads the statistical data of the administrative boundary and the basic statistical data of the basic unit ward from the statistical data storage unit, and the statistical data of the administrative boundary and the basic statistical information of the basic unit ward Based on the data, first analogical statistical data corresponding to statistical items of statistical data of the administrative boundary is generated and stored in association with the Voronoi region, and the mesh data generating means stores the Voronoi region included in the mesh in units of meshes. The basic statistical data of the basic unit area and the first analogy statistical data are aggregated to generate mesh data of the mesh.

  According to the present invention, in the mesh data generation system, the Voronoi region generation means is based on the statistical data of the administrative boundary and the basic statistical data of the basic unit area, or based on the basic statistical data and the first analogy statistical data, or The user-defined second analogy statistical data is generated based on the statistical data of the administrative boundaries, basic statistical data, and the first analogy statistical data and stored in association with the Voronoi region. The basic statistical data of the basic unit section of the Voronoi region included therein, the first analogy statistical data, and the second analogy statistical data are aggregated to generate mesh data of the mesh.

  The present invention is characterized in that, in the mesh data generation system, the mesh data generation means displays the meshes in different colors according to the aggregated mesh data.

  In the mesh data generation system according to the present invention, when the Voronoi region generation means displays the Voronoi region on the map information, the basic statistical data of the basic unit section of the Voronoi region, the first analogy statistical data, or the second Color-coded display is output based on analogy statistical data.

  The present invention is characterized in that, in the mesh data generation system, the control unit switches between displaying the Voronoi region on the map information and displaying the mesh data.

  According to the present invention, in the mesh data generation system, when the Voronoi region generation means generates the first analogy statistical data or the second analogy statistical data, if a decimal number is generated, the integer part and the decimal part are separated. In the range of the number obtained by subtracting the total number of integer parts from the original total number, rounding is performed by adding and assigning “1” to the integer part in descending order of the decimal part.

  In the mesh data generation system according to the present invention, when the decimal number is generated when the mesh data generation means performs the apportionment of the area, the integer part is separated from the decimal part, and the total number of the integer part from the original total number In the range of the number obtained by subtracting, rounding processing is performed in which “1” is added to the integer part and assigned in descending order of the decimal part.

  According to the present invention, in the mesh data generation system, when the Voronoi region generation means generates the first analogy statistical data or the second analogy statistical data, if a decimal number is generated, the integer part and the decimal part are separated. The first random number is generated within the range of the number obtained by subtracting the total number of the integer part from the original total number, and the first random number corresponds to the corresponding decimal part in the array in which the decimal parts are arranged. Within the range of numbers obtained by adding “1” to the integer part, excluding the decimal part corresponding to the assigned integer part from the array, and subtracting the numeric value of the excluded decimal part from the number within the range. A second random number is generated, and rounding is performed by adding and assigning “1” to the integer part corresponding to the decimal part corresponding to the second random number in the excluded array.

  In the mesh data generation system according to the present invention, when the decimal number is generated when the mesh data generation means performs the apportionment of the area, the integer part is separated from the decimal part, and the total number of the integer part from the original total number A first random number is generated within a range of numbers obtained by subtracting and assigning by adding “1” to the integer part corresponding to the decimal part corresponding to the first random number in the array in which the decimal parts are arranged, In the excluded array, a second random number is generated within the range of numbers obtained by subtracting the decimal part corresponding to the assigned integer part from the array, and subtracting the numerical value of the excluded decimal part from the number within the range. A rounding process in which “1” is added and assigned to the integer part corresponding to the decimal part corresponding to the second random number is performed.

  The present invention is a mesh data generation method for generating mesh data of an arbitrary mesh size, wherein a Voronoi region generation means realized by a control unit reads map information from a map information storage unit, and performs basic data from a statistical data storage unit. The coordinate data of the unit ward is read, the point of the coordinate data is arranged on the map information, the Voronoi region is generated based on the point for each administrative boundary, and the mesh data generation means realized by the control unit When the entire Voronoi area is included in the mesh, the basic statistical data of the basic unit area of the Voronoi area is aggregated, and when a part of the Voronoi area in the mesh is not included in the mesh, the Voronoi area The basic statistical data of the basic unit section is divided and tabulated to generate mesh data of the mesh.

  According to the present invention, in the mesh data generation method, the Voronoi region generation means reads the statistical data of the administrative boundary and the basic statistical data of the basic unit ward from the statistical data storage unit, and the statistical data of the administrative boundary and the basic statistical information of the basic unit ward Based on the data, first analogical statistical data corresponding to statistical items of statistical data of the administrative boundary is generated and stored in association with the Voronoi region, and the mesh data generating means stores the Voronoi region included in the mesh in units of meshes. The basic statistical data of the basic unit area and the first analogy statistical data are aggregated to generate mesh data of the mesh.

  According to the present invention, in the mesh data generation method, the Voronoi region generation means is based on the statistical data of the administrative boundary and the basic statistical data of the basic unit area, or based on the basic statistical data and the first analogy statistical data, or The user-defined second analogy statistical data is generated based on the statistical data of the administrative boundaries, basic statistical data, and the first analogy statistical data and stored in association with the Voronoi region. The basic statistical data of the basic unit section of the Voronoi region included therein, the first analogy statistical data, and the second analogy statistical data are aggregated to generate mesh data of the mesh.

  According to the present invention, a map information storage unit that stores map information, a statistical data of administrative boundaries, a basic statistical data of basic unit wards, a statistical data storage unit that stores coordinate data, and a control unit that performs processing are provided. The Voronoi region generating means realized by the control unit reads the map information from the map information storage unit, reads the coordinate data of the basic unit ward from the statistical data storage unit, arranges the points of the coordinate data on the map information, When the Voronoi region is generated based on the point for each boundary, and the mesh data generating unit includes the entire Voronoi region in the mesh unit, the basic statistical data of the basic unit section of the Voronoi region is aggregated, If a part of the Voronoi region in the mesh is not included in the mesh, the basic statistical data of the basic unit area of the Voronoi region is divided by area and tabulated. Since the mesh data generating system for generating a shoe of mesh data, there is efficient and correctly generate can be effectively mesh data.

  According to the present invention, the Voronoi region generating means reads the statistical data of the administrative boundary and the basic statistical data of the basic unit ward from the statistical data storage unit, and the administrative data based on the statistical data of the administrative boundary and the basic statistical data of the basic unit ward. The first analogy statistical data corresponding to the statistical items of the statistical data of the boundary is generated and stored in association with the Voronoi region, and the mesh data generating means is the basic unit section of the Voronoi region included in the mesh in mesh units. Since the mesh data generation system generates the mesh data of the mesh by collecting the statistical data and the first analogy statistical data, the mesh data that can be effectively used as the statistical data can be generated more efficiently and appropriately. .

  According to the present invention, the Voronoi region generating means is based on statistical data of administrative boundaries and basic statistical data of basic unit wards, or based on basic statistical data and first analogy statistical data, or statistical data of administrative boundaries. The second analogy statistical data defined by the user is generated based on the basic statistical data and the first analogy statistical data and stored in association with the Voronoi region, and the mesh data generating means includes a Voronoi included in the mesh in units of meshes. The mesh data generation system that generates the mesh data of the mesh by collecting the basic statistical data, the first analogy statistical data, and the second analogy statistical data of the region's basic unit ward can be used effectively as statistical data. There is an effect that mesh data can be generated more efficiently and appropriately.

1 is a schematic diagram of a mesh data generation system according to an embodiment of the present invention. It is the schematic of a memory | storage part. It is the schematic of a point information management table. It is the schematic of a mesh data management table. It is the schematic of the correspondence table of a mesh and a Voronoi area | region. It is a figure which shows the dot condition of the basic unit ward data on map data. It is a figure which shows the condition of the Voronoi area | region using the basic unit area data on map data. It is the schematic which distributed the data to 100m mesh. It is a figure which shows a Voronoi area | region. It is the schematic which shows the relationship between a Voronoi area | region and a mesh. It is a table which shows the population according to age of the administrative boundary A, and the population according to age of the Voronoi area. It is a table which shows the gender population with respect to the polygon in a mesh. It is explanatory drawing (1) of another rounding process. It is explanatory drawing (2) of another rounding process. It is explanatory drawing (3) of another rounding process. It is explanatory drawing (4) of another rounding process.

Embodiments of the present invention will be described with reference to the drawings.
[Outline of the embodiment]
A mesh data generation method and a mesh data generation system according to an embodiment of the present invention generate a Voronoi region within an administrative boundary from point information of basic unit ward data based on a national census and the like, and for each Voronoi region, an administrative boundary Based on the statistical data and the basic statistical data of the basic unit ward, generate the first analogical statistical data and the new second analogical statistical data corresponding to the statistical items of the statistical data of the administrative community, and the generated analogical statistical data and basic Aggregate statistical data of unit wards to generate mesh data in mesh units, and if part of the Voronoi region is not included in the mesh, the statistical data of the Voronoi region in the mesh is divided into areas and used as mesh data Therefore, mesh data that can be effectively used as statistical data is efficiently and appropriately generated.

The “Voronoi region” is an area depending on which mother point is close to other points on the same distance space with respect to a plurality of points (mother points) arranged at arbitrary positions on a certain distance space. It is divided. In particular, in the case of a two-dimensional Euclidean plane, the boundary line of the region becomes a part of a bisector for each generating point.
Therefore, although the area | region divided | segmented separately becomes a Voronoi area | region, suppose that the set is called a "Voronoi diagram".

The Voronoi region formula is shown below.

Moreover, in this embodiment, there are basic statistical data in the basic unit ward data obtained from the national census, statistical data of the administrative world, etc. as statistical data, and for each basic unit ward based on the statistical data of the administrative boundary. There is analogical statistical data by analogy. As will be described later, the analogy statistical data includes first analogy statistical data and second analogy statistical data.
The basic unit ward data includes basic statistical data and coordinate data indicating the position of the basic unit ward.

  The basic statistical data of the basic unit ward is, for example, the minimum information in which personal information cannot be specified from the information obtained by the national census, and information obtained in units of about 50 households as point information for each administrative sector. It is what you use. Therefore, there are fewer statistical items in the basic statistical data than statistical items in the statistical data of the administrative community.

Specifically, the basic statistical data of the basic unit ward is statistical data of “total population”, “number of households”, “male population”, and “female population”.
This basic unit ward data (point information) is aggregated into representative points of about 50 households (for example, the barycentric points of those households and having coordinate information), and as aggregated data as representative point attribute data Retained.

Statistical data of administrative boundaries are statistical data compiled by national census for each administrative boundary, and specific statistical items are “population by age (total)” “population by age (male)” “population by age” (Female) ”“ Number of general households with relatives under 6 years old ”,“ Number of general households with relatives over 65 years old ”, and the like.
Further, for example, in the case of “population by age (male)”, the above statistical items are tabulated in detail as “0-4 year old male population”, “5-9 year old male population”, and so on. In the case of “number of general households with relatives under 6”, “number of general households with relatives under 6 years old” “number of relatives with relatives under 6 years old” “number of nuclear family households with relatives under 6 years old”. It is tabulated.

  The analogy statistical data is the statistical data of the administrative boundary, and the statistical data of the administrative boundary is the first analogical statistical data calculated for each Voronoi region that is not the statistical item of the basic statistical data of the basic unit ward. In addition, there is second analogy statistical data in which statistical items not included in the basic statistical data are calculated.

The first analogy statistical data is statistical data corresponding to statistical items of statistical data in the administrative world. For example, “Population by age (total)”, “Population by age (male)”, “Population by age” for each Voronoi region (Female) ".
The second analogy statistical data is statistical data of statistical items arbitrarily set by the user. For example, the OL ratio (the number of women working 15 hours or more and 35 hours or more per week / the female population of 15 years or older), the depopulation rate ( [Number of single persons over 65 years old + number of households only for couples over 65 years old] / number of general households), ratio of applicants for employment (total number of unemployed persons / total population over 15 years old).

[This system: Fig. 1]
A mesh data generation system (this system) according to an embodiment of the present invention will be described with reference to FIG. FIG. 1 is a schematic diagram of a mesh data generation system according to an embodiment of the present invention.
As shown in FIG. 1, the present system is realized by a computer, and basically includes a control unit 11, a storage unit 12, and an interface unit 13, and the interface unit 13 includes a display unit 14. Are connected to the input unit 15 and can be connected to a network.

  In this system, the case of a single computer is described. However, the computer is arranged as a server on the network, and is accessed from a terminal device via the network to perform the characteristic processing of the embodiment. It may be.

[Configuration of Storage Unit 12: FIG. 2]
Next, the configuration of the storage unit 12 will be described with reference to FIG. FIG. 2 is a schematic diagram of the storage unit.
As shown in FIG. 2, the storage unit 12 includes a map information storage unit 12a for storing map information, and statistical data such as basic unit ward data (point information) and administrative statistical data (eg, national census statistical data). And the like, a statistical data storage unit 12b that stores information, a Voronoi region information storage unit 12c that stores information about Voronoi regions, and a mesh data storage unit 12d that stores mesh data.

The storage unit 12 stores a processing program for realizing the processing in the present system, and further stores tables, data, and the like necessary for the processing.
As will be described later, the table includes a point information management table, a mesh data management table, a correspondence table between meshes and Voronoi regions, and the like.

  The map information storage unit 12a stores map information (map data), and holds coordinate information as an attribute for the map data. Further, in the map data, the administrative boundary area is divided and managed by coordinate data.

  The statistical data storage unit 12b stores statistical data for each administrative boundary in addition to the basic unit ward data. As for the basic unit area data, basic statistical data and coordinate information of the center of gravity (coordinate data of the basic unit area) are stored in the statistical data storage unit 12b.

  The information about the Voronoi area stored in the Voronoi area information storage unit 12c is information that defines the Voronoi area by coordinates or the like corresponding to the ID of the Voronoi area. The basic unit ward data is associated with the information related to the Voronoi region by the ID of the basic unit ward and stored in the Voronoi region information storage unit 12c.

  The mesh data stored in the mesh data storage unit 12d is stored as a mesh data management table, information (mesh region information) that defines the mesh region by coordinates or the like with respect to the mesh number (or mesh ID), and mesh attributes As information, statistical data such as the population in the mesh, the number of households, and the population by gender are stored. This statistical data includes analog statistical data in mesh units.

[Point information management table: FIG. 3]
The point information management table will be described with reference to FIG. FIG. 3 is a schematic diagram of the point information management table.
The point information management table associates basic unit ward data with Voronoi regions, and further associates first analogy statistical data and second analogy statistical data with Voronoi regions.
As shown in FIG. 3, the point information management table includes “coordinates” “corresponding Voronoi region ID” for each identifier (ID) of the basic unit ward, “population” “number of households” “male population” in the basic unit ward. "Women's population" (basic statistical data of basic unit wards), and the first analogy statistical data corresponding to the statistical data of the administrative community are "population by age (total)""population by age (male)""population by age" For example, “OL ratio”, “depopulation ratio”, and the like are stored as second analogy statistical data arbitrarily defined by the user.

In the point information management table generation method, the control unit 11 refers to the statistical data storage unit 12b to read the basic unit ward data, and the “basic unit ward ID”, its “coordinate information”, and “population” “ Set the number of households, “male population” and “female population”.
Next, the control unit 11 reads information about the Voronoi region with reference to the Voronoi region storage unit 12c, and sets the ID of the Voronoi region corresponding to the basic unit ward ID.

  Further, the control unit 11 reads the statistical data of the administrative boundary including the basic unit ward with reference to the statistical data storage unit 12b, and calculates the statistical data of the items not included in the basic statistical data as the area of the Voronoi region with respect to the area of the administrative boundary. An arithmetic operation is performed by proportional distribution, and is set in the point information management table as first analogy statistical data.

  Further, the control unit 11 calculates, based on basic statistical data, administrative boundary statistical data, and first analogy statistical data, for statistical items arbitrarily defined by the user, and stores them in the point information management table as second analogy statistical data. Set.

[Mesh data management table: FIG. 4]
Next, the mesh data management table will be described with reference to FIG. FIG. 4 is a schematic diagram of the mesh data management table.
In the mesh data management table, a mesh area is defined for each mesh area, and statistical data is stored in association with the area of the mesh.
In the mesh data management table, as shown in FIG. 4, the mesh area is assigned to a mesh number (mesh No. [may be a mesh identifier]) assigned to a mesh set to an arbitrary size. “Population”, “Number of households”,... “Population by age” and the like are set as mesh region information that defines the coordinates by coordinates and the like, and statistical data in the mesh.

  For example, when a 100 m × 100 m mesh (100 m mesh) is set, the control unit 11 reads target map data from the map information storage unit 12a, superimposes the mesh on the map data, and sets the mesh coordinates. The mesh number is specified in the mesh data management table. The mesh area information is set while assigning.

For the statistical data of the mesh, the control unit 11 refers to the point information management table for the basic unit section included in the mesh, and for the statistical items of the basic statistical data, the first analogy statistical data, and the second analogy statistical data, It is the total in units.
If the Voronoi area of the basic unit area is 100% included in the mesh, the statistical data relating to the basic unit area may be added up. However, if a part of the Voronoi area is not included in the mesh, the mesh line The Voronoi regions divided in (1) are apportioned in the area, the statistical data of the basic unit section is recalculated according to the apportioned ratio, and the statistical data are added up.
Further, for the statistical data in the mesh, new statistical data (third analogy statistical data) is generated based on the basic statistical data, the first analogy statistical data, and the second analogy statistical data according to the definition of the user. You may make it set to a mesh data management table.

[Mesh and Voronoi area correspondence table: Fig. 5]
A correspondence table between meshes and Voronoi regions will be described with reference to FIG. FIG. 5 is a schematic diagram of a correspondence table between meshes and Voronoi regions.
As shown in FIG. For each (or mesh ID), a Voronoi region ID included in the mesh and a ratio in which the Voronoi region is included in the mesh are set. The “ratio” is used to apportion the area of the Voronoi region.

[Processing content of this system]
[Processing means]
In the present system, Voronoi region generating means and mesh data generating means are provided as function realizing means for the control section 11 to read the processing program in the storage section 12 and execute the processing. Hereinafter, each means will be described.

[Voronoi region generation means: FIGS. 6 and 7]
The processing contents of the Voronoi region generation means will be described with reference to FIGS. FIG. 6 is a diagram illustrating a situation where basic unit ward data is scattered on map data, and FIG. 7 is a diagram illustrating a situation of Voronoi regions using the basic unit ward data on map data.

  As shown in FIG. 6, the Voronoi region generation means reads the map data of the corresponding area from the map information storage unit 12a to form the first layer, and sets the coordinate data of the basic unit area of the corresponding area as the statistical data storage unit 12b. Is read to form a second layer of basic unit area data (point information), and the point information is arranged on the map data by overlapping the first layer and the second layer.

Next, the Voronoi region generating means generates a Voronoi diagram by generating a boundary line for identifying the Voronoi region for a plurality of arranged points (base points) as shown in FIG. The Voronoi diagram is generated in the area of the town street.
The Voronoi diagram information generated as described above (Voronoi diagram boundary coordinate data and the like) is associated with the Voronoi region ID and stored in the Voronoi region information storage unit 12c.

The Voronoi region generating means sets the basic unit ward ID, its coordinate information, and basic statistical data of the basic unit ward in the point information management table when placing the point information on the map data.
Then, the Voronoi region generating means sets a Voronoi region ID corresponding to the basic unit area after generating the Voronoi diagram, and corresponds to the statistical data of the administrative boundary based on the statistical data of the administrative boundary and the basic statistical data of the basic unit section. Analogize statistical data. This is the “first analogy statistical data”, and the Voronoi region generation means sets it in the point information management table.

For example, in the statistical data of the administrative world, there is statistical data of population by age, but basic statistical data of basic unit ward has statistical data of population, but there is no statistical data of population by age, population by age This statistical data becomes the first analogy statistical data.
In this case, the Voronoi region generating means generates statistical data on the age-specific population of the Voronoi region by analogy with the ratio of the area of the Voronoi region to the area of the administrative boundary and the population of the Voronoi region.
Further, the Voronoi region generating means generates statistical data arbitrarily defined by the user that is not in the statistical data of the administrative boundary based on the basic statistical data of the basic unit ward, the statistical data of the administrative boundary, and the first analogy statistical data, The second analogy statistical data is set in the point information management table.

  It is not necessary to display the Voronoi diagram which is an intermediate product. However, when using statistical information using the Voronoi diagram, the Voronoi region in the Voronoi diagram should be displayed in different colors according to the attributes of the statistical data. Also good. Thereby, the status of statistical data can be easily recognized by color for each Voronoi region.

[Mesh data generation means: FIG. 8]
Next, mesh data generation means will be described with reference to FIG. FIG. 8 is a schematic diagram in which data is distributed to 100 m mesh.
The mesh data generation means generates a mesh diagram of a size desired by the user (for example, 100 m × 100 m mesh [100 m mesh]) and superimposes it on another layer (third layer) on the Voronoi diagram.

Next, the mesh data generating means aggregates statistical data (basic statistical data, first analogical statistical data, and second analogical statistical data) of the Voronoi region included in each mesh with reference to the point information management table. Set in the mesh data management table.
When a part of the Voronoi region is included in the mesh, the mesh data generating means apportions the area of the Voronoi region delimited by the boundary line of the mesh, and also distributes the statistical data according to the apportioning ratio to generate the mesh. And is set in the mesh data management table.

  Then, the mesh data generating means displays the map data of the first layer and the mesh data of the third layer on the display unit 14 so as to overlap each other. As shown in FIG. 8, when displaying map / mesh data, meshes may be displayed in different colors based on statistical data aggregated for each mesh.

The mesh data generation means stores the mesh data generated in this way in the mesh data storage unit 12d.
The mesh data includes statistical data in units of meshes and color information based on the statistical data. The mesh color is highly convenient if a transparent color (translucent color) is used so that the map data of the lower layer can be easily seen.

Further, the mesh data generating means may switch between the display of the map / mesh data and the map / Voronoi diagram.
Specifically, the mesh data generating means displays the map data of the first layer and the mesh data of the third layer so as to overlap each other, and according to the switching instruction, the map data of the first layer and the Voronoi of the second layer are displayed. This is realized by displaying the figures in an overlapping manner.

[Relationship between administrative world and Voronoi area: Fig. 9]
Next, the relationship between administrative boundaries and Voronoi regions will be described with reference to FIG. FIG. 9 is a diagram illustrating a Voronoi region.
As shown in FIG. 9, Voronoi regions A1 to A4 are formed in the administrative boundary A based on the coordinates of the basic unit ward, and the population in each Voronoi region is obtained from the basic statistical data of the basic unit ward. It is done.
In addition to the population, basic statistical data, first analogy statistical data, and second analogy statistical data can be obtained by referring to the point information management table.

[Relationship between Voronoi region and mesh: Fig. 10]
Next, the relationship between the Voronoi region and the mesh will be described with reference to FIG. FIG. 10 is a schematic diagram showing the relationship between Voronoi regions and meshes.
When the Voronoi region completely fits within one mesh, the statistical data of the Voronoi region can be taken into the mesh and used, but a part of the Voronoi region is outside the mesh as shown in FIG. In this case, the statistical data needs to be distributed and adjusted according to the distribution of the area inside and outside the mesh of the Voronoi region. A specific adjustment method will be described later.

[First analogical statistical data generation in Voronoi region: FIG. 11]
Next, point information in the Voronoi region has fewer statistical items to be published than statistical data to be published in administrative boundaries from the viewpoint of protecting personal information because the population and the number of households are small.
Therefore, in this system, similar types (items) of statistical data (first analog statistical data) are generated by analogy in the Voronoi region based on statistical data in administrative boundaries. The analogy process may be executed by the Voronoi region generating means, or may be executed by another realizing means by the control unit 11.

The generation of statistical data in the Voronoi region will be described with reference to FIG. FIG. 11 is a table showing the age-specific population of the administrative boundary A and the age-specific population of the Voronoi region.
Here, in the statistical data of administrative boundaries, the population by age is published, but in the Voronoi region, the population by age is not published. Therefore, a method for calculating the age-specific population of the Voronoi region from the age-specific population of the administrative world will be described.

The administrative boundary A in FIG. 10 holds attribute information that the Voronoi region A1 has a population of 100, the Voronoi region A2 has a population of 120, the Voronoi region A3 has a population of 50, and the Voronoi region A4 has a population of 130. Yes. That is, the administrative community A has a population of 400.
Then, the population ratio of Voronoi region A1 to administrative boundary A is “1/4”, the population ratio of Voronoi region A2 is “3/10”, and the population ratio of Voronoi region A3 is “13/40”. The population ratio of the Voronoi region A4 is “1/8”.

  Assuming that the age group of “0-4” in the administrative world A is “10”, the population by age of “0-4” in the Voronoi region A1 is 2.5 according to the population ratio ( The population by age of “0-4” in the Voronoi region A2 is 3 (10 people × 3/10),... According to the population ratio.

  Similarly, if the “5-9” age group in the administrative world A is “12”, the “5-9” age group population in the Voronoi region A1 is determined according to the population ratio. Three people (12 people x 1/4), the population by age of "5-9" in the Voronoi area A2 is 3.6 people (12 people x 3/10), ... depending on the population ratio .

When the above calculation is performed, the population may not be an integer. For example, the population by age of “0-4” in the Voronoi region A1 is 2.5, and the population by age of “5-9” in the Voronoi region A2 is 3.6.
In this case, if the decimal point is simply rounded to an integer, it may not match the integer in the administrative world. This will be briefly described below with another example.

[Another example]
For example, the composition ratios of “minor”, “adult”, “elderly”, and “unknown age” are “0.103”, “0.693”, “0.202”, “0.002”, respectively, and the population in a specific area is “8”. "People".
When calculating the population by age, minors: 0.824 (= 8 × 0.013), adults: 5.544 (= 8 × 0.693), elderly: 1.616 (= 8 × 0.202), age unknown: 0.016 (= 8 × 0.002).
Here, when rounding is performed, minors: 1 adult: 6 adults: 2 elderly people: 2 unknown age: 0 people, and a total of 9 people, which does not match the population of “8 people” in the area. That is, a rounding error occurs.

Therefore, a calculation method in which the above mismatch does not occur will be described below.
The value including the decimal point of the calculation result is separated into an integer part and a decimal part. “0” and “0.824” for minors, “5” and “0.544” for adults, “1” and “0.616” for elderly people, “0” for unknown age ”And“ 0.016 ”.
Then, the sum of only the integer part is “6”, and the difference from the original population “8” is “2”.

Next, sort in descending order of decimal part, in order of “0.824” (Minor), “0.616” (Old), “0.544” (Adult), “0.016” (Unknown age) And
Then, the difference “2” is set to “+1” in the descending order of the decimal part, “+1”, and the third and subsequent numbers are set to “0”.
As a result, minors: 1, adults: 5, elderly people: 2, age unknowns: 0, totaling “8”, the same as the original population of “8”.

Thus, when the number of people includes a decimal point, it is separated into an integer part and a decimal part, the decimal part is rearranged in descending order, and the difference value obtained by subtracting the total of the integer part from the original total is incremented by “+1”. Distribute in descending order. This rounding process does not cause a rounding error.
In the calculation processing of the population according to age in FIG.

[Gender population for polygons in mesh: Fig. 12]
Next, the male and female population for polygons in the mesh will be described with reference to FIG. FIG. 12 is a table showing the gender population for the polygons in the mesh.
As shown in FIG. 12, since the Voronoi regions A1 and A2 are all included in the mesh, the area apportionment is 100%, and the Voronoi regions A3 and A4 are partially included in the mesh. Suppose that they are 60% and 45%.
For the area apportionment, the apportioning ratio is calculated by calculating the area of the figure divided by the boundary line of the mesh.

Assuming that the total male population of Voronoi region A3 is 24 and the female population is 26 (30 people in total), the male population of Voronoi region A3 in the mesh is “14.4 people” (= 24 × 0. 6) The female population is “15.6 people” (= 26 × 0.6).
Similarly, the male population of the Voronoi region A4 in the mesh is “27.9” (= 62 × 0.45), and the female population is “30.6” (= 63 × 0.45).

  Here, when the male and female populations include decimal points due to area apportionment, the male and female populations of the other Voronoi region separated by the mesh are also calculated, and this region also includes decimal points, so it is divided. Between the Voronoi regions, as described above, the integer part and the decimal part are separated, the decimal part is rearranged in descending order, and the difference value obtained by subtracting the total of the integer part from the original sum is incremented by “+1”. Rounding processing may be performed to distribute in descending order.

As a result, as shown in FIG. 12, the male population in the Voronoi region A3 in the mesh is “14” and the female population is “16”. Similarly, the male population of the Voronoi region A4 in the mesh is “28” and the female population is “31”.
In this case, the rounding process may be executed by the mesh data generation means, or may be executed by another realization means by the control unit 11.

[Another rounding]
In the rounding process described above, the integer part and the decimal part are separated, the decimal part is rearranged in descending order, and the difference value obtained by subtracting the total of the integer part from the original sum is distributed by “+1” in descending order of the decimal part. However, in this case, when the value of the decimal part is small, it is not incremented by “+1”, and there is a problem that the rounding process is biased.

[Calculation result: FIG. 13]
Therefore, in another rounding process described below, even if the value of the decimal part is small, it is “+1” with a small bias. Another rounding process will be described with reference to FIGS. FIG. 13 is an explanatory diagram (1) of another rounding process.
In addition, another rounding process is performed by the Voronoi region generation means when a decimal number is generated when the first analog statistical data or the second analog statistical data is generated, and a decimal number is generated when the area is divided. In this case, it is performed by the mesh data generation unit, but may be performed by another unit.

As shown in FIG. 13, the calculation results including the decimal point are shown for the items “minor”, “adult”, “elderly”, and “age unknown”, and the total is “8”. Divided into fractional parts.
Then, in order to determine the item to be “+1”, the size of each decimal part is determined using a random number, considering the probability that an additional 1 exists therein.

[First +1 item determination: FIG. 14]
Specifically, a random number is generated within a range of a pass value (“2” in FIG. 14) obtained by adding the decimal values of the items. If the random number is “1.234”, it is sequentially determined which item position the random number corresponds to. FIG. 14 is an explanatory diagram (2) of another rounding process.
In FIG. 14, whether the random number “1.234” is included in the decimal value of the item “Minor” is compared, and 1.234 (random number)> 0.824 (decimal value of “Minor”). Therefore, the random number is not included in the decimal value of “Minor”.

  Next, the decimal value “0.824” of “Minor” is subtracted from the random number “1.234” to calculate the subtraction value “0.410”, and the decimal value “0.544” of the item “Adult” is obtained. Compare. Since 0.410 (random number subtraction value) <0.544 (decimal value of “adult”), the random number subtraction value is included in the decimal value of “adult”, and the first “+1” is added. Item is determined to be “adult”.

[Second item +1 determination: Fig. 15]
As shown in FIG. 13, since the sum of the decimal parts is “2”, the second determination of the item to be “+1” is performed. The second “+1” item determination will be described with reference to FIG. FIG. 15 is an explanatory diagram (3) of another rounding process.
As shown in FIG. 15, the same processing as described above is performed except for the item determined at the first time. Second, since the sum of the decimal parts of the target item is “1.456”, the random number is generated in the range of “0” to “1.456”.

  Here, for example, if the random number “0.666” is generated, it is compared with the decimal value of the item “Minor” and 0.666 (random number) <0.824 (the decimal value of “Minor”). Thus, the random number is included in the decimal value of “Minor”, and the second “+1” item is determined as “Minor”.

[Final result: Fig. 16]
By the above rounding process, two items to be “+1” are determined, and the final result as shown in FIG. 16 is obtained. FIG. 16 is an explanatory diagram (4) of another rounding process.
As shown in FIG. 16, the item “Minor” is “+1” and the item “Adult” is “+1”.
Thus, since the additional part to be “+1” is determined using the value of the decimal part as a probability, it can be expected that the bias due to the rounding process can be reduced. If the same process is repeated in large quantities, the average value converges to the original decimal value.

[Effect of the embodiment]
According to this system, when estimating basic unit ward data (point information) to area data (mesh data), a Voronoi area is generated in the administrative boundary based on the coordinates of the basic unit ward, and statistical data of the administrative boundary First and second analogy statistical data is generated for each Voronoi region according to the area ratio of the Voronoi region to the area of the administrative boundary based on the basic statistical data of the basic unit ward, and the generated analogy statistical data and the basic The statistical data of the unit wards is aggregated and generated as mesh data in mesh units. When the Voronoi region is divided by the boundary of the mesh, the statistical data is adjusted according to the area apportionment. As a result, mesh data that can be effectively used can be generated efficiently and appropriately.

  INDUSTRIAL APPLICABILITY The present invention is suitable for a mesh data generation system and a mesh data generation method on a map that can generate mesh data efficiently and appropriately and can generate mesh data that can be effectively used as statistical data.

  DESCRIPTION OF SYMBOLS 11 ... Control part, 12 ... Storage part, 12a ... Map information storage part, 12b ... Statistical data storage part, 12b ... Statistical data storage part, 12c ... Voronoi area information storage part 12d ... mesh data storage unit, 13 ... interface unit, 14 ... display unit, 15 ... input unit

Claims (14)

A mesh data generation system for generating mesh data of an arbitrary mesh size,
A map information storage unit that stores map information, a statistical data of administrative boundaries, a statistical data storage unit that stores basic statistical data and coordinate data of basic unit wards, and a control unit that performs processing;
As means realized by the control unit,
The map information is read from the map information storage unit, the coordinate data of the basic unit ward is read from the statistical data storage unit, the points of the coordinate data are arranged on the map information, and the Voronoi based on the points for each administrative boundary. Voronoi region generating means for generating a region;
When the entire Voronoi region is included in the mesh unit, the basic statistical data of the basic unit area of the Voronoi region is aggregated, and when a part of the Voronoi region in the mesh is not included in the mesh, A mesh data generation system comprising: mesh data generation means for generating basic mesh data of the mesh by dividing the basic statistical data of the basic unit section of the Voronoi region by dividing the area. A mesh data generation system comprising a server that generates mesh data of an arbitrary mesh size and accessed from a client terminal via a network,
The server includes a map information storage unit that stores map information, statistical data of administrative boundaries, basic statistical data of basic unit wards and statistical data storage unit that stores coordinate data, and a control unit that performs processing,
As means realized by the control unit,
The map information is read from the map information storage unit, the coordinate data of the basic unit ward is read from the statistical data storage unit, the points of the coordinate data are arranged on the map information, and the Voronoi based on the points for each administrative boundary. Voronoi region generating means for generating a region;
When the entire Voronoi region is included in the mesh unit, the basic statistical data of the basic unit area of the Voronoi region is aggregated, and when a part of the Voronoi region in the mesh is not included in the mesh, A mesh data generation system comprising: mesh data generation means for generating basic mesh data of the mesh by dividing the basic statistical data of the basic unit section of the Voronoi region by dividing the area. The Voronoi region generating means reads the statistical data of the administrative boundaries and the basic statistical data of the basic unit ward from the statistical data storage unit, and based on the statistical data of the administrative boundaries and the basic statistical data of the basic unit ward, Generating first analogy statistical data corresponding to the statistical items of the data, storing them in association with the Voronoi region,
The mesh data generation means generates the mesh data of the mesh by aggregating the basic statistical data of the basic unit area and the first analogy statistical data of the Voronoi region included in the mesh in mesh units. The mesh data generation system according to claim 1 or 2. The Voronoi region generating means is based on the statistical data of the administrative boundaries and the basic statistical data of the basic unit wards, or based on the basic statistical data and the first analogy statistical data, or the statistical data of the administrative boundaries, the basic statistics Generating user-defined second analogy statistical data based on the data and the first analogy statistical data, storing the data in association with the Voronoi region,
The mesh data generation means aggregates the basic statistical data of the basic unit area of the Voronoi region included in the mesh in mesh units, the first analogy statistical data, and the second analogy statistical data, and mesh data of the mesh The mesh data generation system according to claim 3, wherein:   The mesh data generation system according to any one of claims 1 to 4, wherein the mesh data generation means outputs the meshes in different colors according to the aggregated mesh data.   The Voronoi region generating means, when displaying the Voronoi region on the map information, outputs a color-coded display based on the basic statistical data of the basic unit section of the Voronoi region, the first analogy statistical data, or the second analogy statistical data. The mesh data generation system according to any one of claims 1 to 5.   The mesh data generation system according to claim 6, wherein the control unit switches between the display of the Voronoi region and the display of the mesh data on the map information.   When the Voronoi region generating means generates the first analogy statistical data or the second analogy statistical data, if a decimal number is generated, it separates the integer part and the decimal part, and calculates the integer part from the original total number. 3. The mesh data generation system according to claim 1, wherein rounding is performed by adding and assigning “1” to the integer part in descending order within the range of the number obtained by subtracting the total number. .   The mesh data generation means divides the integer part from the decimal part when the decimal is generated when the area is apportioned, and falls within the range of the number obtained by subtracting the total number of the integer part from the original total number. The mesh data generation system according to claim 1, wherein rounding is performed by adding and assigning “1” to the integer part in descending order of decimal part.   When the Voronoi region generating means generates the first analogy statistical data or the second analogy statistical data, if a decimal number is generated, it separates the integer part and the decimal part, and calculates the integer part from the original total number. A first random number is generated within the range of the number obtained by subtracting the total number, and “1” is added to the integer part corresponding to the decimal part corresponding to the first random number in the array in which the decimal parts are arranged. And assigning a second random number within a range of numbers obtained by subtracting the decimal part corresponding to the assigned integer part from the array and subtracting the numerical value of the excluded decimal part from the number within the range. 3. The mesh according to claim 1, wherein rounding is performed by adding and assigning “1” to an integer part corresponding to a fractional part to which the second random number corresponds in the excluded array. Data generation system.   The mesh data generation means divides the integer part from the decimal part when the decimal is generated when the area is apportioned, and falls within the range of the number obtained by subtracting the total number of the integer part from the original total number. 1 generates a first random number, and assigns “1” to the integer part corresponding to the decimal part corresponding to the first random number in the array in which the decimal parts are arranged, and corresponds to the assigned integer part A second random number is generated within a range of numbers obtained by subtracting a numerical value of the excluded fractional part from a number within the range, and the second number in the excluded array The mesh data generation system according to claim 1, wherein rounding is performed by adding “1” to an integer part corresponding to a decimal part to which the random number corresponds. A mesh data generation method for generating mesh data of an arbitrary mesh size,
The Voronoi region generating means realized by the control unit reads the map information from the map information storage unit, reads the coordinate data of the basic unit section from the statistical data storage unit, and arranges the points of the coordinate data on the map information, Create a Voronoi region based on the point for each administrative boundary,
When the mesh data generating means realized by the control unit includes the entire Voronoi region in the mesh unit, the basic statistical data of the basic unit section of the Voronoi region is aggregated, and one of the Voronoi regions in the mesh is calculated. When the portion is not included in the mesh, the mesh data generation method is characterized in that the basic statistical data of the basic unit section of the Voronoi region is divided and tabulated to generate mesh data of the mesh. Voronoi area generation means reads statistical data of administrative boundaries and basic statistical data of basic unit wards from the statistical data storage unit, and statistical data of administrative boundaries based on statistical data of administrative boundaries and basic statistical data of basic unit wards Generating first analogy statistical data corresponding to the statistical items of the data, storing them in association with the Voronoi region,
The mesh data generating means generates the mesh data of the mesh by adding up the basic statistical data of the basic unit section and the first analogical statistical data of the Voronoi region included in the mesh in mesh units. The mesh data generation method according to claim 12. The Voronoi region generating means is based on the statistical data of the administrative boundaries and the basic statistical data of the basic unit wards, or based on the basic statistical data and the first analogy statistical data, or the statistical data of the administrative boundaries, the basic statistics Generating user-defined second analogy statistical data based on the data and the first analogy statistical data, storing the data in association with the Voronoi region,
The mesh data generating means aggregates the basic statistical data of the basic unit section of the Voronoi region included in the mesh in mesh units, the first analogy statistical data, and the second analogy statistical data, and mesh data of the mesh The mesh data generation method according to claim 13, wherein:

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