JP5107168B2 - Reference airflow field data creation device, method, program, and substance diffusion state prediction system - Google Patents

Description

  The present invention relates to a reference airflow field data creation device, method, program, and material diffusion state prediction system using an airflow field created by a reference airflow field data creation device.

Conventionally, when grasping the diffusion status of air pollutants due to nuclear accidents or accidents at chemical factories, etc., first, atmospheric phenomena are determined based on meteorological observation data such as weather GPV (Grid Point Value) data and AMEDAS. By calculating the partial differential equation to be analyzed, air current elements (wind direction, etc.) at a number of evaluation points at regular intervals over the calculation period from the time of the accident occurrence (for example, external release of radioactive material) to the time ahead of the predetermined time. ) And calculating the diffusion using this air flow element, the diffusion status of the substance released from the accident source is predicted. For example, Japanese Patent Application Laid-Open No. 2007-304080 discloses a technique for preliminarily storing an airflow element used for performing the diffusion calculation in a database.
JP 2007-304080 A

  However, in the invention of the above-mentioned Patent Document 1, since it is necessary for a human to calculate the airflow element and to store the calculation result manually, the process for obtaining the airflow element is complicated, and the calculated airflow element is stored. There is a problem that it takes time to create an airflow database.

  The present invention has been made to solve the above-described problems, and facilitates processing for obtaining an airflow element and shortens the time required to create an airflow database, a method of creating a reference airflow field data, a method, a program, and a reference To provide a substance diffusion state prediction system that predicts a substance diffusion state using an air flow field created by an air flow part data creation device.

In order to solve the above problems, the present invention employs the following means.
The present invention is a reference airflow field data creation device for creating reference airflow field data used in a substance diffusion state prediction device that predicts a diffusion state of a substance in an attention region including a point of interest, and the attention region is input And terrain data extracting means for extracting terrain data in the region of interest; information on a building in the region of interest is extracted; building outline data that is the outline of the building is approximated to a rectangle; An airflow field in a wind direction of a predetermined direction is calculated based on the building rectangle approximate extraction means output as data, the topographic data extracted by the topography data extraction means, and the building data output by the building rectangle approximate extraction means Air flow calculation means, and the building rectangle approximate extraction means is a horizontal sectional shape of the building from the building information in the region of interest. Get the building polygon data which is the contour, the contour setting means as a reference outline one contour line of該建object contour data, the coordinate system for setting an XY orthogonal coordinate system on the map with the building polygon data The building contour data is centered on one end of the reference contour line until one contour line set by the setting means and the contour line setting means is parallel to the X axis or the Y axis of the XY Cartesian coordinate system. A building rotating means for rotating by a predetermined angle; a straight line including all the vertices of the building contour data; each side is in contact with at least one vertex of the building contour data; and a straight line parallel to the reference contour line; the rectangles created by the rectangle forming means and said rectangular creating means for creating a rectangle composed of the straight line and the straight line parallel intersecting at right angles to the reference contour, but the predetermined angle around the end of the reference contour Re-rotating in the reverse direction to return the building to its original position, and the building rotating means and the building re-rotating means rotate the building outline data using a rotation matrix. A characteristic reference airflow field data creation device is provided.

According to such a configuration, the terrain data of the attention area is extracted from the map including the attention area, the building of the attention area is approximated to a rectangle, and the airflow is calculated based on the information. The airflow can be calculated in consideration of the shape of the building and the like. As a result, the result predicted by the substance diffusion state prediction device that predicts the diffusion state of a substance can be predicted closer to reality than the prediction of the diffusion state of a substance when the airflow is calculated without considering the building It becomes.
In addition, the building rectangle approximate extraction means of the present invention creates a rectangle with one outline of the building outline data or a straight line obtained by extending the outline as one side of the rectangle. Therefore, a rectangle that approximates the building outline data is easily created. can do. Thereby, it is possible to shorten the time for approximating the building outline data to a rectangle, and it is possible to reduce the time required to create airflow field data. The regional atmospheric model by the airflow calculation means is, for example, RAMS (Regional Atmospheric Modeling System).
Also, one of the plurality of contour lines constituting the building contour data is used as a reference contour line, and the building contour data is centered on one end of the reference contour line up to a position parallel to the X axis or Y axis of the XY orthogonal coordinate system. Rotate by using a rotation matrix and perform rectangular approximation in this state, so it is possible to easily rotate building outline data of various shapes and easily create rectangles that encompass the vertices of building outline data Become.

  In the reference airflow field data creation device, the contour line setting means uses, as the reference contour line, the longest contour line in which another contour line exists only on one side across the contour line from among the contour lines. It may be set.

  By setting the reference contour in this way, the reference contour or a straight line obtained by extending the reference contour can be used as one side of the rectangle. This makes it possible to easily create a quadrangle that includes other vertices.

  In the reference airflow field data creation device, the rectangle creation means calculates the XY coordinates of all the vertices of the building outline data rotated by the building rotation means, and from these XY coordinates, the maximum value of the X axis and Extracting four XY coordinates having the minimum value and the maximum and minimum values of the Y axis, and creating a rectangle by connecting the extracted four XY coordinates with a straight line parallel to the X axis and a straight line parallel to the Y axis It is good.

  According to such a configuration, the XY coordinates of all the vertices in the building outline data after rotation are obtained, and among the XY coordinates, the minimum value and maximum value of the X coordinate and the minimum value and maximum value of the Y coordinate are determined. Since the four coordinates including each are specified and the rectangle is created by connecting the coordinates, the building can be approximated to the rectangle by a simple algorithm even if the building has a complicated outline.

  The said reference | standard airflow field data preparation apparatus WHEREIN: The said building outline data is good also as having the height data of this building.

  Since the building outline data has height data, it is possible to easily create a simplified three-dimensional shape (cuboid) by sweeping the rectangle created by the rectangle creation means in the height direction. It becomes. Thereby, the situation of a building can be reproduced in more detail.

  In the reference airflow field data creation device, the building data created by the building rectangle approximate extraction unit may be output in a data format that can be directly processed by the airflow calculation unit.

  Since the building data created by the building rectangle approximate extraction means is input to the airflow calculation means and output in a data format that can be processed as it is, it is possible to quickly execute the airflow calculation using the building data. Become.

  In the reference airflow field data creation device, when the airflow field in the wind direction of the predetermined direction calculated by the air flow calculating unit is calculated for all the specified directions, the diffusion state of the substance is predicted. The airflow data may be output to a database used in the harmful substance diffusion device.

  Thus, since the calculated airflow data is automatically output to an external storage device, if there is a device that reads data from the output destination storage device and starts the next operation, the calculated airflow data After the data is output, the next operation can be executed promptly.

  The present invention is a substance diffusion state prediction apparatus that predicts the diffusion state of a substance in an attention area including an attention point, and the reference airflow field created by the reference airflow field data creation apparatus when weather data is input. Provided is a material diffusion state prediction apparatus that extracts reference airflow field data similar to the input weather condition from the data, and predicts the diffusion state of the substance in the region of interest using the reference airflow field data.

  The similar reference airflow field data is reference airflow field data relating to two directions sandwiching the wind direction obtained from weather conditions.

  The present invention provides a substance diffusion state prediction system comprising a database for storing reference airflow field data created by the reference airflow field data creation apparatus and the substance diffusion state prediction apparatus described above.

The present invention is a reference airflow field data creation method for creating reference airflow field data used in a substance diffusion state prediction apparatus for predicting a diffusion state of a substance in an attention region including a point of interest, wherein the attention region is input And extracting the terrain data in the region of interest, extracting information on the building in the region of interest, approximating the building outline data that is the outline of the building to a rectangle, and outputting the approximation result as building data Calculating an airflow field in a wind direction of a predetermined direction based on the terrain data extracted by the process of extracting the terrain data, and the building data output by the process of approximating the building data to a rectangle The process of approximating the building data to a rectangle is the outline of the horizontal cross-sectional shape of the building from the building information in the region of interest Get the object contour data, setting the steps of the reference contour of one of the contour line of該建object contour data, the process of setting an XY orthogonal coordinate system on the map with the building polygon data, the reference contour Rotating the building contour data by a predetermined angle around one end of the reference contour line until one contour line set by the process is parallel to the X axis or Y axis of the XY Cartesian coordinate system; A straight line that includes all the vertices of the building contour data, each side is in contact with at least one vertex of the building contour data, and is parallel to the reference contour line; and a straight line that intersects the reference contour line at right angles By re-rotating the rectangle created by the process of creating a rectangle composed of parallel straight lines and the process of creating the rectangle in the reverse direction by the predetermined angle around one end of the reference contour line, Original A step of rotating the building contour data by a predetermined angle and a step of rotating the rectangle in the reverse direction by the predetermined angle by rotating the building contour data using a rotation matrix. A method of creating reference airflow field data characterized by

The present invention is a reference airflow field data creation program for creating reference airflow field data used in a substance diffusion state prediction apparatus for predicting a diffusion state of a substance in an attention region including a point of interest, and the attention region is input And extracting the terrain data in the region of interest, extracting the building information in the region of interest, approximating the building outline data, which is the outline of the building, to a rectangle, and outputting the approximation result as building data A process for calculating an airflow field in a wind direction of a predetermined direction based on the terrain data extracted by the process of extracting the terrain data, and the building data output by the process of approximating the building data to a rectangle The process of approximating the building data to a rectangle is a contour of a horizontal sectional shape of the building from the information of the building in the region of interest. Get the building outline data, and processing of the reference contour of one of the contour line of該建object contour data, the processing for setting an XY orthogonal coordinate system on the map with the building polygon data, the reference contour Processing for rotating the building contour data by a predetermined angle around one end of the reference contour line until one contour line set by the setting processing is parallel to the X axis or Y axis of the XY orthogonal coordinate system; , Including all vertices of the building contour data, each side being in contact with at least one vertex of the building contour data, and a straight line parallel to the reference contour line and a straight line intersecting the reference contour line at right angles And re-rotating the rectangle created by the process of creating a rectangle composed of straight lines parallel to each other and the process of creating the rectangle in the opposite direction about the end of the reference contour line by the predetermined angle. Yo And the process of rotating the building outline data by a predetermined angle and the process of rotating the rectangle in the reverse direction by the predetermined angle using the rotation matrix, Provided is a reference airflow field data creation program for causing a computer to execute rotation .

  According to the present invention, it is possible to shorten the time required for creating the airflow database.

  Hereinafter, an embodiment of a reference airflow field data creation device according to the present invention will be described with reference to the drawings in the order of [first embodiment] and [second embodiment].

[First Embodiment]
The substance diffusion state prediction system 30 according to the first embodiment of the present invention includes a reference airflow field data creation device 10 and a substance diffusion state prediction device 20 (see, for example, FIG. 2).

  The substance diffusion state prediction device 20 is a device that predicts the diffusion state of a substance at a point of interest when the point of interest is input by a user, for example. The reference airflow field data creation device 10 is a device that creates reference airflow field data used in the substance diffusion state prediction device 20.

  The reference airflow field data creation device 10 and the substance diffusion state prediction device 20 are so-called computer systems. As shown in FIG. 1, main memory devices such as a CPU (Central Processing Unit) 1 and a RAM (Random Access Memory). 2. Auxiliary storage device (storage means) 3 such as ROM (Read Only Memory) and HDD (Hard Disk Drive), input device 4 such as keyboard and mouse, output device 5 such as display and printer, and communication with external devices The communication part 6 etc. which perform are comprised.

FIG. 2 is a functional block diagram of the substance diffusion state prediction system 30 according to the present embodiment.
The reference airflow field data creation device 10 includes an input unit 100 that inputs a region of interest, and a terrain data extraction unit (terrain) that extracts terrain data of the region of interest input from a map database (not shown) in which map data is stored. (Data extraction means) 11 and a building rectangle approximate extraction unit (building) that extracts contour data of a building in the region of interest from the map database, approximates the extracted contour data of the building to a rectangle, and creates data used for airflow calculation (Rectangular approximate extraction means) 12 and an airflow calculation section (airflow calculation means) 13 for obtaining an airflow field using values calculated from the topographic data extraction section 11 and the building rectangular approximate extraction section 12.

The substance diffusion state prediction apparatus 20 stores weather conditions, a point of interest, and an input unit 200 for inputting input information necessary for diffusion prediction of a region of interest including the point of interest, and stores airflow field data of 16 directions. Database 201, airflow field estimation unit 202 for estimating the airflow field, diffusion calculation unit 203 for performing diffusion calculation from the estimated airflow field, concentration field estimation unit 204 for estimating the concentration field, victim estimation for estimating the number of victims The unit 205 includes an information input unit 206 for inputting information on the amount and location of substance leakage.
The region of interest is a region around the point of interest, and defines a range for predicting the diffusion state of the substance emitted from the point of interest.

  In the reference airflow field data creation device 10, the terrain data extraction unit 11 extracts terrain data corresponding to the region of interest input from the input unit 100 from a map database (for example, the Geographical Survey Institute terrain database) not shown. Elevation mesh data is created from the extracted terrain data, and is output to the airflow calculation unit 13 (details will be described later).

  The building rectangle approximation extraction unit 12 includes a building rectangle approximation unit 121 and an input building data creation unit 122. The building rectangle approximation unit 121 extracts the outline data of the building in the region of interest input by the input unit 100 from a map database (not shown), approximates the building outline data to a rectangle, and outputs it to the building data creation unit 122 for input. To do. Below, the building rectangle approximation part 121 is demonstrated more concretely.

FIG. 3 is a functional block diagram showing the functions of the building rectangle approximation unit 121 in an expanded manner. As shown in FIG. 3, the building rectangle approximation unit 121 includes an outline setting unit (contour line setting unit) 123, a coordinate system setting unit (coordinate system setting unit) 124, a building rotation unit (building rotation unit) 125, a rectangle A creation unit (rectangular creation unit) 126 and a building re-rotation unit (building re-rotation unit) 127 are provided.
The building rectangle approximation unit 121 is configured to be connectable to a map database (not shown) in which a map having building outline data that is the outline of the horizontal sectional shape of the building is stored. The building outline data in the area can be acquired.
Specifically, the map database stores map information to which building outline data in a desired area is added, and the building rectangle approximation unit 121 includes building outline data corresponding to the desired area from the map database. The map information can be acquired. Here, building outline data refers to, for example, horizontal cross-sectional shape data of a building.

  In the building rectangle approximation unit 121, the outline setting unit 123 acquires map information with building outline data corresponding to a desired area from the map database, and sets a reference outline for each building outline data in the map. To do. Specifically, in each building outline data, one outline drawn with a straight line from among a plurality of outlines constituting the building outline data is set as a reference outline. More preferably, the outline setting unit 123 sets an outline having the longest distance among the plurality of outlines constituting the building outline data as a reference outline.

The coordinate system setting unit 124 sets an XY orthogonal coordinate system on the map acquired by the contour line setting unit 123. For example, one of the east, west, north, and south is set as the X axis, and the direction orthogonal thereto is set as the Y axis. This XY orthogonal coordinate system may be set individually for each building outline data, or may be set as a common one for all building outline data.
When an individual XY orthogonal coordinate system is set corresponding to each building outline data, the coordinate system setting unit 124 preferably sets the X axis so as to contact one end of the reference outline as shown in FIG. . By setting the XY orthogonal coordinate system in this way, the subsequent rotation processing and rectangle creation processing can be performed more simply.

The building rotation unit 125 rotates the building contour data by a predetermined angle around one end of the reference contour line until the reference contour line set by the contour line setting unit is parallel to the X axis of the XY orthogonal coordinate system. For example, if the building contour data and the XY rectangular coordinates are in a relationship as shown in FIG. 5, the angle θ formed by the reference contour line and the X axis is obtained, and all the building contour data set in the XY rectangular coordinate system are obtained. Is moved by an angle θ about the one end A of the reference contour. Thereby, the relationship between the building outline data and the XY orthogonal coordinates is as shown in FIG.
For the rotation of the coordinates, for example, a rotation matrix can be used. For example, as shown in FIG. 4, when the coordinate (x, y) of the point P is rotated by an angle θ, the coordinate (X, Y) of the point Q after the movement is expressed by a rotation matrix (1) which is a well-known mathematical expression. Can be obtained.

  The rectangle creation unit 126 includes all the vertices of the building outline data after rotation, each side is in contact with at least one vertex of the building outline data, and a straight line parallel to the X axis and the Y axis Create a rectangle composed of parallel straight lines. Specifically, the rectangle creating unit 126 extracts the maximum value and the minimum value of the X coordinate and the maximum value and the minimum value of the Y coordinate from the coordinates of all the vertices converted by the above equation (1), Four vertex coordinates having the extracted maximum value or minimum value are extracted. Furthermore, a rectangle composed of the four extracted points as vertices and a straight line parallel to the X axis and a straight line parallel to the Y axis is created. Thereby, for example, a rectangle as shown in FIG. 7 is created.

  The building re-rotating unit 127 re-rotates the rectangle created by the rectangle creating unit 126 in the reverse direction by a predetermined angle around the one end of the reference contour line. Specifically, the rectangle created by the rectangle creating unit 126 is rotated by an angle θ around the one end A of the reference outline in the direction opposite to the direction rotated by the building rotating unit 125. Thereby, the rectangle shown in FIG. 7 is rotated to the original position as shown in FIG.

  The input building data creation unit 122 converts the building data approximated to a rectangle by the building rectangle approximation unit 121 into a file format that allows calculation of the airflow field, and outputs the data to the airflow calculation unit 13. The file format building data that can calculate the airflow field is, for example, a text format file. In the case of a data file for RAMS, header information is entered in the first and second lines, and the third line. Detailed information is recorded thereafter. More specifically, “999999 (5 single-byte spaces) 1” is input as the fixed value to the header information on the first line, and the number of buildings (the number of data) is input to the header information on the second line. In the detailed information on the third and subsequent lines, the serial number for each line, the latitude and longitude of the center point of the building data, the horizontal width of the building (the horizontal width of the figure approximated to a rectangle), the vertical width of the building (approximated to a rectangle) The angle calculated as the angle from the rightmost edge is input as the height of the figure), the height of the building (from the original attribute value), and the inclination of the building (the angle from the east to the north).

  The airflow calculation unit 13 calculates an airflow field in a wind direction of a predetermined direction based on the values calculated by the topographic data extraction unit 11 and the building rectangle approximate extraction unit 12. The input file for designating the wind direction for calculating the airflow field is automatically created by the airflow boundary condition setting unit 15, and the airflow calculation unit 13 calculates the airflow field of the designated wind direction based on this input file. Do.

  The airflow data storage unit 14 temporarily stores the airflow field data calculated by the airflow calculation unit 13. The airflow boundary condition setting unit 15 automatically stores the information on all the airflow fields in the 16-direction airflow database of the substance diffusion state prediction device when the calculation of the airflow fields is completed for all the specified wind directions. . On the other hand, if the calculation of the airflow field for all wind directions has not been completed, an input file for designating a new wind direction is automatically created by the airflow boundary condition setting unit 15 and the input file is stored in the airflow calculation unit 13. The new airflow field calculation starts.

Next, the substance diffusion state prediction apparatus 20 will be described with reference to FIG.
First, the 16-direction airflow database 201 stores airflow field data calculated by the reference airflow field data creation device 10 described above.
When information such as weather conditions, a point of interest, and a region of interest is input by the input unit 200, the airflow field estimation unit 202 reads from the reference airflow field data stored in the 16-direction airflow database 201 from the input unit 200. Reference airflow field data close to the input weather conditions is extracted, and the airflow field is estimated using the reference airflow field data.

  Specifically, the airflow field estimation unit 202 obtains an average wind direction from the input weather condition, and selects two directions sandwiching the average wind direction among the 16 directions. For example, as shown in FIG. 9, when the average wind direction j is located between the north-northeast and the north-east, the north-northeast and the north-east are selected as two wind directions sandwiching the average wind direction j. Then, two reference airflow field data specified by the two selected wind directions (in the above example, north-northeast and northeast) and the average stability are extracted from the 16-direction airflow database 201. Then, the airflow field estimation unit 202 estimates an airflow field by interpolating the extracted two reference airflow field data.

  The diffusion calculation unit 203 performs diffusion calculation based on the airflow field information estimated by the airflow field estimation unit 202 and the input information 206 of the leakage amount and location. Further, the concentration field estimation unit 204 estimates the concentration field, and the number of victims estimation unit 205 estimates the number of victims. For this processing, a known technique disclosed in Japanese Patent Application Laid-Open No. 2007-304080 (Patent Document 1) and Japanese Patent Application Laid-Open No. 2008-89418 can be used, and detailed description is omitted in this embodiment. To do.

Next, the operation of the substance diffusion state prediction system according to this embodiment will be described.
For example, in the substance diffusion state prediction device 20, when a diffusion substance is released at the point of interest X and initial conditions necessary for diffusion prediction such as the point of interest X and a range of interest are input from the input unit 200 by the operator, This input information is input to the airflow field estimation unit 202 and also input to the topographic data extraction unit 11 and the building rectangle approximate extraction unit 12 via the input unit 100 of the reference airflow field data creation device 10.

  In the terrain data extraction unit 11, terrain data such as elevation data regarding the region of interest is extracted from a terrain database (not shown), elevation mesh data is created based on the terrain data, and the elevation mesh data is output to the airflow calculation unit 13. The

  On the other hand, the building rectangle approximation unit 121 of the building rectangle approximation extraction unit 12 extracts building data of a region of interest from a map database (not shown), and further extracts building outline data from the extracted building data.

  Specifically, in the contour line setting unit 123, when information on a region of interest is input from the input unit 100, building contour data related to the region of interest is extracted from the map database and drawn in a straight line from the building contour data. One contour line is set as the reference contour line. In the coordinate system setting unit 124, an XY orthogonal coordinate system is set for the building outline data extracted by the outline setting unit 123, and coordinates of the XY orthogonal coordinate system are given to all vertices of the building outline data. In the building rotation unit 125, an angle θ formed by the reference contour line and the X axis is obtained as shown in FIG. 5, and each vertex coordinate of the building contour data is rotated by θ degrees around one end of the reference contour line.

  Thereby, the building outline data shown in FIG. 5 is in the state shown in FIG. Subsequently, in the rectangle creation unit 126, the maximum value and the minimum value of the X coordinate value and the maximum value and the minimum value of the Y coordinate value are extracted from the coordinate values of each vertex of the rotated building outline data, and extracted. A rectangle is created by connecting the four XY coordinates obtained by a straight line parallel to the X axis and a straight line parallel to the Y axis. Thereby, as shown in FIG. 7, all the vertices of the building outline data are included, each side is in contact with at least one vertex of the building outline data, and a straight line parallel to the X axis and the Y axis And a rectangle composed of straight lines parallel to each other. And this rectangle is re-rotated in the building re-rotation part 127, and is returned to the original state. The result approximated to the rectangle in this way is output to the input building data creation unit 122 of the rectangle approximation extraction unit 12.

  The input building data creation unit 122 outputs building data in a format that allows calculation of the airflow field. In the airflow calculation unit 13, an airflow field in a predetermined direction is calculated based on the information acquired from the terrain data extraction unit 11 and the building rectangle approximate extraction unit 12, and the calculation result of the airflow field is stored in the airflow data storage unit 14. Is output. The airflow data storage unit 14 temporarily stores airflow field data. When the airflow boundary condition setting unit 15 has completed the calculation of the airflow field in the wind directions of all designated directions, the airflow field data is used as the reference airflow field data as the 16-direction airflow of the substance diffusion state prediction apparatus. Stored in the database.

  Subsequently, from the reference airflow field data stored in the 16-direction airflow database 201, the airflow field estimation unit 202 extracts reference airflow field data related to two directions sandwiching the average wind direction obtained from the weather conditions, Based on this reference airflow field data, an airflow field in the average wind direction is estimated. When the estimated airflow field is output to the diffusion calculation unit 203, the diffusion calculation unit 203 performs diffusion calculation using the input airflow field, leakage amount, location information, and the like, and the concentration field estimation unit 204 performs concentration calculation. In the field estimation and victim number estimation 205, the number of victims is estimated.

As described above, according to the reference airflow field data creation device according to the present embodiment, the terrain data is extracted from the attention area on the map, and the building is approximated to a rectangle from the building information of the attention area. To do. By calculating the airflow field using these extracted topographic data and building rectangle approximate data, it becomes possible to calculate the airflow in consideration of the topography and the shape of the building in the region of interest. . As a result, the diffusion state result predicted by the substance diffusion state prediction device using the airflow field data calculated by the reference airflow field data creation device is the diffusion state of the substance when the airflow is calculated without considering the building. Compared with the prediction, a prediction close to reality is possible.
In addition, even if you do not have specialized knowledge about the calculation of the airflow field, the airflow field is automatically calculated by entering the information of the area of interest, so you can easily find the airflow field Thus, it is possible to calculate the airflow field in a shorter time than manually calculating the airflow field.
Furthermore, when used as a substance diffusion state prediction system, the reference airflow field data creation device and the substance diffusion state prediction device are combined, and the airflow field data calculated from the reference airflow field data creation device is used as the material diffusion state prediction device. Since the time required for creating the airflow field database can be shortened by outputting to, the time required for the entire processing of the substance diffusion state prediction system can be shortened.

  In the present embodiment, the input unit 200 and the input unit 100 are linked, and based on the input conditions input from the input unit 200, reference airflow field data is created in real time. However, instead of this aspect, for example, the reference airflow field data creation device 10 uses reference airflow field data corresponding to various attention points, attention areas, and the like in advance. It is good also as creating and storing these data beforehand in a 16 direction airflow database. As described above, by storing the reference airflow field data in various attention areas in the 16-direction airflow database 201 in advance, the reference stored in the 16-direction airflow database 201 can be used when the actual material diffusion state is predicted. By simply reading out the reference airflow field data in an appropriate direction corresponding to the region of interest from the airflow field data, it is possible to perform diffusion prediction quickly.

  In the present embodiment, the calculation method of the weather model is exemplified by RAMS, but is not limited thereto. For example, MM5, WRF, ARPS, etc. may be used.

  In this embodiment, the map information stored in the map database is described with the case where the building outline data, which is the horizontal section data of the building, is added. In addition to this, the building outline data is further added to the building outline data. The height information of the building may be added. Thus, since the height information is also registered, the building can be represented as a rectangular parallelepiped by sweeping the rectangle created by the above-described method in the height direction. As a result, a three-dimensional simulation can be performed, and a more detailed simulation result can be obtained.

  In the present embodiment, the azimuth for obtaining the airflow field is 16 azimuths, but is not limited to this. For example, it may be four directions of east, west, north, and south, or may be eight directions that further halve east, west, north, and south.

  In the present embodiment, the map having the building outline data is stored in the map database, but the present invention is not limited to this. For example, the building rectangle approximation unit 121 itself may have a map having building outline data.

  In the present embodiment, the building rotation unit 125 rotates the building outline data so as to be parallel to the X axis, but the present invention is not limited to this. For example, it may be rotated until it is parallel to the Y axis, or may be rotated so as to overlap with the X axis or the Y axis.

  When the building re-rotating unit 127 re-rotates the building, it may be rotated by an angle (360 ° −θ) in the same direction as the direction rotated by the building rotating unit 125.

[Second Embodiment]
Next, a rectangular approximation system according to the second embodiment of the present invention will be described.
This embodiment differs from the first embodiment in that the building rectangle approximation unit 121 in FIG. 3 sets the X axis or the Y axis so as to follow the reference contour line of the building contour data.
Specifically, in the present embodiment, when the XY rectangular coordinate system is set on the map, the XY coordinates are set so that one coordinate axis of the XY rectangular coordinate system overlaps or is parallel to the reference contour line. Set the system. Thereby, the process which rotates and re-rotates building outline data like 1st Embodiment mentioned above is abbreviate | omitted.
Thus, according to the rectangular approximation system according to the present embodiment, when setting the XY orthogonal coordinate system, the X axis or the Y axis is set so as to overlap or be parallel to the reference contour line. The X axis or Y axis of the XY orthogonal coordinate system can be used as it is as a rectangular side that approximates the building outline data. This makes it possible to create a rectangle more easily.

It is a figure which shows schematic structure of the reference | standard airflow field data preparation apparatus which concerns on the 1st Embodiment of this invention. It is a functional block diagram of a substance diffusion situation prediction system concerning a 1st embodiment of the present invention. It is the block diagram which expanded and showed the function of the building rectangle approximation part concerning a 1st embodiment of the present invention. It is the figure which showed the coordinate of Q point when the angle (theta) movement of the coordinate of P point of XY orthogonal coordinate system was carried out. It is a figure for demonstrating that the angle which a reference | standard outline and the X-axis form is (theta) degree. It is a figure for demonstrating rotating around A point so that a reference | standard outline may become parallel to an X-axis. It is a figure for demonstrating that building outline data is approximated to a rectangle. It is a figure for demonstrating rotating the produced rectangle by the angle (theta) to the original position. It is a figure for demonstrating the function of the airflow field estimation part of the substance diffusion condition prediction system which concerns on the 1st Embodiment of this invention.

Explanation of symbols

1 CPU
2 Main storage device 3 Auxiliary storage device 4 Input device 5 Output device 6 Communication unit 7 Airflow database 10 Reference airflow field data creation device 11 Terrain data extraction unit 12 Building rectangle approximate extraction unit 13 Airflow calculation unit 14 Airflow data storage unit 15 Airflow boundary Condition setting unit 20 Substance diffusion state prediction device 30 Material diffusion state prediction system 121 Building rectangle approximation unit 122 Input building data creation unit 123 Contour line setting unit 124 Coordinate system setting unit 125 Building rotation unit 126 Rectangle creation unit 127 Building re-rotation unit 200 Input unit 201 16-direction airflow database

Claims (10)

A reference airflow field data creation device for creating reference airflow field data used in a substance diffusion state prediction device for predicting a diffusion state of a substance in an attention region including an attention point,
When the attention area is input, terrain data extracting means for extracting terrain data in the attention area;
A building rectangle approximation extracting means for extracting information on a building in the region of interest, approximating building outline data which is the outline of the building to a rectangle, and outputting the approximation result as building data;
An airflow calculation means for calculating an airflow field in a wind direction of a predetermined direction based on the terrain data extracted by the terrain data extraction means and the building data output by the building rectangle approximate extraction means;
The building rectangle approximate extraction means includes:
Contour line setting means for acquiring building contour data that is a contour of a horizontal cross-sectional shape of a building from information on the building in the region of interest, and using one contour line of the building contour data as a reference contour line;
Coordinate system setting means for setting an XY orthogonal coordinate system on the map having the building outline data;
The building contour data is rotated by a predetermined angle around one end of the reference contour line until one contour line set by the contour line setting means is parallel to the X axis or Y axis of the XY orthogonal coordinate system. Building rotation means;
A straight line that includes all the vertices of the building contour data, each side is in contact with at least one vertex of the building contour data, and is parallel to the reference contour line; and a straight line that intersects the reference contour line at right angles A rectangle creating means for creating a rectangle composed of parallel straight lines;
Building re-rotation means for returning the rectangle created by the rectangle creation means to its original position by re-rotating the rectangle in the reverse direction by the predetermined angle around one end of the reference contour line;
With
The building rotation means and the building re-rotation means rotate the building outline data by using a rotation matrix .   The contour line setting means sets, as the reference contour line, the longest contour line in which another contour line exists only on one side across the contour line from among the contour lines. The reference airflow field data creation device according to 1. The rectangle creating means calculates XY coordinates of all vertices of the building outline data rotated by the building rotating means, and among these XY coordinates, the maximum value and minimum value of the X axis and the maximum value of the Y axis extracting four XY coordinate having the smallest value, extracted four XY coordinate, characterized in that to create a rectangle by connecting with a straight line parallel to the straight line parallel and Y-axis to the X-axis claim 1, wherein Item 3. The reference airflow field data creation device according to Item 2 . The building polygon data, reference airflow field data generating apparatus according to any one of claims 1, characterized in that a height data of該建of claim 3. Building data created by the building rectangular approximation extraction means, reference airflow field data according to any one of claims 1 to 4, characterized in that output by the process as it can data format in the air flow calculating means Creation device. A database used in a harmful substance diffusion device that predicts the diffusion state of a substance when the air flow field in the wind direction of a predetermined direction calculated by the air flow calculation means is calculated for all specified directions. 6. The reference airflow field data creation device according to any one of claims 1 to 5 , wherein the airflow data is output. A substance diffusion state prediction device for predicting a diffusion state of a substance in an attention area including an attention point,
When the weather data is input, a reference similar to the input weather condition is selected from the reference airflow field data generated by the reference airflow field data generation device according to any one of claims 1 to 6. A substance diffusion state prediction device that extracts airflow field data and predicts a diffusion state of a substance in the region of interest using the reference airflow field data. A database for storing reference airflow field data created by the reference airflow field data creation device according to any one of claims 1 to 6 ;
A substance diffusion state prediction system comprising the substance diffusion state prediction apparatus according to claim 7 . A reference airflow field data creation method for creating reference airflow field data used in a substance diffusion state prediction device for predicting a diffusion state of a substance in an attention region including an attention point,
When the region of interest is input, a process of extracting terrain data in the region of interest;
Extracting the information of the building in the region of interest, approximating the building outline data which is the outline of the building to a rectangle, and outputting the approximation result as building data;
A step of calculating an airflow field in a wind direction of a predetermined direction based on the terrain data extracted by the process of extracting the terrain data and the building data output by a process of approximating the building data to a rectangle,
The process of approximating the building data to a rectangle is as follows:
Obtaining building outline data that is the outline of the horizontal cross-sectional shape of the building from the information on the building in the region of interest, and setting one outline of the building outline data as a reference outline;
Setting an XY Cartesian coordinate system on the map having the building outline data;
Predetermining the building contour data around one end of the reference contour until one contour set in the process of setting the reference contour is parallel to the X axis or Y axis of the XY Cartesian coordinate system The process of rotating the angle;
A straight line that includes all the vertices of the building contour data, each side is in contact with at least one vertex of the building contour data, and is parallel to the reference contour line; and a straight line that intersects the reference contour line at right angles Creating a rectangle composed of parallel straight lines;
Re-rotating the rectangle created by the process of creating the rectangle in the reverse direction by the predetermined angle around one end of the reference contour line,
The process of rotating the building outline data by a predetermined angle and the process of rotating the rectangle in the reverse direction by the predetermined angle rotate the building outline data by using a rotation matrix. Method. A reference airflow field data creation program for creating reference airflow field data used in a substance diffusion state prediction apparatus for predicting a diffusion state of a substance in an attention area including an attention point,
When the region of interest is input, processing for extracting terrain data in the region of interest;
Extracting the information of the building in the region of interest, approximating the building outline data which is the outline of the building to a rectangle, and outputting the approximation result as building data;
A process of calculating an airflow field in a wind direction of a predetermined direction based on the terrain data extracted by the process of extracting the terrain data and the building data output by the process of approximating the building data to a rectangle,
The process of approximating the building data to a rectangle is as follows:
Processing to obtain building outline data which is the outline of the horizontal cross-sectional shape of the building from the information of the building in the region of interest, and to set one outline of the building outline data as a reference outline;
A process of setting an XY orthogonal coordinate system on the map having the building outline data;
Predetermining the building contour data around one end of the reference contour until one contour set by the processing for setting the reference contour is parallel to the X axis or Y axis of the XY Cartesian coordinate system Processing to rotate the angle;
A straight line that includes all the vertices of the building contour data, each side is in contact with at least one vertex of the building contour data, and is parallel to the reference contour line; and a straight line that intersects the reference contour line at right angles A process of creating a rectangle composed of parallel straight lines;
Processing to return the rectangle created by the process of creating the rectangle to the original position by re-rotating the rectangle in the reverse direction by the predetermined angle around one end of the reference contour line,
The process of rotating the building contour data by a predetermined angle and the process of mounting and rotating the rectangle in the reverse direction by the predetermined angle use a reference matrix for causing the computer to rotate the building contour data using a rotation matrix. Field data creation program.

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