JP7407325B1 - Water depth information processing device, flood analysis support device, and water depth information processing method - Google Patents

Abstract

[Problem] To suppress the influence when an error is mixed into the position information of a survey point. [Solution] A boundary condition expansion processing unit 36 that sets measurement position water depth information indicating water depth at a plurality of measurement positions as peripheral position water depth information indicating water depth at surrounding positions of the measurement position, measurement position water depth information, and measurement position water depth information. Measured position elevation information corresponding to the altitude of , Measured position water level information that is the water level of the measured position is calculated based on , and each surrounding position water depth information and surrounding position elevation information corresponding to the altitude of each surrounding position are calculated. The water depth information processing device 30 is provided with a water level processing unit 38 that calculates peripheral position water level information, which is the water level of each peripheral position, based on . [Selection diagram] Figure 1

Description

The present invention relates to a water depth information processing device, a flood analysis support device, and a water depth information processing method.

As background technology in this technical field, the abstract of Patent Document 1 below states, "First, the elevation of the ground is measured on a fine scale and the elevation distribution is calculated. Next, the depth of flooding is measured on a coarse scale. The flood level is calculated by adding the elevation to the depth.The flood level distribution is calculated by spatially interpolating the flood level.The flood depth distribution is calculated by subtracting the ground elevation from this flood level distribution. ” is stated. Furthermore, in paragraph 0034 of the specification of the same document, it is stated that ``flood point data 193 includes at least information on an ID that can uniquely identify a disaster, the location of a survey point, and the depth of inundation at that point. In this format, the flooded point data 193 is composed of one or more records, and one record is composed of a disaster ID 401, a longitude 402 of the survey point, a latitude 403 of the survey point, and a flood depth 404 of the survey point.'' has been done.

JP2008-309632A

By the way, in the above-mentioned technique, there is no particular mention of countermeasures when the positional information of the survey point contains an error. However, if the location information of the survey point contains an error, the analysis result of the flood state may become inappropriate.
This invention has been made in view of the above-mentioned circumstances, and provides a water depth information processing device, a flooding analysis support device, and a water depth information processing method that can suppress the influence when errors are mixed in the position information of survey points. The purpose is to

In order to solve the above problems, the water depth information processing device of the present invention provides measurement position water depth information indicating the water depth at a plurality of measurement positions, from among a plurality of positions around the measurement position excluding those where buildings are located. is a peripheral position, and a boundary condition development processing unit sets the peripheral position water depth information indicating the water depth at the peripheral position, based on the measurement position water depth information and the measurement position altitude information corresponding to the altitude of the measurement position. Measurement position water level information, which is the water level of the measurement position, is calculated, and the water level information of each of the surrounding positions is calculated based on the water depth information of each of the surrounding positions and the surrounding position elevation information that corresponds to the altitude of each of the surrounding positions. The present invention is characterized by comprising a water level processing unit that calculates peripheral position water level information that is a water level.

According to the present invention, when an error is mixed into the position information of a survey point, the influence can be suppressed.

FIG. 1 is a block diagram of a flood analysis system according to a first embodiment. FIG. 2 is a block diagram of a computer. It is a schematic diagram of a management area. It is a schematic diagram of virtual space. It is a figure showing an example of a data collection. FIG. 2 is a schematic diagram of a virtual space to which measurement positions have been added. FIG. 3 is a diagram showing an example of a related mesh area management table. FIG. 3 is an explanatory diagram of a target mesh region and surrounding mesh regions. It is a figure showing an example of an altitude table. FIG. 7 is a diagram showing another example of a related mesh area management table. It is a figure which shows yet another example of a related mesh area management table. FIG. 3 is a diagram showing an example of a main part of a related mesh area management table. This is an example of a histogram of water depth information and water level information.

[Premise of embodiment]
Various flood analysis systems have been proposed that analyze how the flood state changes after a predetermined period of time when a river overflows within a predetermined area. Water depths measured at a plurality of survey points and position information of these survey points are input to such a flood analysis system. Here, if a measurement device such as water depth is fixedly installed at the survey point, it can be considered that accurate positional information of the survey point is obtained in advance.

On the other hand, when the measuring device is portable, it is necessary to measure the position of the measuring device, that is, the positional information of the survey point by some method and supply it to the flood analysis system. One possible solution is to attach a GPS (Global Positioning System) receiver to the measuring device and use this to measure positional information at the survey point. However, the position information obtained by GPS has an error of about several meters, which can have a significant impact on the analysis results.

For example, assume that a measuring device is used to measure the depth of water outside a certain building. In this case, due to an error mixed into the GPS position information, the water depth may be transmitted to the flood analysis system as if it were the water depth inside the building. As a result, the analysis results of the flood analysis system may become inaccurate. Therefore, the embodiments described below are intended to suppress the influence of errors when they are included in the position information of the survey points by appropriately processing the position information of the survey points and the like.

[First embodiment]
<Configuration of first embodiment>
FIG. 1 is a block diagram of a flood analysis system 1 according to a first embodiment.
In FIG. 1, the flood analysis system 1 includes a plurality of (n units) measurement devices 10-1 to 10-n, a flood analysis support device 20, and a flood analysis device 40. In the following explanation, multiple components or information having the same or similar functions or meanings will be denoted by the same code and an English character "-", for example, "measuring devices 10-1, 10-2". It may be written with numbers attached. However, if there is no need to distinguish between these plurality of components, etc., they may be written with "-" and alphanumeric characters omitted, for example, "measuring device 10."

Each measuring device 10 includes a water depth sensor 12 and a position measuring section 14. The water depth sensor 12 non-contactly measures the water depth at the survey point using ultrasonic waves or infrared rays, and outputs the result as water depth information. The position measuring unit 14 is a GPS receiver, measures the position of the measuring device 10, that is, the longitude and latitude, and outputs the result as position information. That is, the position information includes a "measured longitude" that is the longitude measurement result, and a "measured latitude" that is the latitude measurement result.

By the way, in the following explanation, "water depth" is the distance from the ground to the water surface at the survey point. Moreover, the "water level" is the distance from a predetermined reference altitude to the water surface. In this embodiment, the "average sea level", that is, "0 m above sea level" is used as the "reference elevation", but other reference elevations may be used.

The flooding analysis support device 20 includes an input section 22, an output section 24, a storage section 26, and a processing section 30 (water depth information processing device). The processing unit 30 also includes a virtual space generation processing unit 32, a data acquisition processing unit 34, a boundary condition development processing unit 36 (boundary condition development processing process), a water level processing unit 38 (water level development processing process), It is equipped with

The input unit 22 receives water depth information and position information from each measuring device 10. The processing unit 30 performs processing such as increasing the number of water depth information and position information. Note that the details of the processing will be described later. The output unit 24 supplies the water depth information and position information output by the processing unit 30 to the flooding analysis device 40.

The storage unit 26 stores electronic map data MD, data aggregate MT, and altitude table HT. The electronic map data MD is data such as longitude, latitude, altitude, etc. of each part in the management area 200 (see FIG. 3), which is an area where flooding is expected. Other details such as tables stored in the storage unit 26 will be described later.

FIG. 2 is a block diagram of computer 980. The measuring device 10, flood analysis support device 20, and flood analysis device 40 shown in FIG. 1 all include one or more computers 980 shown in FIG. 2.
In FIG. 2, the computer 980 includes a CPU 981, a storage section 982, a communication I/F (interface) 983, an input/output I/F 984, and a media I/F 985. Here, the storage unit 982 includes a RAM 982a, a ROM 982b, and an HDD 982c. Communication I/F 983 is connected to communication circuit 986. The input/output I/F 984 is connected to the input/output device 987. Media I/F 985 reads and writes data from recording medium 988 .

The ROM 982b stores an IPL (Initial Program Loader) and the like executed by the CPU. The HDD 982c stores application programs, various data, and the like. The CPU 981 implements various functions by executing application programs and the like read into the RAM 982a from the HDD 982c. The inside of the flood analysis support device 20 shown in FIG. 1 above mainly shows functions realized by application programs and the like as blocks. Note that the flooding analysis support device 20 and the flooding analysis device 40 can also be configured by one common computer 980.

FIG. 3 is a schematic diagram of the management area 200.
Here, the management area 200 is an area where flooding is expected and where the flooding situation is managed in real time. A part of the management area 200 includes a part of a river 250, and embankments 260 are installed on both banks of the river 250. The levee 260 is breached at the illustrated levee breach location 262, and as a result of the water of the river 250 flowing out, the flooded area 202 outside the river 250 is flooded.

It is preferable that the management area 200 is set in advance so as to include the flooded area 202 under various situations. Three measurement devices 10-1, 10-2, and 10-3 are installed at three measurement positions Pa, Pb, and Pc in the flooded area 202.

FIG. 4 is a schematic diagram of the virtual space 300.
Virtual space 300 is a two-dimensional space having a shape and size corresponding to management area 200 (see FIG. 3). The virtual space 300 is divided into a plurality of (m) mesh areas 3-1 to 3-m, which are rectangular areas separated by latitude lines 302 and meridian lines 304. A virtual space generation processing section 32 included in the processing section 30 (see FIG. 1) generates a virtual space 300 shown in FIG. 4.

The size of the mesh region 3 may be set arbitrarily, but if the mesh region 3 is made larger, the resolution of processing in the boundary condition expansion processing section 36 will decrease, but the processing speed can be increased. On the other hand, if the mesh area 3 is made smaller, the processing resolution in the boundary condition expansion processing section 36 can be increased, but the processing speed will be reduced. In the example shown in FIG. 4, the mesh area 3 is rectangular, but the mesh area 3 may have a shape other than a rectangle, such as a triangle or a hexagon.

FIG. 5 is a diagram showing an example of the data aggregate MT stored in the storage unit 26 (see FIG. 1).
In FIG. 5, the data set MT includes a plurality of (m) records RMT-1 to RMT-m, and these records are respectively located in mesh areas 3-1 to 3-m (see FIG. 4). handle. The record RMT-k (1≦k≦m) includes longitude information LON(k), latitude information LAT(k), water depth information DEP(k), and water level information WLV(k). There is.

The longitude information LON(k) and latitude information LAT(k) described above are the longitude and latitude of the center point of the mesh area 3-k, and these values can be obtained from the electronic map data MD (see FIG. 1). As a result, longitude information LON(k) and latitude information LAT(k) are written corresponding to all k belonging to the range "1≦k≦m". Further, water depth information DEP(k) and water level information WLV(k) are initialized to "0".

FIG. 6 is a schematic diagram of a virtual space 300 to which measurement positions have been added.
The measurement positions Pa, Pb, and Pc of the measuring devices 10-1, 10-2, and 10-3 shown in FIG. 1 are included in any mesh area 3 in the virtual space 300. Therefore, the virtual space generation processing unit 32 calculates the measurement positions P-a, P-b, P in these virtual spaces 300 based on the position information acquired from each measuring device 10-1, 10-2, 10-3. - Identify c. The mesh areas including these measurement positions P-a, P-b, and P-c are called mesh areas 3-a, 3-b, and 3-c, as shown in FIG.

In the example shown in FIG. 3, the measurement positions Pa, Pb, and Pc are all located near the approximate center of the management area 200. However, in order to illustrate the process when the measurement position is located at a corner of the management area 200, it is assumed in FIG. 6 that the measurement position Pa is located at the upper left corner of the virtual space 300.

FIG. 7 is a diagram showing an example of the related mesh area management table PT.
The related mesh area management table PT is an alias of the data set MT, which is obtained by extracting some records of the data set MT. In other words, an alias for some of the records in the "data aggregate MT" is the "related mesh area management table PT."

In the state of FIG. 7, the related mesh area management table PT has records RPT-a, RPT-b, and RPT-c corresponding to measurement positions Pa, Pb, and Pc. Then, the record RPT-x (where x is a, b, or c) contains the longitude information LON(x), the latitude information LAT(x), and It includes water depth information DEP(x) and water level information WLV(x).

The data acquisition processing unit 34 identifies records corresponding to the mesh areas 3-a, 3-b, and 3-c from among the records of the data aggregate MT, and configures the related mesh area management table PT based on these records. do. The data acquisition processing unit 34 then sets the water depth information acquired from the measurement devices 10-1, 10-2, and 10-3 as water depth information DEP(x) (where x is a, b, or c). , is written to the related mesh area management table PT. Note that, since the related mesh area management table PT is an alias, operations such as updating data on the related mesh area management table PT are reflected in the data aggregate MT. Further, in the state shown in FIG. 7, the water level information WLV(x), that is, the water level information WLV(a), WLV(b), and WLV(c) are initialized to "0".

FIG. 8 is an explanatory diagram of the target mesh region and surrounding mesh regions.
In FIG. 8, partial virtual spaces 300A and 300B are both part of virtual space 300.
The partial virtual space 300A is a corner of the virtual space 300, and the partial virtual space 300B is the center of the virtual space 300. In this embodiment, mesh areas (3-a, 3-b, 3-c) including measurement positions (for example, Pa, P-b, and P-c in FIG. 6) by the measuring device 10 are defined as " Mesh regions adjacent to the target mesh region (including those adjacent diagonally) are referred to as "surrounding mesh regions."

In the example of the partial virtual space 300A, the mesh area 3-a marked with a double circle at its corner is the target mesh area, and the three mesh areas 3-a1, 3- marked with circles around it are the mesh area 3-a marked with a double circle. a2,3-a3 becomes the peripheral mesh area. Further, in the example of the partial virtual space 300B, the mesh area 3-b marked with a double circle in the center thereof is the target mesh area, and the eight mesh areas 3-b1 ~ marked with circles around it are the target mesh area. 3-b8 becomes the peripheral mesh area.

However, if a building is located in a mesh area located around the target mesh area, the mesh area is excluded from the surrounding mesh area. Therefore, the number of surrounding mesh regions corresponding to a certain target mesh region may be two, for example. The boundary condition expansion processing unit 36 (see FIG. 1) identifies surrounding mesh regions for each target mesh region in the manner described above.

FIG. 9 is a diagram showing an example of the altitude table HT.
The altitude table HT is stored in the storage unit 26 (see FIG. 1), and includes a plurality of records HTR-a, HTR-a1, ..., which are stored in each target mesh area (see FIG. 8). 3-a, 3-b, etc.) and surrounding mesh areas (3-a1, 3-a2, 3-a3, etc.). When the record number of these records is k, each record includes longitude information LON(k), latitude information LAT(k), and elevation information ELE(k).

The boundary condition expansion processing unit 36 reads elevation information ELE(k) in the target mesh region and surrounding mesh regions from the electronic map data MD (see FIG. 1), and creates an elevation table HT.

FIG. 10 is a diagram showing another example of the related mesh area management table PT.
Previously, the related mesh area management table PT shown in FIG. 7 included records corresponding to the target mesh area, but the one in FIG. 10 has records corresponding to surrounding mesh areas added to this. . For example, in FIG. 10, the related mesh area management table PT includes a record RPT-a corresponding to the mesh area 3-a (see FIG. 8) which is the target mesh area, and mesh areas 3-a1 and 3 which are the surrounding mesh areas. Records RPT-a1, RPT-a2, and RPT-a3 corresponding to -a2, 3-a3 are shown.

The water level processing unit 38 (see FIG. 1) adds the water depth information (for example, DEP (a)) in the target mesh area and each elevation information (for example, ELE (a), see FIG. 9), and the result is is written into the related mesh area management table PT as water level information (WLV(a)) in the target mesh area. As a result, the related mesh area management table PT becomes as shown in FIG. 10, for example.

In the example of FIG. 10, water depth information DEP(a) corresponding to the mesh area 3-a, which is the target mesh area, is supplied from the measuring device 10 (see FIG. 1) provided in this mesh area 3-a. The water depth information will be written. In the illustrated example, water depth information DEP(a) is assumed to be "0.1 m". Further, in the example of FIG. 10, the water level information WLV(a) corresponding to the mesh area 3-a is "5.7+0.1=5.8 m". However, at the stage shown in FIG. 10, the water depth information and water level information in the surrounding mesh area are all initialized to "0".

FIG. 11 is a diagram showing still another example of the related mesh area management table PT.
The boundary condition development processing unit 36 applies water depth information (DEP(a1), DEP(a2), DEP(a3)) of each surrounding mesh area (for example, 3-a1, 3-a2, 3-a3) to these areas. Set to the same value as the water depth information (DEP(a)) of the corresponding target mesh area (for example, 3-a). In other words, the water depth information of the target mesh area is commonly applied to the target mesh area and the corresponding surrounding mesh area. Therefore, in the example of FIG. 11, the water depth information DEP(a1), DEP(a2), and DEP(a3) are "0.1 m", which is the same value as the water depth information DEP(a).

In addition, the boundary condition expansion processing unit 36 collects water depth information (DEP(a1), DEP(a2), DEP(a3)) of each surrounding mesh area (for example, 3-a1, 3-a2, 3-a3), The result of adding these elevation information (ELE (a1), ELE (a2), ELE (a3)) is added to the related mesh as water level information (WLV (a1), WLV (a2), WLV (a3)). Write to area management table PT. Therefore, in the example of FIG. 11, the water level information WLV(a1), WLV(a2), and WLV(a3) of the mesh areas 3-a1, 3-a2, and 3-a3, which are the surrounding mesh areas, are respectively "0.1+5 .5=5.6m," "0.1+5.6=5.7m," and "0.1+5.6=5.7m."

As described above, the position information acquired from the measuring device 10 is the measurement result of the position measuring unit 14, which is a GPS receiver, and therefore may contain errors. To cope with this, in this embodiment, the measurement position of the measuring device 10-k (1≦k≦m) is regarded not only as a “point” but also as a “plane”, and the acquired water depth information DEP(k) is Expand into areas.

Then, the data acquisition processing unit 34 acquires water depth information DEP(k) that changes every moment from the measuring device 10, and the water level processing unit 38 acquires water depth information DEP(k) in real time based on the water depth information DEP(k). (k) and the water level information WLV(k) are updated. Then, the boundary condition expansion processing unit 36 calculates water depth information and water level information in the surrounding mesh region in real time based on the water depth information DEP(k) in the target mesh region.

There is an altitude difference between the measurement positions Px where the respective measurement devices 10 are installed. This difference in elevation has a major effect on flooding conditions. Therefore, if only water depth values that do not take into account elevation differences are used for flood analysis, the analysis results in the flood analysis device 40 may become inappropriate.

For this reason, in this embodiment, by obtaining the water level information WLV(x) using the elevation information ELE(x) at the measurement position Px, it is possible to make the analysis results in the flooding analysis device 40 appropriate. can. In the above example, the elevation information ELE(a) and the like are obtained from the elevation table HT, but the elevation information ELE(a) and the like may be obtained directly from the electronic map data MD.

FIG. 12 is a diagram showing an example of the main part of the related mesh area management table PT.
The contents of records RPT-a, RPT-b, and RPT-c shown in FIG. 12 are the same as those shown in FIG. 11. Further, in FIG. 12, elevation information ELE(a), ELE(b), and ELE(c) corresponding to these records are also shown.

Further, FIG. 13 is an example of a histogram of water depth information and water level information.
A graph G13A shown in FIG. 13 illustrates the water depth information DEP(a), DEP(b), and DEP(c) shown in FIG. 12 as a histogram. In graph G13A, the largest water depth information DEP(c) is set as 100%, and the percentage of each water depth information is shown in parentheses.

Further, a graph G13B shown in FIG. 13 is a histogram illustrating the water level information WLV(a), WLV(b), and WLV(c) shown in FIG. 12. In graph G13B, the largest water level information WLV(c) is taken as 100%, and the percentage of each water level information is shown in parentheses.

As is clear from FIG. 13, the difference in percentage between water depth information DEP(a), DEP(b), and DEP(c) is 80% at maximum, but water level information WLV(a), WLV(b), and The maximum percentage difference in (c) is 9%. That is, when compared at different measurement positions, it can be seen that the water level information WLV(a), WLV(b), and WLV(c) have a small rate of change and change smoothly.

[Effects of embodiment]
According to the embodiment described above, the water depth information processing device (30) stores measurement position water depth information (DEP(a)) indicating the water depth at a plurality of measurement positions P-a at the measurement position P-a. a boundary condition expansion processing unit 36 that sets peripheral position water depth information (DEP (a1), DEP (a2), DEP (a3)) indicating the water depth at peripheral positions (3-a1, 3-a2, 3-a3); Measurement position water level information that is the water level of measurement position P-a based on measurement position water depth information (DEP (a)) and measurement position elevation information (ELE (a)) corresponding to the altitude of measurement position P-a. (WLV(a)), and calculate the water depth information of each surrounding position (DEP(a1), DEP(a2), DEP(a3)) and each surrounding position (3-a1, 3-a2, 3-a3). ) of each surrounding position (3-a1, 3-a2, 3-a3) based on the surrounding position elevation information (ELE (a1), ELE (a2), ELE (a3)) corresponding to the altitude of It includes a water level processing unit 38 that calculates peripheral position water level information (WLV (a1), WLV (a2), WLV (a3)) that is the water level.

Thereby, even if an error is mixed into the location information of the survey point, the influence can be suppressed. For example, although measurement position P-a is originally outside the building, as a result of an error mixed in with the position information, the data appears as if measurement position P-a is inside the building. It may be expressed. However, the water level processing unit 38 uses peripheral position water depth information (DEP (a1), DEP (a2), DEP (a3)) for peripheral positions (3-a1, 3-a2, 3-a3) of measurement position P-a. ) is set to the same value as the measurement position depth information (DEP(a)). With these, it is possible to suppress the influence caused by expressing the measurement position Pa as if it were inside the building.

Furthermore, the flood analysis support device 20 is a flood analysis support device 20 that supplies information regarding water depth to the flood analysis device 40 that analyzes changes in the flood state after a predetermined period of time when the river 250 floods in the management area 200. The water depth information processing device (30), a virtual space generation processing unit 32 that generates a virtual space 300 having a plurality of mesh regions 3 based on the electronic map data MD corresponding to the management area 200, and a measurement position water depth A data acquisition processing unit 34 writes information (DEP(a)) to the related mesh area management table PT corresponding to the virtual space 300, and a data acquisition processing unit 34 writes measurement position depth information (DEP(a), DEP(b), An input unit 22 that obtains DEP(c)) and, at this time interval, measurement position water depth information (DEP(a)) and surrounding position water depth information (DEP(a1), DEP(a2), DEP(a3)). and an output unit 24 that outputs measured position water level information (WLV(a)) and surrounding position water level information (WLV(a1), WLV(a2), WLV(a3)) to the flooding analysis device 40. It is even more preferable to have one. As a result, it is possible to supply the measurement position water depth information (DEP(a)) and the surrounding position water depth information (DEP(a1), DEP(a2), DEP(a3)) to the flooding analysis device 40. can.

In addition, the flooding analysis support device 20 further includes a storage unit 26 that stores a related mesh area management table PT and electronic map data MD, and the virtual space generation processing unit 32, when generating the virtual space 300, A virtual space 300 is generated by dividing the area corresponding to the management area 200 in the electronic map data MD into rectangular mesh areas 3, and information corresponding to each mesh area 3 is stored in the storage unit 26 as a data aggregate MT. It is even more preferable to do so. Thereby, information corresponding to each mesh region 3 can be accumulated in the data set MT.

Further, in the process of generating the virtual space 300, the water depth information processing device (30) further adds longitude information (LON(k)) and latitude information to the portion corresponding to each mesh region 3 of the data set MT. (LAT(k)), water depth information (DEP(k)), and water level information (WLV(k)), and the respective longitude information (LON(k)) and latitude information ( LAT(k)), write the longitude and latitude in the electronic map data MD corresponding to each mesh area 3, and write the respective water depth information (DEP(k)) and water level information (WLV(k)) into " It is more preferable to set it to 0. Thereby, the data collection MT can be properly initialized.

In addition, the data acquisition processing unit 34 receives measurement position water depth information (DEP(a)) and measurement position depth information (DEP(a)) from the measurement devices 10 installed at the measurement positions P-a, P-b, and P-c, respectively. A function to obtain the measured longitude (LONM(x)) and measured latitude (LATM(x)), which are the measurement results of longitude and latitude at P-b and P-c, and the respective measured longitudes (LONM(x)). A function that specifies the mesh area 3 corresponding to the measurement latitude (LATM(x)) as the target mesh area and writes measurement position depth information (DEP(a)) to the area corresponding to the target mesh area of the data set MT. It is more preferable to have the following. Thereby, the measurement position water depth information (DEP(a)) can be appropriately reflected in the portion of the data set MT that corresponds to the target mesh area.

In addition, the boundary condition development processing unit 36 has a function of specifying a plurality of mesh regions 3 adjacent to the target mesh region as peripheral mesh regions, and a function of specifying a plurality of mesh regions 3 adjacent to the target mesh region as peripheral mesh regions, and a function of specifying the target mesh region in the region corresponding to the peripheral mesh region of the data set MT. It is more preferable to include a function of writing corresponding measurement position water depth information (DEP(a)). Thereby, the measurement position water depth information (DEP(a)) corresponding to the target mesh area can be reflected in the area corresponding to the surrounding mesh area of the data set MT.

The water level processing unit 38 also stores an elevation table stored in the storage unit 26 using the measured longitude (LONM(x)) and measured latitude (LATM(x)) of the target mesh area in the data set MT as keys. A function to obtain the corresponding measurement position elevation information (ELE(a)) and surrounding position elevation information (ELE(a1), ELE(a2), ELE(a3)) from HT, and measurement position water depth information of the target mesh area. (DEP(a)) and measured position elevation information (ELE(a)), and writes the result as measured position water level information (WLV(a)) corresponding to the target mesh area, and each surrounding area. The surrounding position water depth information (DEP (a1), DEP (a2), DEP (a3)) and the surrounding position elevation information (ELE (a1), ELE (a2), ELE (a3)) of the mesh area are added. The output unit 24 has a function of writing the results as peripheral position water level information (WLV(a1), WLV(a2), WLV(a3)) corresponding to each peripheral mesh area, and the output unit 24 writes the results in the data aggregate MT. Longitude information (LON(x)), latitude information (LAT(x)), water depth information (DEP(x)), and measurement position water level information (WLV(a)) in records related to the target mesh area and surrounding mesh areas. ) and water level information (WLV(x)) which is surrounding position water level information (WLV(a1), WLV(a2), WLV(a3)). As a result, the longitude information (LON(x)), latitude information (LAT(x)), water depth information (DEP(a)), and water level information (WLV(x)) in the records related to the target mesh area and surrounding mesh areas are obtained. )) and can be supplied to the flooding analysis device 40.

[Modified example]
The present invention is not limited to the embodiments described above, and various modifications are possible. The embodiments described above are exemplified to explain the present invention in an easy-to-understand manner, and are not necessarily limited to those having all the configurations described. Further, other configurations may be added to the configuration of the above embodiment, and it is also possible to replace a part of the configuration with another configuration. Furthermore, the control lines and information lines shown in the figures are those considered necessary for explanation, and do not necessarily show all the control lines and information lines necessary on the product. In reality, almost all components may be considered to be interconnected. Possible modifications to the above embodiment include, for example, the following.

(1) Since the hardware of the flood analysis support device 20 in the above embodiment can be realized by a general computer, programs etc. that execute the various processes described above are stored in a storage medium (a computer readable recording medium that records a program). It may be stored or distributed via a transmission channel.

(2) The programs that execute the various processes described above are described as software-based processes using programs in the above embodiment, but some or all of them may be implemented as ASIC (Application Specific Integrated Circuit). Alternatively, it may be replaced with hardware processing using FPGA (Field Programmable Gate Array) or the like.

(3) The various processes executed in the above embodiment may be executed by a server computer via a network (not shown), and the various data stored in the above embodiment may also be stored in the server computer. .

3 Mesh area 3-a1, 3-a2, 3-a3 Mesh area (peripheral position)
10 Measuring device 20 Flood analysis support device 22 Input section 24 Output section 26 Storage section 30 Processing section (water depth information processing device)
32 Virtual space generation processing section 34 Data acquisition processing section 36 Boundary condition expansion processing section (boundary condition expansion processing process)
38 Water level adjustment section (water level adjustment process)
40 Flood analysis device 200 Management area 250 River 300 Virtual space HT Elevation table MD Electronic map data MT Data collection PT Related mesh area management table P-a, P-b, P-c Measurement position

Claims (8)

The measurement position water depth information indicating the water depth at a plurality of measurement positions is defined as a peripheral position excluding the position where a building is located among the plurality of positions around the measurement position, and the peripheral position water depth indicating the water depth at the peripheral position. A boundary condition expansion processing unit that sets as information,
Measurement position water level information, which is the water level at the measurement position, is calculated based on the measurement position water depth information and measurement position elevation information corresponding to the altitude of the measurement position, and each of the surrounding position water depth information and each Water depth information processing comprising: peripheral position elevation information corresponding to the altitude of the peripheral position; and a water level processing unit that calculates peripheral position water level information that is the water level of each of the peripheral positions based on the surrounding position altitude information. Device. A flood analysis support device that supplies information on water depth when a river floods in a managed area,
The water depth information processing device according to claim 1;
an input section;
An output section;
The water depth information processing device includes:
a virtual space generation processing unit that generates a virtual space having a plurality of mesh areas based on electronic map data corresponding to the management area;
further comprising a data acquisition processing unit that writes the measurement position water depth information into a related mesh area management table corresponding to the virtual space,
The input unit acquires the measurement position water depth information at predetermined time intervals ,
The output unit outputs the measured position water depth information, the peripheral position water depth information, the measured position water level information, and the peripheral position water level information at the time interval .
A flood analysis support device characterized by: further comprising a storage unit that stores the related mesh area management table and the electronic map data,
When generating the virtual space, the virtual space generation processing unit generates the virtual space by dividing an area of the electronic map data corresponding to the management area into the rectangular mesh area, and The flood analysis support device according to claim 2, wherein information corresponding to a mesh area is stored in the storage unit as a data aggregate. In the process of generating the virtual space, the water depth information processing device further includes longitude information, latitude information, water depth information, and water level information in portions of the data aggregate corresponding to the respective mesh regions. The longitude and latitude in the electronic map data corresponding to each of the mesh areas are written in each of the longitude information and the latitude information, and each of the water depth information and water level information is written. The flood analysis support device according to claim 3, wherein: is set to "0". The data acquisition processing unit includes:
A function of acquiring the measurement position water depth information and the measurement longitude and measurement latitude that are the measurement results of the longitude and latitude at the measurement position from the measurement devices installed at each of the measurement positions;
a function of specifying the mesh area corresponding to each of the measurement longitude and measurement latitude as a target mesh area, and writing the measurement position water depth information in the area corresponding to the target mesh area of the data aggregate; The flood analysis support device according to claim 4, further comprising: a flood analysis support device. The boundary condition expansion processing unit is
a function of identifying a plurality of mesh regions adjacent to the target mesh region as surrounding mesh regions;
6. The flood analysis support device according to claim 5, further comprising a function of writing the measurement position water depth information corresponding to the target mesh region into a region corresponding to the peripheral mesh region of the data set. . The water level processing section is
Using the measured longitude and measured latitude of the target mesh area in the data aggregate as keys, the corresponding measured position altitude information and surrounding position altitude information are acquired from the altitude table stored in the storage unit. Function and
a function of writing a result of adding the measurement position water depth information and the measurement position elevation information of the target mesh area as the measurement position water level information corresponding to the target mesh area;
a function of writing the result of adding the peripheral position water depth information and the peripheral position elevation information of each of the peripheral mesh regions as the peripheral position water level information corresponding to each of the peripheral mesh regions;
The output unit is configured to output, in the data aggregate, the longitude information, the latitude information, the water depth information, the measurement position water level information, and the surrounding position water level information in records related to the target mesh area and the surrounding mesh area. The flood analysis support device according to claim 6, further comprising a function of outputting water level information. The measurement position water depth information indicating the water depth at a plurality of measurement positions is defined as a peripheral position excluding the position where a building is located among the plurality of positions around the measurement position, and the peripheral position water depth indicating the water depth at the peripheral position. A boundary condition development processing process that is set as information,
Measurement position water level information, which is the water level at the measurement position, is calculated based on the measurement position water depth information and measurement position elevation information corresponding to the altitude of the measurement position, and each of the surrounding position water depth information and each Water depth information processing comprising: peripheral position elevation information corresponding to the altitude of the peripheral position; and a water level processing step of calculating peripheral position water level information, which is the water level of each of the peripheral positions, based on the above. Method.

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