Water depth information processor, flood analysis supporting device, and method for processing water depth information

Abstract

To suppress influence when an error is mixed in positional information of an inspection site.SOLUTION: A water depth information processor 30 includes: a boundary condition development processing unit 36 for setting measurement position water depth information showing water depths in a plurality of measurement positions and surrounding position water depth information showing water depths in positions surrounding the measurement positions; and a water level processing unit 38 for calculating measurement position water level information as a water level of a measurement position on the basis of the measurement position water level information and measurement position height information corresponding to the height of a measurement position and calculating surrounding position water level information on water levels of the surrounding positions on the basis of the surrounding position water level information for each surrounding position and surrounding position height information for the height of each surrounding position.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a water depth information processing device, a flood analysis support device, and a water depth information processing method. [Background technology]

[0002] As background art of this technical field, the abstract of the following Patent Document 1 states, "First, the ground elevation is measured at a fine scale, and the elevation distribution is calculated. Next, the flood depth is measured at a coarse scale. The flood level is calculated by adding the elevation to the flood 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." Also, paragraph 0034 of the specification of the same document states, "The flood point data 193 includes at least an ID that can uniquely identify the disaster, the location of the survey point, and information on the flood depth at that point. For example, in this embodiment, the flood 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." [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2008-309632 A Summary of the Invention [Problem to be solved by the invention]

[0004] However, the above-mentioned technology does not mention measures to be taken when the location information of the survey point contains errors. However, if the location information of the survey point contains errors, the analysis results of the flood condition may be inappropriate. This invention has been made in consideration of the above-mentioned circumstances, and aims to provide a water depth information processing device, a flood analysis support device, and a water depth information processing method that can suppress the effects of errors when they are mixed into the position information of a survey point. [Means for solving the problem]

[0005] In order to solve the above problems, the water depth information processing device of the present invention is characterized in that it comprises a boundary condition expansion processing unit that sets measurement position water depth information, which indicates the water depth at a plurality of measurement positions, as surrounding position water depth information, which indicates the water depth at positions surrounding the measurement position, and a water level processing unit that calculates measurement position water level information, which is the water level at the measurement position, based on the measurement position water depth information and measurement position elevation information corresponding to the elevation of the measurement position, and calculates surrounding position water level information, which is the water level at each of the surrounding positions, based on each of the surrounding position water depth information and surrounding position elevation information corresponding to the elevation of each of the surrounding positions. Effect of the Invention

[0006] According to the present invention, when an error is mixed into the position information of a survey point, the effect of the error can be suppressed. [Brief description of the drawings]

[0007] [Figure 1] FIG. 1 is a block diagram of a flood analysis system according to a first embodiment. [Diagram 2] FIG. 1 is a block diagram of a computer. [Diagram 3] FIG. 2 is a schematic diagram of a management area. [Figure 4] FIG. 2 is a schematic diagram of a virtual space. [Diagram 5] FIG. 2 is a diagram illustrating an example of a data collection. [Figure 6] FIG. 13 is a schematic diagram of a virtual space to which measurement positions have been added. [Figure 7] FIG. 13 is a diagram showing an example of a related mesh region management table; [Figure 8] FIG. 2 is an explanatory diagram of a target mesh region and a surrounding mesh region. [Figure 9]FIG. 13 is a diagram illustrating an example of an altitude table. [Figure 10] FIG. 13 is a diagram showing another example of the related mesh region management table. [Figure 11] FIG. 13 is a diagram showing yet another example of the related mesh region management table. [Figure 12] FIG. 13 is a diagram showing an example of a main part of a related mesh region management table. [Figure 13] 1 is an example of a histogram of water depth information and water level information. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0008] [Prerequisites for the embodiment] Various flood analysis systems have been proposed that analyze how flood conditions change after a certain time when a river floods within a certain area. Water depths measured at multiple survey points and location information of these survey points are input to such flood analysis systems. Here, if measuring devices for water depth and the like are fixedly installed at the survey points, accurate location information of the survey points can be considered to be obtained in advance.

[0009] On the other hand, if the measuring device is portable, the location of the measuring device, i.e., the location information of the survey point, must be measured in some way and provided to the flood analysis system. One possible solution is to attach a GPS (Global Positioning System) receiver to the measuring device and use it to measure the location information of the survey point. However, the location information obtained by GPS has an error of about several meters, which can have a significant effect on the analysis results.

[0010] For example, suppose that water depth is measured using a measuring device outside a building. In this case, due to errors in the GPS location information, the water depth may be transmitted to the flood analysis system as if it were the water depth inside the building. This may result in inaccurate analysis results from the flood analysis system. Therefore, the embodiment described below aims to suppress the effects of errors in the location information of the survey point by appropriately processing the location information of the survey point, etc.

[0011] [First embodiment] Configuration of the First Embodiment FIG. 1 is a block diagram of a flood analysis system 1 according to the first embodiment. 1, the inundation analysis system 1 includes a plurality of (n) measuring devices 10-1 to 10-n, a flood analysis support device 20, and a flood analysis device 40. In the following description, a plurality of components or information having the same or similar functions or significance may be expressed by adding "-" and alphanumeric characters to the same reference numeral, for example, "measuring devices 10-1, 10-2." However, when it is not necessary to distinguish between these multiple components, the components may be expressed by omitting "-" and alphanumeric characters, for example, "measuring device 10."

[0012] Each measurement device 10 is equipped with a depth sensor 12 and a position measurement unit 14. The depth sensor 12 uses ultrasonic or infrared rays to non-contactly measure the water depth at the survey point and outputs the result as water depth information. The position measurement unit 14 is a GPS receiver that measures the position of the measurement device 10, i.e., the longitude and latitude, and outputs the result as position information. In other words, the position information includes a "measured longitude" which is the measurement result of the longitude, and a "measured latitude" which is the measurement result of the latitude.

[0013] In the following description, "water depth" refers to the distance from the ground to the water surface at the survey point. Also, "water level" refers to the distance from a predetermined reference altitude to the water surface. In this embodiment, "mean sea level," i.e., "0 m above sea level," is used as the "reference altitude," but other reference altitudes may be used.

[0014] The flood analysis support device 20 includes an input unit 22, an output unit 24, a storage unit 26, and a processing unit 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 expansion processing unit 36 ​​(boundary condition expansion processing step), and a water level processing unit 38 (water level processing step).

[0015] 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 pieces of water depth information and position information. The details of this 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 flood analysis device 40.

[0016] The storage unit 26 stores electronic map data MD, a data set MT, and an altitude table HT. The electronic map data MD is data on the longitude, latitude, altitude, and the like of each part in a management area 200 (see FIG. 3) that is an area where flooding is expected. Other details of the tables and the like stored in the storage unit 26 will be described later.

[0017] 2 is a block diagram of the computer 980. Each of the measuring device 10, the inundation analysis support device 20, and the inundation analysis device 40 shown in FIG. 2, the computer 980 includes a CPU 981, a storage unit 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 a HDD 982c. The communication I / F 983 is connected to a communication circuit 986. The input / output I / F 984 is connected to an input / output device 987. The media I / F 985 reads and writes data from a recording medium 988.

[0018] The ROM 982b stores an IPL (Initial Program Loader) executed by the CPU, etc. The HDD 982c stores application programs, various data, etc. The CPU 981 executes application programs, etc. loaded from the HDD 982c to the RAM 982a to realize various functions. The interior of the inundation analysis support device 20 shown in FIG. 1 is shown as blocks mainly showing functions realized by application programs, etc. The inundation analysis support device 20 and the inundation analysis device 40 can also be configured by a single common computer 980.

[0019] FIG. 3 is a schematic diagram of the management area 200. As shown in FIG. Here, the management area 200 is an area where flooding is expected and where the flooding situation is managed in real time. Part of the management area 200 includes a part of a river 250, and a levee 260 is installed on both banks of the river 250. The levee 260 has breached at the breach point 262 shown in the figure, causing the water of the river 250 to flow out, resulting in flooding in the flooded area 202 outside the river 250.

[0020] It is preferable that the management area 200 is set in advance so as to include a flooded area 202 under various conditions. 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.

[0021] FIG. 4 is a schematic diagram of a virtual space 300. Virtual space 300 is a two-dimensional space having a shape and size corresponding to the management area 200 (see FIG. 3). Virtual space 300 is divided into a plurality of (m) mesh regions 3-1 to 3-m, which are rectangular regions separated by latitude lines 302 and longitude lines 304. Virtual space generation processing unit 32 included in processing unit 30 (see FIG. 1) generates virtual space 300 shown in FIG.

[0022] The size of the mesh region 3 may be set arbitrarily, but when the mesh region 3 is made large, the resolution of the processing in the boundary condition development processor 36 decreases, but the processing speed can be increased. On the other hand, when the mesh region 3 is made small, the resolution of the processing in the boundary condition development processor 36 increases, but the processing speed decreases. Note that, although the mesh region 3 is rectangular in the example shown in Fig. 4, the shape of the mesh region 3 may be a shape other than a rectangle, such as a triangle or a hexagon.

[0023] FIG. 5 is a diagram showing an example of a data collection MT stored in the storage unit 26 (see FIG. 1). 5, a data set MT has a plurality of (m pieces of) records RMT-1 to RMT-m, which correspond to mesh areas 3-1 to 3-m (see FIG. 4), respectively. 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).

[0024] The above-mentioned longitude information LON(k) and latitude information LAT(k) are the longitude and latitude of the center point of mesh area 3-k, and these values ​​can be obtained from electronic map data MD (see FIG. 1). As a result, the longitude information LON(k) and latitude information LAT(k) are written for all k in the range "1≦k≦m". In addition, the water depth information DEP(k) and water level information WLV(k) are initialized to "0".

[0025] FIG. 6 is a schematic diagram of a virtual space 300 to which measurement positions have been added. 1 are included in any of the mesh regions 3 in the virtual space 300. Therefore, the virtual space generation processing unit 32 identifies the measurement positions Pa, Pb, Pc in the virtual space 300 based on the position information acquired from each of the measuring devices 10-1, 10-2, 10-3. Then, the mesh regions including these measurement positions Pa, Pb, Pc are called mesh regions 3-a, 3-b, 3-c as shown in FIG.

[0026] 3, the measurement positions Pa, Pb, and Pc are all located near the approximate center of the management area 200. However, to illustrate the process when the measurement positions are located at the corners of the management area 200, the measurement position Pa is located at the upper left corner of the virtual space 300 in FIG.

[0027] FIG. 7 is a diagram showing an example of the related mesh region management table PT. The related mesh area management table PT is an alias of the data aggregate MT, which is a part of the records of the data aggregate MT. In other words, the alias of a part of the records of the "data aggregate MT" becomes the "related mesh area management table PT".

[0028] In the state of Fig. 7, the related mesh area management table PT has records RPT-a, RPT-b, and RPT-c corresponding to the measurement positions Pa, Pb, and Pc. And the record RPT-x (where x is a, b, or c) contains longitude information LON(x), latitude information LAT(x), water depth information DEP(x), and water level information WLV(x), similar to the data set MT (see Fig. 5).

[0029] The data acquisition processing unit 34 identifies records corresponding to the mesh areas 3-a, 3-b, and 3-c from among the records in the data set MT, and uses these to construct the related mesh area management table PT. The data acquisition processing unit 34 then writes the water depth information acquired from the measuring devices 10-1, 10-2, and 10-3 as water depth information DEP(x) (where x is a, b, or c) to the related mesh area management table PT. Note that since the related mesh area management table PT is an alias, operations such as data updates to the related mesh area management table PT are reflected in the data set MT. In addition, in the state shown in FIG. 7, the water level information WLV(x), i.e., the water level information WLV(a), WLV(b), and WLV(c), are initialized to "0".

[0030] FIG. 8 is an explanatory diagram of the target mesh region and the surrounding mesh regions. In FIG. 8, partial virtual spaces 300A and 300B are both parts of a 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, a mesh area (3-a, 3-b, 3-c in FIG. 6) including a measurement position (for example, Pa, Pb, Pc in FIG. 6) by the measurement device 10 is called a "target mesh area", and a mesh area adjacent to the target mesh area (including one diagonally adjacent) is called a "surrounding mesh area".

[0031] In the example of the partial virtual space 300A, the mesh area 3-a marked with a double circle at the corner is the target mesh area, and the three mesh areas 3-a1, 3-a2, and 3-a3 marked with circles around it are the surrounding mesh areas. In the example of the partial virtual space 300B, the mesh area 3-b marked with a double circle at the center is the target mesh area, and the eight mesh areas 3-b1 to 3-b8 marked with circles around it are the surrounding mesh areas.

[0032] 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 areas. Therefore, the number of surrounding mesh areas corresponding to a certain target mesh area may be, for example, two. The boundary condition development processing unit 36 ​​(see FIG. 1) specifies the surrounding mesh areas for each target mesh area in the above manner.

[0033] 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 number of records HTR-a, HTR-a1, ..., which correspond to the target mesh areas (3-a, 3-b, etc. in FIG. 8) and the surrounding mesh areas (3-a1, 3-a2, 3-a3, etc. in the same manner). If the record number of these records is k, each record includes longitude information LON(k), latitude information LAT(k), and altitude information ELE(k).

[0034] The boundary condition development processor 36 reads out the elevation information ELE(k) for the target mesh region and the surrounding mesh regions from the electronic map data MD (see FIG. 1) and creates an elevation table HT.

[0035] FIG. 10 is a diagram showing another example of the related mesh region management table PT. Previously, the related mesh area management table PT shown in Figure 7 included records corresponding to the target mesh area, but the one in Figure 10 adds records corresponding to the surrounding mesh areas to this. For example, in Figure 10, the related mesh area management table PT shows record RPT-a corresponding to the target mesh area, mesh area 3-a (see Figure 8), and records RPT-a1, RPT-a2, and RPT-a3 corresponding to the surrounding mesh areas, mesh areas 3-a1, 3-a2, and 3-a3.

[0036] The water level processing unit 38 (see FIG. 1) adds the water depth information (e.g., DEP(a)) in the target mesh area to each elevation information (e.g., ELE(a), see FIG. 9), and writes the result as the water level information (e.g., WLV(a)) in the target mesh area in the related mesh area management table PT. As a result, the related mesh area management table PT becomes, for example, as shown in FIG.

[0037] In the example of Figure 10, water depth information DEP(a) corresponding to mesh area 3-a, which is the target mesh area, is written with water depth information supplied from a measuring device 10 (see Figure 1) installed in this mesh area 3-a. In the example shown, the water depth information DEP(a) is set to "0.1 m." Also, in the example of Figure 10, water level information WLV(a) corresponding to mesh area 3-a is set to "5.7 + 0.1 = 5.8 m." However, at the stage shown in Figure 10, the water depth information and water level information in the surrounding mesh areas have all been initialized to "0."

[0038] FIG. 11 is a diagram showing yet another example of the related mesh region management table PT. The boundary condition development processor 36 sets the water depth information (same DEP(a1), DEP(a2), DEP(a3)) of each surrounding mesh area (e.g., 3-a1, 3-a2, 3-a3) to the same value as the water depth information (same DEP(a)) of the corresponding target mesh area (e.g., 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 areas. Therefore, in the example of FIG. 11, the water depth information DEP(a1), DEP(a2), DEP(a3) is set to the same value as the water depth information DEP(a), which is "0.1 m."

[0039] In addition, the boundary condition development processing unit 36 ​​writes the sum of the water depth information (DEP(a1), DEP(a2), DEP(a3)) of each surrounding mesh area (for example, 3-a1, 3-a2, 3-a3) and their elevation information (ELE(a1), ELE(a2), ELE(a3)) into the related mesh area management table PT as water level information (WLV(a1), WLV(a2), WLV(a3)). Therefore, in the example of FIG. 11, the water level information WLV(a1), WLV(a2), WLV(a3) of the surrounding mesh areas 3-a1, 3-a2, 3-a3 is "0.1+5.5=5.6m", "0.1+5.6=5.7m", and "0.1+5.6=5.7m", respectively.

[0040] As described above, the position information acquired from the measurement device 10 may contain errors because it is the measurement result of the position measurement unit 14, which is a GPS receiver. To address this, in this embodiment, the measurement position of the measurement device 10-k (1≦k≦m) is regarded not only as a "point" but also as a "surface," and the acquired water depth information DEP(k) is expanded into the surrounding mesh area.

[0041] The data acquisition processor 34 acquires the ever-changing water depth information DEP(k) from the measurement device 10, and the water level processor 38 updates the water depth information DEP(k) and water level information WLV(k) in real time based on the water depth information DEP(k). The boundary condition expansion processor 36 calculates the water depth information and water level information in the surrounding mesh regions in real time based on the water depth information DEP(k) in the target mesh region.

[0042] There is an elevation difference between the measurement positions Px where the measurement devices 10 are installed. This elevation difference has a large effect on the flood state. Therefore, if only water depth values ​​that do not take the elevation difference into account are used in flood analysis, the analysis results of the flood analysis device 40 may be inappropriate.

[0043] For this reason, in this embodiment, the water level information WLV(x) is obtained using the elevation information ELE(x) at the measurement position Px, thereby making it possible to obtain appropriate analysis results in the flood analysis device 40. Note that, although the above-mentioned example has been described as an example in which the elevation information ELE(a) and the like are obtained from the elevation table HT, the elevation information ELE(a) and the like may also be obtained directly from the electronic map data MD.

[0044] FIG. 12 is a diagram showing an example of a main part of the related mesh region management table PT. The contents of the records RPT-a, RPT-b, and RPT-c shown in Fig. 12 are the same as those shown in Fig. 11. Furthermore, Fig. 12 also shows the elevation information ELE(a), ELE(b), and ELE(c) corresponding to these records.

[0045] FIG. 13 is an example of a histogram of water depth information and water level information. Graph G13A shown in Figure 13 is a histogram of the water depth information DEP(a), DEP(b), and DEP(c) shown in Figure 12. In graph G13A, the largest water depth information DEP(c) is set to 100%, and the percentage of each water depth information is shown in parentheses.

[0046] Graph G13B in Fig. 13 is a histogram of the water level information WLV(a), WLV(b), and WLV(c) shown in Fig. 12. In graph G13B, the highest water level information WLV(c) is set to 100%, and the percentage of each water level information is shown in parentheses.

[0047] As is clear from Figure 13, the maximum percentage difference between the water depth information DEP(a), DEP(b), and DEP(c) is 80%, but the maximum percentage difference between the water level information WLV(a), WLV(b), and WLV(c) is 9%. In other words, when comparing different measurement positions, it can be seen that the water level information WLV(a), WLV(b), and WLV(c) has a small rate of change and changes smoothly.

[0048] [Effects of the embodiment] As described above, according to the embodiment, the water depth information processing device (30) includes a boundary condition development processing unit 36 ​​that sets measurement position water depth information (DEP(a)), which indicates the water depth at a plurality of measurement positions Pa, as surrounding position water depth information (DEP(a1), DEP(a2), DEP(a3)) which indicates the water depth at surrounding positions (3-a1, 3-a2, 3-a3) of the measurement position Pa, and a boundary condition development processing unit 36 ​​that develops the measurement position Pa based on the measurement position water depth information (DEP(a)) and measurement position elevation information (ELE(a)) which corresponds to the elevation of the measurement position Pa. and a water level conversion processing unit 38 that calculates measurement position water level information (WLV(a)), which is the water level of each of the surrounding positions (3-a1, 3-a2, 3-a3), based on each of the surrounding position water depth information (DEP(a1), DEP(a2), DEP(a3)) and surrounding position elevation information (ELE(a1), ELE(a2), ELE(a3)) corresponding to the elevation of each of the surrounding positions (3-a1, 3-a2, 3-a3).

[0049] This makes it possible to suppress the influence of errors in the position information of the survey point. For example, even if the measurement position Pa is actually outside a building, errors may be mixed into the position information, resulting in the measurement position Pa being represented in the data as if it were inside the building. However, the water level processing unit 38 sets the surrounding position water depth information (DEP(a1), DEP(a2), DEP(a3)) for the surrounding positions (3-a1, 3-a2, 3-a3) of the measurement position Pa to the same value as the measurement position water depth information (DEP(a)). This makes it possible to suppress the influence of the measurement position Pa being represented as if it were inside the building.

[0050] The flood analysis support device 20 supplies information about water depth to a flood analysis device 40 that analyzes changes in the flood state after a predetermined time when a river 250 floods in a management area 200, and includes 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 areas 3 based on electronic map data MD corresponding to the management area 200, and a related mesh area management unit 33 that processes the measured position water depth information (DEP(a)) based on the related mesh area management unit 33 that processes the measured position water depth information (DEP(a)). It is more preferable to provide a data acquisition processing unit 34 which writes the measured position water depth information (DEP(a), DEP(b), DEP(c)) to the flood analysis table PT, an input unit 22 which acquires the measured position water depth information (DEP(a)), the surrounding position water depth information (DEP(a1), DEP(a2), DEP(a3)), the measured position water level information (WLV(a)), and the surrounding position water level information (WLV(a1), WLV(a2), WLV(a3)) at said time intervals to the flood analysis device 40. This makes it possible to supply the measured position water depth information (DEP(a)) and the surrounding position water depth information (DEP(a1), DEP(a2), DEP(a3)) to the flood analysis device 40.

[0051] Moreover, the flood analysis support device 20 further includes a storage unit 26 that stores the related mesh area management table PT and electronic map data MD, and when generating the virtual space 300, the virtual space generation processing unit 32 generates the virtual space 300 by dividing the area of ​​the electronic map data MD that corresponds to the management area 200 with rectangular mesh areas 3, and more preferably stores information corresponding to each mesh area 3 as a data collection MT in the storage unit 26. This allows information corresponding to each mesh area 3 to be accumulated in the data collection MT.

[0052] Furthermore, in the process of generating the virtual space 300, the water depth information processing device (30) further includes longitude information (LON(k)), latitude information (LAT(k)), water depth information (DEP(k)), and water level information (WLV(k)) in the portion of the data set MT corresponding to each mesh area 3, and more preferably writes the longitude and latitude in the electronic map data MD corresponding to each mesh area 3 into each longitude information (LON(k)) and latitude information (LAT(k)), and sets each water depth information (DEP(k)) and water level information (WLV(k)) to "0." This allows the data set MT to be properly initialized.

[0053] Moreover, it is more preferable that the data acquisition processing unit 34 has a function to acquire the measurement position water depth information (DEP(a)) and the measurement longitude (LONM(x)) and measurement latitude (LATM(x)) which are the measurement results of the longitude and latitude at the measurement positions Pa, Pb, Pc from the measurement devices 10 installed at each of the measurement positions Pa, Pb, Pc, and a function to specify the mesh area 3 corresponding to each measurement longitude (LONM(x)) and measurement latitude (LATM(x)) as a target mesh area, and to write the measurement position water depth information (DEP(a)) in the area of ​​the data set MT corresponding to the target mesh area. This allows the measurement position water depth information (DEP(a)) to be appropriately reflected in the part of the data set MT that corresponds to the target mesh area.

[0054] It is more preferable that the boundary condition development processor 36 has a function of identifying multiple mesh areas 3 adjacent to the target mesh area as surrounding mesh areas, and a function of writing the measurement position water depth information (DEP(a)) corresponding to the target mesh area in an area of ​​the data set MT that corresponds to the surrounding mesh areas. This makes it possible to reflect the measurement position water depth information (DEP(a)) corresponding to the target mesh area in an area of ​​the data set MT that corresponds to the surrounding mesh areas.

[0055] The water level processing unit 38 has the following functions: a function of acquiring corresponding measurement position elevation information (ELE(a)) and surrounding position elevation information (ELE(a1), ELE(a2), ELE(a3)) from the elevation table HT stored in the memory unit 26 using the measurement longitude (LONM(x)) and measurement latitude (LATM(x)) of the target mesh area in the data set MT as a key; a function of writing the result of adding the measurement position water depth information (DEP(a)) of the target mesh area to the measurement position elevation information (ELE(a)) as the measurement position water level information (WLV(a)) corresponding to the target mesh area; and a function of calculating the surrounding position water depth information (DEP(a1), DEP(a2), DEP(a3)) of each surrounding mesh area. It is even more preferable that the output unit 24 has a function of writing the result of adding the target mesh area elevation information (ELE(a1), ELE(a2), ELE(a3)) and the surrounding position elevation information (ELE(a1), ELE(a2), ELE(a3)) as surrounding position water level information (WLV(a1), WLV(a2), WLV(a3)) corresponding to each surrounding mesh area, and that the output unit 24 has a function of outputting, in the data collection MT, the longitude information (LON(x)), latitude information (LAT(x)), water depth information (DEP(x)), and water level information (WLV(x)), which is the measurement position water level information (WLV(a)) and the surrounding position water level information (WLV(a1), WLV(a2), WLV(a3)). This enables the longitude information (LON(x)), latitude information (LAT(x)), water depth information (DEP(a)), and water level information (WLV(x)) in records relating to the target mesh area and surrounding mesh areas to be supplied to the flood analysis device 40.

[0056] [Variations] The present invention is not limited to the above-mentioned embodiment, and various modifications are possible. The above-mentioned embodiment is exemplified to explain the present invention in an easy-to-understand manner, and is not necessarily limited to those having all the configurations described. In addition, other configurations may be added to the configuration of the above-mentioned embodiment, and it is also possible to replace a part of the configuration with another configuration. In addition, the control lines and information lines shown in the figure show those that are considered necessary for explanation, and do not necessarily show all the control lines and information lines necessary on the product. In reality, it may be considered that almost all the configurations are connected to each other. Possible modifications of the above-mentioned embodiment are, for example, as follows.

[0057] (1) Since the hardware of the flood analysis support device 20 in the above embodiment can be realized by a general-purpose computer, the programs for executing the various processes described above may be stored on a storage medium (a computer-readable storage medium on which a program is recorded) or distributed via a transmission line.

[0058] (2) In the above embodiment, the programs and the like that execute the various processes described above have been described as software-based processing using programs, but some or all of them may be replaced with hardware-based processing using an ASIC (Application Specific Integrated Circuit) or an FPGA (Field Programmable Gate Array), etc.

[0059] (3) The various processes executed in the above-described embodiments may be executed by a server computer via a network (not shown), and the various data stored in the above-described embodiments may also be stored in the server computer. [Explanation of symbols]

[0060] 3 Mesh Region 3-a1, 3-a2, 3-a3 mesh areas (peripheral positions) 10. Measurement Equipment 20 Flood analysis support equipment 22 Input section 24 Output section 26 Memory section 30 Processing unit (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 processing section (water level adjustment process) 40 Flood analysis device 200 Management Area 250 Rivers 300 Virtual Space HT Elevation Table MD Electronic Map Data MT Data Collection PT related mesh area management table Pa, Pb, Pc measurement positions

Claims

1. a boundary condition expansion processing unit that sets measurement position water depth information indicating water depths at a plurality of measurement positions as surrounding position water depth information indicating water depths at surrounding positions of the measurement positions; a water level calculation processing unit that calculates measurement position water level information, which is the water level at the measurement position, based on the measurement position water depth information and measurement position altitude information corresponding to the altitude of the measurement position, and calculates surrounding position water level information, which is the water level at each of the surrounding positions, based on each of the surrounding position water depth information and surrounding position altitude information corresponding to the altitude of each of the surrounding positions. A water depth information processing device comprising:

2. A flood analysis support device that supplies information about water depth to a flood analysis device that analyzes changes in a flood state after a predetermined time when a river floods in a management area, The water depth information processing device according to claim 1 ; 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; 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; an input unit for acquiring the measurement position water depth information at a predetermined time interval; and an output unit that outputs the measurement position water depth information, the surrounding position water depth information, the measurement position water level information, and the surrounding position water level information to the flood analysis device at the time intervals. A flood analysis support device characterized by the above.

3. A storage unit is further provided for storing 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 by the rectangular mesh areas, and stores information corresponding to each of the mesh areas as a data collection in the storage unit.

3. The flood analysis support device according to claim 2.

4. The water depth information processing device further includes longitude information, latitude information, water depth information, and water level information in the portion of the data set corresponding to each of the mesh areas in the process of generating the virtual space, writes the longitude and latitude in the electronic map data corresponding to each of the mesh areas into each of the longitude information and latitude information, and sets each of the water depth information and water level information to "0".

4. The flood analysis support device according to claim 3.

5. The data acquisition processing unit includes: A function of acquiring, from a measurement device installed at each of the measurement positions, water depth information at the measurement positions and measurement longitude and measurement latitude which are measurement results of the longitude and latitude at the measurement positions; a function of identifying the mesh area corresponding to each of the measurement longitudes and the measurement latitudes as a target mesh area, and writing the measurement position water depth information in an area of ​​the data collection corresponding to the target mesh area.

5. The flood analysis support device according to claim 4.

6. The boundary condition expansion processing unit: a function of identifying a plurality of the mesh regions adjacent to the target mesh region as peripheral mesh regions; a function of writing the measurement position water depth information corresponding to the target mesh area in an area of ​​the data collection that corresponds to the surrounding mesh area.

6. The flood analysis support device according to claim 5.

7. The water level adjustment processing unit includes: a function of acquiring the corresponding measurement position elevation information and surrounding position elevation information from an elevation table stored in the storage unit using the measurement longitude and measurement latitude of the target mesh area in the data collection as a key; a function of writing the 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 surrounding position water depth information and the surrounding position elevation information of each of the surrounding mesh areas as the surrounding position water level information corresponding to each of the surrounding mesh areas, The output unit has a function of outputting, in the data collection, the longitude information, the latitude information, the water depth information, and the water level information, which is the measurement position water level information and the surrounding position water level information, in the records related to the target mesh area and the surrounding mesh area.

7. The flood analysis support device according to claim 6.

8. a boundary condition expansion process for setting measurement position water depth information indicating the water depth at a plurality of measurement positions as surrounding position water depth information indicating the water depth at surrounding positions of the measurement positions; and a water level calculation process for calculating measurement position water level information, which is the water level at the measurement position, based on the measurement position water depth information and measurement position altitude information corresponding to the altitude of the measurement position, and calculating surrounding position water level information, which is the water level at each of the surrounding positions, based on each of the surrounding position water depth information and surrounding position altitude information corresponding to the altitude of each of the surrounding positions. A water depth information processing method comprising:

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