JP6672346B2 - Water-filled area acquisition device, water-filled area acquisition method, and program - Google Patents

Description

  The present invention relates to a water-filled area obtaining device for obtaining a water-filled area for a paddy field, and the like.

  Farmlands can be damaged by natural disasters such as floods, storms, and earthquakes. In addition, for the purpose of maintaining agricultural production when agricultural land is damaged in this way and stabilizing agricultural management, a disaster recovery project for agricultural land is performed (for example, see Non-Patent Document 1).

"Disaster Recovery Project", [online], Ministry of Agriculture, Forestry and Fisheries, [viewed January 26, 2018], Internet <http://www.maff.go.jp/j/nousin/bousai/bousai_saigai/b_hukkyuu/>

  In such a disaster recovery project, a restoration limit is set, and if the damaged farmland is a paddy field, the calculation of the restoration limit includes the area of the beneficiary land of the paddy field, that is, the area of the paddy field flooded. Is used. Therefore, as a prerequisite for receiving support for restoration, it was necessary to perform surveying and the like to obtain a flooded area in the damaged paddy field, and there was a problem that the burden of such surveying was large.

  The present invention has been made in order to solve the above problems, and provides an apparatus and the like that can realize acquisition of a flooded area of a paddy field required for receiving support for restoration with less burden. With the goal.

In order to achieve the above object, a water-filled area acquisition device according to the present invention includes a storage unit for storing measurement information that is information on three-dimensional point cloud data measured for a paddy field, and a paddy field in which a part of a levee has collapsed. The location of the unbroken ridge that is higher than the cropping area of the paddy field is specified using the measurement information, and the position of the ridge before the collapse of the paddy field is determined based on the specified ridge position. It is provided with an identification unit to be identified, and an acquisition unit to acquire the flooded area of the paddy field using the position of the ridge identified by the identification unit.
With such a configuration, it becomes possible to automatically acquire the flooded area of the affected paddy field by using the measurement information on the three-dimensional point cloud data acquired by a drone or the like. Therefore, for example, it is possible to know a flooded area (a beneficiary land area) without performing surveying or the like on a damaged paddy field, and it is possible to more easily apply for a disaster recovery project. In addition, it becomes possible to easily know the restoration limit using the result of acquiring the flooded area, and by referring to the amount, it is possible to easily determine whether to apply for a disaster recovery project. become able to.

Further, in the water-filled area acquisition device according to the present invention, the measurement information includes information on the paddy field in which the ridge collapsed, and information on the paddy field in which the ridge has not collapsed. Alternatively, a paddy field in which a part of the ridge has collapsed may be specified, and the position of the ridge before the collapse may be specified for the specified paddy field.
With such a configuration, it is possible to automatically discriminate between a paddy field for which a padded area is to be obtained and a paddy field for which padding area is not obtained, thereby improving convenience.

Moreover, the water-filled area acquisition device according to the present invention may further include an output unit that outputs the water-filled area acquired by the acquisition unit.
With such a configuration, the user can know the area covered with water.

Further, in the water-filled area acquisition device according to the present invention, from the water-filled area acquired by the acquisition unit, a calculation unit that calculates the restoration limit of the agricultural land disaster restoration business, and an output unit that outputs the restoration limit calculated by the calculation unit. And may be further provided.
With such a configuration, the user can know the restoration limit.

In the water filled area acquisition device according to the present invention, the storage unit also stores a map corresponding to the position of the paddy field, and the output unit sets the restoration limit on the map in the area of the paddy field corresponding to the restoration limit. May be displayed in association with.
With such a configuration, it is possible to easily grasp which paddy field the restoration limit corresponds to, and user convenience is improved.

  In addition, the method for acquiring a water-filled area according to the present invention is a water-filled area that is processed using a storage unit that stores measurement information that is information on three-dimensional point cloud data measured for a paddy field, a specifying unit, and an acquisition unit. In the area acquisition method, the identification unit identifies, using the measurement information, the position of a non-collapsed ridge that is located higher than the cropped area of the paddy field, with respect to the paddy field in which part of the ridge has collapsed. A step of specifying the position of the ridge before the collapse of the paddy field based on the position of the specified ridge, and the obtaining unit obtains the paddy area of the paddy field using the position of the ridge specified in the specific step. And an acquiring step.

  ADVANTAGE OF THE INVENTION According to the flooded area acquisition apparatus etc. by this invention, the flooded area of the affected paddy field can be acquired automatically, and user's convenience improves.

FIG. 1 is a block diagram illustrating a configuration of a water area acquisition device according to an embodiment of the present invention. 5 is a flowchart showing the operation of the water area acquisition device according to the embodiment. Figure showing an example of a paddy field in which a part of the ridge in the same embodiment collapsed Diagram for explaining position estimation regarding collapsed ridge in the same embodiment The figure for explaining the distance measurement from the predetermined position of the paddy field to the surrounding ridge in the same embodiment The figure which shows an example of the relationship between the distance and the angle from the predetermined position of the paddy field to the surrounding ridge in the same embodiment The figure which shows an example of the output of the flooded area and the restoration limit in the embodiment. FIG. 1 is a schematic diagram illustrating an example of an external appearance of a computer system according to the embodiment. FIG. 2 is a diagram illustrating an example of a configuration of a computer system according to the embodiment.

  Hereinafter, a water-filled area acquisition device according to the present invention will be described using embodiments. Note that, in the following embodiments, components and steps denoted by the same reference numerals are the same or equivalent, and repeated description may be omitted. The water-filled area acquisition device according to the present embodiment automatically obtains a water-filled area for a damaged paddy field by using measurement information on three-dimensional point cloud data.

  FIG. 1 is a block diagram showing a configuration of a water-filled area acquisition device 1 according to the present embodiment. The water area acquisition device 1 according to the present embodiment includes a storage unit 11, a specification unit 12, an acquisition unit 13, a calculation unit 14, and an output unit 15.

  The storage unit 11 stores measurement information, which is information on three-dimensional point cloud data measured for paddy fields. The measurement information may be the three-dimensional point cloud data itself, and may be information on a three-dimensional surface (for example, polygon, TIN (Triangulated Irregular Network) data, It may be a non-uniform rational B-spline (NURBS) surface or the like. In addition, the method of acquiring the three-dimensional point cloud data does not matter. For example, three-dimensional point cloud data may be obtained by a three-dimensional scanner installed on the ground, or three-dimensional point cloud data may be obtained by a three-dimensional scanner mounted on a flying object such as a drone. For example, three-dimensional point cloud data may be obtained by using an aerial photograph taken by an air vehicle such as the above, or three-dimensional point cloud data may be obtained by another method. Note that the three-dimensional point cloud data may be, for example, data whose positional relationship with a map described later is known. Therefore, for example, acquisition of point cloud data may be performed by a three-dimensional scanner for a region where a three-dimensional marker whose shape can be acquired by a three-dimensional scanner may be obtained. May be photographed in the area where is arranged. Then, the positional relationship between the three-dimensional point group data and the map may be understood by using the correspondence between the marker and the position on the map. It is assumed that the measurement information includes at least information on a paddy field in which part of the levee collapsed due to a natural disaster, that is, a paddy field affected by the disaster. The natural disaster may be, for example, a flood, heavy rain, an earthquake, or the like. For example, if a slope such as Doba is formed in a place lower than the paddy field, following a part of the ridge provided around the paddy field, the slope will collapse due to heavy rain etc. The ridge above the slope may also collapse. Some collapses of the levee on paddy fields, for example, occur in this way. The measurement information may also include information on a paddy field in which the ridge has not collapsed, that is, a paddy field that has not been damaged. Normally, when acquiring three-dimensional point cloud data using a flying object such as a drone, information on both affected and unaffected paddy fields can be obtained. A case will be mainly described where the measurement information regarding the three-dimensional point cloud data includes both information. Levees are usually small dikes that define the perimeter of a paddy field.For example, a part of the perimeter of a paddy field faces a mountain slope or retaining wall that is higher than the paddy field. In such a case, portions such as the slopes and retaining walls of the mountain may be considered to be levees in the sense that they are boundaries of paddy fields.

  The storage unit 11 may store a map corresponding to the position of the paddy field. The map may be, for example, a topographic map or a cadastral map, an aerial photograph such as an aerial photograph or a satellite photograph, or another map. Further, it is preferable that coordinate values such as latitude and longitude are set in the map. This is because the positional relationship with the measurement information can be understood. By knowing the positional relationship between the measurement information and the map, it is possible to know the correspondence between the position of the measurement information in the three-dimensional space and the position on the map.

  The process in which the measurement information and the like are stored in the storage unit 11 does not matter. For example, the measurement information and the like may be stored in the storage unit 11 via a recording medium, and the measurement information and the like transmitted via a communication line and the like may be stored in the storage unit 11. Good. The storage in the storage unit 11 may be temporary storage in a RAM or the like, or may be long-term storage. The storage unit 11 can be realized by a predetermined recording medium (for example, a semiconductor memory or a magnetic disk).

  The specifying unit 12 specifies a paddy field in which a part of the ridge has collapsed. The identification of the paddy field may be performed using the measurement information stored in the storage unit 11, for example. Next, the specifying unit 12 specifies the position of the ridge before collapse with respect to the specified paddy field, that is, the paddy field in which a part of the ridge collapsed. Specifically, the specifying unit 12 uses the measurement information to specify the position of the undisintegrated ridge existing at a position higher than the cropped area of the paddy field. A paddy field is an area where crops are planted in a paddy field, and is usually an area surrounded by ridges. Since the ridge surrounding the cropped area is higher than the cropped area, it is possible to specify the position of the ridge that has not collapsed by using the difference in the height. The height is the height in the vertical direction. After that, the specifying unit 12 specifies the position of the ridge before the collapse of the paddy field based on the specified position of the ridge. That is, the specifying unit 12 specifies the position of the ridge before collapse for the collapsed portion by using the position of the ridge that has not collapsed. As a result, for a paddy field in which a part of the ridge has collapsed, the position of the ridge before the collapse, that is, the position of the whole ridge before the collapse of the rice field is specified. The location of the ridge is specified in order to specify the paddy area of the paddy field. Therefore, the position is a position in the horizontal direction. A specific method for specifying a paddy field in which a part of the ridge has collapsed and for specifying the position of the ridge before the collapse will be described later.

  The acquisition unit 13 acquires the flooded area of the paddy field using the position of the ridge specified by the specifying unit 12. As described above, for the paddy field in which a part of the ridge has collapsed, the position of the ridge before the collapse surrounding the paddy field is specified by the specifying unit 12. Therefore, the acquiring unit 13 can specify a range surrounded by the ridge of the paddy field, and can acquire an area of the range, that is, a water-filled area. Here, the watering area is an area of a region where water is filled when growing crops in a paddy field. Therefore, the water-filled area can be considered as an area corresponding to the cropping area surrounded by the ridges, that is, a cultivated area. The cropped area surrounded by the ridge, that is, the area for which the water filled area is to be acquired is a closed area surrounded by the boundary with the ridge. As a method of obtaining the area of the closed region, for example, a method using a coordinate method, a method of dividing the closed region into triangles, calculating the area of each triangle using the Heron's formula, and calculating the sum thereof, etc. It has been known. Therefore, the acquisition unit 13 can calculate the flooded area by such a method, for example. Strictly speaking, the boundary of the closed region may be a curve, but even in such a case, by approximating the boundary to a polygon, the area of the polygon by the above method, that is, The area covered with water can be calculated. This flooded area is the beneficiary area used to calculate the restoration limit of the agricultural land disaster recovery project for the paddy fields.

The calculation unit 14 calculates the restoration limit of the agricultural land disaster restoration business related to the paddy field from the flooded area (benefit area) acquired by the acquisition unit 13. The restoration limit may be calculated using, for example, a function having the water-filled area as an argument. Although not particularly limited, the calculation unit 14 may calculate the restoration limit amount as follows, for example.
Restoration limit (yen) = (water-filled area (ares)) ^0.682 x 1000

  The output unit 15 outputs the area covered with water acquired by the acquisition unit 13 and the restoration limit calculated by the calculation unit 14. In addition, the output unit 15 may display the flooded area and the restoration limit in association with a paddy field corresponding to the flooded area and the restoration limit on the map. The paddy field corresponding to the flooded area is the paddy field for which the flooded area was acquired. Further, the paddy field corresponding to the restoration limit is the paddy field for which the flooded area used for calculating the restoration limit has been acquired. Displaying in association with a paddy field means displaying the paddy field in such a manner that the correspondence between the paddy field and a display target (for example, a flooded area or a restoration limit) can be understood. Specifically, the output unit 15 may display the flooded area and the restoration limit on the area of the paddy field, and may display the flooded area and the restoration limit near the area of the paddy field. It may be displayed so that the correspondence between the area and the area covered with water or the restoration limit can be understood by a leader line or the like. Thus, by displaying the flooded area and the restoration limit in association with the paddy field area on the map, it is possible to easily grasp which paddy field the flooded area and the restoration limit correspond to. Become like Usually, those who apply for the agricultural land disaster recovery project are those who are familiar with the area of the paddy field for which the flooded area is to be acquired and the restoration limit is to be calculated. Therefore, if the relationship between the flooded area and the restoration limit and the area of the paddy field can be known on a map, it will be easy to know what information should be used for one's application, and the convenience of the applicant Can be improved. Note that the output unit 15 may output only the area covered with water or the restoration limit. In that case, the map may not be stored in the storage unit 11.

  Here, this output may be, for example, a display on a display device (for example, a liquid crystal display or an organic EL display), transmission via a communication line to a predetermined device, printing by a printer, or a recording medium. Or may be transferred to another component. Note that the output unit 15 may or may not include a device that performs output (for example, a display device or a printer). The output unit 15 may be realized by hardware, or may be realized by software such as a driver for driving those devices.

  Next, a method of specifying a paddy field in which a part of the ridge has collapsed by the specifying unit 12 will be described. The specifying unit 12 first specifies a cropping area of a paddy field using the measurement information stored in the storage unit 11. The specification may be performed using a map, for example, or may be performed using measurement information. When the map is an aerial photograph, the specifying unit 12 may specify the cropped area of the paddy field by using a color of the aerial photograph or the like. When the map includes a paddy map symbol, the specifying unit 12 specifies the map symbol using a pattern matching method or the like, and designates a location where the map symbol exists as a paddy field cropping area. It may be specified. Further, when specifying the cropped area of the paddy field using the measurement information, even in the measurement information, a location having a continuous area equal to or greater than a threshold value in which the height in the vertical direction is substantially constant may be specified as the cropped area of the paddy field. Good. The threshold value for the area may be set to the area considered to be the minimum of the paddy field surrounded by the ridge.

  Although not particularly limited, the specifying unit 12 may specify, for example, a cropped area of the paddy field using the measurement information as follows. First, a horizontal area corresponding to the measurement information is divided into a plurality of areas such as a grid (grid) or a mesh (mesh). Each area thus divided is called a divided area. Then, a value in the height direction is specified for each divided region. The value may be, for example, a representative value in the height direction. The representative value may be, for example, an average value, a median value, a maximum value, a minimum value, or the like of values in the height direction for each position in the divided region. Next, the specifying unit 12 performs clustering on each of the divided areas by using a value in the height direction corresponding to each of the divided areas by a clustering technique. By this clustering, each divided area corresponding to a paddy field cropping area is classified into one class. Therefore, an area configured by continuous divided areas classified into the same class is considered to be a candidate for a paddy field. Therefore, the specifying unit 12 may set a region having an area equal to or larger than the threshold regarding the area among the regions configured by the continuous divided regions classified into the same class as the paddy field. In addition, since the cropped area of the paddy field is generally considered to be rectangular, the identification unit 12 has an area equal to or larger than the threshold value for the area among the areas configured by the continuous divided areas classified into the same class. The rectangular area may be a paddy field cropping area. It is preferable that the divided area has a sufficiently small area as compared with the cropped area of one paddy field.

  Next, as shown in FIG. 5, the specifying unit 12 sets a set of the distance r to the surrounding ridge and the angle θ using the measurement information, with the vicinity of the center of the specified paddy field as the origin, using the measurement information. get. More specifically, the specifying unit 12 acquires the distance r from the origin set on the cropped area of the paddy field to the inner side surface of the ridge for each angle θ. It is preferable that the origin is set in the cropping area of the paddy field. Therefore, for example, the origin may be set at the center or the center of gravity of the cropping area specified as described above, and a rectangle that can be set in the specified cropping area (this rectangle is, for example, the specified rectangle) (It may be a rectangle having the largest area that can be set in the cropping area.) Or may be set in the specified cropping area by another method. In addition, when acquiring the distance r corresponding to a certain angle θ, the specifying unit 12 determines that the distance from the origin to the vertical plane existing at a position higher than the height of the origin by a predetermined threshold or more and higher than the height of the origin in the angle θ. May be obtained. It is preferable that the predetermined threshold value is set to a value lower than the height of the ridge (for example, 10 cm or 15 cm). The specifying unit 12 may acquire the distance r for each predetermined angle unit, for example. When the measurement information is information on a three-dimensional surface, the distance r can be obtained in such a manner. On the other hand, when the measurement information is the three-dimensional point group data itself, a point corresponding to the value of the angle θ for each predetermined angle unit does not always exist in the point group. Therefore, for example, the specifying unit 12 may acquire the angle θ and the distance r with respect to the point closest to the origin for each predetermined range of the angle θ (for example, every 3 degrees or every 5 degrees). . In the case of a paddy field in which the ridge has not collapsed, the relationship between the distance r and the angle θ is continuous as shown in FIG. On the other hand, when a part of the ridge has collapsed, as shown in FIG. 6B, it becomes discontinuous at the collapsed point (around θ = 270 degrees), or the threshold value Such a large change will occur. Therefore, the identification unit 12 determines whether or not a part of the levee has collapsed in accordance with whether or not there is a discontinuity or a location where a large change equal to or greater than the threshold exists in the relationship between the angle θ and the distance r. May be. That is, when there is a discontinuous portion or a portion where a large change equal to or larger than the threshold exists, the specifying unit 12 may determine that a part of the ridge has collapsed. The result of plotting the set of the distance r and the angle θ is originally discrete, but in FIG. 6, adjacent angles are connected by a solid line. Therefore, near the angle θ = 270 degrees in FIG. 6B, the distance r could not be obtained or the distance r was too large to be displayed within the display range.

  Next, a method of specifying the position of the ridge before collapse regarding the paddy field in which a part of the ridge has collapsed by the identification unit 12 will be described. The identification unit 12 identifies the position of the ridge that has not collapsed in the paddy field in which part of the ridge identified as described above has collapsed. The position of the ridge that has not collapsed may be considered to be the position of the boundary between the planting area and the ridge that has not collapsed. The position of the ridge that has not collapsed can be acquired, for example, using a plurality of pairs of the angle θ and the distance r used in determining whether or not a part of the ridge has collapsed. In such a case, when a plurality of pairs of the angle θ and the distance r are used, a discontinuous point or a point where a large change equal to or larger than the threshold exists corresponds to the position of the collapsed ridge. Do not specify it as an unoccupied ridge. As a result, for example, as shown by the solid line in FIG. 4A, the position of the ridge excluding the collapsed portion is obtained. In this case, the identification of the paddy field where a part of the ridge collapsed and the identification of the position of the ridge before the collapse related to the paddy field where the part of the ridge collapsed were determined by the angle and distance from a predetermined position. Acquisition can be done simultaneously. Strictly speaking, the specified position of the ridge indicates the outline of the ridge on the side of the planting area. In the contour, the specific portion 12 defines a region between the two end points P1 and P2 corresponding to both ends of the position of the collapsed ridge in a portion of the contour including the end point (that is, the area of the ridge that has not collapsed). By performing estimation (extrapolation) using the position), the position of the contour before collapse with respect to the collapsed contour portion (that is, the position of the collapsed ridge) can be specified. By specifying the position of the contour, as shown in FIG. 4A, the entire contour on the cropping area side of the ridge related to the paddy field in which a part of the ridge has collapsed can be acquired. In FIG. 4A, the location indicated by the broken line is the estimated position of the ridge. The above estimation (extrapolation) may be performed, for example, by calculating the direction of the contour of an unbroken portion in a predetermined section from the end point, and extending a straight line from the end point in that direction. For example, as shown in FIG. 4B, when a vertex portion of a rectangular paddy field collapses, it is preferable to perform such extrapolation. On the other hand, as shown in FIG. 4 (a), when a part of a linear side collapses in a rectangular paddy field, when such extrapolation is performed, as shown in FIG. 4 (a). In some cases, it is possible to appropriately estimate the contour of the collapsed portion, or the straight line extended from the end point P1 and the straight line extended from the end point P2 may not intersect. Therefore, in the case where the outline of the non-collapsed portion on one end point (for example, the end point P1) side and the outline of the non-collapsed portion on the other end point (for example, the end point P2) are substantially on a straight line, May estimate the contour of the collapsed portion by connecting both end points.

  In this manner, the specifying unit 12 can specify the position of the ridge before collapse, that is, the position of the ridge before collapse, surrounding the paddy field, for the paddy field in which a part of the ridge has collapsed. More specifically, the identification unit 12 stores information indicating a boundary between a cropped area of a paddy field and a ridge surrounding the cropped area in a recording medium (not shown), so that the information before the collapse surrounding the paddy field is accumulated. May be specified. The information indicating the boundary line may be, for example, information indicating the boundary line by a set of a plurality of points, or may be other types of information indicating the boundary line. The position of the ridge before collapse specified in this way, that is, the boundary line between the ridge surrounding the paddy field and the planting area is a boundary line surrounding the area for which the flooded area is to be obtained. Therefore, as described above, the water filling area can be calculated by the acquisition unit 13 using the boundary line.

Next, the operation of the water area acquisition device 1 will be described with reference to the flowchart of FIG.
(Step S101) Using the measurement information stored in the storage unit 11, the specifying unit 12 specifies a paddy field in which a part of the ridge has collapsed. If no such paddy field is identified, a series of processes may be terminated.

  (Step S102) The identification unit 12 identifies the position of the ridge before collapse in the paddy field in which a part of the ridge has collapsed. When two or more such paddy fields exist, the specifying unit 12 performs this specific process for each of the paddy fields.

  (Step S103) The acquiring unit 13 acquires the flooded area of the paddy field in which a part of the ridge has collapsed, using the position of the ridge before collapse specified by the specifying unit 12. When there are two or more such paddy fields, the acquiring unit 13 performs a process of acquiring a flooded area for each of the paddy fields.

  (Step S104) The calculation unit 14 calculates the restoration limit using the water filled area acquired by the acquisition unit 13. In addition, when the flooding area is calculated for two or more paddy fields, the process of calculating the restoration limit is performed for each of the paddy fields.

  (Step S105) The output unit 15 outputs the water-filled area acquired by the acquisition unit 13 and the restoration limit calculated by the calculation unit 14. When there are two or more sets of the flooded area and the restoration limit, it is preferable that the output unit 15 outputs each of them. The output may be, for example, to display a flooded area or the like in association with a corresponding region on the map, as described above. Then, a series of processing ends.

  Next, the operation of the water filled area acquisition device 1 according to the present embodiment will be described using a specific example. In this specific example, it is assumed that two paddy fields shown in FIG. 3 exist in an area indicated by the measurement information. In the paddy field F11, the surrounding ridge R11 is not collapsed, and in the paddy field F12, a collapse point B11 is present in a part of the ridge R11. In FIG. 3, the ridge R11 on the lower side in the figure of the paddy field F12 follows the slope that becomes lower toward the lower side in the figure, and a part of the slope collapses due to heavy rain or the like. At the collapse point B11, it is assumed that the ridge R11 has also collapsed. Further, in this specific example, the map of the area including the paddy fields F11 and F12 is also stored in the storage unit 11, and the coordinates of the coordinate system of the map and the information related to the three-dimensional point group data included in the measurement information. The system is assumed to be adjusted to be the same. In this specific example, it is assumed that the measurement information is information on a three-dimensional surface.

  When the user inputs an instruction to acquire the water-filled area to the water-filled area acquisition device 1, the instruction is received by a receiving unit (not shown) and passed to the specifying unit 12. Upon receiving the instruction, the specifying unit 12 uses the measurement information stored in the storage unit 11 to specify a paddy field in which a part of the ridge has collapsed (step S101). Specifically, the specifying unit 12 first specifies a cropped area of a paddy field by the above method. In this case, the cropping areas of the paddy field F11 and the paddy field F12 are respectively specified. Next, as shown in FIG. 5, the specifying unit 12 determines, for each of the paddy fields F11 and F12, an angle θ with respect to a predetermined direction (in FIG. 5, the direction of the x-axis) and a distance r from the origin. Are acquired from θ = 1 degree to θ = 360 degrees every one degree. As a result, it is assumed that the paddy field F11 is as shown in FIG. 6A, and the paddy field F12 is as shown in FIG. 6B. Then, in FIG. 6A, the specifying unit 12 determines that the distance r to the surroundings is continuous for each angle, but in FIG. Is located near θ = 270 degrees, the ridge of paddy field F11 has not collapsed, and the ridge of paddy field F12 has been judged to be collapsed. To be specified. Next, the specifying unit 12 specifies the position of the levee before collapse of the specified paddy field F12 as shown in FIG. 4A (Step S102). As a result, the specifying unit 12 has specified the position of the boundary between the planting area and the ridge for the paddy field F12. The specifying unit 12 passes the position of the boundary to the obtaining unit 13. Further, the specifying unit 12 passes the coordinate values in the plane direction near the center of the boundary to the output unit 15.

  When receiving the position of the boundary, the acquisition unit 13 acquires the area inside the boundary, that is, the water-filled area (Step S103). It is assumed that the water-filled area is XXX (a: are). Then, the acquisition unit 13 passes the flooded area to the calculation unit 14 and the output unit 15. Receiving the flooded area “XXX (a)”, the calculation unit 14 calculates the restoration limit by substituting the flooded area into a predetermined function for calculating the restoration limit (step S104). It is assumed that the restoration limit is YYY (yen). The calculation unit 14 passes the restoration limit to the output unit 15.

  Upon receiving the coordinate value, the water-filled area, and the restoration limit, the output unit 15 reads the map from the storage unit 11 and, as shown in FIG. A display indicating the beneficiary value area) “XXX (a)” and the restoration limit “YYY (yen)” is performed (step S105). As a result, the user can easily know that the paddy area of the paddy field F12 is XXX (R) and the restoration limit is YYY (Yen). Then, the user can, for example, apply for an agricultural land disaster recovery project using the information. Further, the user can also decide not to make an application when the output restoration limit is low.

  As described above, according to the flooded area acquisition device 1 according to the present embodiment, by using the measurement information on the three-dimensional point cloud data acquired by a drone or the like, the flooded area and restoration limit amount of the affected paddy can be determined. It can be automatically obtained and output. Therefore, it is possible to know the flooded area and the restoration limit for the damaged paddy fields without conducting surveys using a total station or the like. Can be used. More specifically, it will be possible to easily know the area covered by water and the restoration limit that must be entered in the calculation field book to be created in the application. In addition, referring to the restoration limit, it will be possible to easily determine whether to apply for a farmland disaster restoration project. This is because in the farmland disaster recovery project, disasters with a predetermined amount or less may not be covered. In addition, the identification unit 12 automatically identifies a paddy field in which a part of the ridge has collapsed from a plurality of paddy fields, so that the user does not need to manually specify a paddy field in which a part of the ridge has collapsed. Thus, user convenience is improved. In addition, since the flooded area and the restoration limit are displayed on the map in association with the corresponding paddy fields, the user can easily determine which paddy field the flooded area and the restoration limit correspond to. Will be able to understand.

  Note that the specifying unit 12 may specify a paddy field in which a part of the ridge has collapsed by a method different from the above description, or may specify a position of a non-collapsed ridge in the paddy field. Needless to say. A specific example using a method different from the above description will be described below. For example, if the horizontal section of the paddy field can be acquired using the measurement information, the specifying unit 12 specifies the cropping area as described above, and a predetermined height (for example, A cross section at a position higher by 10 cm or 15 cm is acquired. Since the cross section is higher than the cropped area, the cropped area is not included and indicates the position of the levee. Therefore, it is preferable that the predetermined height is set to a value that includes the position of the ridge. In the section corresponding to the ridge, when the cropped area of the paddy field is a closed area, the ridge of the paddy field has not collapsed. On the other hand, in the cross section corresponding to the ridge, if the cropped area of the paddy field is an open area, the ridge of the paddy field is partially collapsed. Further, when a part of the ridge of the paddy field is collapsed in such a manner, the contour of the cross section on the side of the cropping region indicates a boundary between the cropping region and the ridge. Therefore, by specifying the contour of the cross section on the side of the planting area, the position of the unbroken ridge in the paddy field can be specified.

  Further, in the present embodiment, the case where the flooded area and the restoration limit are displayed on the map has been mainly described, but this is not essential. When the area covered with water is not displayed on the map, the map may not be stored in the storage unit 11. In that case, for example, a flooded area or the like may be output in association with information that can specify a paddy field. The information that can specify the paddy field may be, for example, coordinate values (for example, values of latitude and longitude) near the center of the paddy field.

  Further, in the present embodiment, a case where both the water-filled area and the restoration limit are output has been described, but this is not essential. If no watering area is required, only the restoration limit may be output.

  Further, in the present embodiment, the case where the restoration limit is calculated from the water-filled area has been described, but this is not essential. When the restoration limit is not calculated, the flooded area acquisition device 1 may not include the calculation unit 14. In that case, the output unit 15 may output the water-filled area acquired by the acquisition unit 13. The output may be performed on the map in association with the paddy field corresponding to the flooded area to be output, as described above, or may not be performed.

  Further, in the present embodiment, a case has been described in which the identification unit 12 identifies a paddy field in which a part of the ridge has collapsed, but this is not essential. In a case where the identification of the paddy field in which a part of the ridge has collapsed is not performed by the specifying unit 12, the water-filled area acquisition device 1, for example, includes information indicating the position of the paddy field in which a part of the ridge has collapsed (eg, (It may be information indicating a part of the cropped area of the paddy field on a map or the like) from the user. Then, the specifying unit 12 may perform a process of specifying the position of the ridge before collapse for the paddy field specified by the received information.

  Further, in the above embodiment, the case where the flooded area acquisition device 1 is a stand-alone device has been described. However, the flooded area acquisition device 1 may be a standalone device, or may be a server device in a server-client system. Good. In the latter case, the output unit or the reception unit may receive an input or output information via a communication line.

  Further, in the above embodiment, each process or each function may be realized by being centrally processed by a single device or a single system, or may be realized by distributed processing by a plurality of devices or a plurality of systems. It may be realized by doing.

  Further, in the above-described embodiment, the information exchange performed between the components is performed by, for example, one of the components when the two components performing the information exchange are physically different from each other. It may be performed by outputting information and receiving information by the other component, or, when two components performing the transfer of the information are physically the same, one component may be used. May be performed by shifting from the processing phase corresponding to the above to the processing phase corresponding to the other component.

  Further, in the above embodiment, information related to the processing executed by each component, for example, information received, obtained, selected, generated, transmitted, or received by each component Also, information such as thresholds, mathematical expressions, addresses, and the like used by each component in the processing may be temporarily or long-term stored in a recording medium (not shown), even if not explicitly described in the above description. The storage of information on the recording medium (not shown) may be performed by each component or a storage unit (not shown). The reading of information from the recording medium (not shown) may be performed by each component or a reading unit (not shown).

  Further, in the above embodiment, when information used by each component and the like, for example, information such as a threshold and an address used by each component in processing and various setting values may be changed by a user, The user may or may not be able to change such information as appropriate, even if not explicitly stated in the description. When the information can be changed by the user, the change is realized by, for example, a receiving unit (not shown) that receives a change instruction from the user and a changing unit (not shown) that changes the information according to the change instruction. You may. The reception of the change instruction by the receiving unit (not shown) may be, for example, reception from an input device, reception of information transmitted via a communication line, or reception of information read from a predetermined recording medium. .

  Further, in the above embodiment, when two or more components included in the flooded area acquisition device 1 have a communication device, an input device, and the like, the two or more components have a physically single device. Or may have separate devices.

  Further, in the above embodiment, each component may be configured by dedicated hardware, or a component that can be realized by software may be realized by executing a program. For example, each component can be realized by a program execution unit such as a CPU reading and executing a software program recorded on a recording medium such as a hard disk or a semiconductor memory. At the time of execution, the program execution unit may execute the program while accessing the storage unit and the recording medium. In addition, the software which implement | achieves the water-filled area acquisition apparatus 1 in the said embodiment is the following programs. In other words, this program uses a computer that can access a storage unit that stores measurement information, which is information on three-dimensional point cloud data measured for paddy fields, for paddy fields where a part of the levee has collapsed. Identifying unit that uses the measurement information to identify the position of the ridge that has not collapsed and that is located higher than the area, and identifies the position of the ridge before the collapse of the paddy field based on the identified ridge position. This is a program for functioning as an acquisition unit that acquires the paddy area of a paddy field using the position of the ridge specified by the specification unit.

  Note that, in the above-described program, functions realized by the program do not include functions that can be realized only by hardware. For example, at least a function realized by hardware such as a modem or an interface card in an obtaining unit for obtaining information, an output unit for outputting information, or the like is not included at least in the functions realized by the program.

  Further, the program may be executed by being downloaded from a server or the like, and the program recorded on a predetermined recording medium (for example, an optical disk such as a CD-ROM, a magnetic disk, a semiconductor memory, or the like) may be read. May be performed by Further, this program may be used as a program constituting a program product.

  The computer that executes this program may be a single computer or a plurality of computers. That is, centralized processing or distributed processing may be performed.

  FIG. 8 is a schematic diagram illustrating an example of the external appearance of a computer that executes the program and realizes the water-filled area acquisition device 1 according to the embodiment. The above embodiment can be realized by computer hardware and a computer program executed on the computer hardware.

  8, a computer system 900 includes a computer 901 including a CD-ROM drive 905, a keyboard 902, a mouse 903, and a monitor 904.

  FIG. 9 is a diagram showing the internal configuration of the computer system 900. 9, a computer 901 is connected to an MPU (Micro Processing Unit) 911, a ROM 912 for storing a program such as a boot-up program, and a MPU 911 in addition to a CD-ROM drive 905, and is used to transfer instructions of an application program. A RAM 913 for temporarily storing and providing a temporary storage space, a hard disk 914 for storing application programs, system programs, and data, and a bus 915 for mutually connecting the MPU 911, the ROM 912, and the like are provided. Note that the computer 901 may include a network card (not shown) that provides a connection to a LAN, a WAN, or the like.

  A program that causes the computer system 900 to execute the function of the water-filled area acquiring device 1 according to the above embodiment may be stored in the CD-ROM 921, inserted into the CD-ROM drive 905, and transferred to the hard disk 914. Alternatively, the program may be transmitted to the computer 901 via a network (not shown) and stored in the hard disk 914. The program is loaded into the RAM 913 at the time of execution. Note that the program may be loaded directly from the CD-ROM 921 or a network. Further, the program may be read into the computer system 900 via another recording medium (for example, a DVD or the like) instead of the CD-ROM 921.

  The program may not necessarily include an operating system (OS) or a third-party program that causes the computer 901 to execute the function of the water-filled area acquisition device 1 according to the above-described embodiment. The program may include only a part of an instruction that calls an appropriate function or module in a controlled manner to obtain a desired result. It is well known how the computer system 900 operates, and a detailed description thereof will be omitted.

  In addition, the present invention is not limited to the above-described embodiments, and various changes can be made, and it goes without saying that these are also included in the scope of the present invention.

  As described above, according to the water-filled area acquisition device and the like of the present invention, the effect of obtaining the water-filled area of a paddy field in which a part of the levee has collapsed can be obtained. For example, a device or system that supports an application for a farmland disaster recovery project It is useful as such.

Reference Signs List 1 area acquisition device 11 storage unit 12 identification unit 13 acquisition unit 14 calculation unit 15 output unit

Claims (7)

A storage unit for storing measurement information, which is information on three-dimensional point cloud data measured for paddy fields,
For a paddy field in which a part of the ridge collapsed, the position of the undisturbed ridge existing at a position higher than the cropping area of the paddy is specified using the measurement information, and the position of the specified ridge is specified. A specifying unit that specifies the position of the ridge before the collapse of the paddy field based on the
An acquisition unit configured to acquire a padded area of the paddy field using a position of the levee specified by the specifying unit. The measurement information includes information on paddy fields where the ridge has collapsed, and information on paddy fields where the ridge has not collapsed,
The water filling according to claim 1, wherein the specifying unit specifies the paddy field in which a part of the ridge has collapsed using the measurement information, and specifies the position of the ridge before the collapse with respect to the specified paddy field. Area acquisition device. The water-filled area acquisition device according to claim 1 or 2, further comprising an output unit that outputs the water-filled area acquired by the acquisition unit. From the flooded area acquired by the acquisition unit, a calculation unit that calculates the restoration limit of the agricultural land disaster restoration business,
3. The water-filled area acquisition device according to claim 1, further comprising: an output unit configured to output a restoration limit calculated by the calculation unit. 4. In the storage unit, a map corresponding to the position of the paddy field is also stored,
5. The water-filled area acquisition device according to claim 4, wherein the output unit displays the restoration limit amount in association with a paddy field corresponding to the restoration limit amount on the map. A storage unit in which measurement information, which is information on three-dimensional point cloud data measured for a paddy field, is stored, a specifying unit, and a method of acquiring a water-filled area that is processed using the acquisition unit.
For the rice field in which a part of the ridge collapsed, the specifying unit specifies, using the measurement information, the position of the ridge that has not collapsed, which is located at a position higher than the cropping area of the paddy field, and specifies the position. A specifying step of specifying the position of the ridge before the collapse of the paddy field based on the position of the ridge;
An acquisition step of acquiring the paddy area of the paddy field using the position of the ridge specified in the specifying step. A computer that can access a storage unit in which measurement information, which is information on three-dimensional point cloud data measured on rice fields, is stored,
For the paddy field where a part of the ridge collapsed, the position of the undisturbed ridge existing at a position higher than the cropping area of the paddy is specified using the measurement information, and the position of the specified ridge is specified. A specifying unit that specifies the position of the ridge before the collapse of the paddy field based on the
A program for functioning as an acquisition unit that acquires a flooded area of the paddy field using a position of the ridge specified by the specifying unit.

Images