Data creation support method and data creation support device

Abstract

To provide a data creation support method and a data creation support device that support the creation of basic data for restoration work design, enabling restoration plans to be formulated efficiently while ensuring the safety of survey workers.SOLUTION: Images for photogrammetry are taken of an area to be surveyed, including a collapsed slope. From the captured images, three-dimensional topographical data D1 of the area to be surveyed is generated using a data creation support device 1 including a computer. Point cloud mesh data D2 of the area to be surveyed is generated based on the generated three-dimensional topographical data D1. Transverse measurement lines are set at multiple positions in the generated point cloud mesh data D2, and cross-sectional views corresponding to the respective transverse measurement lines are generated. Furthermore, secondary cross-sectional views are generated, in which the amount of data for the cross-sectional views is reduced. Information on road planning height FH for restoration work is set in the generated secondary cross-sectional views, thereby creating data suitable for use in a construction design support program P3 for restoration work. This makes it possible to design restoration work at slope collapse sites.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The present invention relates to a data creation support method and a data creation support device, and more particularly to a technique for supporting the creation of basic data for construction design in restoration work for a collapsed slope along a road.

Background Art

[0002] In Japan, where about 75% of the country's land is occupied by mountains, there are many roads with slopes formed along the roads. Since many of these roads include roads that are important as local residents' living roads, when the slopes along the roads collapse (fall) due to the influence of heavy rain or the like, prompt restoration of the collapsed areas is strongly desired.

[0003] By the way, the restoration work for a collapsed slope is planned according to procedures such as surveying the collapsed area, selecting a restoration method based on the survey results, and designing the construction content according to the selected restoration method. When the collapse of the slope is small-scale (small-scale fall), the survey of the collapsed area is generally carried out by pole survey, which allows easy loading of equipment to the collapse site and enables surveying with a small number of people (see, for example, Patent Document 1).

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] However, such a conventional method has the following problems, and its solution has been desired.

[0006] That is, for the pole survey of the collapsed area, the surveyor has to descend to the collapsed slope to conduct the survey work. However, the collapsed slope often has poor scaffolding and it is difficult for workers to enter. On the other hand, there are also risks of further slope collapse and worker falls, making it difficult to ensure the safety of the workers involved in the survey work.

[0007] Also, in the case of pole survey, it is necessary to tabulate the survey results and transcribe the drawings (drafting work). Depending on the scale of the slope collapse, these operations usually take about several days. Therefore, until these operations are completed, the selection of the restoration method and the construction design cannot be carried out. As a result, if the survey of the collapsed area is carried out by pole survey, there is a problem of poor work efficiency and a delay in starting the restoration work.

[0008] The present invention has been made in view of such problems, and its object is to provide a data creation support method and a data creation support device for creating basic data for restoration work design that can efficiently formulate a restoration plan while ensuring the safety of survey workers.

Means for Solving the Problems

[0009] To achieve the above object, the data creation support method according to the present invention is A data creation support method for supporting the creation of basic data for the design of restoration work for a collapsed slope, A photographing step of photographing an image for photogrammetry for a survey target area including the collapsed slope, A terrain data generation step of generating three-dimensional terrain data of the survey target area based on the image photographed in the photographing step, A mesh data generation step of generating mesh data composed of a point cloud for the survey target area based on the three-dimensional terrain data of the survey target area generated in the terrain data generation step, A cross-section line setting step of setting a cross-section line perpendicular to the collapsed slope at a plurality of positions including the start and end points of the restoration work for the mesh data of the survey target area generated in the mesh data generation step, Based on the cross-sectional survey lines set in the above cross-sectional survey line setting process, a cross-sectional view generation process for generating a cross-sectional view corresponding to each cross-sectional survey line from the mesh data of the survey target area, a cross-sectional view lightweighting process for generating a secondary cross-sectional view with the data volume of the cross-sectional view generated in the above cross-sectional view generation process lightweighted, and a planned height setting process for setting information on the planned height of the restoration work in the secondary cross-sectional view generated in the above cross-sectional view lightweighting process, characterized by comprising:

[0010] And, as a preferred embodiment, the present invention has the following features. (1) In the above imaging process, an imaging device for imaging an image is mounted on an unmanned aerial vehicle, or an imaging device for imaging an image is disposed at the tip of a rod-shaped support member, and the survey target area is imaged from above.

[0011] (2) In the above cross-sectional survey line setting process, the cross-sectional survey lines are set at the start and end points of the above restoration work and at the deepest part of the collapse and / or the change point of the collapse between the start and end points.

[0012] (3) The above cross-sectional view generation process includes a process of setting a construction reference plane on the above cross-section.

[0013] (4) When the collapsed slope is a slope along a road, the above planned height setting process is characterized in that the planned height of the construction at the start and end points of the above restoration work is set based on the intersection of the above secondary cross-sectional view and the center line of the road to be restored.

[0014] (5) The above planned height setting process is characterized in that the planned height of the construction in the secondary cross-sectional view other than the start and end points of the above restoration work is set based on the road longitudinal gradient obtained by connecting the planned heights of the construction at the start and end points of the above restoration work.

[0015] Further, the data creation support device according to the present invention is a data creation support device including a computer for supporting the creation of basic data for the design of restoration work for a collapsed slope, wherein the above computer is Based on the photogrammetric image taken of the survey target area including the collapsed slope, three-dimensional terrain data of the survey target area is generated, Based on the generated three-dimensional terrain data of the survey target area, mesh data consisting of a point cloud for the survey target area is generated, For the generated mesh data of the survey target area, transverse survey lines perpendicular to the collapsed slope are set at a plurality of positions including the start and end points of the restoration work, Based on the set transverse survey lines, cross-sectional views corresponding to each transverse survey line are generated from the mesh data of the survey target area, A secondary cross-sectional view with a reduced data volume of the generated cross-sectional view is generated, It is characterized by having a control configuration for generating basic design data for the restoration work, in which information on the planned height of the restoration work is set in the generated secondary cross-sectional view.

Advantages of the Invention

[0016] According to the present invention, in formulating a restoration plan (selection and design of restoration method) for a collapsed slope, the basic data used for the design of the restoration method is created based on a photographic image of the survey target area including the collapsed slope. Therefore, survey workers can safely create the basic design data for the restoration method without descending to the collapsed slope.

[0017] Also, since the basic data is created by processing the three-dimensional terrain data generated from the image, the basic data can be created using a computer. Therefore, it is possible to efficiently realize the creation of the basic data used for the design of the restoration method from the image in a short time. As a result, it becomes possible to start the restoration work in a short time after the collapse of the slope.

Brief Description of the Drawings

[0018]

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Embodiments for Carrying Out the Invention

[0019] Hereinafter, the data creation support device 1 according to the present invention will be described in detail with reference to the drawings. In the drawings, the same reference numerals denote the same constituent members or elements throughout.

[0020] The data creation support device 1 according to the present invention is, for example, a device that supports the creation of basic data for construction design in the restoration work of a collapsed slope, such as a slope along a road or a slope along a river, and is composed of a computer capable of executing a predetermined program described later, for example, a tablet computer, a notebook computer, a smartphone, or the like, a portable computer.

[0021] In this embodiment, a notebook computer is used as the data creation support device 1, and using this data creation support device 1, data suitable for processing in the construction design support program P3 described later is created from the image captured by the imaging device 2.

[0022] FIG. 1 shows a schematic configuration of the data creation support device 1. As shown in the figure, the data creation support device 1 mainly includes a control unit 11, a storage unit 12, an input unit 13, a display unit 14, and an interface (I / F) unit 15.

[0023] The control unit 11 is a control device that mainly executes programs stored in the storage unit 12, and mainly includes a CPU (Central Processing Unit), a ROM (Read Only Memory), a RAM (Random Access Memory), an I / O port, etc., which are not shown.

[0024] The storage unit 12 is an auxiliary storage device that stores programs, data, etc., and is composed of, for example, an HDD (Hard Disk Drive), an SSD (Solid State Drive), etc. In this embodiment, application programs such as an image processing program P1, a CAD program P2, a construction design support program P3, and a data creation support program P4, and various data used in these application programs are stored in the storage unit 12 (details will be described later).

[0025] The input unit 13 is an input device that inputs information to the control unit 11, and is composed of, for example, a keyboard for inputting characters and numbers, a pointing device such as a touch pad for inputting coordinates on the screen of the display unit 14, and the like. Further, the display unit 14 is a display device that displays characters and graphics, and is composed of, for example, a liquid crystal display such as a TFT liquid crystal, an organic EL display, and the like. Note that by adopting a touch panel display as the display unit 14, all or part of the display unit 14 and the input unit 13 may be used in common.

[0026] The interface unit 15 is an interface that directly or indirectly connects the data creation support device 1 and an external device. Examples thereof include wired interfaces such as USB (Universal Serial Bus) and RS485, and wireless interfaces such as Bluetooth (registered trademark) and NFC (Near Field Communication). Further, the interface unit 15 may be composed of a network interface corresponding to a wired / wireless LAN (Local Area Network). Furthermore, it may be configured in the form of a recording medium reader such as an SD card reader. In the present embodiment, a wired interface such as a USB port is used as the interface unit 15, and image data is input from the imaging device 2 via the interface unit 15.

[0027] The imaging device 2 is a device that generates an image (image data) used for creating basic data for construction design in the data creation support device 1. In the present embodiment, a small and lightweight digital camera such as a smartphone camera or a household compact digital camera is used. The reason for using such a small and lightweight digital camera is that photographic surveying photos are taken of the survey target area including the collapsed slope using this imaging device 2. Therefore, a small and lightweight digital camera suitable for mounting on an unmanned aerial vehicle (drone) or attaching to the tip of a telescopic camera support rod (rod-shaped support member) is preferably used.

[0028] In addition, the imaging device 2 is equipped with a satellite positioning system, and position information (imaging position information) measured by the satellite positioning system is added to the captured images. Specifically, for example, the Global Navigation Satellite System (GNSS), which is a global satellite positioning system, is adopted as the satellite positioning system. Also, for positioning, a relative positioning (RTK (Real Time Kinematic)) method is preferably adopted, in which the imaging device 2 (for example, a smartphone compatible with GNSS) is used as a mobile station, and a base station of a mobile phone or the like is used as a fixed station (reference station). As is well known, the relative positioning method is a method of receiving signals from four or more satellites with two receivers, a mobile station and a fixed station, for positioning. Therefore, compared with single positioning by only the mobile station, position information with high accuracy can be obtained. Therefore, in this embodiment, the data of the image capturing the collapsed slope will include detailed position information of the position where the collapse occurred.

[0029] Next, the data creation procedure using the data creation support device 1 configured as described above will be described with reference to FIGS. 2 to 11. The procedures shown in FIGS. 2 to 11 illustrate the restoration work when a slope along a road in a mountainous area or the like collapses.

[0030] (1) When a slope along a road collapses (particularly, small-scale rockfalls occur) due to heavy rain, an earthquake, etc., workers are sent to the site where the slope collapse occurred, and the workers are made to capture images for photogrammetry of a predetermined survey target area including the slope collapse location (imaging step: see step S1 in FIG. 2).

[0031] Here, the survey target area is an area including the collapsed slope, more specifically, an area that covers a wider range including both the starting point and the ending point (start and end points) of the restoration work for the collapsed location. The photographing of the survey target area is performed by an operator using the photographing device 2. Specifically, the photographing device 2 is mounted on an unmanned aerial vehicle such as a drone and flown over the collapsed location for photographing, or the photographing device 2 is attached to the tip of a telescopic support rod for a camera (rod-shaped support member), and the tip of the support rod is protruded above the collapsed location for photographing, so as to photograph the collapsed location from above. Thereby, the operator can take an image for photogrammetry without descending onto the collapsed slope, ensuring the safety of the operator.

[0032] (2) When the photographing of the image of the survey target area is completed, next, based on the photographed image, three-dimensional terrain data D1 of the survey target area is generated (terrain data generation step: refer to step S2 in FIG. 2).

[0033] The generation of the three-dimensional terrain data D1 is performed by the data creation support device 1. The operator starts the data creation support program P4 of the data creation support device 1 and executes the following procedure according to the instructions of the started data creation support program P4, for example, the instructions displayed on the display unit 14. That is, the operator inputs the photographed image into the data creation support device 1 to generate the three-dimensional terrain data D1. Specifically, the operator inputs the photographed image into the data creation support device 1 and starts the image processing program P1 of the data creation support device 1, and uses the image processing program P1 to generate the three-dimensional terrain data D1 from the image data. The image processing program P1 analyzes the data of the photographic image and generates the three-dimensional terrain data D1 from the photographic image. Note that the three-dimensional terrain data D1 includes three-dimensional (3D) coordinate data of the X-axis, Y-axis, and Z-axis (vertical, horizontal, height).

[0034] FIG. 3 illustrates a plan view based on the three-dimensional terrain data D1 created by the image processing program P1. According to this three-dimensional terrain data D1, as shown in the figure, within the survey target area, there are two collapsed locations (slope collapse locations) along the road.

[0035] (3) When the generation of the three-dimensional terrain data D1 is completed, next, the operator generates mesh data (point cloud mesh data) D2 consisting of a point cloud for the survey target area based on the three-dimensional terrain data D1 of the survey target area (mesh data generation step: refer to step S3 in FIG. 2).

[0036] The creation of the point cloud mesh data D2 is performed by the image processing program P1. FIG. 4 shows the point cloud mesh data D2 generated from the three-dimensional terrain data D1 of the survey target area. In FIG. 4, the dashed line drawn in the vertical direction of the paper indicates the center line of the road (road center line) adjacent to the collapsed slope, and the solid lines drawn on the left and right across this road center line indicate the width of the road.

[0037] (4) When the creation of the point cloud mesh data D2 is completed, next, the operator sets transverse survey lines orthogonal to the collapsed slope (specifically, orthogonal to the road center line) at a plurality of positions including the start and end points (start point B.P and end point E.P) of the restoration work for the point cloud mesh data D2 of the survey target area (transverse survey line setting step: refer to step S4 in FIG. 2).

[0038] Here, the start and end points of the restoration work are determined by the operator who designs the restoration work while referring to the photographic image or the three-dimensional terrain data D1 of the survey target area. For example, in the point cloud mesh data D2 shown in FIG. 4, as described above, since there are two collapsed locations (collapse locations), the start point B.P and the end point E.P of the restoration work are set such that these two collapse locations are included between the start and end points of the restoration work (between B.P - E.P).

[0039] On the other hand, in addition to the start and end points of the above-mentioned restoration work, the cross-sectional survey lines are arbitrarily set, for example, at the deepest part of the collapsed area, the change points of the collapse, etc. In the illustrated example, the cross-sectional survey lines are set at the start and end points of the restoration work (the positions of B.P and E.P in the figure), the deepest part of the collapsed area (the positions indicated by "+2.0" and "+8.7" in the figure), and the change point connecting two collapsed parts (the position of "+5.2" in the figure). Note that the cross-sectional survey lines are set at least at the start and end points of the restoration work. In addition, in this embodiment, in addition to the start and end points of the restoration work, the case where cross-sectional survey lines are also set at the deepest part of the collapsed area and the change points of the collapse is shown, but it is also possible to configure to set the cross-sectional survey lines only at one of the deepest part of the collapsed area or the change points of the collapse.

[0040] Note that the setting of the cross-sectional survey lines is performed on the CAD program of the data creation support device 1. That is, the operator starts the CAD program P2 of the data creation support device 1 and uses the function of the CAD program P2 to set cross-sectional survey lines in the survey target area of the plan view generated from the point cloud mesh data D2 (see the left figure in Fig. 5). In the illustrated example, five cross-sectional survey lines of B.P, +2.0, +5.2, +8.7, and E.P are set in the plan view of the survey target area displayed as a point cloud.

[0041] When the setting of the cross-sectional survey lines for the point cloud mesh data D2 is completed, next, based on the set cross-sectional survey lines, cross-sectional views corresponding to each cross-sectional survey line are generated from the point cloud mesh data D2 (cross-sectional view generation step: see step S5 in Fig. 2).

[0042] The creation of the cross-sectional views is performed using the function of the CAD program P2. When creating the cross-sectional views at the positions where the cross-sectional survey lines are set, the operator sets information (DL value) regarding the construction reference plane (DL: Datum level) for each cross-section. The DL value is arbitrarily set, but in this embodiment, it is set with reference to the height (Z-axis coordinate value) of the road center line intersecting the cross-sectional survey line, for example, the height (Z-axis coordinate value) of the start and end points of the road center line. In the example shown in the right figure of Fig. 5, since the height of the road center line is about 410 - 411, the DL value is set to 410.

[0043] (6) When the generation of the cross-sectional view is completed, next, a secondary cross-sectional view with a reduced data volume of the generated cross-sectional view is generated (cross-sectional view lightweighting process: refer to step S6 in FIG. 2).

[0044] As shown in the left figure of FIG. 6, the cross-sectional view generated in the cross-sectional view generation process accurately reproduces the terrain of the survey target area. However, since the cross-sectional view generated from the point cloud data is a collection of innumerable fine line segments, the data volume is large, and the data volume is excessive for subsequent processing to be carried out smoothly. Therefore, in this process, the data volume is optimized, that is, the data volume is reduced, so that subsequent processing can be carried out smoothly.

[0045] Specifically, as shown in the right figure of FIG. 6, the cross-sectional view generated from the point cloud data that accurately reproduces the terrain is redrawn while being simplified using polylines or line segments to create a secondary cross-sectional view with a simplified cross-sectional view (refer to the dashed line in the right figure of FIG. 6).

[0046] This redrawing is carried out by an operator using the CAD program P2. When redrawing, in order to ensure that the cross-sectional view and the secondary cross-sectional view do not deviate, the secondary cross-sectional view is created by simplifying the unevenness in the cross-sectional view. Specifically, for example, in the cross-sectional view, the overhangs and deeply dug parts are straightened at the discretion of the operator (refer to the cross-sectional view and the secondary cross-sectional view of “+2.0” in FIG. 6). Also, for example, the joints between line segments are set at or near the change points in the cross-sectional view. Also, for example, the length of one line segment is set to about 1.0 to 2.0 m (however, it goes without saying that the length of the line segment may be less than 1.0 m in cases where there are many change points). Simplification rules such as these are set to create the secondary cross-sectional view. Note that the secondary cross-sectional view is created for all the cross-sectional views created in the cross-sectional view generation process.

[0047] (7) When the generation of the secondary cross-sectional view is completed, next, the information on the planned height of the restoration work is set in the generated secondary cross-sectional view (planned height setting process: refer to step S7 in FIG. 2).

[0048] Here, the planned height means the formation height (FH) of the road in the restoration work of the collapsed slope along the road as shown in this embodiment. In this embodiment, for the setting of the formation height FH of the road, the formation heights FH of the start and end points (B.P and E.P) of the restoration work are determined first, and then the formation heights FH of the roads in each secondary cross-sectional view between the start and end points are set.

[0049] As the formation heights FH of the start point B.P and the end point E.P of the restoration work, for example, as shown in the left figure of Fig. 7, the intersection of the secondary cross-sectional view and the center line of the road to be restored is used. Also, the formation heights FH of the measurement points +2.0, +5.2, and +8.7 between the start and end points are determined, for example, by the longitudinal gradient of the road obtained by connecting the formation heights FH of the start point B.P and the end point E.P (see the right figure of Fig. 7). In the case where the longitudinal gradient of the road has been set in advance by the client of the restoration work or the like, only the formation height FH of the start point B.P of the restoration work is determined, and the formation heights FH of the other measurement points (+2.0, +5.2, +8.7, E.P) are determined based on the pre-set longitudinal gradient of the road. Note that the information setting of the formation height FH on the secondary cross-sectional view is performed using the CAD program P2.

[0050] (8) When the setting of the formation height FH of the road is completed, next, based on the set formation height FH of the road, the information of the road planned line is set on the secondary cross-sectional view (road planned line setting step: see Fig. 2, step S8).

[0051] The road planned line is a line indicating the road surface of the road scheduled for restoration work. In this embodiment, in principle, it is set horizontally along the road planned height FH. However, if the road planned line is set mechanically, the set road planned line may be unrealistic or unreasonable. For example, as shown in the right figure of Fig. 8, when the area near the road center line is deeply excavated, if the road planned line is set based on the road planned height FH (near the intersection of the secondary cross-section and the road center line), a large amount of earth and sand that needs to be excavated above the road planned line will be included, and additional excavation work will be required to remove this earth and sand (which is unrealistic as restoration work). Therefore, in this embodiment, while setting the road planned line based on the road planned height FH, when it is inappropriate to set the road planned line based on the road planned height FH, the worker (designer) arbitrarily changes the height position of the road planned line to a reasonable position (for example, refer to the secondary cross-section of "+5.2" in the left figure of Fig. 8). Note that the setting of the road planned line is also performed using the CAD program P2 in the same manner as the setting of the road planned height FH.

[0052] (9) After the creation of the secondary cross-section, the setting of the road planned height FH, and the setting of the road planned line are completed in this way, next, the created data is organized (data organization process). This data organization is a process of selecting data suitable for processing by the construction design support program P3 described later from the data created in the previous processes and creating basic data for construction design. For example, as shown in the left figure of Fig. 9, regarding the cross-section, the data of the cross-section obtained from the point cloud mesh data D2 is deleted, and the data of the simplified secondary cross-section and the road planned height FH and road planned line of each measurement point can be displayed. Also, regarding the plan view, as shown in the right figure of Fig. 9, the point cloud mesh data D2 and the data of each measurement point can be displayed. By including the process of selecting and organizing the created data in this way, the burden on the data creation support device 1 (such as the burden of data processing) in the construction design process described later can be reduced, and subsequent work can be carried out smoothly.

[0053] When the organization of the data is completed, next, based on the organized data, the design of the restoration work is carried out (construction design process: refer to step S9 in FIG. 2).

[0054] In this process, based on the data organized in the previous process, a restoration method is selected, and the design of the construction work corresponding to the selected restoration method is carried out. Here, as the restoration method, for example, various retaining wall methods such as the basket method in which stone-filled wire mesh cages are stacked and arranged on the collapsed slope, and the block retaining wall method in which block bodies such as concrete blocks are stacked and arranged on the collapsed slope are exemplified. The worker selects a restoration method suitable for restoring the collapsed slope while referring to the data created by the data creation support device 1. In this embodiment, as the restoration method, the basket method using a stone-filled cylindrical wire mesh cage is selected.

[0055] When the restoration method is selected, the worker activates the construction design support program P3 corresponding to the selected restoration method. A dedicated program is prepared for each type of restoration work for the construction design support program P3. In this embodiment, since the basket method using a cylindrical wire mesh cage is selected as the restoration method, the worker activates the construction design support program P3 corresponding to the basket method using a cylindrical wire mesh cage, and uses this construction design support program P3 to carry out the design of the restoration work.

[0056] FIG. 10 and FIG. 11 are design drawings of the retaining wall structure using a cylindrical wire mesh cage designed by the construction design support program P3. FIG. 10 shows a plan view of the retaining wall structure and a cross-sectional view at measurement points +2.0, +5.2, and +8.7, and FIG. 11 shows a developed view of the retaining wall structure and an allocation diagram of the cylindrical wire mesh cages. That is, the retaining wall structure using a cylindrical wire mesh cage shown in FIGS. 10 and 11 has a laminated structure in which four layers of cylindrical wire mesh cages are stacked in the vertical direction. In the first stage, three cylindrical wire mesh cages are arranged on the left and right respectively corresponding to two collapsed locations (refer to FIG. 3), and in the second stage, ten cylindrical wire mesh cages are arranged in a row so as to connect the two collapsed locations. Also, in the third stage, eleven cylindrical wire mesh cages are arranged, and in the fourth stage, ten cylindrical wire mesh cages are arranged.

[0057] Thus, according to the present invention, when a slope along a road collapses, by sending workers to the collapsed site to take pictures of the collapsed area, it is possible to complete the creation of the design drawing for the restoration work on the spot and efficiently formulate the restoration plan in a short time. According to the applicant's experiments, according to the present invention, for example, it takes about 0.5 hours to take pictures of the slope collapse site, about 2 hours to create the basic data for construction design by the data creation support device 1, and about 0.5 hours to design the restoration work by the construction design support program P3, and the design of the restoration work can be completed. That is, it is possible to perform the surveying of the collapsed slope to the design of the restoration work in about several hours, and it is possible to promptly start the restoration work on the collapsed slope.

[0058] Further, according to the present invention, since the three-dimensional terrain data D1 of the collapsed slope is created based on the captured images of the survey target area including the collapsed slope, when taking pictures, by using an unmanned aircraft, a telescopic support rod for a camera, etc., it is possible to create the basic data for the restoration work design without the worker descending to the collapsed slope, so it is possible to implement the design of the restoration work while ensuring the safety of the worker.

[0059] It should be noted that the above-described embodiments merely show the preferred embodiments of the present invention, and the present invention is not limited thereto, and various design changes are possible within its scope.

[0060] For example, in the above-described embodiment, the case where the present invention is applied to the construction design of the restoration work for the slope collapse along the road is shown, but the present invention is not limited to the slope along the road and is also applicable to the restoration work of the slope without a road. For example, it is also possible to apply the present invention to the collapse of a slope along a river that is not along a road. In that case, although there is no road center line, which is one of the criteria in the restoration work, an alternative criterion such as a river center line can be set and the present invention can be applied.

[0061] In the above-described embodiment, a case where a notebook computer is used as the data creation support device 1 has been shown. However, the data creation support device 1 may be configured by a desktop computer. For example, by configuring so that an image captured by the imaging device 2 can be input to the data creation support device 1 through a network, data of an image captured at the slope collapse site can be taken into the data creation support device 1 located remotely such as a design office through the network, and it is also possible to configure to create a construction plan for the restoration work.

[0062] In the above-described embodiment, a case including a step of organizing the created data after the creation of the secondary cross-sectional view, the setting of the road planned height FH, and the setting of the road planned line has been shown. However, when the data processing ability of the data creation support device 1 is high and the construction design process can proceed smoothly without organizing the data, the data organization step can also be omitted.

[0063] In the above-described embodiment, a case where the basket method using a cylindrical wire mesh cage is selected as the restoration method for the collapsed slope has been shown. However, this is merely an example, and of course, it is also possible to select other restoration methods such as the block retaining wall method.

Explanation of Signs

[0064] 1 Data creation support device 2 Imaging device 11 Control unit 12 Storage unit 13 Input unit 14 Display unit 15 Interface unit P1 Image processing program P2 CAD program P3 Construction design support program P4 Data creation support program D1 Three-dimensional terrain data D2 Point cloud mesh data

Claims

1. A data creation support method for assisting in creating basic data for the design of restoration work for a collapsed slope, comprising: a photographing step of photographing an image for photogrammetry for a survey target area including the collapsed slope; a terrain data generation step of generating three-dimensional terrain data of the survey target area based on the image photographed in the photographing step; a mesh data generation step of generating mesh data composed of a point cloud for the survey target area based on the three-dimensional terrain data of the survey target area generated in the terrain data generation step; a cross-section line setting step of setting a cross-section line orthogonal to the collapsed slope at a plurality of positions including the start and end points of the restoration work with respect to the mesh data of the survey target area generated in the mesh data generation step; a cross-section drawing generation step of generating a cross-section drawing corresponding to each cross-section line from the mesh data of the survey target area based on the cross-section line set in the cross-section line setting step; a cross-section drawing weight reduction step of generating a secondary cross-section drawing with the data amount of the cross-section drawing generated in the cross-section drawing generation step reduced; and a planned height setting step of setting information on the planned height of the restoration work in the secondary cross-section drawing generated in the cross-section drawing weight reduction step. A data creation support method characterized by the above.

2. In the photographing step, a photographing device for photographing an image is mounted on an unmanned aerial vehicle, or a photographing device for photographing an image is arranged at the tip of a rod-shaped support member, and the survey target area is photographed from above. The data creation support method according to claim 1, characterized by the above.

3. In the cross-section line setting step, the cross-section line is set at the start and end points of the restoration work and at the deepest part of the collapse and / or the change point of the collapse between the start and end points. The data creation support method according to claim 2, characterized by the above.

4. The cross-section drawing generation step includes a step of setting a construction reference plane in the cross-section. The data creation support method according to claim 2 or 3, characterized in that

5. When the collapsed slope is a slope along a road, in the planned height setting step, the planned heights of the construction work at the start and end points of the restoration work are set based on the intersection of the secondary cross-section and the center line of the road to be restored The data creation support method according to claim 2 or 3, characterized in that

6. In the planned height setting step, the planned height of the construction work in the secondary cross-section other than the start and end points of the restoration work is set based on the road longitudinal gradient obtained by connecting the planned heights of the construction work at the start and end points of the restoration work The data creation support method according to claim 5, characterized in that

7. A data creation support device including a computer for supporting the creation of basic design data for restoration work on a collapsed slope, The computer is Based on an image for photogrammetry taken of the survey target area including the collapsed slope, generate three-dimensional terrain data of the survey target area, Based on the generated three-dimensional terrain data of the survey target area, generate mesh data consisting of a point cloud for the survey target area, For the generated mesh data of the survey target area, set transverse survey lines perpendicular to the collapsed slope at a plurality of positions including the start and end points of the restoration work, Based on the set transverse survey lines, generate cross-sections corresponding to the respective transverse survey lines from the mesh data of the survey target area, Generate a secondary cross-section with the data volume of the generated cross-section reduced, Generate basic design data for restoration work with information on the planned height of the restoration work set in the generated secondary cross-section, having a control configuration The data creation support device, characterized in that

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