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 device, and more particularly to a technique for supporting the creation of basic data for construction design in restoration work for collapsed slopes along roads. [Background technology]

[0002] In Japan, where approximately 75% of the country is mountainous, there are many roads with slopes along them. Many of these roads are important roads for local residents, so if a slope along a road collapses due to heavy rain or other factors, there is a strong desire to quickly restore the collapsed area.

[0003] Incidentally, when carrying out restoration work on a collapsed slope, a construction plan is formulated following a procedure that involves surveying the collapsed area, selecting a restoration method based on the survey results, and designing the work content in accordance with the selected restoration method. However, when the slope collapse is small-scale (small-scale collapse), the collapsed area is generally surveyed using pole surveying, which makes it easy to transport equipment to the collapse site and allows the survey to be carried out by a small number of people (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2008-20367 Summary of the Invention [Problem to be solved by the invention]

[0005] However, such conventional methods have the following problems, and solutions to these problems have been desired.

[0006] In other words, when conducting pole surveys of collapsed areas, survey workers must descend onto the collapsed slope to carry out the surveying work, but the collapsed slope often has poor footing, making it difficult for workers to enter.In addition, there is also the risk of further slope collapses or workers falling, making it difficult to ensure the safety of workers involved in the surveying work.

[0007] Furthermore, with pole surveying, it is necessary to compile the survey results and transcribe them into drawings (drafting work). Depending on the scale of the slope collapse, these tasks usually take several days, so it is not possible to select a restoration method or design the work until these tasks are completed. Therefore, if the collapsed area was surveyed using pole surveying, the work efficiency would be low, which would lead to delays in the start of restoration work.

[0008] The present invention has been made in consideration of these problems, and its purpose is to provide a data creation support method and a data creation support device that support the creation of basic data for restoration work design, which enables restoration plans to be formulated efficiently while ensuring the safety of surveying workers. [Means for solving the problem]

[0009] In order to achieve the above object, a data creation support method according to the present invention comprises: A data creation support method for supporting the creation of basic design data for restoration work on a collapsed slope, comprising: a photographing step of photographing images for photogrammetry of a survey target area including the collapsed slope; a topographical data generating step of generating three-dimensional topographical data of the area to be surveyed based on the images captured in the photographing step; a mesh data generation step of generating mesh data consisting of a point cloud for the area to be surveyed based on the three-dimensional topographical data of the area to be surveyed generated in the topographical data generation step; a transverse survey line setting step for setting transverse survey lines perpendicular to the collapsed slope at a plurality of positions including the start and end points of the restoration work in the mesh data of the survey target area generated in the mesh data generating step; a cross-sectional view generating step of generating a cross-sectional view corresponding to each cross-sectional measurement line from mesh data of the survey target area based on the cross-sectional measurement lines set in the cross-sectional measurement line setting step; a cross-sectional view reduction step for generating a secondary cross-sectional view by reducing the amount of data of the cross-sectional view generated in the cross-sectional view generation step; a planned height setting process for setting information on the planned height of the restoration work in the secondary cross section created in the cross section weight reduction process; And so, The planned height setting step sets the planned height of the construction work at the start and end points of the restoration work based on the intersection of the secondary cross section and the road center line of the road to be restored, when the collapsed slope is a slope along a road. It is characterized by:

[0010] As a preferred embodiment, the present invention has the following features. (1) In the photographing process, a photographing device for photographing images is mounted on an unmanned aerial vehicle, or a photographing device for photographing images is placed at the tip of a rod-shaped support member, and the area to be surveyed is photographed from above.

[0011] (2) The transverse survey line setting step sets the transverse survey line 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.

[0012] (3) The cross-sectional view generating step includes a step of setting a construction reference plane on the cross-sectional view.

[0014] ( 4 ) The planned height setting process is characterized in that the planned height of the construction work in the secondary cross section other than the starting and ending 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 starting and ending points of the restoration work.

[0015] Furthermore, the data creation support device according to the present invention comprises: 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 generating three-dimensional topographical data of the survey target area based on photogrammetric images taken of the survey target area including the collapsed slope; generating mesh data consisting of a point cloud for the area to be surveyed based on the generated three-dimensional topographical data of the area to be surveyed; In the generated mesh data of the survey 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; generating cross-sectional views corresponding to the cross-sectional survey lines from mesh data of the survey target area based on the set cross-sectional survey lines; A secondary cross section is generated that reduces the amount of data of the generated cross section. Set the planned height information for restoration work on the generated secondary cross section In carrying out this work, if the collapsed slope is a slope along a road, the planned height of the construction work at the start and end points of the restoration work is set based on the intersection of the secondary cross section and the center line of the road to be restored. It is characterized by having a control configuration that generates basic data for designing restoration work. [Effects of the Invention]

[0016] According to the present invention, when formulating a restoration plan (selection and design of restoration methods) for a collapsed slope, the basic data used to design the restoration method is created based on photographic images of the survey area including the collapsed slope, so that the basic data for designing the restoration method can be created safely without survey workers having to descend onto the collapsed slope.

[0017] Furthermore, since the foundation data is created by processing three-dimensional topographical data generated from images, it can be created using a computer. This allows the process from images to the creation of foundation data used in designing restoration methods to be completed efficiently and in a short time. This makes it possible to start restoration work in a short time after a slope collapse. [Brief explanation of the drawings]

[0018] [Figure 1] 1 is a block diagram showing an example of a schematic configuration of a data creation support device according to the present invention; [Figure 2] 10 is a flowchart showing an example of a procedure for creating basic data for construction design in restoration work on a collapsed slope using the data creation support device. [Figure 3]2 is an explanatory diagram showing an example of three-dimensional topographical data of a survey target area created by the data creation support device. FIG. [Figure 4] 3 is an explanatory diagram showing an example of point cloud mesh data of a survey target area created by the data creation support device. FIG. [Figure 5] 10 is an explanatory diagram showing an example of a cross-sectional view created from point cloud mesh data by the data creation support device. FIG. [Figure 6] 10 is an explanatory diagram showing an example of weight reduction of a cross-sectional view by the data creation support device. FIG. [Figure 7] 10 is an explanatory diagram showing an example of a road planning elevation set in a cross section by the data creation support device. FIG. [Figure 8] 3 is an explanatory diagram showing an example of a road planning line set in a cross-sectional view by the data creation support device. FIG. [Figure 9] 10 is an explanatory diagram showing an example of basic design data that is handed over to a construction design support program by the data creation support device. FIG. [Figure 10] 1 is an explanatory diagram showing an example of automatic design of restoration work using the construction design support program of the data creation support device, showing a plan view and a cross-sectional view showing the arrangement of cylindrical wire mesh cages. [Figure 11] 1 is an explanatory diagram showing an example of automatic design of restoration work using the construction design support program of the data creation support device, showing a development diagram and a layout diagram showing the arrangement of cylindrical wire mesh cages. DETAILED DESCRIPTION OF THE INVENTION

[0019] A data creation support device 1 according to the present invention will be described in detail below with reference to the drawings. Note that the same reference numerals throughout the drawings denote the same components or elements.

[0020] The data creation support device 1 of the present invention is a device that supports the creation of basic data for construction design in restoration work on collapsed slopes, such as slopes along roads or rivers, and is composed of a portable computer such as a tablet computer, notebook computer, or smartphone that can execute a predetermined program described below.

[0021] In this embodiment, a notebook computer is used as the data creation support device 1, and this data creation support device 1 is used to create data suitable for processing by the construction design support program P3 described below from images captured by the photographing device 2.

[0022] FIG. 1 shows the general configuration of the data creation support device 1. As shown in the figure, the data creation support device 1 has, as its main components, a control unit 11, a memory 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 memory unit 12, and includes as its main components a CPU (Central Processing Unit), ROM (Read Only Memory), RAM (Random Access Memory), I / O ports, etc., all of which are not shown.

[0024] The storage unit 12 is an auxiliary storage device that stores programs, data, etc., and is configured, for example, with an HDD (Hard Disk Drive), an SSD (Solid State Drive), etc. In this embodiment, the storage unit 12 stores 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, as well as various data used in these application programs (details will be described later).

[0025] The input unit 13 is an input device for inputting information to the control unit 11, and is composed of, for example, a keyboard for inputting letters and numbers, or a pointing device such as a touchpad for inputting coordinates on the screen of the display unit 14. The display unit 14 is a display device for displaying letters and figures, and is composed of, for example, a liquid crystal display such as a TFT liquid crystal display, an organic EL display, or the like. Note that by employing a touch panel display as the display unit 14, the display unit 14 may serve as all or part of the input unit 13.

[0026] The interface unit 15 is an interface that directly or indirectly connects the data creation support device 1 to an external device, and examples thereof include wired interfaces such as USB (Universal Serial Bus) and RS485, as well as wireless interfaces such as Bluetooth (registered trademark) and NFC (Near Field Communication). The interface unit 15 may also be configured as a network interface compatible with a wired or wireless LAN (Local Area Network). Furthermore, the interface unit 15 may also be configured as a recording medium reader such as an SD card reader. In this embodiment, a wired interface such as a USB port is used as the interface unit 15, and image data is input from the photographing device 2 via the interface unit 15.

[0027] The photographing device 2 is a device that generates images (image data) used to create basic data for construction design in the data creation support device 1, and in this embodiment, a small, lightweight, and easily portable digital camera such as a smartphone camera or a compact digital camera for home use is used. The reason for using such a small, lightweight digital camera is that the photographing device 2 is used to take photographs for photogrammetry of the survey target area, including the collapsed slope, and therefore a small, lightweight digital camera that is suitable for mounting on an unmanned aerial vehicle (drone) or on the tip of an extendable camera support rod (rod-shaped support member) is preferably used.

[0028] The image capture device 2 is also equipped with a satellite positioning system, and position information (image capture position information) measured by the satellite positioning system is added to captured images. Specifically, for example, a global navigation satellite system (GNSS: Global Navigation Satellite System), which is a global satellite positioning system, is employed as the satellite positioning system. Furthermore, for positioning, a relative positioning (RTK (Real Time Kinematic)) method is preferably employed, in which the image capture device 2 (e.g., a GNSS-compatible smartphone) serves as a mobile station and a mobile phone base station or the like serves as a fixed station (reference station). As is well known, the relative positioning method uses two receivers, a mobile station and a fixed station, to receive signals from four or more satellites for positioning. Therefore, more accurate position information can be obtained than with standalone positioning using only a mobile station. Therefore, in this embodiment, the image data of a collapsed slope includes detailed position information of the location where the collapse occurred.

[0029] Next, the procedure for creating data using the data creation support device 1 configured as above will be explained with reference to Figures 2 to 11. The procedure shown in Figures 2 to 11 illustrates 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 (especially a small-scale collapse) due to heavy rain or an earthquake, workers are dispatched to the site of the slope collapse and are asked to take images for photogrammetry of the designated survey area, including the location of the slope collapse (photography process: see step S1 in Figure 2).

[0031] Here, the area to be surveyed is the area that includes the collapsed slope, or more specifically, an area that covers a wider area that includes both the starting point and the end point (start-end point) of the restoration work for the collapsed area. Photographs of the area to be surveyed are taken by workers using a camera device 2. Specifically, the camera device 2 is mounted on an unmanned aerial vehicle such as a drone and flies over the collapsed area to take photographs, or the camera device 2 is attached to the end of an extendable camera support rod (rod-shaped support member) and the tip of the support rod is extended above the collapsed area to take photographs, thereby photographing the collapsed area from above as if looking down. This allows workers to take images for photogrammetry without descending onto the collapsed slope, ensuring their safety.

[0032] (2) Once the image capturing of the area to be surveyed is completed, three-dimensional topographical data D1 of the area to be surveyed is generated based on the captured image (topographical data generating step: see step S2 in FIG. 2).

[0033] The three-dimensional topographical data D1 is generated by the data creation support device 1. A worker starts the data creation support program P4 of the data creation support device 1 and executes the procedure described below in accordance with instructions from the started data creation support program P4, for example, instructions displayed on the display unit 14. That is, the worker inputs a photographed image into the data creation support device 1 to generate the three-dimensional topographical data D1. Specifically, the worker inputs the photographed image into the data creation support device 1, starts the image processing program P1 of the data creation support device 1, and generates the three-dimensional topographical data D1 from the image data using the image processing program P1. The image processing program P1 analyzes the photographic image data and generates the three-dimensional topographical data D1 from the photographic image. The three-dimensional topographical data D1 includes three-dimensional (3D) coordinate data of the X-axis, Y-axis, and Z-axis (length, width, and height).

[0034] Figure 3 shows an example of a plan view based on three-dimensional topographical data D1 created by the image processing program P1. According to this three-dimensional topographical data D1, as shown in the figure, the survey area includes two collapsed areas (slope collapse areas) along the road.

[0035] (3) Once the generation of the three-dimensional topographical data D1 is complete, the worker then generates mesh data (point cloud mesh data) D2 consisting of a cloud of points for the area to be surveyed based on the three-dimensional topographical data D1 of the area to be surveyed (mesh data generation process: see step S3 in Figure 2).

[0036] The point cloud mesh data D2 is created using an image processing program P1. Figure 4 shows the point cloud mesh data D2 generated from the three-dimensional topographic data D1 of the area to be surveyed. In Figure 4, the dashed dotted line drawn vertically on the page indicates the center line of the road adjacent to the collapsed slope (road center line), and the solid lines drawn on either side of this road center line indicate the width of the road.

[0037] (4) Once the creation of the point cloud mesh data D2 is complete, the worker then sets transverse survey lines perpendicular to the collapsed slope (specifically, perpendicular to the road centerline) at multiple positions in the point cloud mesh data D2 of the area to be surveyed, including the start and end points of the restoration work (start point BP and end point EP) (transverse survey line setting process: see step S4 in Figure 2).

[0038] Here, the start and end points of the restoration work are determined by the workers who design the restoration work, referring to photographic images of the area to be surveyed and the three-dimensional topographical data D1. For example, the point cloud mesh data D2 shown in Figure 4 includes two collapsed areas (failed locations), as described above, so the start point BP and end point EP of the restoration work are set so that these two collapsed locations are included between the start and end points of the restoration work (between BP and EP).

[0039] Meanwhile, transverse measurement lines are set arbitrarily, for example, at the deepest part of the collapsed area or the change point of the collapse, in addition to the start and end points of the restoration work described above. In the illustrated example, transverse measurement lines are set at the start and end points of the restoration work (the positions of BP and EP 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 areas (the position indicated by "+5.2" in the figure). Note that transverse measurement lines are set at at least the start and end points of the restoration work. Furthermore, in this embodiment, a case has been shown in which transverse measurement lines are set at the deepest part of the collapsed area and the change point of the collapse, in addition to the start and end points of the restoration work, but it is also possible to configure the transverse measurement lines to be set only at either the deepest part of the collapsed area or the change point of the collapse.

[0040] The transverse measurement lines are set on the CAD program of the data creation support device 1. That is, the worker starts up the CAD program P2 of the data creation support device 1 and uses the functions of the CAD program P2 to set the transverse measurement lines in the survey target area of ​​the plan view generated from the point cloud mesh data D2 (see the diagram on the left side of FIG. 5). In the illustrated example, five transverse measurement lines, BP, +2.0, +5.2, +8.7, and EP, are set on the plan view of the survey target area displayed as a point cloud.

[0041] (5) Once the setting of the cross-sectional survey lines for the point cloud mesh data D2 is completed, a cross-sectional view corresponding to each cross-sectional survey line is generated from the point cloud mesh data D2 based on the set cross-sectional survey lines (cross-sectional view generation process: see step S5 in Figure 2).

[0042] The cross-sections are created using the functions of the CAD program P2. When creating a cross-sectional view of a location where a cross-sectional measurement line has been set, a worker sets information (DL value) relating to the construction datum level (DL) for each cross-sectional surface. The DL value can be set arbitrarily, but in this embodiment, it is set with reference to the height (Z-axis coordinate value) of the road centerline that intersects with the cross-sectional measurement line, for example, the heights of the start and end points of the road centerline (Z-axis coordinate value). In the example shown on the right side of Figure 5, the height of the road centerline is approximately 410 to 411, so the DL value is set to 410.

[0043] (6) After the generation of the cross section is completed, a secondary cross section is generated by reducing the amount of data of the generated cross section (cross section reduction step: see step S6 in FIG. 2).

[0044] The cross-section generated in the cross-section generation process accurately reproduces the topography of the survey area, as shown in the left image of Figure 6. However, because the cross-section generated from point cloud data is a collection of countless fine line segments, the data volume is large, making it too large for smooth subsequent processing. Therefore, this process optimizes the data volume, that is, reduces the data volume, to enable smooth subsequent processing.

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

[0046] This redrawing is performed by a worker using the CAD program P2. To ensure that the cross-sectional view and secondary cross-sectional view do not diverge, the secondary cross-sectional view is created by simplifying the irregularities in the cross-sectional view. Specifically, for example, overhangs or deep excavations in the cross-sectional view are straightened at the worker's discretion (see the cross-sectional view and secondary cross-sectional view of "+2.0" in Figure 6). Furthermore, for example, the junctions between line segments are set at or near the change points in the cross-sectional view. Furthermore, the secondary cross-sectional view is created by setting simplification rules, such as setting the length of each line segment to approximately 1.0 to 2.0 m (however, if there are many change points, the length of the line segment can of course be less than 1.0 m). Secondary cross-sectional views are created for all cross-sectional views created in the cross-sectional view generation process.

[0047] (7) Once the generation of the secondary cross section is complete, next, information on the planned height of the restoration work is set in the generated secondary cross section (planned height setting step: see step S7 in FIG. 2).

[0048] Here, the planned height refers to the road planned height FH (Formation Height) in restoration work on a collapsed slope along a road as shown in this embodiment. In this embodiment, the road planned height FH is set by first determining the road planned height FH of the start and end points (BP and EP) of the restoration work, and then setting the road planned height FH of each secondary cross section between the start and end points.

[0049] The road design height FH of the starting point BP and ending point EP of the restoration work is determined by the intersection of the secondary cross section and the road centerline of the road to be restored, as shown in the left diagram of Figure 7. The road design height FH of each measurement point between the starting point and ending point, such as +2.0, +5.2, and +8.7, is determined by the road longitudinal gradient obtained by connecting the road design height FH of the starting point BP and the ending point EP (see the right diagram of Figure 7). If the road longitudinal gradient is preset by the client of the restoration work, only the road design height FH of the starting point BP of the restoration work is determined, and the road design heights FH of the other measurement points (+2.0, +5.2, +8.7, EP) are determined based on the preset road longitudinal gradient. The road design height FH information is entered into the secondary cross section using the CAD program P2.

[0050] (8) Once the road planning height FH has been set, next, road planning line information is set in the secondary cross section based on the set road planning height FH (road planning line setting process: see step S8 in Figure 2).

[0051] Road plan lines indicate the road surface of the road planned for restoration work. In this embodiment, they are generally set horizontally along the road plan height FH. However, mechanically setting road plan lines can result in unrealistic or irrational results. For example, as shown in the right diagram of Figure 8, if the area near the road centerline is deeply excavated, setting the road plan line based on the road plan height FH (near the intersection of the secondary cross section and the road centerline) would result in a large amount of soil and sand requiring excavation above the road plan line, necessitating additional excavation work to remove this soil and sand (unrealistic for restoration work). Therefore, in this embodiment, road plan lines are set based on the road plan height FH. However, if setting the road plan line based on the road plan height FH is inappropriate, the worker (designer) can arbitrarily change the height position of the road plan line to a more reasonable position (for example, see the secondary cross section at "+5.2" in the left diagram of Figure 8). Note that setting the road plan line is also performed using the CAD program P2, similar to setting the road plan height FH.

[0052] (9) After the creation of the secondary cross section, the setting of the road plan height FH, and the setting of the road plan line are completed in this manner, the next step is to organize the created data (data organization process). This data organization process selects data suitable for processing by the construction design support program P3 (described later) from the data created in the previous processes to create basic data for construction design. For example, as shown in the left diagram of Figure 9, for cross sections, the cross section data obtained from the point cloud mesh data D2 is deleted, and simplified data for the secondary cross section, the road plan height FH at each measurement point, and the road plan line are displayed. Furthermore, for plan views, as shown in the right diagram of Figure 9, the point cloud mesh data D2 and data for each measurement point are displayed. In this way, including the process of selecting and organizing the created data reduces the burden (such as data processing burden) on the data creation support device 1 in the construction design process (described later), allowing subsequent work to be performed more smoothly.

[0053] (10) Once the data organization is complete, the restoration work is designed based on the organized data (construction design process: see step S9 in Figure 2).

[0054] In this step, a restoration method is selected based on the data compiled in the previous step, and construction work is designed according to the selected restoration method. Examples of restoration methods include various retaining wall methods, such as the cage method, in which stone-filled wire mesh cages are stacked on the collapsed slope, and the block retaining wall method, in which concrete blocks or other blocks are stacked on the collapsed slope. 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, the cage method, which uses stone-filled cylindrical wire mesh cages, is selected as the restoration method.

[0055] Once a restoration method is selected, the worker launches the construction design support program P3 corresponding to the selected restoration method. A dedicated construction design support program P3 is provided for each type of restoration work. In this embodiment, the cage method using a cylindrical wire mesh basket is selected as the restoration method, so the worker launches the construction design support program P3 corresponding to the cage method using a cylindrical wire mesh basket and uses this construction design support program P3 to design the restoration work.

[0056] Figures 10 and 11 are design drawings of a retaining wall structure made of cylindrical wire mesh cages, designed using the construction design support program P3. Figure 10 shows a plan view of the retaining wall structure and cross sections at measurement points +2.0, +5.2, and +8.7, while Figure 11 shows an exploded view of the retaining wall structure and a layout of the cages. The cylindrical wire mesh cage retaining wall structure shown in Figures 10 and 11 has a layered structure with four layers of cages stacked vertically. The first layer has three cages on each side, corresponding to the two collapsed areas (see Figure 3). The second layer has ten cages arranged in a row connecting the two collapsed areas. The third layer has eleven cages, and the fourth layer has ten cages.

[0057] Thus, according to the present invention, when a slope along a road collapses, workers can be dispatched to the collapsed site to photograph the collapsed area, allowing the creation of restoration work design drawings on the spot, thereby enabling the efficient formulation of a restoration plan in a short time. Experiments conducted by the applicant have shown that, according to the present invention, it takes only about 0.5 hours to photograph the collapsed slope, about 2 hours to create basic data for construction design using the data creation support device 1, and about 0.5 hours to design the restoration work using the construction design support program P3. In other words, the process from surveying the collapsed slope to designing the restoration work can be completed in just a few hours, allowing restoration work on the collapsed slope to begin promptly.

[0058] Furthermore, according to the present invention, the three-dimensional topographical data D1 of the collapsed slope is created based on photographs of the survey target area including the collapsed slope. Therefore, by using an unmanned aerial vehicle or an extendable camera support rod for taking photographs, basic data for designing restoration work can be created without workers having to descend onto the collapsed slope, and therefore the restoration work can be designed while ensuring the safety of workers.

[0059] The above-described embodiments are merely preferred embodiments of the present invention, and the present invention is not limited to these, and various design modifications are possible within the scope of the present invention.

[0060] For example, in the above-described embodiment, the present invention is applied to the construction design of restoration work for a slope collapse along a road. However, the present invention is not limited to slopes along roads, but can also be applied to restoration work on slopes without roads. For example, the present invention can also be applied to slope collapses along rivers that are not along roads. In such cases, there is no road centerline to serve as one of the standards for restoration work, but the present invention can be applied by setting an alternative standard, such as the centerline of a river.

[0061] Furthermore, in the above-described embodiment, a notebook computer is used as the data creation support device 1, but the data creation support device 1 may also be configured as a desktop computer. For example, by configuring the device so that images captured by the image capture device 2 can be input to the data creation support device 1 via a network, it is possible to import image data captured at a slope collapse site via the network into the data creation support device 1 located in a remote location such as a design office, and create a construction plan for restoration work.

[0062] Furthermore, in the above-described embodiment, a process of organizing the created data is included after the creation of the secondary cross section, the setting of the road planning height FH, and the setting of the road planning line are completed. However, if the data processing capability of the data creation support device 1 is high and the construction design process can proceed smoothly without organizing the data, the data organizing process can be omitted.

[0063] Furthermore, in the above-described embodiment, the cage method using cylindrical wire mesh cages was selected as the restoration method for the collapsed slope, but this is merely an example, and it is of course possible to select other restoration methods, such as the block retaining wall method. [Explanation of symbols]

[0064] 1. Data creation support device 2. Imaging equipment 11 Control section 12 Storage section 13 Input section 14 Display section 15 Interface section P1 Image Processing Program P2 CAD program P3 Construction design support program P4 Data Creation Support Program D1 3D topographic data D2 point cloud mesh data

Claims

1. A data creation support method for supporting the creation of basic design data for restoration work on a collapsed slope, comprising: a photographing step of photographing images for photogrammetry of a survey target area including the collapsed slope; a topographical data generating step of generating three-dimensional topographical data of the area to be surveyed based on the images captured in the photographing step; a mesh data generation step of generating mesh data consisting of a point cloud for the area to be surveyed based on the three-dimensional topographical data of the area to be surveyed generated in the topographical data generation step; a transverse survey line setting step of setting transverse survey lines perpendicular to the collapsed slope at a plurality of positions including the start and end points of the restoration work in the mesh data of the survey target area generated in the mesh data generating step; a cross-sectional view generating step of generating a cross-sectional view corresponding to each cross-sectional measurement line from mesh data of the survey target area based on the cross-sectional measurement lines set in the cross-sectional measurement line setting step; a cross-sectional view reduction step of generating a secondary cross-sectional view by reducing the amount of data of the cross-sectional view generated in the cross-sectional view generation step; 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 cross-sectional view weighting process, In the case where the collapsed slope is a slope along a road, the planned height setting step sets a planned height of the construction work at the start and end points of the restoration work based on the intersection of the secondary cross section and the road center line of the road to be restored. A data creation support method comprising:

2. The photographing step involves mounting a photographing device for photographing images on an unmanned aerial vehicle or placing a photographing device for photographing images at the tip of a rod-shaped support member, and photographing the area to be surveyed from above.

2. The data creation support method according to claim 1.

3. The cross-sectional measurement line setting step sets the cross-sectional measurement line 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.

3. The data creation support method according to claim 2.

4. The cross-sectional view generation step includes a step of setting a construction reference plane on the cross-sectional view.

4. The data creation support method according to claim 2 or 3.

5. The planned height setting step sets the planned height of the construction in the secondary cross section other than the start and end points of the restoration work based on the road longitudinal gradient obtained by connecting the planned heights of the construction at the start and end points of the restoration work.

2. The data creation support method according to claim 1.

6. 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 generating three-dimensional topographical data of the survey target area based on photogrammetric images taken of the survey target area including the collapsed slope; generating mesh data consisting of a point cloud for the area to be surveyed based on the generated three-dimensional topographical data of the area to be surveyed; In the generated mesh data of the survey 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; generating cross-sectional views corresponding to the cross-sectional survey lines from mesh data of the survey target area based on the set cross-sectional survey lines; A secondary cross section is generated that reduces the amount of data of the generated cross section. When setting information on the planned height of the restoration work in the generated secondary cross section, if the collapsed slope is a slope along a road, the planned height of the work at the start and end points of the restoration work is set based on the intersection between the secondary cross section and the center line of the road to be restored, and basic data for designing the restoration work is generated. A data creation support device characterized by:

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