Protection device design method and system based on BIM technology

Abstract

The invention discloses a protection device design method and system based on a BIM technology. The method comprises the following steps: photographing and scanning a target slope through an unmanned aerial vehicle to obtain contour data of the target slope and image data corresponding to the contour data; performing BIM modeling on the target slope according to the contour data to form a slope model; obtaining a risk source of the target slope according to the image data, and mapping the risk source to a slope model; and calculating an expected risk of each risk source according to the position of the risk source on the slope model, and designing a protection device of the target slope according to the expected risk. The method can be applied to the protection design of various high slopes, the manual investigation part in the slope investigation process is reduced, the risk caused by manual investigation is effectively reduced, the risk source identification efficiency is improved, the effectiveness of the subsequent protection design is ensured, and the slope protection efficiency is improved.

Description

Technical Field

[0001] The present invention relates to computer-aided design technology, and particularly to a design method and system for a protection device based on BIM technology. Background Art

[0002] Dangerous rocks generally refer to rock masses on cliffs or steep slopes that are cut by multiple sets of structural planes and are in an unstable, sub-stable or limit equilibrium state under the action of gravity, weathering agents, in-situ stress, earthquakes, fissure water pressure, etc. Once the dangerous rocks become unstable and form collapses and rockfalls, it may lead to catastrophic consequences and cause serious losses. In some mountainous areas, due to high mountains, deep valleys, steep terrains, developed vegetation, strong tectonics, and widespread occurrence of dangerous rocks, it is difficult to find out the distribution, structural structure, etc. of dangerous rocks by conventional survey methods, which in turn affects the generation of subsequent design schemes. Summary of the Invention

[0003] In order to at least overcome the above deficiencies in the prior art, the purpose of the present application is to provide a design method and system for a protection device based on BIM technology.

[0004] In a first aspect, an embodiment of the present application provides a design method for a protection device based on BIM technology, including: Taking pictures and scanning a target slope by a drone to obtain contour data of the target slope and image data corresponding to the contour data; Performing BIM modeling on the target slope according to the contour data to form a slope model; Obtaining risk sources of the target slope according to the image data and mapping the risk sources to the slope model; Calculating the expected risk of each risk source according to the position of the risk source on the slope model, and designing a protection device for the target slope according to the expected risk.

[0005] When the embodiment of the present application is implemented, for the target slope, it is necessary to take pictures and scans through a drone to obtain corresponding contour data and image data, where the contour data can be used for BIM modeling of the slope. For a drone that combines taking pictures and scans, the data obtained by taking pictures and scans has a corresponding relationship. Therefore, after obtaining the risk source through the image data, the position of the risk source in the image can be mapped to the contour data and further mapped to the slope model. The risk source obtained through image processing can calculate the expected risk generated by the risk source. In the embodiment of the present application, the expected risk is the rockfall risk, that is, the possible rockfall trajectory is calculated according to the position where the risk source is located, so as to further design the protection device. Through the above technical means, the present application can be applied to the protection design of various high slopes, reducing the manual exploration part in the slope exploration process, effectively reducing the risks caused by manual exploration, and improving the risk source identification efficiency, ensuring the effectiveness of subsequent protection design, and improving the slope protection efficiency.

[0006] In a possible implementation manner, obtaining the risk source of the target slope according to the image data and mapping the risk source to the slope model includes: Performing image detection on the image data to identify the risk source; Obtaining the position information of the risk source in the image data, and marking the risk source in the corresponding contour data through the position information; Mapping the risk source marked in the contour data to the slope model.

[0007] In a possible implementation manner, performing image detection on the image data to identify the risk source includes: Identifying the abnormal area on the slope surface of the image data through edge detection; the abnormal area is the area where the difference between the pixel value and the pixel values of the surrounding areas is less than a preset value, and the preset value is a negative value; Obtaining the rockfall area within the area below the slope toe of the image data as the actual rockfall area; Identifying the risk source according to the abnormal area and the actual rockfall area.

[0008] In a possible implementation manner, identifying the risk source according to the abnormal area and the actual rockfall area includes: Taking the abnormal area as the first risk source, and calculating the rockfall area generated by the first risk source as the first rockfall area; Taking the part of the actual rockfall area that does not overlap with the first rockfall area as the second rockfall area; Performing rockfall inversion according to the second rockfall area to generate the corresponding second risk source; Take the first risk source and the second risk source as the risk sources.

[0009] In a possible implementation manner, generating a corresponding second risk source by performing rockfall inversion according to the second rockfall area includes: Obtain at least two of the first rockfall areas closest to the second rockfall area as matching rockfall areas matching the second rockfall area; Obtain the central point coordinates of the second rockfall area in the image data as the second central point coordinates, and obtain the central point coordinates of the matching rockfall area corresponding to the second rockfall area in the image data as the first central point coordinates; Calculate the horizontal coordinate gradient between the second central point coordinates and all the first central point coordinates, and calculate the vertical coordinate gradient between the second central point coordinates and all the first central point coordinates; Interpolate the coordinates of the first risk source corresponding to the matching rockfall area according to the horizontal coordinate gradient to obtain the horizontal coordinates of the second risk source, and interpolate the coordinates of the first risk source corresponding to the matching rockfall area according to the vertical coordinate gradient to obtain the vertical coordinates of the second risk source; Determine the position of the second risk source according to the horizontal coordinates of the second risk source and the vertical coordinates of the second risk source.

[0010] In a possible implementation manner, calculate the expected risk of each risk source according to the position of the risk source on the slope model, and design a protection device for the target slope according to the expected risk.

[0011] Calculate the rockfall trajectory of the risk source as the expected risk of the risk source; Design a protection device for the target slope according to the rockfall trajectory.

[0012] In a second aspect, an embodiment of the present application further provides a protection device design system based on BIM technology, including: An acquisition unit configured to photograph and scan a target slope by a drone to obtain contour data of the target slope and image data corresponding to the contour data; A modeling unit configured to perform BIM modeling on the target slope according to the contour data to form a slope model; A mapping unit configured to obtain risk sources of the target slope according to the image data and map the risk sources to the slope model; A design unit configured to calculate the expected risk of each risk source according to the position of the risk source on the slope model, and design a protection device for the target slope according to the expected risk.

[0013] In a possible implementation, the mapping unit is further configured to: Perform image detection on the image data to identify risk sources; Obtain the position information of the risk sources in the image data, and mark the risk sources in the corresponding contour data through the position information; Map the risk sources marked in the contour data to the slope model.

[0014] In a possible implementation, the mapping unit is further configured to: Identify abnormal areas on the slope surface of the slope in the image data through edge detection; the abnormal areas are areas where the difference between the pixel values and the pixel values of the surrounding areas is less than a preset value, and the preset value is negative; Obtain the rockfall area within the area below the slope toe in the image data as the actual rockfall area; Identify the risk sources based on the abnormal areas and the actual rockfall area.

[0015] In a possible implementation, the mapping unit is further configured to: Take the abnormal areas as the first risk sources, and calculate the rockfall areas generated by the first risk sources as the first rockfall areas; Take the part of the actual rockfall area that does not overlap with the first rockfall area as the second rockfall area; Perform rockfall inversion based on the second rockfall area to generate corresponding second risk sources; Take the first risk sources and the second risk sources as the risk sources.

[0016] Compared with the prior art, the present invention has the following advantages and beneficial effects: The protection device design method and system based on the BIM technology of the present invention can be applied to the protection design of various high slopes, reduce the manual exploration part in the slope exploration process, effectively reduce the risks caused by manual exploration, improve the risk source identification efficiency, ensure the effectiveness of subsequent protection design, and improve the slope protection efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The drawings described herein are used to provide a further understanding of the embodiments of the present invention, form a part of this application, and do not constitute a limitation to the embodiments of the present invention. In the drawings: Figure 1 It is a schematic diagram of the method steps of the embodiment of this application; Figure 2 It is a schematic diagram of risk source identification of the embodiment of this application. DETAILED DESCRIPTION

[0018] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions in the embodiments of this application will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of this application. It should be understood that the accompanying drawings in this application are only for the purposes of illustration and description, and are not used to limit the protection scope of this application. Additionally, it should be understood that the schematic drawings are not drawn to scale. The flowcharts used in this application illustrate the operations implemented according to some embodiments of the embodiments of this application. It should be understood that the operations in the flowchart may not be implemented in sequence, and steps without a logical context relationship may be reversed or implemented simultaneously. Furthermore, those skilled in the art can add one or more other operations to the flowchart or remove one or more operations from the flowchart under the guidance of the content of this application.

[0019] In addition, the described embodiments are only some of the embodiments of this application, not all of the embodiments. The components of the embodiments of this application described and illustrated in the accompanying drawings here can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of this application claimed, but merely represents the selected embodiments of this application. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative efforts belong to the scope of protection of this application.

[0020] Please refer to Figure 1 , which shows a schematic diagram of the method steps of the design method of the protection device based on the BIM technology in the embodiments of this application. Further, the design method of the protection device based on the BIM technology includes the following steps shown in S1~S4: S1: Use a drone to take pictures and scan the target slope to obtain the contour data of the target slope and the image data corresponding to the contour data; S2: Perform BIM modeling on the target slope according to the contour data to form a slope model; S3: Obtain the risk sources of the target slope according to the image data, and map the risk sources to the slope model; S4: Calculate the expected risk of each risk source according to the position of the risk source on the slope model, and design the protection device for the target slope according to the expected risk.

[0021] When the embodiment of the present application is implemented, for the target slope, it is necessary to take pictures and scans through a drone to obtain corresponding contour data and image data, where the contour data can be used for BIM modeling of the slope. For a drone that integrates taking pictures and scans, the data obtained by taking pictures and scans has a corresponding relationship. Therefore, after obtaining the risk sources through the image data, the positions of the risk sources in the image can be mapped to the contour data and further mapped to the slope model. The risk sources obtained through image processing can calculate the expected risks generated by the risk sources. In the embodiment of the present application, the expected risk is the rockfall risk, that is, the possible rockfall trajectories are calculated according to the positions where the risk sources are located, so as to further design the protection devices. Through the above technical means, the present application can be applied to the protection design of various high slopes, reducing the manual exploration part in the slope exploration process, effectively reducing the risks caused by manual exploration, improving the risk source identification efficiency, ensuring the effectiveness of subsequent protection design, and improving the slope protection efficiency.

[0022] In a possible implementation manner, obtaining the risk sources of the target slope according to the image data and mapping the risk sources to the slope model includes: Performing image detection on the image data to identify risk sources; Obtaining the position information of the risk sources in the image data, and marking the risk sources in the corresponding contour data through the position information; Mapping the risk sources marked in the contour data to the slope model.

[0023] When the embodiment of the present application is implemented, during the scanning and picture-taking process of the drone, the scanning data and the picture-taking data will correspond to corresponding flight data. The drone generates and stitches the contour data and the image data based on these data, which belongs to the prior art and is not limited in detail in the embodiment of the present application. Based on these generated image data, risk sources can be identified through image detection. The corresponding positions of the risk sources in the image data can be characterized in the contour data and further characterized in the slope model.

[0024] In a possible implementation manner, performing image detection on the image data to identify risk sources includes: Identifying abnormal areas on the slope surface of the image data through edge detection; the abnormal areas are areas where the difference between the pixel values and the pixel values of the surrounding areas is less than a preset value, and the preset value is negative; Obtaining the rockfall areas within the areas below the slope toe of the image data as the actual rockfall areas; Identifying the risk sources according to the abnormal areas and the actual rockfall areas.

[0025] When the embodiment of the present application is implemented, in actual operation, the inventor found that the area most likely to have a risk source on the slope surface is the area where rockfall has occurred. In one case, after the rockfall, the rock surface is exposed, and its color will be lighter compared to the surrounding vegetation; in another case, the vegetation that grows after the rockfall is newer, and its color will also be lighter compared to the surrounding vegetation. Therefore, in the embodiment of the present application, the inventor can find the abnormal area with a lighter color through edge detection as part of the risk source; it should be understood that in addition to the rockfall area, the areas with lighter colors may also include footpaths, gullies, etc. At this time, manual screening and discrimination can be carried out. However, in addition to the abnormal areas obtained by image recognition, there may still be risk sources that have not been identified. Therefore, it is necessary to further identify the actual rockfall area first, and then further find the risk sources that have not been identified by image recognition through the actual rockfall area, thereby improving the accuracy of recognition.

[0026] In one possible implementation manner, identifying the risk source according to the abnormal area and the actual rockfall area includes: Regarding the abnormal area as the first risk source, and calculating the rockfall area generated by the first risk source as the first rockfall area; Regarding the part of the actual rockfall area that does not overlap with the first rockfall area as the second rockfall area; Performing rockfall inversion according to the second rockfall area to generate a corresponding second risk source; Regarding the first risk source and the second risk source as the risk source.

[0027] When the embodiment of the present application is implemented, a specific risk source identification scheme is provided. Among them, the abnormal area identified by image recognition can be used as the first risk source. By calculating the rockfall of the first risk source, the first rockfall area can be generated. Its calculation method can simulate different types of rockfalls through kinetic energy, such as using rockfall software for simulation. At this time, the first rockfall area calculated may be different from the actual rockfall area. The different part is the rockfall generated by the risk source that has not been identified. At this time, this part of the area is regarded as the second rockfall area, and rockfall inversion is performed to generate the second risk source. In this way, the risk sources missed in the image recognition process can be well found.

[0028] In one possible implementation manner, performing rockfall inversion according to the second rockfall area to generate a corresponding second risk source includes: Obtaining at least two of the first rockfall areas closest to the second rockfall area as the matching rockfall areas matching the second rockfall area; Obtain the central point coordinates of the second rockfall area in the image data as the second central point coordinates, and obtain the central point coordinates of the corresponding matching rockfall area of the second rockfall area in the image data as the first central point coordinates; Calculate the horizontal coordinate gradient of the second central point coordinates and all the first central point coordinates, and calculate the vertical coordinate gradient of the second central point coordinates and all the first central point coordinates; Interpolate the horizontal coordinates of the first risk source corresponding to the matching rockfall area according to the horizontal coordinate gradient to obtain the horizontal coordinates of the second risk source, and interpolate the vertical coordinates of the first risk source corresponding to the matching rockfall area according to the vertical coordinate gradient to obtain the vertical coordinates of the second risk source; Determine the position of the second risk source according to the horizontal coordinates of the second risk source and the vertical coordinates of the second risk source.

[0029] When implementing the embodiments of the present application, please refer to Figure 2 , which shows a schematic diagram of the interpolation generation of the second risk source. Among them, the second risk source corresponding to the second rockfall area is obtained by interpolating the first risk source. The matching rockfall area is at least two first rockfall areas that are closest to the position of the second rockfall area. The closer the position is, the closer the terrain corresponding to the rockfall is. In the embodiments of the present application, a horizontal gradient and a vertical gradient can be formed by the second central point coordinates and the first central point coordinates; among them, the horizontal gradient can characterize the horizontal position of the second risk source, and the vertical gradient can characterize the vertical position of the second risk source. It should be understood that in the image data, the vertical direction generally corresponds to the slope direction, and for the rockfall area, its vertical direction generally represents the kinetic energy of the rockfall, that is, it represents the vertical position of the risk source on the slope, and the horizontal direction represents the approximate horizontal position of the rockfall starting point, and thus represents the horizontal position of the risk source on the slope; by interpolating the horizontal position and the vertical position, the position of the corresponding second risk source can be obtained.

[0030] In a possible implementation manner, calculate the expected risk of each risk source according to the position of the risk source on the slope model, and design the protection device of the target slope according to the expected risk.

[0031] Calculate the rockfall trajectory of the risk source as the expected risk of the risk source; Design the protection device of the target slope according to the rockfall trajectory.

[0032] When implementing the embodiments of the present application, after obtaining the corresponding rockfall trajectory of the risk source, corresponding protection measures can be designed for the rockfall trajectory, such as strengthening the risk source itself or protecting the rockfall by active / passive protection nets.

[0033] Based on the same inventive concept, an embodiment of the present application further provides a protection device design system based on BIM technology, including: An acquisition unit, configured to photograph and scan a target slope through a drone to obtain contour data of the target slope and image data corresponding to the contour data; A modeling unit, configured to perform BIM modeling on the target slope according to the contour data to form a slope model; A mapping unit, configured to obtain risk sources of the target slope according to the image data and map the risk sources to the slope model; A design unit, configured to calculate the expected risk of each risk source according to the position of the risk source on the slope model, and design a protection device for the target slope according to the expected risk.

[0034] In a possible implementation manner, the mapping unit is further configured to: Perform image detection on the image data to identify risk sources; Obtain the position information of the risk source in the image data, and mark the risk source in the corresponding contour data through the position information; Map the risk sources marked in the contour data to the slope model.

[0035] In a possible implementation manner, the mapping unit is further configured to: Identify an abnormal area on the slope surface of the image data through edge detection; the abnormal area is an area where the difference between the pixel value and the pixel values of the surrounding area is less than a preset value, and the preset value is negative; Obtain the rockfall area within the area below the slope toe of the image data as the actual rockfall area; Identify the risk sources according to the abnormal area and the actual rockfall area.

[0036] In a possible implementation manner, the mapping unit is further configured to: Take the abnormal area as the first risk source, and calculate the rockfall area generated by the first risk source as the first rockfall area; Take the part of the actual rockfall area that does not overlap with the first rockfall area as the second rockfall area; Perform rockfall inversion according to the second rockfall area to generate a corresponding second risk source; Take the first risk source and the second risk source as the risk sources.

[0037] Those of ordinary skill in the art will appreciate that the units and algorithm steps of the examples described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, computer software, or a combination of the two. To clearly illustrate the interchangeability of hardware and software, the composition and steps of the examples have been generally described in terms of function in the above description. Whether these functions are executed in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods for each specific application to implement the described functions, but such implementation should not be considered to exceed the scope of the present invention.

[0038] In several embodiments provided in the present application, it should be understood that the disclosed apparatus and method can be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative. For example, the division of the units is only a logical function division, and there may be other division methods in actual implementation. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. In addition, the displayed or discussed couplings or direct couplings or communication connections to each other can be indirect couplings or communication connections through some interfaces, devices or units, and can also be electrical, mechanical or other forms of connection.

[0039] The units described as separate components may or may not be physically separated. Obviously, those of ordinary skill in the art will appreciate that the units and algorithm steps of the examples described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, computer software, or a combination of the two. To clearly illustrate the interchangeability of hardware and software, the composition and steps of the examples have been generally described in terms of function in the above description. Whether these functions are executed in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods for each specific application to implement the described functions, but such implementation should not be considered to exceed the scope of the present invention.

[0040] In addition, the functional units in the various embodiments of the present invention can be integrated in a processing unit, or each unit can exist physically separately, or two or more units can be integrated in one unit. The above integrated units can be implemented in the form of hardware or in the form of software functional units.

[0041] When the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on such an understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art, or all or part of the technical solution can be embodied in the form of a software product. The computer software product is stored in a storage medium and includes several instructions for causing a computer device (which may be a personal computer, a server, or a grid device, etc.) to execute all or part of the steps of the methods described in various embodiments of the present invention. The aforementioned storage medium includes: various media such as USB flash drives, mobile hard disks, read-only memories (ROMs), random access memories (RAMs), magnetic disks, or optical discs that can store program codes.

[0042] The specific embodiments described above further elaborate on the purpose, technical solution, and beneficial effects of the present invention. It should be understood that the above description is only the specific embodiments of the present invention and is not used to limit the protection scope of the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A design method of a protection device based on BIM technology, characterized in that Including: Taking pictures and scanning the target slope by a drone to obtain the contour data of the target slope and the image data corresponding to the contour data; Performing BIM modeling on the target slope according to the contour data to form a slope model; Obtaining the risk sources of the target slope according to the image data and mapping the risk sources to the slope model; Calculating the expected risk of each risk source according to the position of the risk source on the slope model and designing a protection device for the target slope according to the expected risk.

2. The design method of the protection device based on BIM technology according to claim 1, characterized in that, Obtaining the risk sources of the target slope according to the image data and mapping the risk sources to the slope model includes: Performing image detection on the image data to identify risk sources; Obtaining the position information of the risk source in the image data and marking the risk source in the corresponding contour data through the position information; Mapping the risk sources marked in the contour data to the slope model.

3. The design method of the protection device based on BIM technology according to claim 1, wherein Performing image detection on the image data to identify risk sources includes: Identifying abnormal areas on the slope surface of the image data through edge detection; the abnormal area is an area where the difference between the pixel value and the pixel values of the surrounding areas is less than a preset value, and the preset value is negative; Obtaining the rockfall area within the area below the slope toe of the image data as the actual rockfall area; Identifying the risk sources according to the abnormal area and the actual rockfall area.

4. The design method of the protection device based on BIM technology according to claim 3, wherein, Identifying the risk sources according to the abnormal area and the actual rockfall area includes: Taking the abnormal area as the first risk source and calculating the rockfall area generated by the first risk source as the first rockfall area; Taking the part of the actual rockfall area that does not overlap with the first rockfall area as the second rockfall area; Performing rockfall inversion according to the second rockfall area to generate a corresponding second risk source; Taking the first risk source and the second risk source as the risk sources.

5. The design method of the protection device based on BIM technology according to claim 4, characterized in that, Performing rockfall inversion according to the second rockfall area to generate a corresponding second risk source includes: Obtaining at least two of the first rockfall areas closest to the second rockfall area as the matching rockfall areas matching the second rockfall area; Obtaining the central point coordinates of the second rockfall area in the image data as the second central point coordinates, and obtaining the central point coordinates of the matching rockfall area corresponding to the second rockfall area in the image data as the first central point coordinates; Calculating the horizontal coordinate gradient between the second central point coordinates and all the first central point coordinates, and calculating the vertical coordinate gradient between the second central point coordinates and all the first central point coordinates; Interpolating the coordinates of the first risk source corresponding to the matching rockfall area according to the horizontal coordinate gradient to obtain the horizontal coordinates of the second risk source, and interpolating the coordinates of the first risk source corresponding to the matching rockfall area according to the vertical coordinate gradient to obtain the vertical coordinates of the second risk source; Determining the position of the second risk source according to the horizontal coordinates of the second risk source and the vertical coordinates of the second risk source.

6. The design method of the protection device based on BIM technology according to claim 1, characterized in that, Calculate the expected risk of each risk source according to the position of the risk source on the slope model, and design the protection device for the target slope according to the expected risk; Calculate the rockfall trajectory of the risk source as the expected risk of the risk source; Design the protection device for the target slope according to the rockfall trajectory.

7. A BIM technology-based protective device design system using the method according to any one of claims 1 to 6, characterized in that, It includes: An acquisition unit configured to obtain the contour data of the target slope and the image data corresponding to the contour data by photographing and scanning the target slope by an unmanned aerial vehicle; A modeling unit configured to perform BIM modeling on the target slope according to the contour data to form a slope model; A mapping unit configured to obtain the risk sources of the target slope according to the image data and map the risk sources to the slope model; A design unit configured to calculate the expected risk of each risk source according to the position of the risk source on the slope model, and design the protection device for the target slope according to the expected risk.

8. The protection device design system based on BIM technology according to claim 7, characterized in that The mapping unit is further configured to: Perform image detection on the image data to identify risk sources; Obtain the position information of the risk source in the image data, and mark the risk source in the corresponding contour data through the position information; Map the risk sources marked in the contour data to the slope model.

9. The protection device design system based on BIM technology according to claim 7, characterized in that The mapping unit is further configured to: Identify the abnormal area on the slope surface of the image data through edge detection; the abnormal area is an area where the difference between the pixel value and the pixel values of the surrounding areas is less than a preset value, and the preset value is negative; Obtain the rockfall area within the area below the slope toe of the image data as the actual rockfall area; Identify the risk sources according to the abnormal area and the actual rockfall area.

10. The protection device design system based on BIM technology according to claim 9, characterized in that, The mapping unit is further configured to: Regard the abnormal area as the first risk source, and calculate the rockfall area generated by the first risk source as the first rockfall area; Regard the part of the actual rockfall area that does not overlap with the first rockfall area as the second rockfall area; Perform rockfall inversion according to the second rockfall area to generate the corresponding second risk source; Regard the first risk source and the second risk source as the risk sources.

Images