Rock mass caving geological disaster investigation and evaluation method, system and equipment

Abstract

The invention discloses a rock mass caving geological disaster investigation and evaluation method, system and equipment. The method comprises the following steps: extracting a parent pattern spot and a dangerous rock mass pattern spot in a remote sensing image of an investigation area; dividing a high danger area and a potential danger area; extracting a first buffer pattern spot of the potential danger area; a convex hull is created, and a rock mass caving danger area is generated; after earth surface deformation occurs, obtaining a new investigation area remote sensing image, and extracting earth surface deformation area pattern spots; obtaining a second buffer pattern spot; and creating a new convex hull, and generating a new rock mass caving danger area. According to the scheme, before ground disasters such as landslide and flood occur, the rock mass caving danger area is obtained and divided on the remote sensing image in a mode of combining indoor analysis, field surveying and mapping and survey; after landslide, flood and other ground disasters occur and the local surface changes, a new rock mass caving danger area can be rapidly obtained and divided based on a new remote sensing image in combination with the modes of superposition gland analysis and the like.

Description

Technical Field

[0001] The present invention relates to the technical field of geological disaster investigation and assessment, and in particular to a method, system and equipment for investigation and assessment of geological disasters caused by rock collapse. Background Art

[0002] Rockfall geological disasters usually occur in areas with broken terrain such as steep slopes and cliffs. They manifest as the rock falling off from the parent body under the action of gravity, and rolling along the surface after contacting the surface (the foot of the parent body) until it stops rolling after encountering buffer terrain features such as rivers, trenches, gentle terrain or interceptors (such as rock retaining dams). Rollable stones are formed after the rockfall, and the main monomers are heavy and easy to roll, so they are easy to move to a position far away from the parent body, causing greater harm.

[0003] At present, many dangerous areas after rock collapse overlap with human activity areas, so appropriate prevention and control measures need to be taken to avoid loss of life and property when disasters occur. Specifically, for the prevention and control of geological disasters of rock collapse, the stability of the rock mass and the level of disaster susceptibility are determined through preliminary investigation and evaluation, and combined with field surveys, the dangerous areas and safe areas when disasters occur are delineated according to the rolling estimated areas after rock collapse. For rock masses with poor stability and high collapse risks, the threat of disasters can be controlled by cutting in advance or building rock dams (ditches). For areas with relatively stable rock masses and low disaster susceptibility levels, a monitoring-based approach is adopted to try to avoid people and materials from entering dangerous areas.

[0004] However, after local geological disasters such as landslides caused by rainfall, the local surface topography has changed, and the safe areas determined by the preliminary survey may partially change into dangerous areas. If people and materials enter the dangerous areas transformed from safe areas, the risk of loss is greater. If the on-site survey method is used to redefine the dangerous areas and safe areas, it will not only take a long time, but also pose certain safety risks to the surveyors. Summary of the invention

[0005] The purpose of the present invention is to provide a method, system and equipment for surveying and evaluating geological disasters of rock mass collapse, which can divide dangerous areas at a relatively fast speed after the local surface topography changes, thereby reducing the risk of losses.

[0006] According to a first aspect of the present invention, a method for investigating and assessing geological hazards of rock mass collapse is provided, which comprises: S1. Obtain the spatial model of dangerous rock mass in the survey area, remote sensing images of the survey area, and terrain elevation data of the survey area; S2, extracting the parent body spots and dangerous rock body spots from the remote sensing images of the survey area; S3, setting the maximum rolling diameter of the collapsed rock mass; S4. Divide the high-risk areas and potential risk areas in the remote sensing image of the investigation area; S5. Extract the first buffer patches of the potential risk areas. With the center point of the dangerous rock mass patch as the center, set multiple radial analysis lines at equal angles. Each radial analysis line located in the potential risk area passes through at least two first buffer patches; S6. Extract the first buffer patch closest to the center point of the dangerous rock mass patch on each radial analysis line located in the potential risk area, create a convex hull containing the dangerous rock mass patch, and generate a rockfall danger area by combining the convex hull with the high-risk area; S7. After the surface deformation occurs, obtain a new remote sensing image of the investigation area and extract the surface deformation area patches; S8. Overlay the surface deformation area patches with the first buffer patches, and obtain the second buffer patches from the first buffer patches based on the overlay result; S9. Extract the second buffer patch closest to the center point of the dangerous rock mass patch on each radial analysis line, create a new convex hull containing the dangerous rock mass patch, and generate a new rockfall danger area by combining the new convex hull with the high-risk area.

[0007] According to the rockfall geological disaster investigation and assessment method described above, in S2, setting the maximum rolling diameter of the fallen rock blocks includes: Vertically project the spatial model of the dangerous rock mass onto the horizontal plane to form a projected patch, measure the diameter of the minimum circumscribed rectangle of the projected patch, and set the maximum rolling diameter W1 of the fallen rock blocks = α × the diameter of the minimum circumscribed rectangle; 1 ≤ α ≤ 2.

[0008] According to the rockfall geological disaster investigation and assessment method described above, in S4, dividing the high-risk areas and potential risk areas in the remote sensing image of the investigation area includes: Judge whether the contour line of the parent patch extends to the two side boundaries of the remote sensing image of the investigation area; if so, divide the remote sensing image of the investigation area with the contour line of the parent patch, and retain the image part containing the dangerous rock mass patch as the analysis area; if not, draw a line connecting the center point of the dangerous rock mass patch and the parent patch, draw a perpendicular line to the connecting line, divide the remote sensing image of the investigation area with the perpendicular line, retain the image part containing the dangerous rock mass patch and delete the parent patch as the analysis area; and the distance between the perpendicular line and the center point of the dangerous rock mass patch is the diameter of the minimum circumscribed rectangle of the projected patch; Measure the height of the spatial model, draw a circle with the center point of the dangerous rock mass patch as the center and the height of the spatial model as the radius. The area covered by the circle in the analysis area is recorded as the high-risk area; The area in the analysis area after excluding the high-risk area is recorded as the potential risk area.

[0009] According to the rockfall geological disaster investigation and assessment method described above, in S6, the first buffer patches closest to the center point of the dangerous rock mass patch on each radial analysis line located in the potential danger area are extracted, a convex hull containing the dangerous rock mass patch is created, and based on the combination of the convex hull and the high-risk area, the rockfall danger area is generated, including: Extract the radial analysis lines located in the potential danger area; Select the outermost first radial analysis line, and find the first buffer patch closest to the center point of the dangerous rock mass patch along this radial analysis line; Select adjacent radial analysis lines, and check whether the radial analysis line passes through the first buffer patch that has been found; if so, select the next adjacent radial analysis line for checking; if not, find the first buffer patch closest to the center point of the dangerous rock mass patch along this radial analysis line; repeat this step to traverse all the radial analysis lines located in the potential danger area to extract the first buffer patches closest to the center point of the dangerous rock mass patch on each radial analysis line; Create a convex hull, and all the extracted first buffer patches and the dangerous rock mass patch are located inside the convex hull; Extract the area of the convex hull that overlaps with the analysis area, and combine this area with the high-risk area to generate the rockfall danger area.

[0010] According to the rockfall geological disaster investigation and assessment method described above, in S8, the surface deformation area patches are superimposed on the first buffer patches, and the second buffer patches are obtained from the first buffer patches based on the superimposition result, including: Superimpose and cover the surface deformation area patches and the first buffer patches; Traverse each first buffer patch, and extract the first buffer patches that have an overlay with the surface deformation area patches; Analyze the proportion of the covered area of each first buffer patch; if the proportion exceeds the first threshold, delete the first buffer patch; if the proportion does not exceed the first threshold, retain the uncovered part of the first buffer patch as an intermediate patch; The intermediate patches and the first buffer patches that do not have an overlay with the surface deformation area patches constitute the second buffer patches.

[0011] According to the rockfall geological disaster investigation and assessment method described above, 70% ≤ the first threshold ≤ 80%.

[0012] According to the rockfall geological disaster investigation and assessment method described above, in S7, the surface deformation area patches include landslide area patches and / or flood scouring area patches.

[0013] According to the second aspect of the present invention, a system is provided, which includes a processor and a memory, and the memory stores multiple instructions; the processor loads the instructions from the memory to execute the rockfall geological disaster investigation and assessment method.

[0014] According to the third aspect of the present invention, there is provided an electronic device, including a memory, a processor, and a computer program stored on the memory, wherein the processor executes the computer program to implement the steps of the geological disaster investigation and assessment method for rock mass collapse.

[0015] Beneficial effects: Through the above solution, before geological disasters such as landslides and floods occur, by combining in-office analysis with field mapping and reconnaissance, a rock mass collapse danger zone can be obtained on remote sensing images; after geological disasters such as landslides and floods occur, resulting in local changes on the ground surface, based on the new remote sensing images and combined with methods such as overlay analysis, a new rock mass collapse danger zone can be quickly obtained and divided, so as to timely set up monitoring and warnings to avoid losses caused by personnel and materials entering the new rock mass collapse danger zone.

[0016] Additional aspects and advantages of the present invention will be given in part in the following description, become apparent in part from the following description, or be understood through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The present invention will be further described below in conjunction with the drawings and embodiments; Figure 1 is a flowchart of the method of the present invention; Figure 2 is a schematic diagram of extracting the parent patches and dangerous rock patches from the remote sensing images of the investigation area; Figure 3 is a schematic diagram of dividing the high-risk area and potential risk area in the remote sensing images of the investigation area; Figure 4 is a schematic diagram of setting the radial analysis lines and extracting the first buffer patches; Figure 5 is a schematic diagram of generating the rock mass collapse danger zone. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0018] This part will describe in detail the specific embodiments of the present invention. The preferred embodiments of the present invention are shown in the drawings. The role of the drawings is to supplement the description in the text part of the specification, enabling people to intuitively and vividly understand each technical feature and the overall technical solution of the present invention, but it cannot be understood as a limitation on the protection scope of the present invention.

[0019] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by terms such as up, down, front, back, left, right, etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0020] In the description of the present invention, "greater than", "less than", "exceeding", etc. are understood not to include the number itself, while "above", "below", "within", etc. are understood to include the number itself. If the first and second are described, it is only for the purpose of distinguishing technical features and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features or implicitly specifying the sequence of the indicated technical features.

[0021] In the description of the present invention, unless otherwise clearly defined, terms such as "set", "install", "connect", etc. should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above terms in the present invention in combination with the specific content of the technical solution.

[0022] Refer to Figures 1-5 , the method for investigating and evaluating geological disasters of rock mass collapse in the embodiment of the present invention includes: S1. Obtain the spatial model of dangerous rock masses in the investigation area, remote sensing images of the investigation area, and topographic elevation data of the investigation area; S2. Extract the mother body patches and dangerous rock mass patches from the remote sensing images of the investigation area; S3. Set the maximum rolling diameter of the boulders of the collapsed rock mass; S4. Divide the high-risk area and potential risk area in the remote sensing images of the investigation area; S5. Extract the first buffer patches of the potential risk area, set multiple radial analysis lines at equal angles with the center point of the dangerous rock mass patch as the center, and each radial analysis line located in the potential risk area passes through at least two first buffer patches; S6. Extract the first buffer patch closest to the center point of the dangerous rock mass patch on each radial analysis line located in the potential risk area, create a convex hull containing the dangerous rock mass patch, and generate a rock mass collapse risk area based on the combination of the convex hull and the high-risk area; S7. After the occurrence of surface deformation, obtain new remote sensing images of the investigation area and extract the patches of the surface deformation area; S8. Overlay the patches of the surface deformation area with the first buffer patches, and obtain the second buffer patches from the first buffer patches based on the overlay result; S9. Extract the second buffer patch closest to the center point of the dangerous rock mass patch on each radial analysis line, create a new convex hull containing the dangerous rock mass patch, and generate a new rock mass collapse risk area based on the combination of the new convex hull and the high-risk area.

[0023] Specifically, in step S1, based on the unmanned aerial vehicle carrying measurement equipment flying in the investigation area, spatial data, image data, etc. of the mother body (mountains and steep slopes with high stability, basically no collapse risk) and dangerous rock masses (rock masses outside the mother body with collapse risk) are obtained, and the spatial model of the dangerous rock masses is extracted therefrom. The remote sensing images of the investigation area and the topographic elevation data of the investigation area can be directly obtained from relevant units to reduce their own workload.

[0024] In step S2, first, the parent patches and the dangerous rock patches are directly extracted from the remote sensing image, and then the boundaries of the patches are corrected by combining the data measured in the on-site reconnaissance survey to accurately obtain the dividing line and the outline of the parent patches and the dangerous rock patches.

[0025] In step S3, the maximum rolling diameter of the fallen rock blocks is set, which specifically includes: vertically projecting the spatial model of the dangerous rock onto the horizontal plane to form a projected patch, measuring the diameter of the minimum circumscribed rectangle of the projected patch, and setting the maximum rolling diameter W1 of the fallen rock blocks = α × the diameter of the minimum circumscribed rectangle; 1 ≤ α ≤ 2. α is a coefficient, and in actual operation, α takes a fixed value within this range, and then the analysis is carried out.

[0026] Some dangerous rocks have a small width shown on the patch, but actually there is a situation where the bottom bulges towards the parent body. In this case, the size of the rock blocks generated after collapse may far exceed the diameter of the minimum circumscribed rectangle of the dangerous rock patch. Therefore, by measuring the projected patch to set the maximum rolling diameter of the fallen rock blocks, its reliability is higher.

[0027] After the rock mass collapses, it will break into multiple rock blocks, and the rock blocks roll along the ground surface. The maximum height of the rock blocks relative to the ground surface during rolling corresponds to the maximum rolling diameter. The terrain and features corresponding to the first buffer patch can obstruct the rock blocks, and the maximum rolling diameter can be used as a reference for the size of the first buffer patch.

[0028] In step S4, the high-risk area and the potential risk area in the remote sensing image of the investigation area are divided, which specifically includes: First, it is judged whether the outline of the parent patch extends to the two side boundaries of the remote sensing image of the investigation area; if so, the remote sensing image of the investigation area is segmented by the outline of the parent patch. At this time, the remote sensing image of the investigation area can be segmented into three parts by the outline of the parent patch (namely the parent patch itself, the image containing the dangerous rock patch, and the image without the parent patch and the dangerous rock patch), and the image part containing the dangerous rock patch is retained as the analysis area; if not, first draw a line connecting the center point of the dangerous rock patch and the center point of the parent patch, and then draw a perpendicular line to this line. The perpendicular line extends to the boundary of the remote sensing image of the investigation area, and the remote sensing image of the investigation area is segmented by this perpendicular line (the remote sensing image of the investigation area is segmented into two parts: the image containing the dangerous rock patch, and the image without the dangerous rock patch), and the image part containing the dangerous rock patch is retained. This part of the image contains part of the parent patch, and after deleting the parent patch from this part of the image, it is used as the analysis area; and the distance between the perpendicular line and the center point of the dangerous rock patch is the diameter of the minimum circumscribed rectangle of the projected patch; Measure the height of the spatial model, draw a circle with the center point of the dangerous rock patch as the center and the height of the spatial model as the radius. The area in the analysis area that is covered by the circle (that is, the overlapping part of the analysis area and the circle) is recorded as the high-risk area; The area after excluding the high-risk area in the analysis area is denoted as the potential risk area.

[0029] In step S5, the first buffer patches are extracted in a combination of indoor and outdoor work. Indoors, combined with terrain elevation data, patches of topographic features such as roads, rivers, ditches, and protrusions (such as hillocks and ridges) that can hinder the rolling of rocks can be directly extracted as the first buffer patches. Among them, the width of the road is usually not less than W1, the width of the river and ditch is usually not less than 0.5×W1, and the height of the protrusion is usually not less than 0.75×W1. For some other topographic features that can hinder the rolling of rocks (such as paddy fields, ponds, flatlands, woodlands, gentle drylands, etc.), they can be accurately obtained through on-site surveys.

[0030] The topographic features corresponding to the first buffer patches effectively hinder the rolling stones formed after the collapse of the dangerous rock mass, preventing the stones from continuing to roll downward. Based on this principle, the first buffer patches are extracted within the potential risk area.

[0031] After extracting the first buffer patches in the potential risk area, taking the center point of the dangerous rock mass patch as the center, multiple radial analysis lines are set at equal angles. Each radial analysis line located in the potential risk area passes through at least two first buffer patches. If it is found that a radial analysis line passes through only one first buffer patch, additional first buffer patches are extracted on the remote sensing image.

[0032] In step S6, the first buffer patch closest to the center point of the dangerous rock mass patch on each radial analysis line located in the potential risk area is extracted, a convex hull containing the dangerous rock mass patch is created, and based on the combination of the convex hull and the high-risk area, a dangerous area for rock mass collapse is generated, which specifically includes: Extract the radial analysis lines located in the potential risk area; Select the outermost first radial analysis line, and find a first buffer patch closest to the center point of the dangerous rock mass patch along this radial analysis line; Select the second radial analysis line adjacent to the first radial analysis line, and check whether this radial analysis line passes through the first buffer patch that has been found; if so, select the next adjacent radial analysis line for checking; if not, find a first buffer patch closest to the center point of the dangerous rock mass patch along this radial analysis line; repeat this step to traverse all the radial analysis lines located in the potential risk area, and extract the first buffer patches closest to the center point of the dangerous rock mass patch on each radial analysis line located in the potential risk area; Create a convex hull (i.e., the minimum convex polygon envelope) based on the dangerous rock mass patch and the selected first buffer patches, and all the extracted first buffer patches and the dangerous rock mass patch are included in this convex hull.

[0033] The area in the convex hull area that overlaps with the analysis area is extracted and merged with the high-risk area to generate a rock collapse hazard area. Appropriate monitoring is required in this area to avoid personnel and materials from entering the area as much as possible.

[0034] In step S7, it mainly refers to the surface changes caused by landslides and floods. The boundaries of such surface changes are relatively obvious, and the surface changes in other areas are not significant, which is easier to analyze. After the surface deformation occurs, obtain the new remote sensing image of the survey area and extract the surface deformation area patches (i.e., landslide patches and flood damage area patches).

[0035] In step S8, the surface deformation area patch is superimposed on the first buffer patch, and the second buffer patch is obtained from the first buffer patch based on the superposition result, which specifically includes: The ground deformation area map is placed on top and the first buffer map is placed on the bottom to be superimposed and covered; Traverse each first buffer patch and extract the first buffer patch that overlaps with the patch of the surface deformation area; Analyze the proportion of the covered area of ​​each extracted first buffer spot; if the proportion exceeds the first threshold, delete the first buffer spot; if the proportion does not exceed the first threshold, retain the part of the first buffer spot that is not covered as the intermediate spot; The middle map patch and the first buffer map patch that is not overlapped with the map patch in the surface deformation area constitute the second buffer map patch.

[0036] The value range of the first threshold is: 70%≤first threshold≤80%. In actual operation, the first threshold is set to a fixed value within the value range for analysis.

[0037] In step S9, the specific operation is the same as step S6, and will not be described again.

[0038] It should be noted that the scheme of the present invention is more applicable to local surface changes caused by landslides and floods, and the new danger zone can be redefined based on this, with higher demarcation speed and accuracy. For large-scale surface changes caused by earthquakes, the applicability is lower because there are more map patches in the surface deformation area to be analyzed and the geological state has changed significantly.

[0039] The present invention also provides a system, which includes a processor and a memory, wherein the memory stores a plurality of instructions; the processor loads instructions from the memory to execute the rock mass collapse geological disaster investigation and assessment method.

[0040] The present invention also provides an electronic device, including a memory, a processor and a computer program stored in the memory, wherein the processor executes the computer program to implement the steps of the rock collapse geological disaster investigation and assessment method.

[0041] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments, and various changes can be made without departing from the spirit of the present invention within the scope of knowledge possessed by those of ordinary skill in the art.

Claims

1. A method for investigation and assessment of geological hazards of rock collapse, characterized in that: include: S1. Obtain the spatial model of dangerous rock mass in the survey area, remote sensing images of the survey area, and terrain elevation data of the survey area; S2, extracting the parent body spots and dangerous rock body spots from the remote sensing images of the survey area; S3, setting the maximum rolling diameter of the collapsed rock mass; S4. Identify high-risk areas and potential risk areas in the remote sensing images of the survey area; S5, extracting the first buffer map of the potential danger zone, taking the center point of the dangerous rock mass map as the circle, setting a plurality of radial analysis lines at equal angles, and each radial analysis line located in the potential danger zone passes through at least two first buffer map spots; S6, extracting the first buffer patch closest to the center point of the dangerous rock patch on each radial analysis line located in the potential danger zone, creating a convex hull containing the dangerous rock patch, and merging the convex hull with the high-risk area to generate a rock collapse danger zone; S7. After the surface deformation occurs, obtain new remote sensing images of the survey area and extract the map spots of the surface deformation area; S8, superimposing the surface deformation area map with the first buffer map, and obtaining a second buffer map from the first buffer map based on the superposition result; S9, extracting the second buffer patch closest to the center point of the dangerous rock patch on each radial analysis line, creating a new convex hull containing the dangerous rock patch, merging the new convex hull with the high-risk area, and generating a new rock collapse hazard area.

2. The rock collapse geological disaster investigation and assessment method according to claim 1, characterized in that: In S2, setting the maximum rolling diameter of the rockfall includes: The spatial model of the dangerous rock mass is vertically projected onto the horizontal plane to form a projection pattern. The minimum circumscribed rectangle diameter of the projection pattern is measured, and the maximum rolling diameter of the collapsed rocks is set to W1 = α × the minimum circumscribed rectangle diameter; 1 ≤ α ≤ 2.

3. The method for investigating and assessing rockfall geological disasters according to claim 2, characterized in that: In S4, the high-risk areas and potential risk areas in the remote sensing images of the survey area are divided into: Determine whether the outline of the parent patch extends to the boundaries of both sides of the remote sensing image of the survey area; if so, divide the remote sensing image of the survey area with the outline of the parent patch, and retain the image part containing the dangerous rock patch as the analysis area; if not, draw a line connecting the dangerous rock patch and the center point of the parent patch, draw a perpendicular line to the line, divide the remote sensing image of the survey area with the perpendicular line, retain the image part containing the dangerous rock patch and delete the parent patch as the analysis area; and the distance between the perpendicular line and the center point of the dangerous rock patch is the minimum circumscribed rectangle diameter of the projected patch; Measure the height of the spatial model, draw a circle with the center point of the dangerous rock mass patch as the center and the height of the spatial model as the radius, and the area covered by the circle in the analysis area is recorded as a high-risk area; The area after excluding the high-risk area in the analysis area is recorded as the potential risk area.

4. The method for investigating and assessing rockfall geological disasters according to claim 3, characterized in that: In S6, the first buffer patch closest to the center point of the dangerous rock patch on each radial analysis line located in the potential danger zone is extracted, and a convex hull containing the dangerous rock patch is created. The convex hull is merged with the high-risk area to generate a rock collapse danger zone including: Extract radial analysis lines located in potential danger areas; Select the first radial analysis line arranged on the outermost side, and find the first buffer spot closest to the center point of the dangerous rock mass spot along the radial analysis line; Select an adjacent radial analysis line to check whether the radial analysis line passes through the first buffer spot that has been found; if so, select the next adjacent radial analysis line for checking; if not, find the first buffer spot closest to the center point of the dangerous rock mass spot along the radial analysis line; repeat this step, traverse all radial analysis lines located in the potential danger zone, and extract the first buffer spot closest to the center point of the dangerous rock mass spot on each radial analysis line; Create a convex hull, and all the first buffer spots and dangerous rock mass spots that have been extracted are located in the convex hull; The area in the convex hull that overlaps with the analysis area is extracted and merged with the high-risk area to generate the rock collapse hazard area.

5. The rock mass collapse geological disaster investigation and assessment method according to claim 1, characterized in that: In S8, superimposing the surface deformation area map with the first buffer map, and obtaining the second buffer map from the first buffer map based on the superposition result includes: Superimpose and cover the surface deformation area map and the first buffer map; Traverse each first buffer patch and extract the first buffer patch that overlaps with the patch of the surface deformation area; Analyze the proportion of the covered area of ​​each first buffer spot; if the proportion exceeds the first threshold, delete the first buffer spot; if the proportion does not exceed the first threshold, retain the part of the first buffer spot that is not covered as the intermediate spot; The middle map patch and the first buffer map patch that is not overlapped with the map patch in the surface deformation area constitute the second buffer map patch.

6. The method for investigating and assessing geological disasters of rock collapse according to claim 1, characterized in that: The value range of the first threshold is: 70%≤first threshold≤80%.

7. The method for investigating and assessing rockfall geological disasters according to claim 1, characterized in that: In S7, the surface deformation area map patches include landslide area map patches and / or flood destroyed area map patches.

8. A system, characterized in that It comprises a processor and a memory, wherein the memory stores a plurality of instructions; the processor loads instructions from the memory to execute the rock mass collapse geological disaster investigation and assessment method as described in any one of claims 1 to 7.

9. An electronic device comprising a memory, a processor and a computer program stored in the memory, characterized in that: The processor executes the computer program to implement the steps of the rock collapse geological disaster investigation and assessment method according to any one of claims 1 to 7.

Images