Cesium-based earth volume dynamic measuring and calculating system and method in mine ecological restoration

Abstract

The invention relates to the technical field of mine ecological restoration intelligent measurement and calculation, and provides a Cesium-based earth volume dynamic measurement and calculation system and method in mine ecological restoration, and the method comprises the following steps: collecting a three-dimensional live-action model of a historical remaining mine, and converting the three-dimensional live-action model into a 3D Tiles format supported by Cesium through a format conversion module; a model loading module is used for loading three-dimensional models in different periods in Cesium, and an ecological restoration earthwork volume change calculation area is drawn in an area drawing module; the parameter input module is used for inputting earthwork volume change to calculate precision, and the earthwork calculation module is used for sampling and acquiring three-dimensional model coordinate point data in a calculation area according to the precision; and the drawing output module finally outputs the total amount of earthwork volume change and draws a three-dimensional histogram of earthwork volume change distribution in the calculation area. According to the invention, the efficiency and safety of earth volume change measurement and calculation in ecological restoration are effectively improved, and an automatic solution and a digital display scheme are also provided.

Description

Technical Field

[0001] The present invention relates to the technical field of intelligent measurement of mine ecological restoration, and in particular to a Cesium-based system and method for dynamic measurement of earthwork volume in mine ecological restoration. Background Art

[0002] As one of the important contents of mine ecological restoration, topography and landform remodeling mainly include land leveling, mine pit backfilling, and slag recycling. The change of mine earthwork volume is of great significance to the progress of mine ecological restoration. Timely grasping the total amount and distribution of mine earthwork volume changes can help formulate subsequent restoration plans and evaluate slope stability. In the current traditional technology, the change of mine earthwork volume is usually determined by manual measurement and calculation. The large-scale mine earthwork volume measurement is labor-intensive, low in efficiency, and insufficient in automation. When measuring in areas prone to landslide fissures such as mine boundaries and steep slopes, the degree of danger is high. There is an urgent need for efficient and safe earthwork volume measurement methods to replace manual measurement.

[0003] In the prior art, Chinese patent CN116012613B (published on April 25, 2023) discloses a method and system for measuring the change in earthwork volume of an open-pit mine based on laser point cloud, which involves the field of mineral mining technology, including: three-dimensional laser radar scanning data acquisition, point cloud data preprocessing, three-dimensional distance transformation map acquisition, triangulation network construction and earthwork volume calculation. After obtaining the target open-pit mine laser point cloud data, preprocessing such as registration, thinning, and denoising is performed. The point cloud collection of the changed area is calculated according to the three-dimensional distance transformation map, and the triangulation network of the boundary of the changed area is constructed using the point-by-point insertion method. Each triangle is traversed to calculate the earthwork volume corresponding to the changed area.

[0004] The solution involved in the above patent relies on three-dimensional lidar scanning technology and complex point cloud processing algorithms, which require relatively advanced hardware facilities and software support. It may be difficult to implement in some areas with limited resources or insufficient technical conditions. The introduction of high-end lidar equipment and supporting data processing platforms will significantly increase the initial investment cost of the project, and the subsequent maintenance costs will be high.

[0005] Chinese patent CN111783192A (publication date October 16, 2020) discloses a method for calculating earthwork for site leveling in complex terrain based on an oblique photography real-life model. This method conducts field surveys on site and sets flight data; selects a coordinate system and phase control points, uses drone aerial photography, and extracts aerial photos and POS data; imports the processing platform to generate an oblique photography model; verifies the oblique photography model through phase control points to achieve precise positioning of the coordinate system and elevation; filters the interference objects in the oblique photography model to obtain a real-life model of the site leveling site; imports the real-life model into a viewing application tool, and divides it into excavation area and fill area according to the actual site leveling elevation; calculates the earthwork volume of the excavation and fill areas based on the site leveling elevation, and performs self-balancing utilization of the excavation and fill earthwork.

[0006] The generation of high-quality oblique photography models in the above-mentioned patent requires a large amount of computing resources and has certain requirements for hardware configuration. The computing algorithm used in the application is outdated. In addition, compatibility issues between different software may also increase the processing difficulty. The utilization efficiency of the real-life three-dimensional model is low, and the earthwork volume comparison cannot be viewed intuitively. Summary of the invention

[0007] To solve the above problems, this application uses the current drone oblique photogrammetry technology to quickly and accurately obtain a large range of historical mining image data, and produce a real-life three-dimensional model. Combined with the Cesium engine, it can not only intuitively display the ecological restoration of the mine, but also provide a data basis for earthwork volume calculation, and automatically calculate the changes in earthwork volume.

[0008] To achieve the above purpose, this application uses the powerful functions of the Cesium engine and the characteristics of the real-scene three-dimensional model to design a Cesium-based system and method for dynamic measurement of earthwork volume in mine ecological restoration. The system includes: a format conversion module, a model loading module, a region drawing module, a parameter input module, an earthwork calculation module, and a mapping output module; The format conversion module is used to convert the collected three-dimensional real scene model of the historical mine into the 3DTiles format supported by Cesium; The model loading module is used to load the historical mine three-dimensional real scene models in 3DTiles format from different periods; The area drawing module is used to draw the ecological restoration earthwork volume change calculation area; The parameter input module is used to input the calculation accuracy of earthwork volume change; The earthwork calculation module encapsulates the earthwork volume calculation algorithm, which is used to calculate the corresponding earthwork volume change total amount and earthwork volume change distribution data; The mapping output module is used to output the total amount of earthwork volume change and to draw a three-dimensional bar chart showing the distribution of earthwork volume change.

[0009] Furthermore, the system also includes a model comparison module; The model comparison module is used to compare and display the loaded three-dimensional real-scene models of historical mines left over from different periods; Furthermore, the model comparison module functions include: being able to translate, rotate, and zoom the loaded three-dimensional real-life models of historical mines from different periods; The model comparison module includes left and right columns, which respectively display three-dimensional real-life models of historical mines left over from different periods; Furthermore, the calculation method of the earthwork volume dynamic calculation system in mine ecological restoration based on Cesium includes the following steps: Step S1: Regularly collect and produce oblique photography 3D real scene models of historical mines, and use the format conversion module to convert them into the 3DTiles format supported by Cesium; Step S2: Use the model loading module to load the three-dimensional models of historical mines in different periods in Cesium, and input or draw the calculation area of ​​ecological restoration earthwork volume change in the regional drawing module; Step S3: using the parameter input module to input the calculation accuracy of earthwork volume change, and then the earthwork calculation module obtains the coordinate point data on the surface of the three-dimensional model of historical mines left over from different periods in the calculation area according to the accuracy sampling; Step S4: input the acquired coordinate point data into the earthwork volume calculation algorithm to obtain the earthwork volume change data of historical mines in different periods; Step S5: The mapping output module finally outputs the total amount of earthwork volume change and draws a three-dimensional bar chart of the distribution of earthwork volume change in the calculation area.

[0010] Furthermore, the three-dimensional model of the historical mines in different periods in step S2 can be a model of any period, and the change of earthwork volume at different time intervals is calculated; The method for confirming the calculation area of ​​the change in earthwork volume of ecological restoration includes: by inputting the coordinates of the inflection points connected at the beginning and the end, and manually drawing on the model.

[0011] Furthermore, the calculation accuracy of the earthwork volume change in step S3 includes 5 levels, and the sampling intervals include 5m, 4m, 3m, 2m, and 1m, and the corresponding parameters are 1-5. When the set parameter value increases, the corresponding sampling interval decreases.

[0012] Furthermore, the earthwork volume calculation algorithm steps in step S4 include: Step S4.1: Generate a polygonal boundary range according to the calculation area input in step S2; Step S4.2: Determine the sampling interval according to the calculation accuracy of the earthwork volume change input in step S3; Step S4.3: Use the clampToHeightMostDetailed function in Cesium to obtain the coordinate point data within the polygon boundary range of the model at different periods according to the sampling interval; Step S4.4: Generate a Delaunay triangulation network with the coordinate point data obtained at different times, and form irregular triangular prisms with the preset reference surface. Each irregular triangular prism can be divided into regular triangular prisms and irregular tetrahedrons by the vertex with the lowest elevation of the triangular element. The difference between the sum of the volumes of all regular triangular prisms and irregular tetrahedrons at different times is the total change in earthwork volume. When the coordinates of one of the triangular element vertices are set to , , In the case of , point B is the lowest point in elevation, and the corresponding elevation is , then the corresponding irregular triangular prism volume calculation formula is: ; in is the volume of a regular triangular prism, and the calculation formula is: ; ; in is the volume of an irregular tetrahedron, and the calculation formula is: ; ; The difference between the total volume of all irregular triangular prisms in different periods is the total change of earthwork volume. The difference between the volumes of individual irregular triangular prisms in different periods can be used to draw the distribution of earthwork volume change. Step S4.5: Output the total amount of earthwork volume change and the distribution data of earthwork volume change.

[0013] Furthermore, the three-dimensional bar graph of the earthwork volume change distribution in step S5 is drawn using the ECharts plug-in, with the triangular face position as the base and the difference in volume of a single irregular triangular prism corresponding to different periods as the value to represent the distribution.

[0014] Compared with the prior art, the above technical solution has the following beneficial effects: 1. The present invention proposes a dynamic measurement method for earthwork volume in ecological restoration of historical mines based on Cesium. The method uses oblique photogrammetry technology to quickly and accurately collect and produce three-dimensional real-scene models of historical mines. After converting the data into 3DTiles format, the earthwork volume change results are automatically calculated in Cesium according to the calculation area and accuracy, and a three-dimensional bar chart of the total change and the distribution of earthwork volume change is output, which effectively improves the efficiency and safety of earthwork volume change measurement in large-scale ecological restoration of historical mines.

[0015] 2. The present invention combines the method to propose a Cesium-based dynamic measurement system for earthwork volume in ecological restoration of historical mines, which effectively simplifies the tedious process of manually measuring the changes in earthwork volume in ecological restoration of historical mines. It can also combine with three-dimensional real-scene models to intuitively display the ecological restoration situation, providing an automated solution and digital display solution for the dynamic measurement of earthwork volume in ecological restoration of historical mines, and the cost is relatively low.

[0016] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application so that it can be implemented in accordance with the contents of the specification, and to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the following is a detailed description of the preferred embodiments of the present application in conjunction with the accompanying drawings.

[0017] Based on the detailed description of the specific embodiments of the present application in combination with the accompanying drawings below, those skilled in the art will become more aware of the above and other objects, advantages and features of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings required for use in the embodiments or the prior art descriptions are briefly introduced below. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can also be obtained based on these drawings without creative work. In all drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, each element or part is not necessarily drawn according to the actual scale.

[0019] in: Figure 1 is a system architecture diagram of the present invention; Figure 2 It is a flow chart of the calculation method of the present invention; Figure 3 It is a three-dimensional real scene model of the historical mine left over by the present invention (before dragging the columns); Figure 4 It is a three-dimensional real scene model of the historical mine left over by the present invention (after dragging the columns); Figure 5 It is a three-dimensional bar graph of the total amount of earthwork volume change and the distribution of earthwork volume change calculated by the present invention. DETAILED DESCRIPTION

[0020] To make the purpose, technical scheme and advantages of the embodiment of the present application clearer, the technical scheme in the embodiment of the present application will be clearly and completely described below in conjunction with the accompanying drawings in the embodiment of the present application. Obviously, the described embodiment is a part of the embodiment of the present application, rather than all of the embodiments. In the following description, specific details such as specific configuration and components are provided only to help fully understand the embodiments of the present application. Therefore, it should be clear to those skilled in the art that various changes and modifications can be made to the embodiments described herein without departing from the scope and spirit of the present application. In addition, for clarity and brevity, the description of known functions and structures is omitted in the embodiment.

[0021] It should be understood that the references to "one embodiment" or "this embodiment" throughout the specification mean that the specific features, structures, or characteristics associated with the embodiment are included in at least one embodiment of the present application. Therefore, the references to "one embodiment" or "this embodiment" appearing throughout the specification do not necessarily refer to the same embodiment. In addition, these specific features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.

[0022] In addition, the present application may repeat reference numerals and / or letters in different examples. This repetition is for the purpose of simplicity and clarity, and does not in itself indicate the relationship between the various embodiments and / or settings discussed.

[0023] The term "and / or" in this article is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can mean: A exists alone, B exists alone, and A and B exist at the same time. The term " / and" in this article describes another type of association object relationship, indicating that there can be two relationships. For example, A / and B can mean: A exists alone, and A and B exist alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0024] The term "at least one" in this article is merely a description of the association relationship of associated objects, indicating that there may be three relationships. For example, at least one of A and B can mean: A exists alone, A and B exist at the same time, and B exists alone.

[0025] It should also be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusions.

[0026] Example 1

[0027] This example introduces a Cesium-based earthwork volume dynamic measurement system for mine ecological restoration. Please refer to Figure 1 As shown, the system includes a format conversion module, a model loading module, a region drawing module, a parameter input module, an earthwork calculation module, and a mapping output module; The format conversion module is used to convert the collected three-dimensional real scene model of the historical mine into the 3DTiles format supported by Cesium; The model loading module is used to load the historical mine three-dimensional real scene models in 3DTiles format from different periods; The area drawing module is used to draw the ecological restoration earthwork volume change calculation area; The parameter input module is used to input the calculation accuracy of earthwork volume change; The earthwork calculation module encapsulates the earthwork volume calculation algorithm, which is used to calculate the corresponding earthwork volume change total amount and earthwork volume change distribution data; The mapping output module is used to output the total amount of earthwork volume change and to draw a three-dimensional bar chart showing the distribution of earthwork volume change.

[0028] Furthermore, the system also includes a model comparison module; The model comparison module is used to compare and display the loaded three-dimensional real-scene models of historical mines left over from different periods.

[0029] Furthermore, the model comparison module functions include: being able to translate, rotate, and zoom the loaded three-dimensional real-life models of historical mines from different periods; The model comparison module includes left and right columns, which respectively display three-dimensional real-life models of historical mines left over from different periods.

[0030] Technical effect of this embodiment: The Cesium-based dynamic measurement system for earthwork volume in ecological restoration of historical mines proposed by the present invention effectively simplifies the tedious process of manually measuring the changes in earthwork volume, and can also combine with the three-dimensional real-scene model to intuitively display the ecological restoration of the mine, providing an automated solution and digital display solution for the dynamic measurement of earthwork volume in ecological restoration of historical mines.

[0031] Example 2

[0032] This embodiment discloses a method for calculating the earthwork volume dynamic calculation system in mine ecological restoration based on Cesium. Please refer to Figure 2 As shown, based on the above embodiment, the system calculation includes the following steps: first, regularly collect the three-dimensional real-life model of the historical mine oblique photography, load it in Cesium, input the calculation area and accuracy of the earthwork volume change of ecological restoration, sample and obtain the coordinate point data on the model, and then construct a Delaunay triangulation network, traverse and calculate the difference in volume of the irregular triangular prism formed by all triangulation networks and the reference surface in different periods, and output the total earthwork volume change and the three-dimensional bar chart of the earthwork volume change distribution.

[0033] Furthermore, the calculation method includes: Step S1: Regularly collect and produce oblique photography 3D real scene models of historical mines, and use the format conversion module to convert them into the 3DTiles format supported by Cesium; Step S2: Use the model loading module to load the three-dimensional models of historical mines in different periods in Cesium, and input or draw the calculation area of ​​ecological restoration earthwork volume change in the regional drawing module; Step S3: using the parameter input module to input the calculation accuracy of earthwork volume change, and then the earthwork calculation module obtains the coordinate point data on the surface of the three-dimensional model of historical mines left over from different periods in the calculation area according to the accuracy sampling; Step S4: input the acquired coordinate point data into the earthwork volume calculation algorithm to obtain the earthwork volume change data of historical mines in different periods; Step S5: The mapping output module finally outputs the total amount of earthwork volume change and draws a three-dimensional bar chart of the distribution of earthwork volume change in the calculation area.

[0034] Technical effect of this embodiment: The present invention proposes a Cesium-based dynamic measurement method for earthwork volume in ecological restoration of historical mines, which effectively improves the efficiency and safety of dynamic measurement of earthwork volume in large-scale ecological restoration of historical mines through format conversion and a series of analytical calculations.

[0035] Example 3

[0036] This embodiment discloses a method for calculating the earthwork volume dynamic calculation system in mine ecological restoration based on Cesium. Please refer to Figure 2 As shown, further introduction is given based on the above embodiments.

[0037] The three-dimensional model of historical mines left over from different periods in step S2 in the above embodiment may be a model of any period, and the change of earthwork volume at different time intervals is calculated; The method for confirming the calculation area of ​​the change in earthwork volume of ecological restoration includes: by inputting the coordinates of the inflection points connected at the beginning and the end, and manually drawing on the model.

[0038] Furthermore, the calculation accuracy of the earthwork volume change in step S3 includes 5 levels, and the sampling intervals include 5m, 4m, 3m, 2m, and 1m, and the corresponding parameters are 1-5. When the set parameter value increases, the corresponding sampling interval decreases.

[0039] Furthermore, the earthwork volume calculation algorithm steps in step S4 include: Step S4.1: Generate a polygonal boundary range according to the calculation area input in step S2; Step S4.2: Determine the sampling interval according to the calculation accuracy of the earthwork volume change input in step S3; Step S4.3: Use the clampToHeightMostDetailed function in Cesium to obtain the coordinate point data within the polygon boundary range of the model at different periods according to the sampling interval; Step S4.4: Generate a Delaunay triangulation network with the coordinate point data obtained at different times, and form irregular triangular prisms with the preset reference surface. Each irregular triangular prism can be divided into regular triangular prisms and irregular tetrahedrons by the vertex with the lowest elevation of the triangular element. The difference between the sum of the volumes of all regular triangular prisms and irregular tetrahedrons at different times is the total change in earthwork volume. When the coordinates of one of the triangular element vertices are set to , , In the case of , point B is the lowest point in elevation, and the corresponding elevation is , then the corresponding irregular triangular prism volume calculation formula is: ; in is the volume of a regular triangular prism, and the calculation formula is: ; ; in is the volume of an irregular tetrahedron, and the calculation formula is: ; ; The difference between the total volume of all irregular triangular prisms in different periods is the total change of earthwork volume. The difference between the volumes of individual irregular triangular prisms in different periods can be used to draw the distribution of earthwork volume change. Step S4.5: Output the total amount of earthwork volume change and the distribution data of earthwork volume change.

[0040] Furthermore, the three-dimensional bar graph of the earthwork volume change distribution in step S5 is drawn using the ECharts plug-in, with the triangular face position as the base and the difference in volume of a single irregular triangular prism corresponding to different periods as the value to represent the distribution.

[0041] Technical effect of this embodiment: This application simplifies the tedious process of manually measuring the changes in earthwork volume in the ecological restoration of historical mines, and can also combine with three-dimensional real-scene models to intuitively display the ecological restoration situation, providing an automated solution and digital display solution for the dynamic measurement of earthwork volume in the ecological restoration of historical mines.

[0042] Example 4

[0043] This embodiment introduces a dynamic measurement system for earthwork volume in mine ecological restoration based on Cesium, which is further introduced based on the above embodiment. This embodiment selects a historical mine in Liyang City as the implementation site, and the model data collection period is 3 months.

[0044] The system includes a model loading module, a model comparison module, an earthwork calculation module, and a mapping output module; The model loading module is used to load the three-dimensional real scene models of historical mines in 3DTiles format in March and June; Figure 3-Figure 4 The model comparison module is used to display the three-dimensional real-life models of the two historical mines in March and June, and realize operations such as translation, rotation, and zooming. The two models are displayed in left and right columns, and the changes in the earthwork volume of the two models can be intuitively viewed by moving the columns or models. Figure 3 , Figure 4 On the left is a 3D real-life model of the historical mine left over in June. Figure 3 , Figure 4 On the right is the 3D real-life model of the historical mine left in March. By dragging the bar, you can see that the mine area in March was filled in in June. The earthwork calculation module encapsulates the earthwork calculation algorithm, and is used to input the mine boundary inflection point as the ecological restoration earthwork change calculation area, input the earthwork change calculation accuracy parameter as 3, and calculate the total earthwork change and earthwork change distribution data of the three-dimensional real-life model of the historical mine in March and June; The mapping output module is used to output the total amount of earthwork volume change and draw a three-dimensional bar chart showing the distribution of earthwork volume change. The specific effects are as follows: Figure 5 shown.

[0045] Technical effect of this embodiment: The present invention proposes a dynamic measurement system for earthwork volume in ecological restoration of historical mines based on Cesium, which intuitively displays the ecological restoration of mines through practice combined with a three-dimensional real-scene model, combines the total earthwork volume change with the specific location, and presents it in the form of a three-dimensional bar graph, which helps to discover possible measurement errors or outliers and ensure the accuracy of the calculation results.

[0046] Example 5

[0047] This embodiment discloses a calculation method of a dynamic earthwork volume measurement system in mine ecological restoration based on Cesium, which is further introduced based on the above embodiment. This embodiment selects a historical mine in Liyang City as the implementation site, and the model data collection period is 3 months.

[0048] Specifically, a Cesium-based method for dynamically calculating earthwork volume in ecological restoration of historical mines in this embodiment includes the following steps: Step S1: Regular model data collection: Use drone photogrammetry technology to collect and produce oblique photography 3D real scene models of the target historical mines every 3 months, and use the format conversion function to convert it into the 3DTiles format supported by Cesium for storage. This embodiment collects 3D real scene models of historical mines in three time periods of March, June and September; Step S2: Model data loading: Load the three-dimensional models of the historical mines in March and June in Cesium, and input the turning point of the mine boundary as the calculation area for the change in earthwork volume of ecological restoration; Step S3: Acquisition of coordinate sampling point data: Input the earthwork volume change calculation accuracy parameter as 3, and acquire the coordinate point data on the surface of the three-dimensional model of the historical mines left over in the calculation area in March and June at a sampling interval of 3m; Step S4: earthwork volume calculation: input the acquired coordinate point data into the earthwork volume calculation algorithm to obtain the earthwork volume change data of the historical mines in March and June; Step S5: Result display: Output the total amount of earthwork volume change and draw a three-dimensional bar chart of the earthwork volume change distribution in the calculation area.

[0049] Technical effect of this embodiment: The method for dynamic measurement of earthwork volume in ecological restoration of historical mines based on Cesium proposed by the present invention has been proved through practice that this scheme effectively improves the efficiency and safety of dynamic measurement of earthwork volume in large-scale ecological restoration of historical mines.

[0050] Example 6

[0051] This embodiment discloses a method for calculating the earthwork volume dynamic calculation system in mine ecological restoration based on Cesium, which is further introduced based on the above embodiment. The earthwork volume calculation algorithm steps in step S4 include: Step S4.1: Generate a polygonal boundary range according to the mine boundary inflection points input in step S2; Step S4.2: Determine the sampling interval as 3m according to the earthwork volume change calculation accuracy parameter 3 input in step S3; Step S4.3: Use the clampToHeightMostDetailed function in Cesium to obtain the coordinate point data within the polygon boundary range on the March and June models at a sampling interval of 3m. During this period, it is necessary to determine whether the coordinate point is within the polygon boundary range and whether it is on the historical mine model; Step S4.4: Generate a Delaunay triangulation network with the acquired coordinate point data of the two periods, and form irregular triangular prisms with the preset reference surface. Each irregular triangular prism can be divided into regular triangular prisms and irregular tetrahedrons by the vertex with the lowest elevation of the triangular element. The difference between the sum of the volumes of all regular triangular prisms and irregular tetrahedrons in the two periods is the total change in earthwork volume. Assume that the coordinates of one of the triangular element vertices are , , , point B is the lowest point in elevation, and the corresponding elevation is , then the corresponding irregular triangular prism volume calculation formula is: ; in is the volume of a regular triangular prism, and the calculation formula is: ; ; in is the volume of an irregular tetrahedron, and the calculation formula is: ; ; The difference between the volumes of all irregular triangular prisms in the two periods is the total change in earthwork volume. The difference between the volumes of a single irregular triangular prism in the two periods can be used to plot the distribution of earthwork volume change. Step S4.5: Output the total amount of earthwork volume change and the distribution data of earthwork volume change.

[0052] The three-dimensional bar graph of the earthwork volume change distribution in step S5 is drawn using the ECharts plug-in, with the triangular face position as the base and the difference in volume of a single irregular triangular prism corresponding to two periods as the value to represent the distribution.

[0053] Technical effect of this embodiment: The present invention proposes a Cesium-based dynamic measurement method for earthwork volume in ecological restoration of historical mines, which combines precise geometric analysis and effective mathematical models in practice, and can provide accurate assessment of earthwork volume changes, which has important practical value for historical mine restoration projects.

[0054] The above description is only the preferred embodiment of the present invention, which does not limit the protection scope of the present invention. For those skilled in the art, the present invention can be modified and varied in various ways. Within the spirit and principle of the present invention, any change, modification, replacement, integration and parameter change of these embodiments by conventional substitution or capable of achieving the same function without departing from the principle and spirit of the present invention shall fall within the protection scope of the present invention.

Claims

1. A Cesium-based earthwork volume dynamic measurement system for mine ecological restoration, characterized in that: The system includes a format conversion module, a model loading module, a region drawing module, a parameter input module, an earthwork calculation module, and a mapping output module; The format conversion module is used to convert the collected three-dimensional real scene model of the historical mine into the 3DTiles format supported by Cesium; The model loading module is used to load the historical mine three-dimensional real scene models in 3DTiles format from different periods; The area drawing module is used to draw the ecological restoration earthwork volume change calculation area; The parameter input module is used to input the calculation accuracy of earthwork volume change; The earthwork calculation module encapsulates the earthwork volume calculation algorithm, which is used to calculate the corresponding earthwork volume change total amount and earthwork volume change distribution data; The mapping output module is used to output the total amount of earthwork volume change and to draw a three-dimensional bar chart showing the distribution of earthwork volume change.

2. According to the Cesium-based earthwork volume dynamic measurement system in mine ecological restoration according to claim 1, it is characterized in that: The system also includes a model comparison module; The model comparison module is used to compare and display the loaded three-dimensional real-scene models of historical mines left over from different periods.

3. According to the Cesium-based earthwork volume dynamic measurement system in mine ecological restoration according to claim 2, it is characterized in that: The model comparison module functions include: being able to translate, rotate, and zoom the loaded three-dimensional real-life models of historical mines from different periods; The model comparison module includes left and right columns, which respectively display three-dimensional real-life models of historical mines left over from different periods.

4. The method for calculating the earthwork volume dynamic calculation system in mine ecological restoration based on Cesium according to any one of claims 1 to 3 is characterized in that: The following steps are involved: Step S1: Regularly collect and produce oblique photography 3D real scene models of historical mines, and use the format conversion module to convert them into the 3DTiles format supported by Cesium; Step S2: Use the model loading module to load the three-dimensional models of historical mines in different periods in Cesium, and input or draw the calculation area of ​​ecological restoration earthwork volume change in the regional drawing module; Step S3: using the parameter input module to input the calculation accuracy of earthwork volume change, and then the earthwork calculation module obtains the coordinate point data on the surface of the three-dimensional model of historical mines left over from different periods in the calculation area according to the accuracy sampling; Step S4: input the acquired coordinate point data into the earthwork volume calculation algorithm to obtain the earthwork volume change data of historical mines in different periods; Step S5: The mapping output module finally outputs the total amount of earthwork volume change and draws a three-dimensional bar chart of the distribution of earthwork volume change in the calculation area.

5. According to claim 4, the method for calculating the earthwork volume dynamic calculation system in mine ecological restoration based on Cesium is characterized in that: The three-dimensional model of historical mines in different periods in step S2 can be a model of any period, and the change of earthwork volume at different time intervals is calculated; The method for confirming the calculation area of ​​the change in earthwork volume of ecological restoration includes: by inputting the coordinates of the inflection points connected at the beginning and the end, and manually drawing on the model.

6. According to claim 4, the method for calculating the earthwork volume dynamic calculation system in mine ecological restoration based on Cesium is characterized in that: The calculation accuracy of the earthwork volume change in step S3 includes 5 levels, and the sampling intervals include 5m, 4m, 3m, 2m, and 1m, and the corresponding parameters are 1-5. When the set parameter value increases, the corresponding sampling interval decreases.

7. A method for calculating the earthwork volume dynamic calculation system in mine ecological restoration based on Cesium according to any one of claims 4 to 6, characterized in that: The earthwork volume calculation algorithm steps in step S4 include: Step S4.1: Generate a polygonal boundary range according to the calculation area input in step S2; Step S4.2: Determine the sampling interval according to the calculation accuracy of the earthwork volume change input in step S3; Step S4.3: Use the clampToHeightMostDetailed function in Cesium to obtain the coordinate point data within the polygon boundary range of the model at different periods according to the sampling interval; Step S4.4: Generate a Delaunay triangulation network with the coordinate point data obtained at different times, and form irregular triangular prisms with the preset reference surface. Each irregular triangular prism can be divided into regular triangular prisms and irregular tetrahedrons by the vertex with the lowest elevation of the triangular element. The difference between the sum of the volumes of all regular triangular prisms and irregular tetrahedrons at different times is the total change in earthwork volume. When the coordinates of one of the triangular element vertices are set to , , In the case of , point B is the lowest point in elevation, and the corresponding elevation is , then the corresponding irregular triangular prism volume calculation formula is: ， in is the volume of a regular triangular prism, and the calculation formula is: ， ， in is the volume of an irregular tetrahedron, and the calculation formula is: ， ， The difference between the total volume of all irregular triangular prisms in different periods is the total change of earthwork volume. The difference between the volumes of individual irregular triangular prisms in different periods can be used to draw the distribution of earthwork volume change. Step S4.5: Output the total amount of earthwork volume change and the distribution data of earthwork volume change.

8. According to claim 4, the method for calculating the earthwork volume dynamic calculation system in mine ecological restoration based on Cesium is characterized in that: The three-dimensional bar graph of earthwork volume change distribution in step S5 is drawn using the ECharts plug-in, with the triangular face position as the base and the difference in volume of a single irregular triangular prism corresponding to different periods as the value to represent the distribution.

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