Clearance analysis method and system for civil airport design

Abstract

The invention relates to the field of aerospace, and discloses a clearance analysis method for civil airport design, which comprises the following steps: S1, loading original topographic map data: reading and processing digital topographic data to construct a three-dimensional topographic model; s2, automatically generating a clearance limit surface: automatically generating and displaying the clearance limit surface according to the standard parameters; the invention also discloses a clearance management system for civil airport design, and the system comprises an original topographic map data loading module which is used for reading and processing the digital topographic map data containing the contour lines and the elevation points, and constructing and displaying the three-dimensional terrain model; and a clearance limiting surface automatic generation module. By proposing an accurate calculation method based on tetrahedron filling and excavation, accurate calculation of ultrahigh earthwork and a zero line thereof is realized, and through a batch automatic evaluation method of obstacles in a clearance limitation surface, the problems of large workload and high error rate caused by one-by-one calculation and re-checking when the number of the obstacles is large are solved.

Description

Technical Field

[0001] The present invention relates to the field of aerospace technology, and in particular to a clearance analysis method and system for civil airport design. Background Art

[0002] Airport clearance analysis is one of the important issues that need to be considered during the entire process of airport construction and operation, mainly including the clearance condition analysis of the airport in the early stage, the calculation of the clearance treatment engineering quantity during the airport construction period, and the clearance maintenance during the airport operation period. The clearance condition of the airport site in the early stage is related to the rationality of the site, and the size of the clearance treatment engineering quantity (earthwork quantity) during the airport construction period is directly related to the airport construction cost. In actual work, designers are prone to encounter the following difficulties: First, the clearance treatment range and clearance treatment quantity are generally estimated and determined by designers based on the site terrain conditions. The accuracy of the estimation result is low, which affects the judgment of the airport clearance conditions and the advantages and disadvantages of the construction plan; second, when comparing the clearance treatment plan, each time it is necessary to separately plan the slope plan and calculate the height limit of the restriction surface, the workload is large; third, when there are a large number of clearance obstacles in the existing airport, the clearance assessment needs to be calculated and reviewed one by one, the workload is large and the probability of error is high; fourth, in the early stage of the clearance map drawing, the elevation is frequently adjusted, and elevation errors are prone to occur.

[0003] The existing background technology mainly includes:

[0004] (1) Civil airport clearance safety assessment method

[0005] The safety evaluation of civil airport clearance is an important research issue in the whole process of airport site selection, construction, and operation. To solve this problem, the safety evaluation methods proposed at home and abroad mainly focus on evaluating the safety of civil airport clearance by establishing obstacle limitation surface generation and single obstacle evaluation. The key idea of ​​the obstacle limitation surface generation method is to establish mathematical models of various surfaces (such as take-off climb surface, approach surface, inner horizontal surface, conical surface, etc.) according to the relevant ICAO specifications; the key idea of ​​the single obstacle evaluation method is to first determine the spatial position relationship between each single obstacle and the obstacle limitation surface according to the relevant ICAO specifications, and then calculate the height limit of the obstacle limitation surface at each single obstacle, and then calculate whether the single obstacle exceeds the obstacle limitation surface and the super height value, and finally draw a conclusion on whether the airport clearance is safe based on the super height evaluation conclusion.

[0006] The disadvantage of the above method is that it only evaluates the airport clearance safety based on the results of the obstacle excess height assessment of the obstacle limitation surface, and cannot achieve a comprehensive analysis of the airport clearance conditions and the advantages and disadvantages of the construction plan through the evaluation of key information such as the clearance processing project volume.

[0007] (2) Obstacle restriction surface drawing method based on geographic information and 3D modeling platform

[0008] In recent years, 3D modeling and simulation technology has been widely used in the civil airport clearance safety assessment process. As long as the 3D obstacle restriction surface drawing problem is solved, the surface equation of the obstacle restriction surface is parameterized, and then each surface equation is digitized in 3D. Then the longitude and latitude coordinates and orientation of the obstacle restriction surface are set, and finally the 3D drawing of the obstacle restriction surface is completed based on geographic information (such as ArcGIS, etc.) and 3D modeling platform (AutoCAD, etc.).

[0009] The disadvantage of the above method is that it only focuses on the three-dimensional digitization of the obstacle limitation surface, and does not include the airport clearance analysis based on the three-dimensional digital modeling.

[0010] Therefore, in view of the above defects and shortcomings, the present invention proposes a clearance analysis method and system for civil airport design. Summary of the invention

[0011] In view of the deficiencies in the prior art, the present invention provides a clearance analysis method and system for civil airport design, which solves the problems of inaccurate estimation of clearance handling volume, large and error-prone evaluation workload, and incorrect elevation in clearance map drawing in airport clearance analysis.

[0012] To achieve the above objectives, the present invention is implemented by the following technical solutions: A clearance analysis method for civil airport design, comprising the following steps:

[0013] S1. Loading original terrain map data: reading and processing digital terrain data to construct a three-dimensional terrain model;

[0014] S2. Automatic generation of clearance restriction surface: Automatically generate and display the clearance restriction surface according to the specification parameters;

[0015] S3. Automatic assessment of batch obstacles on clearance restriction surfaces: Automatically assess the relative position relationship between obstacles and clearance restriction surfaces and determine the superelevation situation;

[0016] S4. Automatic generation of single / multi-runway clearance diagram: Automatically generate and display single / multi-runway clearance profile and plan view;

[0017] S5. Earthwork calculation: Calculate and display super-elevated earthwork volume and boundaries based on the tetrahedron cut-fill algorithm.

[0018] Preferably, the step S1 specifically includes the following steps:

[0019] S1.1. Read all contour lines and elevation point information in the digital terrain data file;

[0020] S1.2, perform equal-interval sampling on the contour lines to obtain a set of elevation points on the contour lines;

[0021] S1.3, construct a triangular mesh of the elevation point set based on the Delaunay triangulation algorithm;

[0022] S1.4, vertically project all triangles in the grid to the same horizontal plane, construct a set of tetrahedrons, and obtain the rasterized result of the digital terrain map;

[0023] S1.5, custom rasterization parameter set, including whether to include contour lines, elevation points, layer information, sampling interval, maximum and minimum elevation range;

[0024] S1.6. Rasterize the digital topographic map and extract the elevation value of any point for display.

[0025] Preferably, the step S2 specifically includes the following steps:

[0026] S2.1. Set the surface parameters of the clearance restriction surface according to the civil aviation industry specifications;

[0027] S2.2. Determine the positions of the runway ends on both sides in CAD;

[0028] S2.3. Calculate the boundary points and boundary lines of each restriction surface based on the single runway clearance restriction surface calculation model;

[0029] S2.4, display the calculation results in CAD;

[0030] S2.5. The configurable clearance restriction surface parameters include runway type, runway reference code, runway end elevations, runway name, inner horizontal surface parameters, conical surface parameters, and approach surface parameters.

[0031] Preferably, the step S3 specifically includes the following steps:

[0032] S3.1. Read the single obstacle data file and display it in CAD according to the obstacle coordinate data;

[0033] S3.2, based on the relative geometric relationship judgment algorithm between points and polygons, obtain the relative position relationship between the single obstacle and the clearance restriction surface;

[0034] S3.3. Calculate the height of the clearance restriction surface at the location of a single obstacle inside the clearance restriction surface;

[0035] S3.4. Compare the obstacle height with the clearance restriction surface height at the corresponding position to obtain the super-height situation and super-height value of the single obstacle.

[0036] Preferably, the step S4 specifically includes the following steps:

[0037] S4.1. Determine the clearance restriction surface drawn in CAD;

[0038] S4.2. Calculate and display the clearance profile along the longitudinal direction of the runway;

[0039] S4.3. Calculate and display the clearance profile perpendicular to the runway;

[0040] S4.4. Calculate and display the overhead clearance plan;

[0041] S4.5. Automatically mark the elevation information, length information, design instructions, etc. in the clearance diagram according to the drawing specifications, and display the drawing in a customized layout format with one click;

[0042] S4,6. The system automatically handles single-runway and multi-runway situations. The multi-runway situation is handled based on the parallel multi-runway clearance restriction surface fusion algorithm.

[0043] Preferably, the step S5 specifically includes the following steps:

[0044] S5.1. According to the rasterization results of the digital topographic map and the drawn clearance restriction surface, the calculation of super-high earthwork is completed based on the precise calculation algorithm of tetrahedron filling and cutting;

[0045] S5.2. Generate super-elevation earthwork zero line based on convex hull generation algorithm;

[0046] S5.3. Graphically display the calculation results of super-high earthwork volume and zero line.

[0047] A clearance management system designed for civil airports, including:

[0048] The original topographic map data loading module is used to read and process the digital topographic map data containing contour lines and elevation points, and to construct and display a three-dimensional terrain model;

[0049] A clearance restriction surface automatic generation module, which is used to automatically generate and display the clearance restriction surface according to the clearance restriction surface parameters specified by the civil aviation industry;

[0050] The automatic assessment module for batch obstacles of clearance restriction surfaces is used to automatically read and display obstacle data and assess the relative position relationship between a single obstacle and the clearance restriction surface;

[0051] Single / multi-runway clearance diagram automatic generation module, which is used to automatically generate and display the clearance profile and top view of a single runway or multiple runways based on the generated clearance restriction surface, and automatically mark the elevation information and length information in the clearance diagram;

[0052] The earthwork calculation module is used to calculate the volume of super-high earthwork based on the rasterization results of the digital terrain map and the clearance restriction surface, and to generate and display the zero line of the super-high earthwork and its volume calculation results.

[0053] Preferably, the original topographic map data loading module includes:

[0054] A digital terrain data reading unit, which is used to read a digital terrain map data file containing contour lines and elevation points;

[0055] A contour sampling unit is used to perform equal-interval sampling on contour lines to obtain a set of elevation points on the contour lines;

[0056] A triangular mesh construction unit, which is used to construct a triangular mesh of a set of elevation points based on a Delaunay triangulation algorithm;

[0057] A vertical projection unit, which is used to vertically project all triangles in the triangular mesh onto the same horizontal plane to construct a tetrahedron set;

[0058] A rasterization processing unit, which is used to perform rasterization processing on the digital topographic map, extract the elevation value of any point and display it;

[0059] The rasterization parameter setting unit is used to allow the user to customize the rasterization parameter set.

[0060] Preferably, the clearance restriction surface automatic generation module includes:

[0061] A clearance parameter setting unit, which is used to set the parameters of the clearance restriction surface according to civil aviation industry specifications;

[0062] A runway end position determination unit, which is used to determine the runway end positions on both sides in CAD;

[0063] A restriction surface calculation unit, which is used to calculate the boundary points and boundary lines of each restriction surface based on a single runway clearance restriction surface calculation model;

[0064] The limit surface display unit is used to display the calculation results in CAD.

[0065] Preferably, the single / multi-runway clearance diagram automatic generation module includes:

[0066] A clearance limit surface determination unit, which is used to determine the clearance limit surface that has been drawn in CAD;

[0067] A longitudinal profile generating unit, which is used to calculate and display a clearance profile along the longitudinal direction of the runway;

[0068] A vertical profile generating unit, which is used to calculate and display a clearance profile in a direction vertical to the runway;

[0069] A top-view plan generating unit, which is used to calculate and display a top-view clearance plan;

[0070] Automatic marking unit, which is used to automatically mark the elevation information, length information and design instructions in the clearance drawing according to the drawing specifications;

[0071] The multi-runway fusion unit is used to process and display the fused parallel multi-runway clearance map based on the parallel multi-runway clearance restriction surface fusion algorithm.

[0072] The present invention provides a clearance analysis method and system for civil airport design.

[0073] Beneficial effects:

[0074] 1. The present invention proposes an accurate calculation method based on tetrahedron filling and cutting, thereby realizing accurate calculation of super-high earthwork and super-high earthwork zero line, and solving the problem of low accuracy of manual estimation of clearance processing volume.

[0075] 2. The present invention proposes a batch automatic assessment method for obstacles within the clearance restriction surface, which solves the problem that when there are a large number of clearance obstacles at an airport, they need to be calculated and reviewed one by one, which results in a large workload and a high probability of error.

[0076] 3. The present invention solves the problem that the clearance diagram elevation is prone to errors when the elevation is frequently adjusted in the early stage by proposing a method for automatically generating the clearance diagram and automatically marking the elevation text. BRIEF DESCRIPTION OF THE DRAWINGS

[0077] Figure 1 It is a framework diagram of the system of the present invention;

[0078] Figure 2 is a flow chart of the present invention;

[0079] Figure 3 This is an example diagram of accurate calculation of super-high earthwork and super-high earthwork zero line based on the tetrahedron cut and fill precise algorithm of the present invention;

[0080] Figure 4 This is an example of the automatic batch assessment method for obstacles within the clearance restriction surface of the present invention. Figure 1 ;

[0081] Figure 5 This is an example of the automatic batch evaluation method for obstacles within the clearance restriction surface of the present invention. Figure 2 ;

[0082] Figure 6 A result diagram of the single runway overhead clearance plan of the present invention is drawn;

[0083] Figure 7 A result diagram of the clearance profile of a single runway along the runway direction is drawn for the present invention;

[0084] Figure 8A result diagram of a clearance profile of a single runway perpendicular to the runway direction is drawn for the present invention;

[0085] Fig. 9 A result diagram of the overhead clearance plan of the parallel dual runways of the present invention is drawn;

[0086] Fig.10 The result diagram of the clearance profile in the direction perpendicular to the runway of the parallel double runways of the present invention is drawn. DETAILED DESCRIPTION

[0087] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0088] Example:

[0089] Please see attached Figure 2 The embodiment of the present invention provides a clearance analysis method for civil airport design, comprising the following steps:

[0090] S1. Loading original terrain map data: reading and processing digital terrain data to construct a three-dimensional terrain model;

[0091] S2. Automatic generation of clearance restriction surface: Automatically generate and display the clearance restriction surface according to the specification parameters;

[0092] S3. Automatic assessment of batch obstacles on clearance restriction surfaces: Automatically assess the relative position relationship between obstacles and clearance restriction surfaces and determine the superelevation situation;

[0093] S4. Automatic generation of single / multi-runway clearance diagram: Automatically generate and display single / multi-runway clearance profile and plan view;

[0094] S5. Earthwork calculation: Calculate and display super-elevated earthwork volume and boundaries based on the tetrahedron cut-fill algorithm.

[0095] The S1 step specifically includes the following steps:

[0096] S1.1. Read all contour lines and elevation point information in the digital terrain data file;

[0097] S1.2, perform equal-interval sampling on the contour lines to obtain a set of elevation points on the contour lines;

[0098] S1.3, construct a triangular mesh of the elevation point set based on the Delaunay triangulation algorithm;

[0099] S1.4, vertically project all triangles in the grid to the same horizontal plane, construct a set of tetrahedrons, and obtain the rasterized result of the digital terrain map;

[0100] S1.5, custom rasterization parameter set, including whether to include contour lines, elevation points, layer information, sampling interval, maximum and minimum elevation range;

[0101] S1.6. Rasterize the digital topographic map and extract the elevation value of any point for display.

[0102] The S2 step specifically includes the following steps:

[0103] S2.1. Set the surface parameters of the clearance restriction surface according to the civil aviation industry specifications;

[0104] S2.2. Determine the positions of the runway ends on both sides in CAD;

[0105] S2.3. Calculate the boundary points and boundary lines of each restriction surface based on the single runway clearance restriction surface calculation model;

[0106] S2.4, display the calculation results in CAD;

[0107] S2.5. The configurable clearance restriction surface parameters include runway type, runway reference code, runway end elevations, runway name, inner horizontal surface parameters, conical surface parameters, and approach surface parameters.

[0108] The S3 step specifically includes the following steps:

[0109] S3.1. Read the single obstacle data file and display it in CAD according to the obstacle coordinate data;

[0110] S3.2, based on the relative geometric relationship judgment algorithm between points and polygons, obtain the relative position relationship between the single obstacle and the clearance restriction surface;

[0111] S3.3. Calculate the height of the clearance restriction surface at the location of a single obstacle inside the clearance restriction surface;

[0112] S3.4. Compare the obstacle height with the clearance restriction surface height at the corresponding position to obtain the super-height situation and super-height value of the single obstacle.

[0113] The S4 step specifically includes the following steps:

[0114] S4.1. Determine the clearance restriction surface drawn in CAD;

[0115] S4.2. Calculate and display the clearance profile along the longitudinal direction of the runway;

[0116] S4.3. Calculate and display the clearance profile perpendicular to the runway;

[0117] S4.4. Calculate and display the overhead clearance plan;

[0118] S4.5. Automatically mark the elevation information, length information, design instructions, etc. in the clearance diagram according to the drawing specifications, and display the drawing in a customized layout format with one click;

[0119] S4.6. The system automatically handles single-runway and multi-runway situations. The multi-runway situation is handled based on the parallel multi-runway clearance restriction surface fusion algorithm.

[0120] Step S5 specifically includes the following steps:

[0121] S5.1. According to the rasterization results of the digital topographic map and the drawn clearance restriction surface, the calculation of super-high earthwork is completed based on the precise calculation algorithm of tetrahedron filling and cutting;

[0122] S5.2. Generate super-elevation earthwork zero line based on convex hull generation algorithm;

[0123] S5.3. Graphically display the calculation results of super-high earthwork volume and zero line.

[0124] Please see attached Figure 1 and attached Figure 3 -Attached Fig.10 , a clearance management system designed for civil airports, including:

[0125] The original topographic map data loading module is used to read and process the digital topographic map data containing contour lines and elevation points, and to construct and display a three-dimensional terrain model;

[0126] A clearance restriction surface automatic generation module, which is used to automatically generate and display the clearance restriction surface according to the clearance restriction surface parameters specified by the civil aviation industry;

[0127] The automatic assessment module for batch obstacles of clearance restriction surfaces is used to automatically read and display obstacle data and assess the relative position relationship between a single obstacle and the clearance restriction surface;

[0128] Single / multi-runway clearance diagram automatic generation module, which is used to automatically generate and display the clearance profile and top view of a single runway or multiple runways based on the generated clearance restriction surface, and automatically mark the elevation information and length information in the clearance diagram;

[0129] The earthwork calculation module is used to calculate the volume of super-high earthwork based on the rasterization results of the digital terrain map and the clearance restriction surface, and apply the tetrahedron cut-fill algorithm to generate and display the zero line of the super-high earthwork and its volume calculation results.

[0130] Specifically, the original topographic map data loading module is used to read and process digital topographic map data containing contour lines and elevation points, build and display three-dimensional terrain models, improve the accuracy and processing efficiency of digital topographic maps, and provide a reliable data basis for subsequent clearance analysis. By accurately reading and processing digital topographic maps, the accuracy and visualization of terrain data are ensured. It uses the Delaunay triangulation algorithm to construct a set of elevation points into a triangular mesh, and constructs a set of tetrahedrons through vertical projection to achieve three-dimensional visualization of terrain data.

[0131] The automatic generation module of clearance restriction surface is used to automatically generate and display the clearance restriction surface according to the clearance restriction surface parameters specified by the civil aviation industry. The automatic generation of clearance restriction surface reduces manual operations and improves work efficiency and accuracy. The clearance restriction surface is generated according to the specification parameters to ensure compliance with industry standards and avoid human calculation errors. Based on the single runway clearance restriction surface calculation model, the boundary points and boundary lines of the restriction surface are automatically calculated and displayed by setting parameters such as runway type, benchmark code, elevation, etc.

[0132] The calculation formula is as follows:

[0133] Clearance limit surface parameter equation, such as the inner horizontal surface height H ih =H r +ΔH, where H r is the runway elevation and ΔH is the specified height increase.

[0134] The automatic assessment module for batch obstacles of clearance restriction surface is used to automatically read and display obstacle data, assess the relative position relationship between a single obstacle and the clearance restriction surface, assess obstacles in batches, reduce manual calculations, reduce the probability of errors, and improve assessment efficiency. It can quickly determine whether an obstacle exceeds the clearance restriction surface and calculate its superelevation to ensure airport clearance safety. Based on the relative geometric relationship judgment algorithm between points and polygons, the relative position relationship between obstacles and clearance restriction surfaces is calculated, and the heights are compared.

[0135] Relative geometric relationship judgment formula, obstacle height and clearance limit surface height comparison formula ΔH=H obstacle -H limit , where H obstacle is the obstacle height, H limit To limit the surface height.

[0136] The module for automatically generating clearance diagrams for single / multi-runways is used to automatically generate and display clearance profiles and top-view plans for single or multi-runways based on the generated clearance restriction surfaces, and automatically annotate the elevation information and length information in the clearance diagrams. Clearance diagrams are automatically generated to improve drawing efficiency and accuracy, and ensure the accuracy of elevation information. Clearance diagrams are generated to provide comprehensive clearance analysis results, which facilitates designers and managers to make judgments and decisions. Based on the parameters of the generated clearance restriction surfaces, longitudinal and vertical profiles and top-view plans are calculated, and elevation and length information are automatically annotated.

[0137] Clearance profile calculation formula, clearance profile formula along the runway direction H profile =f(x, y, z), where x, y, z are spatial coordinates.

[0138] The earthwork calculation module is used to calculate the volume of super-high earthwork based on the rasterization results of the digital terrain map and the clearance restriction surface, and to apply the tetrahedron cut-fill algorithm to generate and display the zero line of the super-high earthwork and its volume calculation results. It accurately calculates the volume of earthwork, reduces manual estimation errors, and provides detailed earthwork processing information. It calculates the volume and boundary of super-high earthwork, provides data support for the clearance processing engineering quantity, and optimizes the construction plan.

[0139] Based on the tetrahedron cut-fill algorithm, the super-elevation earthwork volume and zero line are generated by calculating the rasterized digital topographic map data and the clearance restriction surface.

[0140] Tetrahedron cut and fill volume calculation formula in are the vertex vectors of the tetrahedron.

[0141] The original topographic map data loading module includes:

[0142] A digital terrain data reading unit, which is used to read a digital terrain map data file containing contour lines and elevation points;

[0143] A contour sampling unit is used to perform equal-interval sampling on contour lines to obtain a set of elevation points on the contour lines;

[0144] A triangular mesh construction unit, which is used to construct a triangular mesh of a set of elevation points based on a Delaunay triangulation algorithm;

[0145] A vertical projection unit, which is used to vertically project all triangles in the triangular mesh onto the same horizontal plane to construct a tetrahedron set;

[0146] A rasterization processing unit, which is used to perform rasterization processing on the digital topographic map, extract the elevation value of any point and display it;

[0147] The rasterization parameter setting unit is used to allow the user to customize the rasterization parameter set.

[0148] Specifically, the present invention provides a method for reading a digital topographic map containing contour lines and elevation points and displaying it using AutoCAD.

[0149] First, read the information of all contour lines and all elevation points in the digital terrain data file, and sample the contour lines at equal intervals to obtain a set of elevation points on the contour lines; secondly, construct a triangular mesh of the elevation point set based on the Delaunay triangulation algorithm; then, project all triangles in the mesh vertically to the same horizontal plane, construct a set of tetrahedrons, and obtain the rasterized result of the digital terrain map.

[0150] Before rasterizing the digital topographic map, you can customize the rasterization parameter set, which mainly includes: whether to include contour lines, whether to include elevation points, the layer where the contour lines are located, the layer where the elevation points are located, the contour line sampling interval (in meters), the maximum and minimum elevation range (mainly used to filter out abnormal elevation points that may exist in the original data of the digital topographic map, such as excessively large elevation values, in meters), etc. After rasterizing the digital topographic map, you can extract the elevation value of any point and display it.

[0151] The automatic generation module of clearance restriction surface includes:

[0152] A clearance parameter setting unit, which is used to set the parameters of the clearance restriction surface according to civil aviation industry specifications;

[0153] A runway end position determination unit, which is used to determine the runway end positions on both sides in CAD;

[0154] A restriction surface calculation unit, which is used to calculate the boundary points and boundary lines of each restriction surface based on a single runway clearance restriction surface calculation model;

[0155] The limit surface display unit is used to display the calculation results in CAD.

[0156] Specifically, first, according to the civil aviation industry specifications, the surface parameters of the clearance restriction surface are set; secondly, the positions of the runway ends on both sides are determined in CAD; then, based on the surface parameters and the single runway clearance restriction surface calculation model, the boundary points and boundary lines of each restriction surface are calculated and displayed in CAD. Figure 4 shown.

[0157] The surface parameters of the clearance limitation surface that can be set include: runway type, runway reference code, runway end elevations, runway name, inner horizontal surface parameters (height and radius), conical surface parameters (height and slope), approach surface parameters (inner edge length, distance from the runway threshold, divergence rate, first segment length and slope, second segment length and slope, horizontal segment length, and total length).

[0158] The single / multi-runway clearance diagram automatic generation module includes:

[0159] A clearance limit surface determination unit, which is used to determine the clearance limit surface that has been drawn in CAD;

[0160] A longitudinal profile generating unit, which is used to calculate and display a clearance profile along the longitudinal direction of the runway;

[0161] A vertical profile generating unit, which is used to calculate and display a clearance profile in a direction vertical to the runway;

[0162] A top-view plan generating unit, which is used to calculate and display a top-view clearance plan;

[0163] Automatic marking unit, which is used to automatically mark the elevation information, length information and design instructions in the clearance drawing according to the drawing specifications;

[0164] The multi-runway fusion unit is used to process and display the fused parallel multi-runway clearance map based on the parallel multi-runway clearance restriction surface fusion algorithm.

[0165] Specifically, first, determine the clearance restriction surface that has been drawn in CAD; second, calculate and display the clearance profile along the longitudinal direction of the runway; third, calculate and display the clearance profile in the direction perpendicular to the runway; then, calculate and display the top view clearance plan; the clearance profile calculation formula is as follows: H profile =f(x, y, z);

[0166] Finally, according to the drawing specifications, the elevation information, length information, design instructions, etc. in the clearance diagram are automatically annotated, and the drawing is displayed in a customized layout format with one click. Elevation information annotation: ElevationLabel = CalculateElevation(x,y).

[0167] For the case of a single runway, the system automatically completes the above-mentioned clearance map drawing work; for the case of parallel multiple runways, the system determines multiple drawn clearance restriction surfaces and, based on the parallel multiple runway clearance restriction surface fusion algorithm, calculates and displays the fused parallel multiple runway clearance map.

[0168] Example picture Figure 6 , Figure 7 , Figure 8 , Fig. 9and Fig.10 The clearance diagram includes: clearance section diagram along the longitudinal direction of the runway, clearance section diagram perpendicular to the runway direction and clearance plan diagram from above. The clearance section diagram along the longitudinal direction of the runway includes the name and slope text of the take-off and climb surface, the name and slope text of the approach surface, the name and slope text of the tapered surface, the name and height text of the inner horizontal surface, the name and length text of the lift strip, and the length text between all adjacent intersections of the take-off and climb surface, approach surface, tapered surface and approach surface.

[0169] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A clearance analysis method for civil airport design, characterized in that: The following steps are involved: S1. Loading original terrain map data: reading and processing digital terrain data to construct a three-dimensional terrain model; S2. Automatic generation of clearance restriction surface: Automatically generate and display the clearance restriction surface according to the specification parameters; S3. Automatic assessment of batch obstacles on clearance restriction surfaces: Automatically assess the relative position relationship between obstacles and clearance restriction surfaces and determine the superelevation situation; S4. Automatic generation of single / multi-runway clearance diagram: Automatically generate and display single / multi-runway clearance profile and plan view; S5. Earthwork calculation: Calculate and display super-elevated earthwork volume and boundaries based on the tetrahedron cut-fill algorithm.

2. A clearance analysis method for civil airport design according to claim 1, characterized in that: The S1 step specifically includes the following steps: S1.

1. Read all contour lines and elevation point information in the digital terrain data file; S1.2, perform equal-interval sampling on the contour lines to obtain a set of elevation points on the contour lines; S1.3, construct a triangular mesh of the elevation point set based on the Delaunay triangulation algorithm; S1.4, vertically project all triangles in the grid to the same horizontal plane, construct a set of tetrahedrons, and obtain the rasterized result of the digital terrain map; S1.5, custom rasterization parameter set, including whether to include contour lines, elevation points, layer information, sampling interval, maximum and minimum elevation range; S1.

6. Rasterize the digital topographic map and extract the elevation value of any point for display.

3. The clearance analysis method for civil airport design according to claim 1 is characterized in that: The S2 step specifically includes the following steps: S2.

1. Set the surface parameters of the clearance restriction surface according to the civil aviation industry specifications; S2.

2. Determine the positions of the runway ends on both sides in CAD; S2.

3. Calculate the boundary points and boundary lines of each restriction surface based on the single runway clearance restriction surface calculation model; S2.4, display the calculation results in CAD; S2.

5. The configurable clearance restriction surface parameters include runway type, runway reference code, runway end elevations, runway name, inner horizontal surface parameters, conical surface parameters, and approach surface parameters.

4. The clearance analysis method for civil airport design according to claim 1 is characterized in that: The S3 step specifically includes the following steps: S3.

1. Read the single obstacle data file and display it in CAD according to the obstacle coordinate data; S3.2, based on the relative geometric relationship judgment algorithm between points and polygons, obtain the relative position relationship between the single obstacle and the clearance restriction surface; S3.

3. Calculate the height of the clearance restriction surface at the location of a single obstacle inside the clearance restriction surface; S3.

4. Compare the obstacle height with the clearance restriction surface height at the corresponding position to obtain the super-height situation and super-height value of the single obstacle.

5. The clearance analysis method for civil airport design according to claim 1 is characterized in that: The S4 step specifically includes the following steps: S4.

1. Determine the clearance restriction surface drawn in CAD; S4.

2. Calculate and display the clearance profile along the longitudinal direction of the runway; S4.

3. Calculate and display the clearance profile perpendicular to the runway; S4.

4. Calculate and display the overhead clearance plan; S4.

5. Automatically mark the elevation information, length information, design instructions, etc. in the clearance diagram according to the drawing specifications, and display the drawing in a customized layout format with one click; S4.

6. The system automatically handles single-runway and multi-runway situations. The multi-runway situation is handled based on the parallel multi-runway clearance restriction surface fusion algorithm.

6. The clearance analysis method for civil airport design according to claim 1 is characterized in that: The step S5 specifically includes the following steps: S5.

1. According to the rasterization results of the digital topographic map and the drawn clearance restriction surface, the calculation of super-high earthwork is completed based on the precise calculation algorithm of tetrahedron filling and cutting; S5.

2. Generate super-elevation earthwork zero line based on convex hull generation algorithm; S5.

3. Graphically display the calculation results of super-high earthwork volume and zero line.

7. A clearance management system designed for civil airports, characterized in that: Used in conjunction with a clearance analysis method for civil airport design as described in any one of claims 1 to 6, comprising: The original topographic map data loading module is used to read and process the digital topographic map data containing contour lines and elevation points, and to construct and display a three-dimensional terrain model; A clearance restriction surface automatic generation module, which is used to automatically generate and display the clearance restriction surface according to the clearance restriction surface parameters specified by the civil aviation industry; The automatic assessment module for batch obstacles of clearance restriction surfaces is used to automatically read and display obstacle data and assess the relative position relationship between a single obstacle and the clearance restriction surface; Single / multi-runway clearance diagram automatic generation module, which is used to automatically generate and display the clearance profile and top view of a single runway or multiple runways based on the generated clearance restriction surface, and automatically mark the elevation information and length information in the clearance diagram; The earthwork calculation module is used to calculate the volume of super-high earthwork based on the rasterization results of the digital terrain map and the clearance restriction surface, and apply the tetrahedron cut-fill algorithm to generate and display the zero line of the super-high earthwork and its volume calculation results.

8. The clearance management system designed for civil airports according to claim 7 is characterized in that: The original topographic map data loading module includes: A digital terrain data reading unit, which is used to read a digital terrain map data file containing contour lines and elevation points; A contour sampling unit is used to perform equal-interval sampling on contour lines to obtain a set of elevation points on the contour lines; A triangular mesh construction unit, which is used to construct a triangular mesh of a set of elevation points based on a Delaunay triangulation algorithm; A vertical projection unit, which is used to vertically project all triangles in the triangular mesh onto the same horizontal plane to construct a tetrahedron set; A rasterization processing unit, which is used to perform rasterization processing on the digital topographic map, extract the elevation value of any point and display it; The rasterization parameter setting unit is used to allow the user to customize the rasterization parameter set.

9. The clearance management system designed for civil airports according to claim 7 is characterized in that: The clearance restriction surface automatic generation module comprises: A clearance parameter setting unit, which is used to set the parameters of the clearance restriction surface according to civil aviation industry specifications; A runway end position determination unit, which is used to determine the runway end positions on both sides in CAD; A restriction surface calculation unit, which is used to calculate the boundary points and boundary lines of each restriction surface based on a single runway clearance restriction surface calculation model; The limit surface display unit is used to display the calculation results in CAD.

10. The clearance management system designed for civil airports according to claim 7, characterized in that: The single / multi-runway clearance map automatic generation module includes: A clearance limit surface determination unit, which is used to determine the clearance limit surface that has been drawn in CAD; A longitudinal profile generating unit, which is used to calculate and display a clearance profile along the longitudinal direction of the runway; A vertical profile generating unit, which is used to calculate and display a clearance profile in a direction vertical to the runway; A top-view plan generating unit, which is used to calculate and display a top-view clearance plan; Automatic marking unit, which is used to automatically mark the elevation information, length information and design instructions in the clearance drawing according to the drawing specifications; The multi-runway fusion unit is used to process and display the fused parallel multi-runway clearance map based on the parallel multi-runway clearance restriction surface fusion algorithm.

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