Method and system for constructing three-dimensional surface of reference height for airport clearance obstacle assessment

Abstract

The present invention discloses a method and system for constructing a three-dimensional reference height surface for airport clearance obstacle assessment. The method comprises: S1, constructing a plane coordinate system on a three-dimensional geographic information system (GIS), obtaining runway data of a research airport and projecting it onto the plane coordinate system using the NTS class library, and projecting a clearance restriction zone parameter table onto the plane coordinate system using the NTS class library; S2, dividing each restriction zone from the center of the runway outward in the plane coordinate system based on a clearance graphic element spatial operation model; S3, setting height restriction parameters corresponding to each restriction zone, and constructing corresponding three-dimensional reference height surfaces for obstacle assessment on the three-dimensional geographic information system (GIS) according to the height restriction parameters of each restriction zone using the Cesium library model. The clearance graphic element spatial operation model of the present invention constructs each restriction zone corresponding to the clearance restriction zone parameter table and constructs a three-dimensional reference height surface for obstacle assessment using the Cesium library model, which can quickly and accurately achieve target obstacle assessment.

Description

Technical Field

[0001] The present invention relates to the field of airport clearance obstacle assessment, and in particular to an airport clearance obstacle assessment reference height three-dimensional surface construction assessment method and system. Background Art

[0002] The airport clear zone refers to the restricted space area around the airport where clearance obstacles are marked to ensure the safety of aircraft takeoff, landing and go-around. The quality of clearance conditions is directly related to flight safety. The presence of super-high obstacles (such as buildings, mountains, communication towers, etc.) in the airport clear zone will seriously affect the takeoff and landing of aircraft, and may even cause flight accidents; therefore, the assessment of clearance obstacles is an important part of ensuring flight safety. According to relevant regulations, the airport clearance reference altitude is composed of elements such as the clearance reference altitude of the obstacle limitation surface area, the flight procedure clearance reference altitude, and the minimum surveillance guidance clearance reference altitude. The clearance reference altitude of the horizontally projected overlapping area within the flight procedure area is the lower value of the minimum surveillance guidance clearance reference altitude and the flight procedure clearance reference altitude.

[0003] With the acceleration of urbanization, many airports originally located in suburban areas are now surrounded by cities. The increasing height of buildings within airport areas and surrounding buildings is leading to increasingly complex airspace environments. In this context, airport airspace obstacle assessments must not only consider flight safety but also urban planning and economic development to achieve coordinated development between the airport and the city. Airspace obstacle assessment is a crucial component of airport airspace risk management. By identifying, analyzing, and evaluating obstacles within the airspace, it provides a basis for decision-making in airport safety management. Airspace reference height surface assessment is a crucial component of airport airspace risk management. Through scientific assessment, the impact of obstacles on aircraft flight can be evaluated, providing a basis for decision-making in airport safety management. For example, within an airport obstacle restriction area, obstacle height restrictions cannot be relaxed by adjusting flight procedures or airport operating minimums. Furthermore, construction projects that may impact aircraft flight must undergo airspace audits. With the development of 3D visualization and digital management technologies, the efficiency and accuracy of airspace reference height surface assessments have significantly improved. However, current assessments of target obstacles rely primarily on manual calculations, which suffer from low management efficiency and complex data, hindering rapid decision-making regarding target obstacles. Summary of the Invention

[0004] The purpose of the present invention is to solve the technical problems pointed out by the background technology, and to provide a method and system for constructing a three-dimensional reference height surface for airport clearance obstacle assessment. Through the spatial operation model of the clearance graphic elements, each restricted area is successively delineated outward from the center of the runway. Based on the parameter data of the clearance restriction area parameter table, each restricted area is constructed in the corresponding study area in the three-dimensional geographic information system GIS. By setting the height limit parameters of each restricted area and using the Cesium library model to construct the corresponding three-dimensional reference height surface for obstacle assessment, the effective construction of the three-dimensional reference height surface for obstacle assessment of clearance obstacle protection is achieved, which can scientifically, quickly and accurately realize the risk assessment of existing and planned target obstacles.

[0005] The purpose of the present invention is achieved through the following technical solutions:

[0006] A method for constructing a three-dimensional surface for evaluating airport clearance obstacle assessment reference heights, the method comprising:

[0007] S1. Construct a plane coordinate system on a 3D geographic information system (GIS), obtain runway data for the study airport, and project it onto the plane coordinate system using the NTS library. Construct a clearance restriction zone parameter table, which includes runway obstacle restriction parameters, runway takeoff and landing area obstacle restriction parameters, and surrounding clearance restriction parameters. Project the clearance restriction zone parameter table onto the plane coordinate system using the NTS library.

[0008] S2. In a plane coordinate system, based on the spatial computational model of the clearance graphic elements, the seventh restricted area, the runway obstacle limitation surface area, the sixth restricted area, the fifth restricted area, the fourth restricted area, the third restricted area, the second restricted area, and the first restricted area are successively divided outward from the center of the runway;

[0009] S3. Set the height restriction parameters corresponding to the seventh restricted area, the runway obstacle limitation surface area, the sixth restricted area, the fifth restricted area, the fourth restricted area, the third restricted area, the second restricted area, and the first restricted area, respectively. Use the Cesium library model to construct corresponding obstacle assessment reference height three-dimensional surfaces on the three-dimensional geographic information system (GIS) according to the height restriction parameters corresponding to the seventh restricted area, the runway obstacle limitation surface area, the sixth restricted area, the fifth restricted area, the fourth restricted area, the third restricted area, the second restricted area, and the first restricted area.

[0010] To better implement the present invention, the runway obstacle limitation parameters in the clearance restricted area parameter table are associated with the seventh restricted area and the runway obstacle limitation surface area; the runway take-off and landing area obstacle limitation parameters in the clearance restricted area parameter table are associated with the fourth restricted area, the third restricted area, and the second restricted area; and the surrounding clearance limitation parameters in the clearance restricted area parameter table are associated with the first restricted area.

[0011] Preferably, the graphic elements and spatial structure of the clearance graphic element spatial calculation model are as follows:

[0012] The graphic element of the seventh restricted area is a rectangular graphic around the runway centerline;

[0013] The runway obstacle limitation surface is located outside the seventh restricted area and is designated to meet the requirements of aircraft flight procedures and research airport clearance.

[0014] The image element of the sixth restricted area is a rectangular figure located outside the runway obstacle limitation surface area and does not include the runway obstacle limitation surface;

[0015] The image element of the fifth restricted area is a rectangular figure connected to the sixth restricted area and does not include the runway obstacle limitation surface;

[0016] The image element of the fourth restricted area is a rectangular area extending perpendicular to the runway centerline outside the sixth and fifth restricted areas and excluding the sixth and fifth restricted areas;

[0017] The image elements of the third restricted area are two rectangular areas connected to the fourth restricted area and extending to both ends of the runway centerline;

[0018] The graphic element of the second restricted area is the circular area outside the third restricted area and does not include the third restricted area;

[0019] The graphic element of the first restricted area is the area outside the circle of the second restricted area and does not include the second restricted area;

[0020] The seventh restricted area, the runway obstacle limitation surface area, the sixth restricted area, the fifth restricted area, the fourth restricted area, the third restricted area, the second restricted area and the first restricted area are constructed in sequence and continuously without crossing or overlapping.

[0021] Preferably, the clearance graphic element spatial calculation model adjusts the sizes of the seventh restricted area and the runway obstacle limitation surface area according to the set parameters in the runway obstacle limitation parameters; the clearance graphic element spatial calculation model adjusts the sizes of the fourth restricted area, the third restricted area, and the second restricted area according to the set parameters in the runway take-off and landing area obstacle limitation parameters; and the clearance graphic element spatial calculation model adjusts the size of the first restricted area according to the set parameters in the surrounding clearance limitation parameters.

[0022] Preferably, the seventh restricted area is a rectangular area enclosed by A1 extending outward from both ends of the runway centerline and A2 extending on both sides of the runway centerline in a perpendicular direction; the setting parameters in the runway obstacle limitation parameters include parameters A1 and A2.

[0023] Preferably, the runway obstacle limitation parameters include a runway takeoff climb offset angle, and the height limitation parameter corresponding to the runway obstacle limitation surface area is constructed by performing slope height construction based on the nominal track angle of the aircraft flight procedure and the runway takeoff climb offset angle.

[0024] Preferably, the present invention also includes the following method:

[0025] S4. Construct an existing or planned target obstacle and construct it in a three-dimensional geographic information system (GIS). Obtain a three-dimensional reference height surface for obstacle assessment according to methods S1 to S3. Evaluate the target obstacle based on the three-dimensional reference height surface. If part of the target obstacle is located on the three-dimensional reference height surface and the height of the target obstacle is higher than the height of the corresponding position on the three-dimensional reference height surface, the target obstacle is a target obstacle that needs to be rectified and an early warning is output.

[0026] A three-dimensional surface construction and evaluation system for reference height of airport clearance obstacle assessment includes a three-dimensional geographic information system (GIS), a clearance restriction zone parameter table, a clearance graphic element spatial operation model, and a Cesium library model. A plane coordinate system is constructed inside the three-dimensional geographic information system (GIS), and runway data of the research airport is obtained and projected onto the plane coordinate system using the NTS library. The clearance restriction zone parameter table includes runway obstacle restriction parameters, runway take-off and landing area obstacle restriction parameters, and surrounding clearance restriction parameters, and the clearance restriction zone parameter table is projected onto the plane coordinate system using the NTS library. The clearance graphic element spatial operation model divides the seventh restriction zone from the center of the runway outward in the plane coordinate system. area, runway obstacle limitation surface area, sixth restriction area, fifth restriction area, fourth restriction area, third restriction area, second restriction area and first restriction area; the Cesium library model sets the height restriction parameters corresponding to the seventh restriction area, runway obstacle limitation surface area, sixth restriction area, fifth restriction area, fourth restriction area, third restriction area, second restriction area and first restriction area respectively; the Cesium library model constructs the corresponding obstacle assessment reference height three-dimensional surfaces on the three-dimensional geographic information system GIS according to the height restriction parameters corresponding to the seventh restriction area, runway obstacle limitation surface area, sixth restriction area, fifth restriction area, fourth restriction area, third restriction area, second restriction area and first restriction area.

[0027] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0028] (1) The present invention uses a clearance graphic element spatial calculation model to successively delineate various restricted areas outward from the runway center as a reference, and constructs various restricted areas corresponding to the study area in the three-dimensional geographic information system (GIS) based on the parameter data of the clearance restriction area parameter table. By setting the height limit parameters of each restricted area and using the Cesium library model to construct the corresponding obstacle assessment reference height three-dimensional surface, the obstacle assessment reference height three-dimensional surface for clearance obstacle protection is effectively constructed, and the risk assessment of existing and planned target obstacles can be achieved scientifically, quickly and accurately.

[0029] (2) The present invention significantly improves the efficiency of airspace management and simplifies the approval process for airspace obstacles, which not only improves the safety management level of the airport, but also promotes the coordinated development of the airport and the local economy. By optimizing the approval process and providing data support, it provides strong technical support for building planning and airport expansion and renovation.

[0030] (3) The present invention can be widely applied to related fields such as urban planning, power planning, and airport management near airports, and has the advantages of fast and accurate evaluation and high security. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 A flow chart of a method for constructing a three-dimensional reference height surface for evaluating airport clearance obstacles according to the present invention;

[0032] Figure 2 This is a schematic diagram of parameter settings associated with the first restricted area in the clearance restricted area parameter table in the embodiment;

[0033] Figure 3 This is a diagram showing the main parameters of the first to seventh restricted areas in the example of the clearance restricted area parameter table in the embodiment;

[0034] Figure 4 Schematic diagram of the graphic elements and spatial structure positions of the clearance graphic element spatial calculation model in the embodiment;

[0035] Figure 5 for Figure 4 Schematic diagram of the principle of dividing and constructing the seventh restricted area according to example parameters;

[0036] Figure 6 for Figure 4 Schematic diagram of the principle of dividing and constructing the middle runway obstacle restriction surface according to example parameters;

[0037] Figure 7 This is a rendering of the restricted areas of an airport based on the spatial computational model of clearance graphic elements.

[0038] Figure 8This is a schematic diagram of a trial example of the method of the present invention at an airport in Lincang City, Yunnan Province, and using the obstacle assessment reference height three-dimensional surface to perform target obstacle assessment and early warning;

[0039] Figure 9 This is a schematic diagram of a trial example of the method of the present invention at a Beijing airport and using the obstacle assessment reference height three-dimensional surface to perform target obstacle assessment and early warning. DETAILED DESCRIPTION

[0040] Below in conjunction with embodiment, the present invention is described in further detail:

[0041] Example

[0042] like Figure 1 As shown, a method for constructing a three-dimensional surface of reference height for airport clearance obstacle assessment is provided, the method comprising:

[0043] S1. Construct a plane coordinate system in a 3D geographic information system (GIS). Obtain runway data for the study airport and project it onto the plane coordinate system using the NTS library. Construct a table of clearance restriction parameters, including runway obstacle restriction parameters, runway takeoff and landing area obstacle restriction parameters, and surrounding clearance restriction parameters. Project the table onto the plane coordinate system using the NTS library. There are several parameter input items in the clearance restricted area parameter table. Based on the requirements of the research airport for clearance obstacles (including general requirements, special requirements and / or artificially set requirements, examples of special requirements are high-altitude airports or wind shear at high-altitude airports, etc., and examples of artificially set requirements include settings for specific safety considerations or safety settings that are higher than the requirements of regulations and specifications), the runway obstacle restriction parameters, runway take-off and landing area obstacle restriction parameters and surrounding clearance restriction parameters in the clearance restricted area parameters are classified according to the restriction parameters of the spatial structure. The runway obstacle restriction parameters in the clearance restricted area parameter table correspond to the associated seventh restriction area and runway obstacle restriction surface area. The runway take-off and landing area obstacle restriction parameters in the clearance restricted area parameter table correspond to the associated fourth restriction area, third restriction area and second restriction area. The surrounding clearance restriction parameters in the clearance restricted area parameter table correspond to the associated first restriction area. Figure 2 As shown in the figure, the parameter setting diagram of the surrounding clearance restriction parameters associated with the first restriction zone in the clearance restriction zone parameter table is shown. Another example is as follows: the runway obstacle restriction parameters include the runway takeoff climb offset angle, and the height restriction parameters corresponding to the runway obstacle restriction surface area in method S2 are constructed based on the nominal track angle of the aircraft flight procedure and the runway takeoff climb offset angle for the slope height. Figure 3As shown in the figure, the main parameter diagram of the clearance restricted area parameter table is shown in the first to seventh restricted areas, and the main parameter setting examples of the clearance restricted area parameter table associated with the first to seventh restricted areas (the seventh restricted area, the runway obstacle limitation surface area, the sixth restricted area, the fifth restricted area, the fourth restricted area, the third restricted area, the second restricted area and the first restricted area) are shown in the figure. Figure 3 This is just an example, and the specific parameter data is blurred. The specific data should not be made public and will not affect technical understanding).

[0044] S2. In a plane coordinate system, based on the clearance graphic element spatial computation model, the seventh restricted area, the runway obstacle restriction surface area, the sixth restricted area, the fifth restricted area, the fourth restricted area, the third restricted area, the second restricted area, and the first restricted area are successively demarcated from the center of the runway outward. The seventh restricted area, the runway obstacle restriction surface area, the sixth restricted area, the fifth restricted area, the fourth restricted area, the third restricted area, the second restricted area, and the first restricted area are each used as an image element of the clearance graphic element spatial computation model and have a defined spatial structure. The clearance graphic element spatial computation model is constructed based on all image elements (specifically, the seventh restricted area, the runway obstacle restriction surface area, the sixth restricted area, the fifth restricted area, the fourth restricted area, the third restricted area, the second restricted area, and the first restricted area) and their spatial structure, and is applied to the adjustment of parameters in the clearance restricted area parameters.

[0045] In some embodiments, the relationship between the graphic elements and the spatial structure of the clearance graphic element space operation model is as follows (eg Figure 4 shown):

[0046] The graphic element of the seventh restricted area is a rectangular shape around the center line of the runway.

[0047] The runway obstacle limitation surface is a runway obstacle limitation surface located outside the seventh restricted area and is designed to meet the aircraft flight procedures and research airport clearance requirements.

[0048] The image element of the sixth restricted area is a rectangular figure located outside the runway obstacle limitation surface area and does not include the runway obstacle limitation surface.

[0049] The image element of the fifth restricted area is a rectangular figure connected to the sixth restricted area and does not include the runway obstacle limitation surface.

[0050] The image element of the fourth restricted area is a rectangular area located outside the sixth restricted area and the fifth restricted area and extending perpendicularly along the centerline of the runway, but excluding the sixth restricted area and the fifth restricted area.

[0051] The image elements of the third restricted area are two rectangular areas connected to the fourth restricted area and extending to both ends of the runway centerline.

[0052] The graphic element of the second restricted area is a circle outside the third restricted area and does not include the third restricted area.

[0053] The graphic element of the first restricted area is the circle outside the second restricted area and does not include the second restricted area; in actual use, based on the study of airport security conditions, the first restricted area may not exist.

[0054] The spatial structural relationship restriction conditions of each restricted area are: the seventh restricted area, runway obstacle limitation surface area, sixth restricted area, fifth restricted area, fourth restricted area, third restricted area, second restricted area and first restricted area are constructed in sequence and continuously without crossing or overlapping.

[0055] In some embodiments, Figure 4 In the figure, according to the runway direction, the left side is Area A (if there are two areas on the left and right of the restricted area, they are further divided into Area A and Area B below the restricted area. If more in-depth parameter settings for Area A and Area B are required, that is, for applications with special requirements or / and manual settings, the parameters can be set accordingly), and the right side is Area B; based on the runway, Area A is the area from 180 degrees to 360 degrees on the left, and the rest is Area B; if the runway direction is due south and due north, the upper part is Area A and the lower part is Area B.

[0056] S3. The spatial calculation model of the clearance graphic elements adjusts the size of the seventh restricted area and the runway obstacle restriction surface area according to the set parameters in the runway obstacle restriction parameters. The seventh restricted area is a rectangular area enclosed by A1 extending outward from both ends of the runway centerline and A2 extending on both sides of the runway centerline in the vertical direction; the set parameters in the runway obstacle restriction parameters include A1 and A2 parameters. If the A1 and A2 parameters are 4km and 1.5km respectively, the size of the seventh restricted area is adjusted as follows: Figure 5 shown. Figure 6 Corresponding to the parameters associated with the runway obstacle restriction surface area, and based on the parameters, a Figure 6 The runway obstacle restriction surface area is shown. The clearance graphic element spatial computation model adjusts the size of the fourth restricted area, the third restricted area, and the second restricted area according to the parameters set in the runway takeoff and landing area obstacle restriction parameters. The clearance graphic element spatial computation model adjusts the size of the first restricted area according to the parameters set in the surrounding clearance restriction parameters.

[0057] Set the height restriction parameters corresponding to the seventh restricted area, runway obstacle limitation surface area, sixth restricted area, fifth restricted area, fourth restricted area, third restricted area, second restricted area and first restricted area respectively, and use the Cesium library model to construct the corresponding obstacle assessment reference height three-dimensional surface on the three-dimensional geographic information system GIS according to the height restriction parameters corresponding to the seventh restricted area, runway obstacle limitation surface area, sixth restricted area, fifth restricted area, fourth restricted area, third restricted area, second restricted area and first restricted area. Figure 7 As shown in the figure, based on the spatial operation model of the clearance graphic elements, the restricted areas of an airport are divided and a three-dimensional surface with reference height for obstacle assessment is constructed. The effect is as follows Figure 7 As shown, Figure 7 The actual software has a three-dimensional effect. In order to better show the effects of the seventh restricted area, runway obstacle restriction surface area, sixth restricted area, fifth restricted area, fourth restricted area, third restricted area, second restricted area and first restricted area, they are displayed in cross-section.

[0058] S4. Construct an existing or planned target obstacle and construct it in the three-dimensional geographic information system GIS accordingly. Obtain the obstacle assessment reference height three-dimensional surface according to methods S1 to S3. Evaluate the target obstacle based on the obstacle assessment reference height three-dimensional surface. If part of the target obstacle is located on the obstacle assessment reference height three-dimensional surface and the height of the target obstacle (i.e., the horizontal position of the target obstacle) (the actual height of the target obstacle or the planned height) is higher than the height of the corresponding position of the obstacle assessment reference height three-dimensional surface (i.e., the horizontal position of the target obstacle) (the height on the elevation of the corresponding position of the obstacle assessment reference height three-dimensional surface), then the target obstacle is a target obstacle that needs to be rectified and an early warning is output. Perform a restricted height assessment operation and numerical comparison on the target obstacles within the area according to the obstacle assessment reference height three-dimensional surface. When the height of the target obstacle is higher than the restricted value, it indicates that the target obstacle has affected the safety of the airport and effective measures need to be taken to rectify it. The airport clearance obstacle assessment reference height three-dimensional surface construction assessment method of the present invention was tried out at an airport in Lincang City, Yunnan Province. An example of target obstacle assessment and early warning was given. Figure 8 As shown, it is possible to effectively evaluate and warn target obstacles. The method for constructing a three-dimensional reference height surface for evaluating airport clearance obstacles was tested at an airport in Beijing. For example, target obstacle evaluation and warning were performed. Figure 9 As shown, it is possible to effectively evaluate and warn of target obstacles.

[0059] A system for constructing a three-dimensional reference height surface for airport clearance obstacle assessment includes a three-dimensional geographic information system (GIS), a clearance restriction area parameter table, a clearance graphic element spatial computation model, and a Cesium library model. The GIS internally constructs a plane coordinate system. Runway data for the study airport is acquired and projected onto the plane coordinate system using the NTS library. The clearance restriction area parameter table includes runway obstacle restriction parameters, runway takeoff and landing area obstacle restriction parameters, and surrounding clearance restriction parameters. The clearance restriction area parameter table is projected onto the plane coordinate system using the NTS library. The clearance graphic element spatial computation model demarcates the plane coordinate system from the center of the runway outward into the seventh restriction area, the runway obstacle restriction surface area, the sixth restriction area, the fifth restriction area, the fourth restriction area, the third restriction area, the second restriction area, and the first restriction area. The Cesium library model sets the corresponding height restriction parameters for the seventh restriction area, the runway obstacle restriction surface area, the sixth restriction area, the fifth restriction area, the fourth restriction area, the third restriction area, the second restriction area, and the first restriction area, respectively. The Cesium library model constructs the corresponding obstacle assessment reference height three-dimensional surfaces on the three-dimensional geographic information system (GIS) according to the height restriction parameters corresponding to the seventh restricted area, runway obstacle limitation surface area, sixth restricted area, fifth restricted area, fourth restricted area, third restricted area, second restricted area and first restricted area.

[0060] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A method for constructing a three-dimensional surface for evaluating airport clearance obstacles, characterized by: The methods include: S1. Construct a plane coordinate system on a 3D geographic information system (GIS), obtain runway data for the study airport, and project it onto the plane coordinate system using the NTS library. Construct a clearance restriction zone parameter table, which includes runway obstacle restriction parameters, runway takeoff and landing area obstacle restriction parameters, and surrounding clearance restriction parameters. Project the clearance restriction zone parameter table onto the plane coordinate system using the NTS library. S2. In a plane coordinate system, based on the clearance graphic element spatial computation model, the seventh restricted area, the runway obstacle limitation surface area, the sixth restricted area, the fifth restricted area, the fourth restricted area, the third restricted area, the second restricted area, and the first restricted area are successively divided outward from the center of the runway. The graphic elements and spatial structure of the clearance graphic element spatial computation model are as follows: The graphic element of the seventh restricted area is a rectangular graphic around the runway centerline; The runway obstacle limitation surface is located outside the seventh restricted area and is designated to meet the requirements of aircraft flight procedures and research airport clearance. The image element of the sixth restricted area is a rectangular figure located outside the runway obstacle limitation surface area and does not include the runway obstacle limitation surface; The image element of the fifth restricted area is a rectangular figure connected to the sixth restricted area and does not include the runway obstacle limitation surface; The image element of the fourth restricted area is a rectangular area extending perpendicular to the runway centerline outside the sixth and fifth restricted areas and excluding the sixth and fifth restricted areas; The image elements of the third restricted area are two rectangular areas connected to the fourth restricted area and extending to both ends of the runway centerline; The graphic element of the second restricted area is the circular area outside the third restricted area and does not include the third restricted area; The graphic element of the first restricted area is the area outside the circle of the second restricted area and does not include the second restricted area; The seventh restricted area, the runway obstacle limitation surface area, the sixth restricted area, the fifth restricted area, the fourth restricted area, the third restricted area, the second restricted area and the first restricted area are constructed in sequence and continuously without any intersection or overlap; S3. Set the height restriction parameters corresponding to the seventh restricted area, the runway obstacle limitation surface area, the sixth restricted area, the fifth restricted area, the fourth restricted area, the third restricted area, the second restricted area, and the first restricted area, respectively. Use the Cesium library model to construct corresponding obstacle assessment reference height three-dimensional surfaces on the three-dimensional geographic information system (GIS) according to the height restriction parameters corresponding to the seventh restricted area, the runway obstacle limitation surface area, the sixth restricted area, the fifth restricted area, the fourth restricted area, the third restricted area, the second restricted area, and the first restricted area.

2. The method for constructing a three-dimensional reference height surface for airport clearance obstacle assessment according to claim 1, characterized in that: In the clearance restricted area parameter table, the runway obstacle limitation parameters correspond to the seventh restricted area and the runway obstacle limitation surface area; in the clearance restricted area parameter table, the runway take-off and landing area obstacle limitation parameters correspond to the fourth restricted area, the third restricted area, and the second restricted area; and in the clearance restricted area parameter table, the surrounding clearance limitation parameters correspond to the first restricted area.

3. The method for constructing a three-dimensional reference height surface for airport clearance obstacle assessment according to claim 1, characterized in that: The clearance graphic element spatial calculation model adjusts the size of the seventh restricted area and the runway obstacle limitation surface area according to the set parameters in the runway obstacle limitation parameters; the clearance graphic element spatial calculation model adjusts the size of the fourth restricted area, the third restricted area, and the second restricted area according to the set parameters in the runway take-off and landing area obstacle limitation parameters; and the clearance graphic element spatial calculation model adjusts the size of the first restricted area according to the set parameters in the surrounding clearance limitation parameters.

4. The method for constructing a three-dimensional reference height surface for airport clearance obstacle assessment according to claim 1, characterized in that: The seventh restricted area is a rectangular area extending outward from both ends of the runway centerline by A1 and extending on both sides of the runway centerline in a perpendicular direction by A2; the setting parameters in the runway obstacle limitation parameters include parameters A1 and A2.

5. The method for constructing a three-dimensional reference height surface for airport clearance obstacle assessment according to claim 1, characterized in that: The runway obstacle limitation parameters include a runway takeoff climb offset angle, and the height limitation parameters corresponding to the runway obstacle limitation surface area are constructed based on the nominal track angle of the aircraft flight procedure and the runway takeoff climb offset angle for slope height.

6. The method for constructing a three-dimensional reference height surface for airport clearance obstacle assessment according to claim 1, characterized in that: Also includes the following methods: S4. Construct an existing or planned target obstacle and construct it in the three-dimensional geographic information system (GIS). Obtain a three-dimensional reference height surface for obstacle assessment according to methods S1 to S3, and assess the target obstacle based on the three-dimensional reference height surface. If part of the target obstacle is located on the three-dimensional reference height surface and the height of the target obstacle is higher than the height of the corresponding position on the three-dimensional reference height surface, the target obstacle is a target obstacle that needs to be rectified, and an early warning is output.

7. A system for constructing a three-dimensional surface at a reference height for evaluating airport clearance obstacles, which implements the method for constructing a three-dimensional surface at a reference height for evaluating airport clearance obstacles as described in claim 1, characterized in that: It includes a three-dimensional geographic information system GIS, a clearance restriction zone parameter table, a clearance graphic element spatial operation model and a Cesium library model. A plane coordinate system is constructed inside the three-dimensional geographic information system GIS, and the runway data of the research airport is obtained and projected onto the plane coordinate system using the NTS library; the clearance restriction zone parameter table includes runway obstacle restriction parameters, runway take-off and landing area obstacle restriction parameters and surrounding clearance restriction parameters, and the clearance restriction zone parameter table is projected onto the plane coordinate system using the NTS library; the clearance graphic element spatial operation model divides the seventh restriction zone, the runway obstacle restriction surface ... The sixth restricted area, the fifth restricted area, the fourth restricted area, the third restricted area, the second restricted area and the first restricted area; the Cesium library model sets the height restriction parameters corresponding to the seventh restricted area, the runway obstacle limitation surface area, the sixth restricted area, the fifth restricted area, the fourth restricted area, the third restricted area, the second restricted area and the first restricted area respectively; the Cesium library model constructs the corresponding obstacle assessment reference height three-dimensional surfaces on the three-dimensional geographic information system GIS according to the height restriction parameters corresponding to the seventh restricted area, the runway obstacle limitation surface area, the sixth restricted area, the fifth restricted area, the fourth restricted area, the third restricted area, the second restricted area and the first restricted area.

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