Airport clearance obstacle assessment reference height three-dimensional surface construction assessment method and system

Abstract

The invention discloses an airport clearance obstacle assessment reference height three-dimensional surface construction assessment method and system, and the method comprises the steps: S1, constructing a plane-coordinate system on a three-dimensional geographic information system GIS, obtaining runway data of a research airport, and projecting the runway data to the plane-coordinate system through an NTS class library, projecting the clearance confinement zone parameter table to a plane coordinate system by adopting an NTS class library; s2, on the basis of a clearance graph element space operation model, successively dividing each restricted area from the runway center to the outside in a plane-coordinate system; and S3, setting a height limitation parameter corresponding to each limitation area, and constructing a corresponding obstacle evaluation reference height three-dimensional surface on a three-dimensional geographic information system GIS according to the height limitation parameter of each limitation area by using the Cesium library model. According to the invention, the clearance graph element space operation model correspondingly constructs each restricted area based on the clearance restricted area parameter table and constructs the obstacle assessment reference height three-dimensional surface by using the Cesium library model, so that the target obstacle assessment can be quickly and accurately realized.

Description

Technical Field

[0001] The present invention relates to the field of airport clearance obstacle assessment, and particularly to a method and system for constructing and evaluating a three-dimensional surface of the reference height for airport clearance obstacle assessment. Background Art

[0002] The airport clearance area refers to a restricted space area for clearance obstacles demarcated around the airport to ensure the safety of aircraft takeoff, landing, and go-around. The quality of the clearance conditions is directly related to flight safety. The existence of ultra-high obstacles (such as buildings, mountains, communication towers, etc.) in the airport clearance area will seriously affect the takeoff and landing of aircraft and may even lead to flight accidents; therefore, the assessment of clearance obstacles is an important part of ensuring flight safety. According to relevant regulations, the airport clearance reference height consists of elements such as the clearance reference height of the obstacle restriction surface area, the clearance reference height of the flight procedure, and the minimum surveillance guidance clearance reference height. In the horizontal projection overlapping area within the flight procedure area, the clearance reference height takes the lower value of the minimum surveillance guidance clearance reference height and the clearance reference height of the flight procedure.

[0003] With the acceleration of the urbanization process, many airports originally located in the suburbs have been surrounded by the city. Buildings are continuously added in the airport area or the heights of surrounding buildings are continuously increased, and the clearance environment is becoming increasingly complex. In this case, the assessment of airport clearance obstacles not only needs to consider flight safety but also takes into account urban planning and economic development to achieve the coordinated development of the airport and the city. The assessment of clearance obstacles is an important part of airport clearance risk management; by identifying, analyzing, and evaluating the obstacles in the clearance area, it provides a decision-making basis for airport safety management. The assessment of the reference height surface of clearance is an important link in airport clearance risk management; through scientific assessment, it can evaluate the impact of obstacles on aircraft flight, thus providing a decision-making basis for airport safety management. For example, within the airport obstacle restriction area, the obstacle height limit shall not be relaxed by adjusting the flight procedure and the minimum airport operating standards; in addition, a clearance review must be carried out for construction projects that may affect aircraft flight. With the development of three-dimensional visualization technology and digital management technology, the efficiency and accuracy of the assessment of the reference height surface of clearance have been significantly improved; however, the current assessment of target obstacles mainly relies on the manual calculation management mode, which has problems such as low management efficiency and complicated data, and is not conducive to the rapid decision-making of target obstacles. Summary of the Invention

[0004] The object of the present invention is to solve the technical problems pointed out in the background art, and to provide an evaluation method and system for constructing a three-dimensional surface of the reference height of airport clearance obstacles. By means of a spatial operation model of clearance graphic elements, each restricted area is successively delimited outward with the runway center as the reference. Based on the parameter data in the clearance restricted area parameter table, each restricted area is constructed in the three-dimensional geographic information system (GIS) corresponding to the research area. By setting the height limit parameters of each restricted area and using the Cesium library model to construct the corresponding three-dimensional surface of the reference height of obstacle evaluation, an effective construction of the three-dimensional surface of the reference height of obstacle evaluation for clearance obstacle protection is realized, and the risk assessment of existing and planned target obstacles can be scientifically, quickly and accurately realized.

[0005] The object of the present invention is achieved by the following technical solutions:

[0006] An evaluation method for constructing a three-dimensional surface of the reference height of airport clearance obstacles, the method comprising:

[0007] S1. Construct a plane coordinate system on the three-dimensional geographic information system (GIS), obtain the runway data of the research airport and project it onto the plane coordinate system by using the NTS class library; construct a clearance restricted area parameter table, the clearance restricted area parameter table includes runway obstacle restriction parameters, runway takeoff and landing area obstacle restriction parameters and surrounding clearance restriction parameters, and project the clearance restricted area parameter table onto the plane coordinate system by using the NTS class library;

[0008] S2. Based on the spatial operation model of clearance graphic elements in the plane coordinate system, successively divide 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 outward from the runway center;

[0009] S3. Set the height limit parameters corresponding to 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 respectively, and use the Cesium library model to construct the corresponding three-dimensional surface of the reference height of obstacle evaluation on the three-dimensional geographic information system (GIS) according to the height limit parameters corresponding to 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 respectively.

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

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

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

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

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

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

[0016] The graphic element of the fourth restricted area is a rectangle extending vertically along the runway center line outside the sixth restricted area and the fifth restricted area and does not include the sixth restricted area and the fifth restricted area;

[0017] The graphic elements of the third restricted area are two rectangular areas connected to the fourth restricted area and extending towards both ends of the runway center line;

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

[0020] The seventh restricted area, the runway obstacle restricted 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 continuously constructed in sequence and do not cross or overlap.

[0021] Preferably, the clearance graphic element spatial operation model adjusts the sizes of the seventh restricted area and the runway obstacle restricted surface area respectively according to the set parameters in the runway obstacle restriction parameters; the clearance graphic element spatial operation model adjusts the sizes of the fourth restricted area, the third restricted area and the second restricted area respectively according to the set parameters in the runway takeoff and landing area obstacle restriction parameters; the clearance graphic element spatial operation model adjusts the size of the first restricted area according to the set parameters in the surrounding clearance restriction parameters.

[0022] Preferably, the seventh restricted area is a rectangular area enclosed by extending A1 outward at both ends of the runway along the runway center line and extending A2 on both sides in the direction perpendicular to the runway center line; the set parameters in the runway obstacle restriction parameters include the A1 and A2 parameters.

[0023] Preferably, 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 are constructed based on the nominal track angle of the aircraft flight procedure and the runway takeoff climb offset angle for the slope height.

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

[0025] S4. Construct the existing or planned target obstacles and correspondingly construct them in the three-dimensional geographic information system GIS. Obtain the three-dimensional surface of the obstacle evaluation reference height according to methods S1 to S3, and evaluate the target obstacles based on the three-dimensional surface of the obstacle evaluation reference height. If part of the target obstacle is located on the three-dimensional surface of the obstacle evaluation reference height and the height of the target obstacle is higher than the height corresponding to the position on the three-dimensional surface of the obstacle evaluation reference height, then the target obstacle is the target obstacle to be rectified and a warning is output.

[0026] A three-dimensional surface construction and evaluation system for the obstacle evaluation reference height of airport clearance includes a three-dimensional geographic information system GIS, a clearance restriction area 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 area parameter table includes runway obstacle restriction parameters, runway takeoff and landing area obstacle restriction parameters, and surrounding clearance restriction parameters, and the clearance restriction area parameter table is projected onto the plane coordinate system using the NTS library; the clearance graphic element spatial operation model successively divides 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 from the runway center outward in the plane coordinate system; the height restriction parameters corresponding to 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 are set in the Cesium library model; the Cesium library model constructs the corresponding three-dimensional surfaces of the obstacle evaluation reference height on the three-dimensional geographic information system GIS according to the height restriction parameters corresponding to 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.

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

[0028] (1) The present invention successively delimits each restricted area outward with the runway center as the benchmark through the clearance graphic element spatial operation model, constructs each restricted area in the three-dimensional geographic information system GIS corresponding to the research area based on the parameter data in the clearance restricted area parameter table, and constructs the three-dimensional surface of the reference height for obstacle assessment corresponding to each restricted area by setting the height limit parameters of each restricted area and using the Cesium library model, realizing the effective construction of the three-dimensional surface of the reference height for obstacle assessment in clearance obstacle protection, and being able to scientifically, quickly, and accurately conduct the risk assessment of existing and planned target obstacles.

[0029] (2) The present invention greatly improves the efficiency of clearance management and simplifies the clearance obstacle approval process, not only enhancing the safety management level of the airport, but also promoting the coordinated development of the airport and local economy; by optimizing the approval process and providing data support, it provides strong technical support for building planning, airport reconstruction and expansion, etc.

[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, accurate, and high safety in assessment. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 is the method flow chart of the method for constructing and evaluating the three-dimensional surface of the reference height for airport clearance obstacle assessment of the present invention;

[0032] Figure 2 is the schematic diagram of the parameter setting related to the first restricted area in the clearance restricted area parameter table in the embodiment;

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

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

[0035] Figure 5 is Figure 4 the schematic diagram of the principle of dividing and constructing the seventh restricted area according to the example parameters in

[0036] Figure 6 is Figure 4 the schematic diagram of the principle of dividing and constructing the runway obstacle restricted surface area according to the example parameters in

[0037] Figure 7 is the effect diagram of dividing each restricted area at an airport based on the clearance graphic element spatial operation model;

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

[0039] Figure 9 This is a schematic diagram of the trial application of the method of the present invention at an airport in Beijing and the target obstacle assessment and warning using the three-dimensional surface of the obstacle assessment reference height. Specific implementation manners

[0040] The present invention will be further described in detail below in conjunction with embodiments:

[0041] Embodiment

[0042] As Figure 1 shown, a three-dimensional surface construction and assessment method for the reference height of airport clearance obstacles, the method includes:

[0043] S1. Construct a plane coordinate system on a three-dimensional geographic information system (GIS), obtain the runway data of the research airport and project it onto the plane coordinate system using the NTS library. Construct a clearance restricted area parameter table, which includes runway obstacle restriction parameters, runway takeoff and landing area obstacle restriction parameters, and surrounding clearance restriction parameters, and project the clearance restricted area parameter table onto the plane coordinate system using the NTS library. There are several parameter input items set in the clearance restricted area parameter table. Corresponding input parameters are based on the requirements of the research airport for clearance obstacles (including general requirements, special requirements, or / and manually set requirements. Examples of special requirements are high plateau airports or wind shear at high plateau airports, etc. Examples of manually set requirements include settings for specific safety considerations or safety settings higher than regulatory requirements). The runway obstacle restriction parameters, runway takeoff 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 are correspondingly associated with the seventh restricted area and the runway obstacle restriction surface area. The runway takeoff and landing area obstacle restriction parameters in the clearance restricted area parameter table are correspondingly associated with the fourth restricted area, the third restricted area, and the second restricted area. The surrounding clearance restriction parameters in the clearance restricted area parameter table are correspondingly associated with the first restricted area. As Figure 2 shown, the parameter setting schematic of the surrounding clearance restriction parameters in the clearance restricted area parameter table associated with the first restricted area. 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. As Figure 3As shown, for example, the main parameter diagrams of the clearance limit area parameter table in the first to seventh limit areas, and the main parameter setting examples of the clearance limit area parameter table associated with the first to seventh limit areas (the seventh limit area, the runway obstacle limitation surface area, the sixth limit area, the fifth limit area, the fourth limit area, the third limit area, the second limit area, and the first limit area) ( Figure 3 For illustration purposes only, the specific parameter data is blurred. The specific data is not suitable for disclosure and does not affect the understanding of the technology).

[0044] S2. Based on the clearance graphic element space operation model in the plane coordinate system, the seventh limit area, the runway obstacle limitation surface area, the sixth limit area, the fifth limit area, the fourth limit area, the third limit area, the second limit area, and the first limit area are successively divided outwards from the runway center. The seventh limit area, the runway obstacle limitation surface area, the sixth limit area, the fifth limit area, the fourth limit area, the third limit area, the second limit area, and the first limit area are respectively used as the graphic elements of the clearance graphic element space operation model and have a definite spatial structure. The clearance graphic element space operation model is constructed according to all the graphic elements (specifically, the seventh limit area, the runway obstacle limitation surface area, the sixth limit area, the fifth limit area, the fourth limit area, the third limit area, the second limit area, and the first limit area) and the spatial structure and is applicable to the adjustment of the parameters in the clearance limit area parameters.

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

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

[0047] The runway obstacle limitation surface area is the runway obstacle limitation surface delimited outside the seventh limit area to meet the aircraft flight procedures and the requirements of the airport clearance study.

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

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

[0050] The graphic element of the fourth limit area is a rectangle extending vertically along the runway center line outside the sixth limit area and the fifth limit area and does not include the areas of the sixth limit area and the fifth limit area.

[0051] The graphic elements of the third limit area are two rectangular areas connected to the fourth limit area and extending towards both ends of the runway center line.

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

[0053] The graphic element of the first restricted area is the area outside the second restricted area's outer circle and does not include the second restricted area; in actual use, according to the research on airport safety, the first restricted area may not exist.

[0054] The spatial structure relationship restriction conditions of each restricted area are: the seventh restricted area, the runway obstacle restricted 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 continuously constructed in sequence and do not cross or overlap.

[0055] In some embodiments, in Figure 4 , according to the runway direction, the left side is area A (if there are two left and right areas in the restricted area, the area A and area B below the restricted area are further divided respectively. If more in-depth parameter settings for area A and area B are required, that is, for applications applicable to special requirements or / and artificial setting requirements, the parameters can be set correspondingly), and the right side is area B; with the runway as the reference, area A is the 180-degree to 360-degree area on the left side, and the remaining is area B; if the runway direction is due south or due north, the upper part is area A and the lower part is area B.

[0056] S3. The airspace graphic element spatial operation model adjusts the sizes of the seventh restricted area and the runway obstacle restricted surface area respectively according to the set parameters in the runway obstacle restricted parameters. The seventh restricted area is a rectangular area formed by extending A1 outward at both ends of the runway centerline and extending A2 on both sides in the direction perpendicular to the runway centerline; the set parameters in the runway obstacle restricted parameters include A1 and A2 parameters. If the A1 and A2 parameters are 4 km and 1.5 km respectively, the size adjustment of the seventh restricted area is as Figure 5 shown. Figure 6 There are parameters corresponding to the runway obstacle restricted surface area, and based on the parameters, the Figure 6 shown runway obstacle restricted surface area is constructed. The airspace graphic element spatial operation model adjusts the sizes of the fourth restricted area, the third restricted area, and the second restricted area respectively according to the set parameters in the runway takeoff and landing area obstacle restricted parameters. The airspace graphic element spatial operation model adjusts the size of the first restricted area according to the set parameters in the surrounding airspace restricted parameters.

[0057] Set the height limit parameters corresponding to the seventh restricted area, runway obstacle restricted surface area, sixth restricted area, fifth restricted area, fourth restricted area, third restricted area, second restricted area, and first restricted area respectively. Use the Cesium library model to construct the corresponding three-dimensional surfaces of the reference heights for obstacle assessment on the three-dimensional geographic information system (GIS) according to the height limit parameters corresponding to the seventh restricted area, runway obstacle restricted surface area, sixth restricted area, fifth restricted area, fourth restricted area, third restricted area, second restricted area, and first restricted area. As Figure 7 shown, based on the spatial operation model of clearance graphic elements, each restricted area is demarcated at an airport and the three-dimensional surfaces of the reference heights for obstacle assessment are constructed. The effect is as Figure 7 shown. Figure 7 In the actual software, it is a three-dimensional effect. To better display the effects of the seventh restricted area, runway obstacle restricted surface area, sixth restricted area, fifth restricted area, fourth restricted area, third restricted area, second restricted area, and first restricted area, a cross-section is used for display.

[0058] S4. Construct the existing or planned target obstacles and correspondingly construct them in the three-dimensional geographic information system (GIS). Obtain the three-dimensional surface of the reference height for obstacle assessment according to methods S1 to S3, and based on the three-dimensional surface of the reference height for obstacle assessment, evaluate the target obstacles. If part of the target obstacle is located on the three-dimensional surface of the reference height for obstacle assessment and the height of the target obstacle (i.e., the actual height or planned height of the target obstacle at the horizontal position where the target obstacle is located) is higher than the height at the corresponding position of the three-dimensional surface of the reference height for obstacle assessment (i.e., the height at the elevation of the corresponding position of the three-dimensional surface of the reference height for obstacle assessment at the horizontal position where the target obstacle is located), then the target obstacle is a target obstacle that needs to be rectified and a warning is output. According to the three-dimensional surface of the reference height for obstacle assessment, perform a restricted height assessment operation and numerical comparison on the target obstacles within the scope of the area. When the height of the target obstacle is higher than the restricted value, it indicates that the target obstacle has an impact on the safety of the airport and effective measures need to be taken for rectification. The method for constructing and assessing the three-dimensional surface of the reference height for airport clearance obstacles of the present invention is tried out at an airport in Lincang City, Yunnan Province, and an example is given for target obstacle assessment and warning. As Figure 8 shown, it can effectively perform the assessment and warning processing of target obstacles. The method for constructing and assessing the three-dimensional surface of the reference height for airport clearance obstacles of the present invention is tried out at an airport in Beijing, and an example is given for target obstacle assessment and warning. As Figure 9 shown, it can effectively perform the assessment and warning processing of target obstacles.

[0059] An evaluation system for constructing a three-dimensional surface of the reference height of airport clearance obstacles includes a three-dimensional geographic information system (GIS), a table of clearance restriction area parameters, a spatial operation model for clearance graphic elements, and a Cesium library model. A plane coordinate system is built 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 table of clearance restriction area parameters includes runway obstacle restriction parameters, runway takeoff and landing area obstacle restriction parameters, and surrounding clearance restriction parameters, and the table of clearance restriction area parameters is projected onto the plane coordinate system using the NTS library. The spatial operation model for clearance graphic elements successively divides 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 from the runway center outward in the plane coordinate system. The height restriction parameters corresponding to 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 are set in the Cesium library model. The Cesium library model constructs corresponding three-dimensional surfaces of the reference height of obstacles on the three-dimensional geographic information system (GIS) according to the height restriction parameters corresponding to 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.

[0060] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A method for constructing a three-dimensional surface for evaluating airport clearance obstacle assessment reference height, characterized in that: The methods include: S1. Construct a plane coordinate system on the three-dimensional geographic information system GIS, obtain the runway data of the research airport and project it onto the plane coordinate system using the NTS class library; construct a clearance restricted area parameter table, which includes runway obstacle restriction parameters, runway take-off and landing area obstacle restriction parameters and surrounding clearance restriction parameters, and project the clearance restricted area parameter table onto the plane coordinate system using the NTS class library; S2. In the plane coordinate system, based on the clearance graphic element spatial calculation 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 divided from the center of the runway outward; S3. Set the height restriction parameters corresponding to 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 respectively, and use the Cesium library model to construct 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 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.

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

3. The method for constructing a three-dimensional surface for evaluating reference height of airport clearance obstacles according to claim 1, characterized in that: The graphic elements and spatial structure of the clearance graphic element spatial operation model are as follows: The graphic element of the seventh restricted area is a rectangular graphic around the center line of the runway; The runway obstacle limitation surface area is located outside the seventh restricted area and is set up to meet the aircraft flight procedures and research airport clearance requirements. 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 area; 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 perpendicularly to the centerline of the runway outside the sixth restricted area and the fifth restricted area and excluding the sixth restricted area and the fifth restricted area; The image element of the third restricted area is 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 area outside the third restricted area and not including the third restricted area; The graphic element of the first restricted area is a circular area outside 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 crossing or overlapping.

4. The method for constructing a three-dimensional surface for evaluating reference height of airport clearance obstacles according to claim 3 is characterized in that: 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; 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.

5. The method for constructing a three-dimensional surface for evaluating reference height of airport clearance obstacles according to claim 3, characterized in that: 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 vertical direction; the setting parameters in the runway obstacle limitation parameters include A1 and A2 parameters.

6. The method for constructing a three-dimensional surface for evaluating reference height of airport clearance obstacles according to claim 3, 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 construction.

7. The method for constructing a reference height three-dimensional surface for evaluating airport clearance obstacles 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 accordingly. Obtain the obstacle assessment reference height three-dimensional surface according to methods S1 to S3, and 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 is higher than the height of the corresponding position of the obstacle assessment reference height three-dimensional surface, the target obstacle is a target obstacle that needs to be rectified and an early warning is output.

8. A three-dimensional surface construction evaluation system for airport clearance obstacle evaluation reference height, characterized in that: It includes a three-dimensional geographic information system GIS, a clearance restricted area 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 class library; the clearance restricted area parameter table includes runway obstacle restriction parameters, runway take-off and landing area obstacle restriction parameters and surrounding clearance restriction parameters, and the clearance restricted area parameter table is projected onto the plane coordinate system using the NTS class library; the clearance graphic element spatial operation model divides the seventh restriction area, the runway obstacle restriction surface area, and the runway obstacle restriction surface area from the center of the runway to the outside in the plane coordinate system. 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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