Ecological bird island evaluation method and device based on centroid coincidence

Abstract

The present invention provides an ecological bird island evaluation method and device based on centroid coincidence, wherein the method includes: remote sensing extraction of the enclosure group in the transformation area through remote sensing extraction technology, converting the enclosure group into a polygon containing a specific number of basic figures, and obtaining the centroid of the enclosure group in the transformation area and the radius of the circumscribed circle of the enclosure group by processing the polygon; obtaining the location of the ecological bird island group and the earthwork volume of the transformation enclosure; determining the number and shape parameters of the bird island group according to the bird island slope ratio and the top radius of the bird island; obtaining the design scheme of the bird island group according to the location of the ecological bird island group, the number of the bird island group and the shape parameters, and calculating the centroid distance between the centroid of the bird island group in the bird island group design scheme and the centroid of the enclosure group; evaluating the design scheme of the ecological bird island group through the centroid distance and the circumscribed circle radius of the enclosure group to obtain the evaluation result. So as to reduce the earthwork transportation volume of constructing ecological bird islands in shallow wetlands.

Description

Technical Field

[0001] This document relates to the technical field of embankment reconstruction, and in particular to an ecological bird island evaluation method and device based on centroid coincidence. Background Art

[0002] With the development of social economy and the intensification of human production activities, lake wetlands are facing many threats such as serious eutrophication of water bodies, shrinking area, habitat fragmentation and biodiversity decline. Dikes and embankments are the crystallization of the wisdom of the working people in my country. People build dikes and embankments by digging silt from the bottom of the lake to carry out economic activities such as aquaculture and crop planting, thereby increasing industrial income. However, the large-scale construction of dikes and embankments has encroached on wetland space, hindered the connectivity of water bodies, and caused habitat fragmentation; on the other hand, when the water level fluctuates, the nearly vertical dikes and embankment revetments cannot form diversified habitats with different water depths. The habitat type is relatively single, and the ecosystem stability is insufficient, which further affects the maintenance of biodiversity. At present, there are different research plans for the transformation of dikes and embankments in lake wetlands, but engineering construction generally pursues the minimum engineering volume, the minimum disturbance and the best economy, and its core is to minimize the amount of earthwork moved in the restoration project. Removing embankments and building bird islands are important means of ecological restoration. At the same time, taking soil from the site and piling it up to construct habitats are common ecological restoration engineering methods. However, there is a lack of corresponding design methods and standards. Summary of the invention

[0003] The present invention provides an ecological bird island evaluation method and device based on centroid coincidence, aiming to solve the above problems.

[0004] One or more embodiments of this specification provide an ecological bird island evaluation method based on centroid coincidence, including:

[0005] S1. Perform remote sensing extraction on the embankment group in the area to be transformed by remote sensing extraction technology, convert the embankment group into a polygon containing a specific number of basic figures, and obtain the centroid of the embankment group in the area to be transformed and the radius of the circumscribed circle of the embankment group by processing the polygon;

[0006] S2. Obtain the intersection position of the embankment, and use the intersection position of the embankment as the position for constructing the ecological bird island group;

[0007] S3, calculating the earthwork volume of the embankment according to the area of ​​the embankment and the average height of the embankment, and using the earthwork volume of the embankment as the earthwork volume of the embankment reconstruction;

[0008] S4. Determine the slope ratio of the bird island according to the underwater repose angle of the soil type, set the top radius of the bird island according to the average width of the enclosure, and determine the number and shape parameters of the bird island group according to the slope ratio of the bird island and the top radius of the bird island;

[0009] S5, obtaining the centroid of the bird island group, obtaining the design scheme of the bird island group according to the location of the ecological bird island group, the number of the bird island group and the shape parameters, and calculating the centroid distance between the centroid of the bird island group and the centroid of the embankment group in the bird island group design scheme;

[0010] S6. Evaluate the design scheme of the ecological bird island group by the centroid distance and the radius of the circumscribed circle of the enclosure group to obtain the evaluation result.

[0011] One or more embodiments of this specification provide an ecological bird island evaluation device based on centroid coincidence, including:

[0012] The centroid and circumscribed circle acquisition module is used to perform remote sensing extraction on the embankment group in the area to be transformed through remote sensing extraction technology, convert the embankment group into a polygon containing a specific number of basic graphics, and obtain the centroid of the embankment group in the area to be transformed and the circumscribed circle radius of the embankment group by processing the polygon;

[0013] The bird island group location acquisition module is used to acquire the intersection location of the enclosure and use the intersection location of the enclosure as the location for constructing the ecological bird island group;

[0014] The earthwork volume module is used to calculate the earthwork volume of the embankment according to the embankment area and the average height of the embankment, and use the earthwork volume of the embankment as the earthwork volume of the embankment reconstruction;

[0015] The bird island group quantity and parameter module is used to determine the bird island slope ratio according to the underwater repose angle of the soil type, set the bird island top radius according to the average width of the enclosure, and determine the number and shape parameters of the bird island group according to the bird island slope ratio and the bird island top radius;

[0016] The bird island group centroid acquisition module is used to obtain the centroid of the bird island group, obtain the design scheme of the bird island group according to the location, number and shape parameters of the ecological bird island group, and calculate the centroid distance between the bird island group centroid and the embankment group centroid in the bird island group design scheme;

[0017] The evaluation module is used to evaluate the design scheme of the ecological bird island group through the centroid distance and the radius of the circumscribed circle of the enclosure group to obtain the evaluation result.

[0018] According to an embodiment of the present invention, images of the embankment group in the area to be transformed are obtained through remote sensing technology and processed into a polygonal structure composed of multiple basic figures. The centroid of the embankment group and the radius of the circumscribed circle of the embankment group are obtained according to the polygonal structure. The ecological bird island transformation plan is designed according to the inflection point of the embankment group, the amount of earthwork and the average width of the embankment group. The centroid distance between the centroid of the bird island group and the centroid of the embankment group in the bird island group design plan is calculated. The design plan of the ecological bird island group is evaluated by calculating the ratio of the centroid distance to the radius of the circumscribed circle of the embankment group. The embodiment of the present invention reduces the amount of earthwork movement in the embankment transformation project by controlling the ratio of the centroid distance to the radius of the circumscribed circle of the embankment group. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate one or more embodiments of this specification or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this specification. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0020] Figure 1 It is a flow chart of an ecological bird island evaluation method based on centroid coincidence according to an embodiment of the present invention;

[0021] Figure 2 It is a structural schematic diagram of an ecological bird island evaluation device based on centroid coincidence according to an embodiment of the present invention. DETAILED DESCRIPTION

[0022] In order to enable those skilled in the art to better understand the technical solutions in one or more embodiments of this specification, the following will be combined with the drawings in one or more embodiments of this specification to clearly and completely describe the technical solutions in one or more embodiments of this specification. Obviously, the described embodiments are only part of the embodiments of this specification, not all of the embodiments. Based on one or more embodiments of this specification, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of this document.

[0023] Method Embodiment

[0024] According to an embodiment of the present invention, a method for evaluating an ecological bird island based on centroid coincidence is provided. Figure 1 : is a flow chart of an ecological bird island evaluation method based on centroid coincidence according to an embodiment of the present invention. Figure 1 As shown, the ecological bird island evaluation method based on centroid coincidence according to an embodiment of the present invention specifically includes:

[0025] Step S101: remote sensing extraction is performed on the embankment group in the area to be transformed by remote sensing extraction technology, and the embankment group is converted into a polygon containing a specific number of basic graphics, and the center of mass of the embankment group in the area to be transformed and the radius of the circumscribed circle of the embankment group are obtained by processing the polygon. Step S101 specifically includes:

[0026] The centroid coordinates (x c ,y c , z c ):

[0027]

[0028]

[0029]

[0030] Among them, A i is the area of ​​each basic figure, x i ,y i 、z i are the X, Y, and Z coordinates of the centroid of each primitive shape.

[0031] Getting the radius of the circumscribed circle includes:

[0032] Get the major axis L of the polygon, and make a minimum circumscribed circle O with the midpoint of the major axis as the center and the length of the major axis L as the diameter, or calculate the distance from each vertex of the polygon to the center of the major axis, and make a triangle ABC with the farthest point and the two end points of the major axis to get the minimum circumscribed circle O of triangle ABC;

[0033] Calculate the distance from each vertex of the polygon to the minimum circumscribed circle O, and obtain the maximum distance. The vertex with the maximum distance is recorded as P. The maximum distance is compared with the radius of the minimum circumscribed circle O. If the maximum distance is less than the radius of the minimum circumscribed circle O, the minimum circumscribed circle is the minimum circumscribed circle of the polygon. If the maximum distance is greater than the radius of the minimum circumscribed circle O, calculate the distance between P and the three vertices of triangle ABC, replace the point closest to it with point P to make a new triangle, and calculate the minimum circumscribed circle of the new triangle until the maximum value is less than the radius of the minimum circumscribed circle O.

[0034] Step S102: obtaining the intersection positions of the embankments, and using the intersection positions of the embankments as the positions for constructing the ecological bird island group;

[0035] Step S103, calculating the earthwork volume of the embankment according to the area of ​​the embankment and the average height of the embankment, and using the earthwork volume of the embankment as the earthwork volume of the embankment reconstruction. Step S103 specifically includes:

[0036] The earthwork volume of the embankment is calculated by formula 4:

[0037] Q=S 围 ×(h 顶 -h 底 ) Formula 4;

[0038] Among them, Q represents the available earthwork volume, S 围 represents the area of ​​the enclosure, h 顶 represents the average top elevation of the embankment, h 底 Indicates the average bottom elevation of the embankment.

[0039] Step S104, determining the bird island slope ratio according to the underwater repose angle of the soil type, setting the bird island top radius according to the average width of the enclosure, and determining the number and shape parameters of the bird island group according to the bird island slope ratio and the bird island top radius;

[0040] Step S105, obtaining the centroid of the bird island group, obtaining the design scheme of the bird island group according to the location of the ecological bird island group, the number of the bird island group and the shape parameters, and calculating the centroid distance between the centroid of the bird island group and the centroid of the embankment group in the bird island group design scheme. Step S105 specifically includes:

[0041] The centroid distance is obtained by formula 5:

[0042]

[0043] Among them, (x1, y1, z1) is the centroid position of the embankment, and (x2, y2, z2) is the centroid position of the bird island.

[0044] Step S106: Evaluate the design scheme of the ecological bird island group by the centroid distance and the radius of the circumscribed circle of the enclosure group to obtain the evaluation result. Step S106 specifically includes:

[0045] Calculate the ratio of the distance from the centroid to the radius of the circumscribed circle of the embankment group. The smaller the ratio, the smaller the engineering workload, the better the economy, and the smallest disturbance. Less than 0.05 is excellent; less than 0.1 is good; less than 0.2 is fair.

[0046] By adopting the embodiments of the present invention, the following beneficial effects are achieved:

[0047] The embodiment of the present invention reduces the amount of earthwork movement in the embankment reconstruction project by controlling the ratio of the centroid distance to the radius of the circumscribed circle of the embankment group, thereby improving the feasibility and efficiency of the embankment reconstruction.

[0048] Device Embodiment

[0049] According to an embodiment of the present invention, an ecological bird island evaluation device based on centroid coincidence is provided. Figure 2 is a schematic diagram of the structure of an ecological bird island evaluation device based on centroid coincidence according to an embodiment of the present invention. Figure 2 As shown, the ecological bird island evaluation device based on centroid coincidence according to an embodiment of the present invention specifically includes:

[0050] The centroid and circumscribed circle acquisition module 21 is used to perform remote sensing extraction of the embankment group in the area to be transformed by remote sensing extraction technology, convert the embankment group into a polygon containing a specific number of basic graphics, and obtain the centroid of the embankment group in the area to be transformed and the radius of the circumscribed circle of the embankment group by processing the polygon. The centroid and circumscribed circle acquisition module 21 is specifically used for:

[0051] The centroid coordinates (x c ,y c , z c ):

[0052]

[0053]

[0054]

[0055] Among them, A i is the area of ​​each basic figure, x i ,y i 、z i are the X, Y, and Z coordinates of the centroid of each basic shape;

[0056] Get the major axis L of the polygon, and make a minimum circumscribed circle O with the midpoint of the major axis as the center and the length of the major axis L as the diameter, or calculate the distance from each vertex of the polygon to the center of the major axis, and make a triangle ABC with the farthest point and the two end points of the major axis to get the minimum circumscribed circle O of triangle ABC;

[0057] Calculate the distance from each vertex of the polygon to the minimum circumscribed circle O, and obtain the maximum distance. The vertex with the maximum distance is recorded as P. The maximum distance is compared with the radius of the minimum circumscribed circle O. If the maximum distance is less than the radius of the minimum circumscribed circle O, the minimum circumscribed circle is the minimum circumscribed circle of the polygon. If the maximum distance is greater than the radius of the minimum circumscribed circle O, calculate the distance between P and the three vertices of triangle ABC, replace the point closest to it with point P to make a new triangle, and calculate the minimum circumscribed circle of the new triangle until the maximum value is less than the radius of the minimum circumscribed circle O.

[0058] The bird island group location acquisition module 22 is used to acquire the intersection location of the enclosure and use the intersection location of the enclosure as the location for constructing the ecological bird island group;

[0059] The earthwork volume module 23 is used to calculate the earthwork volume of the embankment according to the embankment area and the average height of the embankment, and use the earthwork volume of the embankment as the earthwork volume of the embankment reconstruction. The earthwork volume module 23 is specifically used for:

[0060] The earthwork volume of the embankment is calculated by formula 4:

[0061] Q=S 围 ×(h 顶 -h 底 ) Formula 4;

[0062] Among them, Q represents the available earthwork volume, S 围 represents the area of ​​the enclosure, h 顶 represents the average top elevation of the embankment, h 底 Indicates the average bottom elevation of the embankment.

[0063] The bird island group quantity and parameter module 24 is used to determine the bird island slope ratio according to the underwater repose angle of the soil type, set the bird island top radius according to the average width of the enclosure, and determine the number and shape parameters of the bird island group according to the bird island slope ratio and the bird island top radius;

[0064] The bird island group centroid acquisition module 25 is used to obtain the centroid of the bird island group, obtain the design scheme of the bird island group according to the location of the ecological bird island group, the number of the bird island group and the shape parameters, and calculate the centroid distance between the centroid of the bird island group and the centroid of the embankment group in the bird island group design scheme; the bird island group centroid acquisition module 25 is specifically used for:

[0065] The centroid distance is obtained by formula 5:

[0066]

[0067] Among them, (x1, y1, z1) is the centroid position of the embankment, and (x2, y2, z2) is the centroid position of the bird island.

[0068] The evaluation module 26 is used to evaluate the design scheme of the ecological bird island group by the centroid distance and the radius of the circumscribed circle of the enclosure group to obtain the evaluation result. The evaluation module 26 is specifically used for:

[0069] Calculate the ratio of the distance from the centroid to the radius of the circumscribed circle of the embankment group. The smaller the ratio, the smaller the engineering workload, the better the economy, and the smallest disturbance. Less than 0.05 is excellent; less than 0.1 is good; less than 0.2 is fair.

[0070] By adopting the embodiments of the present invention, the following beneficial effects are achieved:

[0071] The embodiment of the present invention reduces the amount of earthwork movement in the embankment reconstruction project by controlling the ratio of the centroid distance to the radius of the circumscribed circle of the embankment group, thereby improving the feasibility and efficiency of the embankment reconstruction.

[0072] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. An ecological bird island evaluation method based on centroid coincidence, characterized in that: include: S1. Perform remote sensing extraction on the embankment group in the area to be transformed by remote sensing extraction technology, convert the embankment group into a polygon containing one or more basic figures, and obtain the centroid of the embankment group in the area to be transformed and the radius of the circumscribed circle of the embankment group by processing the polygon; S2, obtaining the intersection position of the embankment, and using the intersection position of the embankment as the position for constructing the ecological bird island group; S3, calculating the earthwork volume of the embankment according to the area of ​​the embankment and the average height of the embankment, and using the earthwork volume of the embankment as the earthwork volume of the embankment reconstruction; S4, determining the bird island slope ratio according to the underwater repose angle of the soil type, setting the bird island top radius according to the average width of the enclosure, and determining the number and shape parameters of the bird island group according to the bird island slope ratio and the bird island top radius; S5, determining the centroid of the bird island group, obtaining a design scheme of the bird island group according to the location, number and shape parameters of the ecological bird island group, and calculating the centroid distance between the centroid of the bird island group in the bird island group design scheme and the centroid of the embankment group; S6. Evaluate the design scheme of the ecological bird island group by the centroid distance and the circumscribed circle radius of the enclosure group to obtain an evaluation result; The step of obtaining the centroid of the enclosure group in step S1 specifically includes: The centroid coordinates (x c ,y c , z c ): Among them, A i is the area of ​​each basic shape, x i ,y i 、z i are the X, Y, and Z coordinates of the centroid of each basic shape; The step of obtaining the circumscribed circle radius of the enclosure group in step S1 specifically includes: Obtain the major axis L of the polygon, and make a minimum circumscribed circle O with the midpoint of the major axis as the center and the length of the major axis L as the diameter, or calculate the distance from each vertex of the polygon to the center of the major axis, take the farthest point and the two end points of the major axis to make a triangle ABC, and obtain the minimum circumscribed circle O of the triangle ABC; Calculate the distances from each vertex of the polygon to the minimum circumscribed circle O, and obtain the maximum distance, record the vertex with the maximum distance as P, compare the maximum distance with the radius of the minimum circumscribed circle O, if the maximum distance is less than the radius of the minimum circumscribed circle O, then the minimum circumscribed circle is the minimum circumscribed circle of the polygon, if the maximum distance is greater than the radius of the minimum circumscribed circle O, calculate the distances between P and the three vertices of triangle ABC, use point P to replace the point closest to it to make a new triangle, and calculate the minimum circumscribed circle of the new triangle until the maximum distance is less than the radius of the minimum circumscribed circle O; The step S3 calculates the earthwork volume of the embankment according to the embankment area and the average height of the embankment, which specifically includes: The earthwork volume of the embankment is calculated by formula 4: Q=S 围 ×(h 顶 -h 底 ) Formula 4; Among them, Q represents the available earthwork volume, S 围 represents the area of ​​the enclosure, h 顶 represents the average top elevation of the embankment, h 底 Indicates the average bottom elevation of the embankment; The centroid distance calculation method in step S5 specifically includes: The centroid distance is obtained by formula 5: Among them, (x1, y1, z1) is the centroid position of the enclosure, and (x2, y2, z2) is the centroid position of the bird island; The step S6 specifically includes: Calculate the ratio of the centroid distance to the circumscribed circle radius of the enclosure group. If the ratio is less than 0.05, it is excellent; if it is less than 0.1, it is good; if it is less than 0.2, it is fair.

2. An ecological bird island evaluation device based on centroid coincidence, characterized in that: include: A centroid and circumscribed circle acquisition module is used to perform remote sensing extraction of the embankment group in the area to be transformed by remote sensing extraction technology, convert the embankment group into a polygon containing one or more basic figures, and obtain the centroid of the embankment group in the area to be transformed and the circumscribed circle radius of the embankment group by processing the polygon; A bird island group location acquisition module is used to acquire the intersection locations of the enclosures and use the intersection locations of the enclosures as locations for constructing ecological bird island groups; An earthwork volume module, used to calculate the earthwork volume of the embankment according to the embankment area and the average height of the embankment, and use the earthwork volume of the embankment as the earthwork volume of the embankment reconstruction; The bird island group quantity and parameter module is used to determine the bird island slope ratio according to the underwater repose angle of the soil type, set the bird island top radius according to the average width of the enclosure, and determine the number and shape parameters of the bird island group according to the bird island slope ratio and the bird island top radius; The bird island group centroid acquisition module is used to determine the centroid of the bird island group, obtain the design scheme of the bird island group according to the location, number and shape parameters of the ecological bird island group, and calculate the centroid distance between the centroid of the bird island group in the bird island group design scheme and the centroid of the embankment group; An evaluation module, used to evaluate the design scheme of the ecological bird island group by the centroid distance and the circumscribed circle radius of the enclosure group, and obtain an evaluation result; The centroid and circumscribed circle acquisition module is specifically used for: The centroid coordinates (x c ,y c , z c ): Among them, A i is the area of ​​each basic shape, x i ,y i 、z i are the X, Y, and Z coordinates of the centroid of each basic shape; Obtain the major axis L of the polygon, and make a minimum circumscribed circle O with the midpoint of the major axis as the center and the length of the major axis L as the diameter, or calculate the distance from each vertex of the polygon to the center of the major axis, take the farthest point and the two end points of the major axis to make a triangle ABC, and obtain the minimum circumscribed circle O of the triangle ABC; Calculate the distances from each vertex of the polygon to the minimum circumscribed circle O, and obtain the maximum distance, record the vertex with the maximum distance as P, compare the maximum distance with the radius of the minimum circumscribed circle O, if the maximum distance is less than the radius of the minimum circumscribed circle O, then the minimum circumscribed circle is the minimum circumscribed circle of the polygon, if the maximum distance is greater than the radius of the minimum circumscribed circle O, calculate the distances between P and the three vertices of triangle ABC, use point P to replace the point closest to it to make a new triangle, and calculate the minimum circumscribed circle of the new triangle until the maximum distance is less than the radius of the minimum circumscribed circle O; The earthwork volume module is specifically used for: The earthwork volume of the embankment is calculated by formula 4: Q=S 围 ×(h 顶 -h 底 ) Formula 4; Among them, Q represents the available earthwork volume, S 围 represents the area of ​​the enclosure, h 顶 represents the average top elevation of the embankment, h 底 Indicates the average bottom elevation of the embankment; The bird island group centroid acquisition module is specifically used for: The centroid distance is obtained by formula 5: Among them, (x1, y1, z1) is the centroid position of the enclosure, and (x2, y2, z2) is the centroid position of the bird island; The evaluation module is specifically used for: Calculate the ratio of the centroid distance to the circumscribed circle radius of the enclosure group. If the ratio is less than 0.05, it is excellent; if it is less than 0.1, it is good; if it is less than 0.2, it is fair.

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