A method for automatically obtaining and mapping line height in power transmission line design

Abstract

The application discloses a kind of line height automatic acquisition and mapping method in power transmission line design, belong to power transmission line survey design technical field, comprising the following steps: determining the path scheme of to-be-built power transmission line;Obtain power line passage point cloud data;The point cloud data in bandwidth is classified;Establish the equation of the straight line of the tension section of design line, extract the cross power line analysis point cloud set;Using spatial clustering tracking induction method, find the representative midline point of each single conductor and ground wire;Using fitting tracking, establish single power line database;Using density segmentation processing and neighborhood clustering induction method, initially form power line distribution unit power line database;Carry out power line grade unified plan update;Establish design boundary line dangerous point database;Realize the line height automatic extraction and horizontal section drawing generation of crossing scheme and drilling scheme.The application realizes the comprehensive measurement of line height, and simultaneously realizes the automatic extraction of line height information of crossing scheme and drilling scheme, with strong automation degree and high measurement precision.

Description

Technical Field

[0001] This invention relates to the field of power transmission line survey and design technology, and in particular to a method for automatically acquiring and mapping line heights in power transmission line design. Background Technology

[0002] The key task in the survey and design of transmission lines is to map the location and height of crossings along the line corridor, ensuring sufficient safety distance between the designed line and the crossings to guarantee safe operation after the line is built. The most crucial task in transmission line crossing measurements is measuring the height of the crossing power lines.

[0003] When measuring the height of transmission line surveying and design, the height of low-level overhead lines such as 10kV and below power lines and weak current lines is generally within 12 meters, and the conductors are relatively thin. In such cases, estimation using a handheld rangefinder, comparison method, or empirical method is usually sufficient. However, for transmission lines of 35kV and above, the height is often between 20-100 meters, and estimation methods generally have large errors and cannot be used. The common method is to use a total station for on-site measurement. For 10kV (large span in mountainous areas) and above power lines, a total station is used to measure the distance and height difference between the crossing centerline point, sideline point, and the top of the tower in a near-stake observation cycle, determining the relative position of the crossed power line to the current line. When the designed line crosses an existing line, the height of the existing line's ground wire is measured; when the designed line passes under an existing line, the height of the lowest down conductor of the existing line is measured. Common methods for measuring line height include total station height measurement or angle and distance measurement, but these methods require the cooperation of GPS and other equipment to obtain the coordinates and elevations of the centerline and edge lines of the intersection of the existing line and the designed line.

[0004] The conventional method for measuring the line height of transmission lines involves first using GPS to determine the centerline and edge lines of the designed line and crossing transmission lines, and measuring their corresponding coordinates and elevation values. Then, the line height value at each point is measured using the suspended height measurement method. First, the total station is set at the predetermined point. A reflecting prism is placed at the corresponding ground point at the location where the line height is to be measured. The prism height at the ground point is recorded. The horizontal distance between the line height measurement point and the station site, and the height difference between the ground prism point and the prism point are measured. Then, the horizontal brake is locked, and the vertically rotating aiming head is used to target the line height point. The height difference of the line height point is obtained. The line height value is obtained by subtracting the height difference of the ground prism point from the height difference of the highest point and adding the prism height.

[0005] When measuring the height of transmission lines, the target is suspended in the air and cannot be accurately located on the ground. This may cause aiming errors at the target point, affecting the horizontal distance between the image frame station and the target point, thus impacting the accuracy of the image measurement. Summary of the Invention

[0006] The technical problem to be solved by the present invention is to provide a method for automatic acquisition and mapping of line height in transmission line design, which realizes comprehensive measurement of line height, and at the same time realizes automatic extraction of line height information for crossing schemes and drilling schemes, with a high degree of automation and high measurement accuracy.

[0007] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is as follows:

[0008] A method for automatically acquiring and mapping the centerline height in transmission line design includes the following steps:

[0009] S1. Determine the route plan for the transmission line to be built;

[0010] S2. Obtain complete power line channel point cloud data based on the proposed power transmission line route plan;

[0011] S3. Set the bandwidth and classify the point cloud data within the bandwidth into power line point cloud and ground point cloud;

[0012] S4. Establish the straight line equation of the tension section of the designed line based on the power line point cloud and the ground point cloud, and extract the analysis point cloud set of the crossing power lines;

[0013] S5. Use spatial clustering tracking induction method to find the representative midline point of each individual wire and the ground wire;

[0014] S6. Using fitting and tracking, calculate the direction of each individual electric field line and establish a database of individual electric field lines;

[0015] S7. Using density segmentation and neighborhood clustering methods, a preliminary power line database of power line distribution units is formed.

[0016] S8. In the initially formed power line distribution unit power line database, determine the attribution of the representative point of the power line centerline and update the statistical classification of power line levels.

[0017] S9. Extract and assign values ​​to the design boundary line elevation, and establish a database of dangerous points on the design boundary line;

[0018] S10. Based on the database of low-voltage and high-voltage power lines and the database of dangerous points on the design edge line, automatically extract the line height and generate the plan and section diagrams for crossing and drilling schemes.

[0019] A further improvement of the technical solution of the present invention is that: in S2, a multi-rotor equipped with a lidar is used to collect point cloud data of the transmission line path to obtain the topographic data of the route along the designed route in the transmission line path scheme; and the route is rationally planned according to the radar ranging capability.

[0020] A further improvement to the technical solution of the present invention is that: in S3, a channel point cloud with a bandwidth of 75 meters is extracted using the transmission line design scheme as the center line.

[0021] A further improvement of the technical solution of the present invention is as follows: In S4, starting from the power line point cloud and ground point cloud data classified in S3, the straight line equation of the designed transmission line tension section is established with the designed transmission line tension section as the unit, and a 20cm wide point cloud of the power line point cloud is extracted with the designed line as the center as the point cloud set for cross power line analysis; and a 20cm wide point cloud of the ground point cloud is extracted as the point cloud for subsequent difference calculation.

[0022] A further improvement to the technical solution of the present invention is that step S5 includes the following steps:

[0023] S5.1 Based on the straight line equation of the tension section of the designed line, through iterative checks, find all centerline point clouds that satisfy the straight line equation of the tension section of the line, and form a centerline point cloud set;

[0024] S5.2 For the centerline point cloud, the clustering tracking induction method is used to summarize the representative centerline points of each single conductor or ground wire from the centerline point cloud.

[0025] By setting an induction threshold, if the distance between two point clouds is less than the induction threshold, the higher point is selected and the lower point is discarded. This process is repeated cyclically to inductively select the highest point of the midline point set of each single conductor or ground wire as the representative midline point of each single conductor or ground wire.

[0026] A further improvement to the technical solution of the present invention is that the induction threshold is set to 10cm.

[0027] A further improvement to the technical solution of this invention is as follows: In S6, for the power line analysis point set of S4 classification and the representative point of the power line centerline of S5 classification, a search radius of 20cm is set. Taking the representative point of the centerline of S5 classification as the base point, the cross power line analysis point set is fitted and tracked. Through spatial distance calculation, the farthest point of each representative point of the centerline is found in turn as the edge point. The distance between the edge point and the representative point of the centerline is 20cm, and its power line direction value is calculated. A single power line database is established, and each conductor or ground wire contains the three-dimensional coordinates of the representative point of the centerline, the three-dimensional coordinates of the far-end direction point, and the direction value.

[0028] A further improvement to the technical solution of the present invention is that step S7 includes the following steps:

[0029] S7.1 uses density segmentation processing to establish a regional power line database by dividing the segment space of all centerline representative point data, thus completing the distribution summary of centerline representative points of transmission lines.

[0030] S7.2 Using the neighborhood clustering induction method, representative points of the center lines of high-voltage and low-voltage power lines are classified, and a preliminary power line distribution unit power line database is formed.

[0031] A further improvement to the technical solution of the present invention is that S8 includes the following steps:

[0032] S8.1 For low-voltage power line distribution units, considering low-voltage lines, the design of transmission lines is a crossing design, and only the information of the high point of the center line representative point and the corresponding edge line point is taken.

[0033] S8.2 For high-voltage power line distribution units, the point cloud of the power line distribution unit is classified according to the direction of each power line to obtain the updated high-voltage power line distribution unit;

[0034] S8.3 For the updated high-voltage power line distribution unit, the clustering induction method is used to summarize the number of splits of each individual conductor or ground wire according to the different splitting forms.

[0035] S8.4 Establish databases for low-voltage and high-voltage power lines based on the distribution units of low-voltage and high-voltage power lines respectively.

[0036] A further improvement of the technical solution of the present invention is as follows: In S9, the edge line is designed according to the edge line requirements of the design line level, the edge line equation of the tension section of the transmission line is established, and the edge line is directly extracted from the power line point cloud. The spatial clustering tracking induction method is used to fit and find the representative edge line points of each single conductor or ground wire, all of which are set as dangerous points and treated as dangerous points of power crossing. A database of dangerous points of the design edge line is established. The database of dangerous points of the design edge line includes the coordinates of the dangerous points of the design edge line and the elevation of the line.

[0037] The technological advancements achieved by this invention due to the adoption of the above technical solutions are as follows:

[0038] 1. This invention achieves highly intelligent line height measurement, simplifies field operations, and is suitable for line height measurement requirements in local spaces or over long distances and large areas.

[0039] 2. In the analysis point cloud of cross power lines, this invention uses density segmentation processing and neighborhood clustering induction method to form a power line distribution unit database, and fits to obtain the representative centerline point and power line direction of each single conductor or ground wire, thereby determining the power line affiliation, with good affiliation and classification effect.

[0040] 3. This invention determines the class of the same power line based on the conductor splitting pattern and spatial distribution, and performs statistical classification of power line classes, resulting in a high accuracy rate in class classification.

[0041] 4. This invention solves the problem of aiming error caused by the inability to accurately locate the target for measuring the height of transmission lines on the ground, thus improving work efficiency and line height measurement accuracy. The measurement accuracy can reach the centimeter level. Attached Figure Description

[0042] Figure 1 This is a flowchart of the automatic acquisition and mapping method for line height in this invention. Detailed Implementation

[0043] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments:

[0044] like Figure 1 As shown, a method for automatically acquiring and mapping line height in transmission line design includes the following steps:

[0045] S1. Determine the route plan for the transmission line to be built;

[0046] Based on the preliminary on-site route selection, the turning points of the proposed transmission line are determined, which facilitates the determination of the elevation points of the line to be measured and the collection of point cloud data.

[0047] S2. Obtain complete power line channel point cloud data based on the proposed power transmission line route plan;

[0048] A multi-rotor aircraft equipped with a lidar was used to collect point cloud data of the power transmission line route, obtaining topographical information along the route of the designed power transmission line. Based on the radar ranging capability, the flight path was rationally planned to ensure the integrity of the power line point cloud data and provide reliable data for subsequent line height measurement.

[0049] S3. Set the bandwidth and classify the point cloud data within the bandwidth into power line point cloud and ground point cloud;

[0050] The transmission line route scheme was optimized, and a 75-meter bandwidth channel point cloud was extracted using the transmission line design scheme as the centerline. This point cloud data was then classified, mainly acquiring the channel power line point cloud and the ground point cloud, while removing other ground feature point clouds.

[0051] S4. Establish the straight line equation of the tension section of the designed line based on the power line point cloud and the ground point cloud, and extract the analysis point cloud set of the crossing power lines;

[0052] Starting from the S3-classified power line point cloud and ground point cloud data, the straight line equation of the designed transmission line tension section is established using the designed transmission line tension section as the unit. A 20cm wide point cloud of the power line point cloud is extracted with the designed line as the center as the point cloud set for cross-power line analysis; and a 20cm wide point cloud of the ground point cloud is extracted as the subsequent difference calculation to reduce the corresponding data volume.

[0053] S5. Use spatial clustering tracking induction method to find the representative midline point of each individual wire and the ground wire;

[0054] Based on the distribution characteristics of power line point clouds and airborne scanning characteristics, the point clouds of power line conductors or ground wires generally obtained by scanning are the upper part of the conductors or ground wires. Therefore, all centerline points of power lines are first found according to the straight line equation of the tension section of the designed line. Since there are generally safety distance requirements for the spatial distance of each individual power line conductor and ground wire, the high points of the centerline point set of each individual conductor or ground wire are summarized using the spatial clustering tracking induction method as the representative centerline points of each individual conductor or ground wire.

[0055] S5 specifically includes the following steps:

[0056] S5.1 Based on the straight line equation of the tension section of the designed line, through iterative checks, find all centerline point clouds that satisfy the straight line equation of the tension section of the line, and form a centerline point cloud set;

[0057] When considering the design route, it is not allowed for the designed route to run parallel to the existing route. That is, the angle between the designed route and the existing route cannot be too small. Furthermore, the airborne scanning point cloud of the conductor and ground wire is generally a single point. According to the straight line equation of the tension section of the designed route, through iterative checks, all centerline point clouds that satisfy the straight line equation of the tension section of the route are found.

[0058] S5.2 For the centerline point cloud, the clustering tracking induction method is used to summarize the representative centerline points of each single conductor or ground wire from the centerline point cloud.

[0059] Based on the characteristic that the range of the centerline point set of each individual wire or ground wire is very small compared with the distance between the wires or ground wires, and considering the incompleteness of the point cloud of the scanned wires or ground wires, by setting a generalization threshold, if the distance between two point clouds is less than the generalization threshold, the higher point is taken and the lower point is discarded. This process is repeated cyclically to generalize the higher point of the centerline point set of each individual wire or ground wire as the representative centerline point of each individual wire or ground wire.

[0060] The induction threshold is set to 10cm.

[0061] S6. Using fitting and tracking, calculate the direction of each individual electric field line and establish a database of individual electric field lines;

[0062] For the power line analysis point set of S4 classification and the representative point of the power line centerline of S5 classification, a search radius of 20cm is set. Using the representative point of the centerline of S5 classification as the base point, the cross power line analysis point set is fitted and tracked. Through spatial distance calculation, the farthest point of each representative point of the centerline is found as the edge point. The distance between the edge point and the representative point of the centerline is 20cm, and its power line direction value is calculated. A database of single power lines is established. Each conductor or ground wire contains the three-dimensional coordinates of the representative point of the centerline, the three-dimensional coordinates of the far-end direction point, and the direction value.

[0063] S7. Using density segmentation and neighborhood clustering methods, a preliminary power line database of power line distribution units is formed.

[0064] By using density segmentation and neighborhood clustering methods, representative points of the centerline are summarized to find point clouds belonging to a transmission line; the corresponding ground distance line height values ​​are obtained by difference calculation, and representative points of the centerline of high-voltage and low-voltage power lines are distinguished according to the regional ground distance.

[0065] S7 specifically includes the following steps:

[0066] S7.1 uses density segmentation processing to establish a regional power line database by dividing the segment space of all centerline representative point data, thus completing the distribution summary of centerline representative points of transmission lines.

[0067] Based on the linear distribution characteristics of power line point clouds and the characteristics of airborne scanning, the point clouds of power line conductors or ground wires generally obtained by scanning are the upper part of the conductors or ground wires. For the single power line database established by S6, the representative points of the centerline are divided into power line point cloud spaces on the vertical plane of the designed line according to the straight line equation of the tension section of the designed line. The space is divided into segments at 1-meter intervals from the starting point of the tension section of the designed line. The segments without data are removed, and the segment spaces of all centerline representative point data are used to establish a regional power line database. Each row is a segment space, and each column includes the segment number and the database information of the single power line in the segment space, thus completing the distribution summary of the representative points of the centerline of the transmission line.

[0068] S7.2 Using the neighborhood clustering induction method, representative points of the center lines of high-voltage and low-voltage power lines are classified, and a preliminary power line distribution unit power line database is formed.

[0069] Based on spatial location, the spatial segments of adjacent centerline representative point data are merged into neighborhoods; based on the planar X and Y values ​​of each representative centerline point, the three-dimensional coordinates of the corresponding ground points in the ground DEM are obtained, and the corresponding ground distance line height values ​​are calculated through the difference; considering that the ground distance of high-voltage power lines is generally more than 15 meters and that of low-voltage power lines is generally less than 10 meters, the distribution units of high-voltage and low-voltage power lines are distinguished, and the representative points of the centerlines of high-voltage and low-voltage power lines are classified, thus initially forming a power line database for power line distribution units.

[0070] S8. In the initially formed power line distribution unit power line database, determine the attribution of the representative point of the power line centerline and update the statistical classification of power line levels.

[0071] In the power line distribution unit, the center line representative point of the power line is determined based on the direction and spacing of the individual power lines to determine whether they belong to the same power line, different transmission lines are classified, and the number of phases of each individual power line is counted to prepare for determining the power line level.

[0072] S8 specifically includes the following steps:

[0073] S8.1 For low-voltage power line distribution units, considering low-voltage lines, the design of transmission lines is a crossing design, and only the information of the high point of the center line representative point and the corresponding edge line point is taken.

[0074] Considering low-voltage lines, the design of transmission lines is based on crossing design, which means that the representative point of the high neutral line of the low-voltage line is obtained. The types include 10kV and 380V. Here, based on its distance from the ground, if the distance value is greater than 8 meters, it is identified as a 10kV line, and if it is less than 8 meters, it is identified as a 380V line.

[0075] S8.2 For high-voltage power line distribution units, the point cloud of the power line distribution unit is classified according to the direction of each power line to obtain the updated high-voltage power line distribution unit;

[0076] In each power line distribution unit, based on the X and Y coordinates of the centerline representative point and the corresponding edge point, as well as the direction of the corresponding single power line, single power lines with the same direction are grouped into one transmission line. The direction angle difference of less than 3 degrees is regarded as the classification condition. The high-voltage power line distribution units are re-divided to achieve the uniqueness of high-voltage power lines.

[0077] S8.3 For the updated high-voltage power line distribution unit, the clustering induction method is used to summarize the number of splits of each individual conductor or ground wire according to the different splitting forms.

[0078] Considering that the number of representative points of the centerline is very small in each high-voltage power line distribution unit at the same angle, and the spacing between the single conductors of each phase of the line is very small, coupled with the safety distance requirements between each phase, a threshold for the spacing between the single conductors of each phase can be set. It is recommended that the spacing threshold be set to 1 meter. Clustering and summarizing are performed to find the representative points of the centerline of the power line in each phase, and the number of these points is the number of splits. The average elevation of the highest and lowest centerline representative points of each phase is recorded, and the coordinates of the high points and the average elevation are used as the representative points of the centerline of the power line in each phase.

[0079] The voltage rating of each high-voltage power line is determined by the number of conductor splits, and a code is assigned accordingly. Generally, a single conductor is 35kV or 110kV, two or three splits are 220kV, four splits are 500kV, six splits are 750kV, and eight splits are 800kV or 1000kV ultra-high voltage lines.

[0080] S8.4 Establish databases for low-voltage and high-voltage power lines based on the distribution units of low-voltage and high-voltage power lines, respectively;

[0081] For low-voltage power line distribution units, only the information of the highest point of the center line representative point and the corresponding edge point, as well as the line height and voltage level code, are taken. For the updated high-voltage power line distribution units, the information of the highest point of the center line representative point and the corresponding edge point, the information of the lowest point of the center line representative point and the corresponding edge point, as well as the line height and voltage level code, must be extracted separately.

[0082] S9. Extract and assign values ​​to the design boundary line elevation, and establish a database of dangerous points on the design boundary line;

[0083] Design the boundary line according to the requirements of the design line level boundary line, establish the boundary line equation of the tension section of the transmission line, directly extract it from the power line point cloud, and use the spatial clustering tracking induction method to fit and find the representative boundary line points of each single conductor or ground wire. All of them are set as dangerous points and treated as dangerous points of power crossing. Establish a database of dangerous points of the design boundary line, which includes the coordinates of the dangerous points of the design boundary line and the elevation of the line.

[0084] S10. Based on the database of low-voltage and high-voltage power lines and the database of dangerous points on the design edge line, automatically extract the line height and generate the plan and section diagrams for crossing and drilling schemes.

[0085] Based on the databases of low-voltage and high-voltage power lines established in S8 and S9, as well as the database of dangerous points on the design edge lines, line plan and cross-section diagrams are generated according to the line mapping coding rules to facilitate the application of pole arrangement in line design.

[0086] In summary, this invention enables comprehensive measurement of line height and automatic extraction of line height information for both crossing and drilling schemes, exhibiting a high degree of automation and high measurement accuracy.

Claims

1. A method for automatically acquiring and mapping centerline height in transmission line design, characterized in that: Includes the following steps: S1. Determine the route plan for the transmission line to be built; S2. Obtain complete power line channel point cloud data based on the proposed power transmission line route plan; S3. Set the bandwidth and classify the point cloud data within the bandwidth into power line point cloud and ground point cloud; S4. Based on the power line point cloud and ground point cloud, establish the straight line equation of the tension section of the designed transmission line and extract the point cloud set for cross-power lines. In S4, starting from the power line point cloud and ground point cloud data classified in S3, take the tension section of the designed transmission line as the unit, establish the straight line equation of the tension section of the designed transmission line, and extract a 20cm wide point cloud of the power line point cloud as the center of the designed line as the point cloud set for cross-power lines; and extract a 20cm wide point cloud of the ground point cloud as the subsequent difference calculation. S5. Use spatial clustering tracking induction method to find the representative midline point of each individual wire and the ground wire; S6. Using fitting and tracking, calculate the direction of each individual electric field line and establish a database of individual electric field lines; S7. Using density segmentation and neighborhood clustering methods, a preliminary power line database of power line distribution units is formed. S8. In the initially formed power line distribution unit power line database, determine the attribution of the representative point of the power line centerline and update the statistical classification of power line levels. S9. Extract and assign values ​​to the design boundary line elevation, and establish a database of dangerous points on the design boundary line; In S9, the edge line is designed according to the requirements of the design line level edge line, and the edge line equation of the tension section of the transmission line is established. It is directly extracted from the power line point cloud, and the representative edge line points of each single conductor or ground wire are found by using the spatial clustering tracking induction method. All of them are set as dangerous points and treated as dangerous points of power crossing. A database of dangerous points of the design edge line is established, which includes the coordinates of the dangerous points of the design edge line and the elevation of the line. S10. Based on the database of low-voltage and high-voltage power lines and the database of dangerous points on the design edge line, automatically extract the line height and generate the plan and section diagrams for crossing and drilling schemes.

2. The method for automatic acquisition and mapping of line height in transmission line design according to claim 1, characterized in that: In S2, a multi-rotor equipped with a lidar is used to collect point cloud data of the transmission line path to obtain topographic data along the designed route in the transmission line path scheme. Plan flight routes rationally based on radar ranging capabilities.

3. The method for automatic acquisition and mapping of line height in transmission line design according to claim 1, characterized in that: In S3, a 75-meter bandwidth channel point cloud is extracted using the power transmission line design scheme as the centerline.

4. The method for automatic acquisition and mapping of line height in transmission line design according to claim 1, characterized in that: S5 includes the following steps: S5.1 Based on the straight line equation of the tension section of the designed line, through iterative checks, find all centerline point clouds that satisfy the straight line equation of the tension section of the line, and form a centerline point cloud set; S5.2 For the centerline point cloud, the clustering tracking induction method is used to summarize the representative centerline points of each single conductor or ground wire from the centerline point cloud. By setting an induction threshold, if the distance between two points is less than the induction threshold, the higher point is selected and the lower point is discarded. This process is repeated cyclically to inductively select the highest point of the midline point set of each individual conductor or ground wire as the representative midline point of each individual conductor or ground wire.

5. The method for automatic acquisition and mapping of line height in transmission line design according to claim 4, characterized in that: The induction threshold is set to 10cm.

6. The method for automatic acquisition and mapping of line height in transmission line design according to claim 1, characterized in that: In S6, for the power line analysis point set of S4 classification and the representative point of the power line centerline of S5 classification, a search radius of 20cm is set. Using the representative point of the centerline of S5 classification as the base point, the cross power line analysis point set is fitted and tracked. Through spatial distance calculation, the farthest point of each representative point of the centerline is found as the edge point. The distance between the edge point and the representative point of the centerline is 20cm, and its power line direction value is calculated. A single power line database is established, and each conductor or ground wire contains the three-dimensional coordinates of the representative point of the centerline, the three-dimensional coordinates of the far-end direction point, and the direction value.

7. The method for automatic acquisition and mapping of line height in transmission line design according to claim 1, characterized in that: S7 includes the following steps: S7.1 uses density segmentation processing to establish a regional power line database by dividing the segment space of all centerline representative point data, thus completing the distribution summary of centerline representative points of transmission lines. S7.2 Using the neighborhood clustering induction method, representative points of the center lines of high-voltage and low-voltage power lines are classified, and a preliminary power line distribution unit power line database is formed.

8. The method for automatic acquisition and mapping of line height in transmission line design according to claim 1, characterized in that: S8 includes the following steps: S8.1 For low-voltage power line distribution units, considering low-voltage lines, the design of transmission lines is a crossing design, and only the information of the high point of the center line representative point and the corresponding edge line point is taken. S8.2 For high-voltage power line distribution units, the point cloud of the power line distribution unit is classified according to the direction of each power line to obtain the updated high-voltage power line distribution unit; S8.3 For the updated high-voltage power line distribution unit, the clustering induction method is used to summarize the number of splits of each individual conductor or ground wire according to the different splitting forms. S8.4 Establish databases for low-voltage and high-voltage power lines based on the distribution units of low-voltage and high-voltage power lines respectively.

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