Separation distance processing method, separation distance processing device, display device, and program

Abstract

To propose a separation distance processing method and the like suitable for processing using a separation distances calculated based on mesh data.SOLUTION: A separation distance processing device 7 performs processing using a separation distance between a transmission line position identified by transmission line mesh data and a ground position identified by terrain mesh data. A mesh of the transmission line mesh data is smaller than a mesh of the terrain mesh data. A terrain processing unit 17 of the separation distance processing device 7 sets multiple points included in the mesh with respect to each mesh in the terrain mesh data. A separation distance processing unit 21 of the separation distance processing device 7 identifies the mesh whose separation distance from each point set by the terrain processing unit 17 is closer than a reference value in the meshes included in the transmission line mesh data.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a distance processing method, a distance processing device, a display device, and a program, and in particular to a distance processing method for calculating the distance between a power line position identified by power line mesh data and a ground position identified by topographical mesh data. [Background technology]

[0002] Patent Document 1 describes the creation of a power transmission line drawing consisting of a plan view and a longitudinal section view in accordance with commands input by an operator. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2002-024336 A Summary of the Invention [Problem to be solved by the invention]

[0004] However, as described in Patent Document 1, the decision as to whether the power line is sufficiently far from the ground is made by an operator. The longitudinal section is created at a scale of, for example, 1:400 vertically and 1:2000 horizontally, and it is considered difficult to judge this from a three-dimensional drawing.

[0005] Therefore, an object of the present invention is to propose a separation distance processing method suitable for performing processing using a separation distance calculated using mesh data. [Means for solving the problem]

[0006] A first aspect of the present invention is a distance processing method that uses a distance between a power line position identified by power line mesh data and a ground position identified by topographical mesh data, wherein a mesh of the power line mesh data is smaller than a mesh of the topographical mesh data, and the method includes a step of a topographical processing unit provided in a distance processing device setting, for each mesh in the topographical mesh data, a plurality of points included in the mesh, and a step of a distance processing unit provided in the distance processing device identifying, from among the meshes included in the power line mesh data, meshes whose distance from each of the points set by the topographical processing unit is closer than a reference value.

[0007] A second aspect of the present invention is a distance processing method according to the first aspect, comprising a step in which a display unit provided in a display device displays a mesh of the power line mesh data whose distance from at least one point is closer than a reference value, and a point set in the mesh of the topography mesh data that is closest to the mesh, connected by a line segment.

[0008] A third aspect of the present invention is a separation distance processing method according to the first or second aspect, wherein the power line identified by the power line mesh data includes a plurality of lateral sway states when the power line sways laterally, and the separation distance processing unit identifies, for each of the lateral sway states, meshes included in the power line mesh data that have a separation distance from each of the points set by the terrain processing unit that is closer than a reference value.

[0009] A fourth aspect of the present invention is a separation distance processing method according to any one of the first to third aspects, wherein the distance between points included in each mesh in the topographical mesh data is the length of one side of the mesh of the power line mesh data.

[0010] A fifth aspect of the present invention is a distance processing device that uses a distance between a power line position identified by power line mesh data and a ground position identified by topographical mesh data, the device comprising a terrain processing unit and a distance processing unit, wherein a mesh of the power line mesh data is smaller than a mesh of the topographical mesh data, the terrain processing unit sets a plurality of points included in each mesh in the topographical mesh data, and the distance processing unit identifies, among the meshes included in the power line mesh data, meshes that have a distance from each of the points set by the topographical processing unit that is closer than a reference value.

[0011] A sixth aspect of the present invention is a display device having a display unit that displays a mesh identified by the distance processing unit of the fifth aspect, wherein the display unit displays a mesh of the power line mesh data whose distance from at least one point is closer than a reference value, and a point set in the mesh of the topography mesh data that is closest to the mesh by a line segment.

[0012] A seventh aspect of the present invention is a separation distance processing device of the fifth aspect, wherein the power line identified by the power line mesh data includes a plurality of lateral sway states when the power line sways laterally, and the separation distance processing unit identifies, for each of the lateral sway states, meshes included in the power line mesh data that have a separation distance from each of the points set by the terrain processing unit that is closer than a reference value.

[0013] An eighth aspect of the present invention is a distance processing device according to the fifth or seventh aspect, wherein the distance between points included in each mesh in the topographical mesh data is the length of one side of the mesh of the power line mesh data.

[0014] A ninth aspect of the present invention is a remote processing system including the remote processing device according to any one of the fifth, seventh, or eighth aspects, and the display device according to the sixth aspect.

[0015] A tenth aspect of the present invention is a program for causing a computer to function as a terrain processing unit and a separation distance processing unit provided in a separation distance processing device that uses a separation distance between a power line position identified by power line mesh data and a ground position identified by topographical mesh data, wherein a mesh of the power line mesh data is smaller than a mesh of the topographical mesh data, the terrain processing unit sets a plurality of points included in each mesh in the topographical mesh data, and the separation distance processing unit identifies, among the meshes included in the power line mesh data, meshes that are closer to each of the points set by the topographical processing unit than a reference value.

[0016] The present invention may be understood as a computer-readable recording medium having the program of the tenth aspect recorded thereon. Effect of the Invention

[0017] According to each aspect of the present invention, by creating power line mesh data as small meshes, finely dividing the mesh of the topographical mesh data to set points, and calculating and processing the separation distance, it is possible to calculate the separation distance with sufficient accuracy even if the topographical mesh data is a large mesh (e.g., a 5m mesh). [Brief description of the drawings]

[0018] [Figure 1] 1 is a block diagram showing an example of a configuration of a remote distance processing system 1 according to an embodiment of the present invention. [Diagram 2] 2 is a flow chart showing an example of the operation of the distance processing device 7 of FIG. 1. [Diagram 3] 4 is a flow chart showing an example of processing by the display processing unit 27. FIG. [Figure 4] 10 is a diagram for explaining an example of a process for generating power line mesh data in the power line processing unit 13. FIG. [Diagram 5] FIG. 13 is a diagram for explaining an example of a process in which the terrain processing unit 17 sets points in each mesh of the terrain mesh data. [Figure 6] 11 is a diagram for explaining an example of a display process by a display processing unit 27. FIG. [Figure 7] FIG. 13 is a diagram for explaining another example of a display device. [Figure 8] 8 is a flow chart showing an example of the operation of the display device 101 of FIG. 7. [Figure 9] 8 is a diagram showing an example of a display process in the display device 101 of FIG. 7. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0019] Hereinafter, an embodiment of the present invention will be described with reference to the drawings, however, the present invention is not limited to the embodiment. EXAMPLES

[0020] 1 is a block diagram showing an example of the configuration of a remote distance processing system 1 according to an embodiment of the present invention. The remote distance processing system 1 includes a geospatial information server 3, a measuring device 5, a remote distance processing device 7 (an example of the "remote distance processing device" in the claims), and a display device 9 (an example of the "display device" in the claims).

[0021] Geospatial information is information related to geography and space. Basic map information is an example of geospatial information, and is location information such as surveying reference points, coastlines, boundaries of public facilities, and administrative districts that serve as the basis for determining the location of geospatial information on electronic maps.

[0022] A digital elevation model is one of the basic map information, and is mesh data of elevation. Currently, elevation and digital topography are provided in, for example, 5m meshes. Mesh data is a regional mesh defined as a longitude-latitude grid on a map in order to digitize map information and collect various statistical information. A 5m mesh is a regional mesh with each side measuring 5m.

[0023] The geospatial information server 3 is a server that provides geospatial information. The geospatial information server 3 provides, for example, base map information. Since the base map information is provided in a 5m mesh, the geospatial information is generally also provided in a 5m mesh.

[0024] The measuring device 5 measures the shape of the earth's surface (topography), the condition of plants (tops of trees, etc.), altitude, etc., by measuring processes (such as laser measurement, radar measurement, etc.) while detecting the position, for example.

[0025] The distance processing device 7 includes a device communication unit 11, a power line processing unit 13, a power line memory unit 15, a terrain processing unit 17, a terrain memory unit 19, a distance processing unit 21, an incompatible combination memory unit 23, a dangerous combination memory unit 25 and a display processing unit 27.

[0026] The device communication unit 11 communicates with the geospatial information server 3, the measuring device 5, and the display device 9 via wired communication and / or wireless communication.

[0027] The power transmission line processing unit 13 performs processing related to the power transmission line. The power transmission line may be one that is actually installed or one that is in the planning stage of installation. The power transmission line mesh data is mesh data that specifies the position and shape of the power transmission line. In this example, the power transmission line mesh data is a 1 m mesh. In the present invention, the power transmission line storage unit 15 stores data used for processing by the power transmission line processing unit 13.

[0028] The terrain processing unit 17 performs processing related to the earth's surface. The terrain mesh data is mesh data that specifies the terrain. In this example, the terrain mesh data is a 5m mesh. The terrain processing unit 17, for example, sets multiple points in each mesh of the processing target area in the terrain mesh data. The terrain processing unit 17 performs processing related to the position and altitude of each point, the state of plants (which may be a state obtained by actual measurement, or a current or future state predicted from the shape of the earth's surface), and the like. The terrain processing unit 17 calculates, for example, the position and altitude of each point. The terrain memory unit 19 stores data used in processing by the terrain processing unit 17.

[0029] The separation distance processing unit 21 calculates the separation distance between the power line (position and altitude) specified by each mesh of the power line mesh data and each point in the topographical mesh data. When the separation distance is closer than a first reference value, the separation distance processing unit 21 determines that the state is unsuitable. When the separation distance is farther than the first reference value and closer than a second reference value, the separation distance processing unit 21 determines that the state is suitable but dangerous. The unsuitable combination storage unit 23 stores unsuitable combinations. An unsuitable combination is a combination of a mesh determined to be unsuitable in the power line mesh data and a point closest to the mesh. The dangerous combination storage unit 25 stores dangerous combinations. A dangerous combination is a combination of a mesh determined to be dangerous in the power line mesh data and a point closest to the mesh.

[0030] The first reference value and the second reference value are a small value and a large value, respectively. The first reference value and the second reference value may be the same value throughout the entire processing target area, or may be different values ​​for each area into which the processing target area is divided. For example, the first reference value and the second reference value may be values ​​that change according to the state of plants at each point. For example, in an area where plants grow poorly, the reference value may be small, but in an area where plants grow well, the reference value must be large. For example, in an area where plants grow poorly, the top of the trees is assumed to be 20m, and the first reference value is set to 22m with a margin of 2m, and the second reference value is set to 25m. For example, in an area where plants grow well, the top of the trees is assumed to be 25m, and the first reference value is set to 29m with a margin of 4m, and the second reference value is set to 32m.

[0031] The display processing unit 27 displays the power line mesh data and points included in the inappropriate combinations and dangerous combinations on the display device 9. The display processing unit 27 displays, for example, the power line mesh data and the topographical mesh data on the display device 9. The meshes of the power line mesh data included in the inappropriate combinations and the points are displayed connected by yellow lines. The meshes of the power line mesh data included in the dangerous combinations and the points are displayed connected by red lines. Points that are not included in either the inappropriate combinations or the dangerous combinations are displayed in white.

[0032] The display device 9 includes a display communication unit 31, a display control unit 33, and a display unit .

[0033] The display communication unit 31 communicates with the distance processing device 7 via wired communication and / or wireless communication.

[0034] The display unit 35 is a display unit such as a display, a touch panel, etc. The display control unit 33 performs display processing on the display unit 35 according to an instruction from the display processing unit 27.

[0035] Each of the processing units and each of the control units can be realized by, for example, a processor that performs processing defined by a program, and each of the storage units can be realized by a storage device such as a memory.

[0036] FIG. 2 is a flow chart showing an example of the operation of the distance processing device 7 of FIG.

[0037] The terrain processing unit 17 acquires terrain mesh data from the geospatial information server 3 and / or the measuring device 5 (step STA1). The terrain processing unit 17 stores the terrain mesh data in the terrain storage unit 19.

[0038] The terrain processing unit 17 identifies the positions and heights of multiple pylons in the terrain mesh data (step STA2). The position and height of each pylon may be set according to a user's instruction, may be set automatically from the terrain mesh data, or may be automatically corrected based on the user's instruction using the terrain mesh data. The terrain processing unit 17 stores the data related to the pylons in the terrain memory unit 19.

[0039] The power transmission line processing unit 13 specifies the position where the power transmission line is hung on each pylon, and sets power transmission line mesh data that specifies the position and shape of the power transmission line between the pylons (step STA3). Since the power transmission line sways horizontally due to wind or the like, the power transmission line mesh data includes specifying the positions and shapes of multiple swaying states of the power transmission line caused by the swaying. The power transmission line processing unit 13 stores the power transmission line mesh data in the power transmission line storage unit 15.

[0040] The terrain processing unit 17 performs point processing (step STA4). Since the positions of the steel tower and the power transmission line are determined, the range within a certain distance from the steel tower and the power transmission line in the terrain mesh data is set as the processing target area. The terrain processing unit 17 sets a plurality of points in each mesh of the processing target area in the terrain mesh data. The distance between the points is closer than that of the mesh of the terrain mesh data. For example, the terrain mesh data is a 5m mesh, and the distance between the points is 1m according to the power transmission line mesh data. A first reference value and a second reference value are set for each point. The first reference value and the second reference value may be set according to the user's instructions, may be set according to sunlight obtained by analyzing the terrain mesh data, or may be automatically set by including data indicating good plant growth in the terrain mesh data. The first reference value is smaller than the second reference value.

[0041] The separation distance processing unit 21 selects one mesh from the power transmission line mesh data (step STA5). The selected mesh is called a "target power transmission line mesh."

[0042] The separation distance processing unit 21 calculates the distance (separation distance) between the target power line mesh and the point set in each mesh of the processing target area in the topographical mesh data (step STA6). The shortest of the calculated separation distances is called the shortest separation distance.

[0043] The separation distance processing unit 21 judges whether the shortest separation distance is equal to or less than a first reference value (step STA7). If the shortest separation distance is equal to or less than the first reference value, the unqualified combination is stored in the unqualified combination storage unit 23, and the process proceeds to step STA11. An unqualified combination is a combination of a target power transmission line mesh and a point closest to the target power transmission line mesh. If there are multiple points closest to the target power transmission line mesh, the point closest to the central position (such as the center of gravity) in the group of points is selected. If the shortest separation distance is greater than the first reference value, the process proceeds to step STA9.

[0044] In step STA9, the separation distance processing unit 21 judges whether the shortest separation distance is equal to or less than the second reference value. If the shortest separation distance is equal to or less than the second reference value, the dangerous combination is stored in the dangerous combination storage unit 25, and the process proceeds to step STA11. A dangerous combination is a combination of a target power transmission line mesh and a point closest to the target power transmission line mesh. If there are multiple points closest to the target power transmission line mesh, the point closest to the central position (such as the center of gravity) in the group of points is selected. If the shortest separation distance is greater than the second reference value, the process proceeds to step STA11.

[0045] In step STA11, the separation distance processing unit 21 judges whether or not all meshes included in the power line mesh data have been selected. If there are unselected meshes, the process returns to step STA5. In step STA5, the separation distance processing unit 21 selects one mesh from the unselected power line mesh data and performs the subsequent processing. If all meshes have been judged, the process ends.

[0046] FIG. 3 is a flow chart showing an example of processing by the display processing unit 27. As shown in FIG.

[0047] The display processing unit 27 reads out the topographical mesh data, the power transmission line mesh data, and the data relating to the steel tower (steps STB1, STB2, and STB3).

[0048] The display processing unit 27 reads out the unqualified combination and the dangerous combination (step STB4).

[0049] The display processing unit 27 performs display processing on the display device 9 (step STB5). For example, the display processing unit 27 displays the power line mesh data, the topographical mesh data, and the data related to the pylon. The display processing unit 27 displays the meshes of the power line mesh data included in the unqualified combinations and the points by connecting them with yellow lines on the display device 9. The meshes of the power line mesh data included in the dangerous combinations and the points by connecting them with red lines. Points that are not included in either the unqualified combinations or the dangerous combinations are displayed in white.

[0050] FIG. 4 is a diagram for explaining an example of a process of generating power line mesh data in the power line processing unit 13. In FIG.

[0051] As shown in FIG. 4(a), data on transmission towers is used to identify the positions of transmission towers 55 and 57 and the positions at which the transmission lines are hung on these transmission towers. An actual transmission line does not have a line segment 59 connecting the position at which the transmission line is hung on transmission tower 55 and the position at which the transmission line is hung on transmission tower 57, but has a shape 61 with a slanted center. The transmission line mesh data is mesh data that identifies the shape 61 with a slanted center. Typically, multiple transmission lines are hung on a transmission tower. The transmission line mesh data identifies the shape of each of the multiple transmission lines.

[0052] As shown in FIG. 4(b), the power line sways sideways due to wind, etc. Position 67 is the position of the power line when there is no swaying. Point 65 is a point on line segment 59. When there is swaying sideways, due to a drop in temperature, etc., the power line does not move on an arc of a constant radius centered on point 65, but the radius becomes smaller as the swaying increases. The power line mesh data identifies the position and shape of the power line in multiple swaying states. In this example, the power line mesh data identifies positions 71, 73, and 75 of the power line when swaying sideways by 15 degrees, 30 degrees, and 60 degrees occurs. The swaying state takes into account, for example, a state moving away from the tower.

[0053] For example, an overview of the determination process of the present invention will be described with reference to Fig. 4(a). A terrain 51 is specified by terrain mesh data. Plants such as trees are expected to grow from the terrain 51 to a tree tip position 53 at a predetermined height. A separation distance processing device 7 uses the separation distance to specify a position 63 where the shape 61 of the power transmission line and the tree tip position 53 may overlap.

[0054] Conventionally, such judgments were made using plan views and longitudinal sections. However, longitudinal sections are created at a scale of, for example, 1:400 vertically and 1:2000 horizontally, and it was considered difficult to judge this using 3D drawings. In addition, the topographic mesh data is a 5m mesh, and it was considered that sufficient accuracy of judgment could not be obtained. Furthermore, only the state without lateral shaking (position 67 in Figure 4(b)) was targeted.

[0055] The separation distance processing device 7 ensures sufficient accuracy in calculating the separation distance by making the mesh of the power line mesh data finer than the mesh of the topographical mesh data, and subdividing each mesh of the topographical mesh data to match the power line mesh data and calculating the separation distance. Furthermore, it is possible to determine the separation distance even when lateral swaying occurs. Furthermore, since the mesh of the topographical mesh data is large, the amount of topographical mesh data required to display the topography can be reduced.

[0056] FIG. 5 is a diagram for explaining an example of the process in which the terrain processing unit 17 sets points in each mesh of the terrain mesh data.

[0057] As shown in Fig. 5(a), the terrain processing unit 17 can use data related to the towers to identify the positions of the towers 55 and 57 and the line segment 59 connecting the positions where the power transmission lines are hung from these towers. Positions 77 and 79 are positions in the terrain mesh data that are at a certain distance from the towers and the power transmission lines. The range between positions 77 and 79 is the processing target area.

[0058] 5(b), the terrain processing unit 17 sets multiple points in each mesh of the processing target area in the terrain mesh data. In this example, the 5 m mesh of the processing target area is divided into 1 m meshes, and points are set by each vertex of the 1 m mesh.

[0059] FIG. 6 is a diagram for explaining an example of the display process by the display processing unit 27. As shown in FIG.

[0060] It is assumed that the distance between a mesh 81 of the power transmission line mesh data and the nearest point 83 is shorter than a first reference value. The combination of the mesh 81 and the point 83 is included in the ineligible combinations.

[0061] The display processing unit 27 displays the line segment connecting the mesh 81 and the point 83 as an indication of an unqualified combination, for example, in a yellow solid line.

[0062] A mesh 85 of the power transmission line mesh data is separated from a nearest point 87 by a distance greater than a first reference value but smaller than a second reference value. The combination of mesh 85 and point 87 is included in the risky combination.

[0063] The display processing unit 27 displays the line segment connecting the mesh 85 and the point 87 as a display of the dangerous combination in a manner different from that of the unsuitable combination. For example, it displays it as a red dashed line.

[0064] Another example of the display device will be described with reference to Fig. 7 to Fig. 9. In this example, the display device is a wearable terminal, and a worker wears the display device and walks around the work site.

[0065] The display device 101 includes a position detection unit 103 , a display control unit 105 , a display unit 107 , a power line storage unit 109 , a topography storage unit 111 , an unsuitable combination storage unit 113 , and a dangerous combination storage unit 115 .

[0066] The power transmission line storage unit 109, the topography storage unit 111, the unqualified combination storage unit 113, and the dangerous combination storage unit 115 store the same data as the power transmission line storage unit 15, the topography storage unit 19, the unqualified combination storage unit 23, and the dangerous combination storage unit 25 in Fig. 1, respectively. However, data that is not necessary for processing in the display device 101 does not need to be held.

[0067] FIG. 8 is a flow diagram showing an example of the operation of the display device 101 of FIG.

[0068] The position detection unit 103 detects the position where the display device 101 is located and the orientation of the display device 101 (step STC1).

[0069] The display control unit 105 refers to the positions and orientations detected by the position detection unit 103, and reads out the unsuitable combinations and dangerous combinations to be displayed (step STC2).

[0070] The display control unit 105 performs display processing (step STC3). The display control unit 105 displays lines connecting the meshes and points included in the unqualified combinations, and displays lines connecting the meshes and points included in the risky combinations in a manner different from that of the unqualified combinations.

[0071] Fig. 9 is a diagram showing an example of display processing in the display device 101 of Fig. 7. The display device 101 is realized, for example, by a glasses-type wearable terminal 121 worn by a worker.

[0072] It is assumed that the mesh 123 of the power transmission line mesh data is separated from the nearest point 125 by a distance that is shorter than a first reference value. The combination of the mesh 123 and the point 125 is included in the ineligible combinations.

[0073] The display control unit 105 displays the line segment connecting the mesh 123 and the point 125 as an indication of an unsuitable combination, for example, in a yellow solid line.

[0074] A mesh 127 of the power transmission line mesh data is separated from a nearest point 129 by a distance greater than a first reference value but smaller than a second reference value. The combination of the mesh 127 and the point 129 is included in the risky combination.

[0075] The display control unit 105 displays the line segment connecting the mesh 127 and the point 129 as a dangerous combination in a manner different from that of the unsuitable combination. For example, it displays it as a red dashed line.

[0076] In this way, workers at the site can see where the separation distance is insufficient by looking at the displayed line segment. Furthermore, by looking up at the top of the line segment, they can pinpoint the location of the power line, and by following the bottom of the line segment, they can pinpoint the problem location. [Explanation of symbols]

[0077] 1. Distance Processing System 3. Geospatial Information Server 5. Measuring Equipment 7. Distance Processing Device 9 Display device 11 Device communication section 13 Power Line Processing Section 15 Power line memory unit 17 Terrain Processing Section 19 Terrain memory section 21 Distance Processing Unit 23 Ineligible combination storage section 25 Dangerous combination memory unit 27 Display processing section 31 Display communication unit 33 Display control section 35 Display section 101 Display device 103 Position detection unit 105 Display control unit 107 Display section 109 Power Line Memory Unit 111 Terrain memory section 113 Ineligible combination storage section 115 Dangerous Combination Memory Unit

Claims

1. A separation distance processing method using a separation distance between a power line position specified by power line mesh data and a ground position specified by topographical mesh data, comprising: a mesh of the power line mesh data is smaller than a mesh of the topographical mesh data; A step in which a topographical processing unit included in the distance processing device sets, for each mesh in the topographical mesh data, a plurality of points included in the mesh; A distance processing method including a step in which a distance processing unit provided in a distance processing device identifies meshes included in the power line mesh data that have a distance from each point set by the terrain processing unit that is closer than a standard value.

2. 2. The distance processing method according to claim 1, further comprising a step in which a display unit of a display device displays a mesh of the power line mesh data whose distance from at least one point is closer than a reference value, and a point set in the mesh of the topography mesh data that is closest to the mesh by a line segment.

3. The power line identified by the power line mesh data includes a plurality of lateral sway states when the power line sways, The distance processing method according to claim 1 , wherein the distance processing unit identifies, for each lateral sway state, among the meshes included in the power line mesh data, those whose distance from each of the points set by the terrain processing unit is closer than a reference value.

4. The method of claim 1 , wherein the distance between points included in each mesh in the topographical mesh data is the length of one side of the mesh in the power transmission line mesh data.

5. A distance processing device using a distance between a power line position specified by power line mesh data and a ground position specified by topographical mesh data, A terrain processing unit and a separation distance processing unit are provided, a mesh of the power line mesh data is smaller than a mesh of the topographical mesh data; The topographical processing unit sets, for each mesh in the topographical mesh data, a plurality of points included in the mesh; The distance processing unit is a distance processing device that identifies meshes included in the power transmission line mesh data that have a distance from each of the points set by the topography processing unit that is closer than a reference value.

6. A display device comprising a display unit that displays the mesh identified by the separation distance processing unit according to claim 5, The display unit displays a mesh of the power line mesh data whose distance from at least one point is closer than a reference value, and a point set in the mesh of the topography mesh data that is closest to the mesh by a line segment.

7. A program for causing a computer to function as a terrain processing unit and a separation distance processing unit provided in a separation distance processing device using a separation distance between a power line position specified by power line mesh data and a ground position specified by terrain mesh data, a mesh of the power line mesh data is smaller than a mesh of the topographical mesh data; The topographical processing unit sets, for each mesh in the topographical mesh data, a plurality of points included in the mesh; The distance processing unit is a program that identifies meshes included in the power transmission line mesh data that have a distance from each of the points set by the topography processing unit that is closer than a reference value.

Images