Surveying-purpose device, and surveying method

Abstract

To solve the problems in which conventional arts get involved, that is, to provide a surveying-purpose device that uses an external corner or internal corner not only as a surveying reference point, but also as a level reference point (a bench mark), and to provide a surveying method that uses the surveying-purpose device.SOLUTION: A surveying-purpose device according to the present invention comprises: a ruler plate that is made of an L-shaped plate in a plan view; and a supporting cylinder that is installed in a top surface of the ruler plate. The supporting cylinder is arranged almost vertically to the ruler plate. Then, an inner side L-shaped line or an exterior side L-shaped line abuts against an almost vertically intersecting exterior corner or internal corner, and in turn the ruler plate is almost horizontally arranged. In a state with the ruler plate almost horizontally arranged, when inserting a pin of a surveying-purpose reflection prism into an insertion hole, the surveying-purpose reflection prism is arranged almost vertically, and a lower end of the pin abuts against the top surface.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to technology relating to devices used in indoor surveying, and more specifically to a surveying device that can be installed in external or internal corners and a surveying method using the same. [Background technology]

[0002] When constructing buildings such as logistics warehouses and factories, a floor concrete leveling survey (hereinafter referred to as "floor leveling survey") is carried out once the floor concrete has been poured. Traditionally, the mainstream method for carrying out this floor leveling survey has been to carry out a planar coordinate survey using a center line marking on the floor surface as a reference line, and to carry out a leveling survey using ground markings on the pillars.

[0003] Typically, the plane coordinates (X,Y) of the vertex of a column (i.e., a projecting corner) when viewed in plan are known, so by using multiple columns, it is possible to set a reference mark (for example, a relief mark a certain distance away from the column), which means that a plane coordinate system (generally an arbitrary coordinate system) can be set on the floor surface. Furthermore, by setting multiple reference marks that intersect in a checkerboard pattern, it is possible to determine the plane coordinates of the intersection of the reference marks based on various conditions (such as the spacing between the reference marks and the amount of relief from the column face). Then, after aiming a level (for example, an autolevel) at a point with a known height (i.e., a benchmark), such as a ground mark, a box ruler (staff) placed at the intersection of the reference marks is aimed to measure the height at that position.

[0004] In this way, conventional floor level surveying involves determining the planar coordinates by setting a reference mark, then repeatedly calculating the height at each intersection of the reference mark using an auto-level. This requires a two-step process: determining the planar coordinates and then calculating the height at that location. Furthermore, at least two workers are required: one to operate the level and one to operate the staff. Even when it is necessary to determine the planar coordinates of an arbitrary point other than an intersection of the reference marks, two people are required: one to operate the surveying equipment (such as a total station or transit) and one to install a surveying reflector prism (also known as a target) at the measurement point. Meanwhile, surveyors record the results of floor level surveys (i.e., planar coordinates and heights) on drawings or in field notebooks. Furthermore, when displaying the results in computer-aided design (CAD), the operator must manually input the values ​​recorded on the drawings.

[0005] As mentioned above, conventional floor level surveying requires two steps, which is time-consuming and labor-intensive, and requires at least two workers, which means the surveying work is quite costly. Furthermore, the workers have to record the survey results and manually input them into CAD data, both of which are labor-intensive and prone to errors, and these inconveniences are particularly evident in cases where the floor area is large.

[0006] As mentioned above, the planar coordinates of the protruding corners of pillars are usually known. Therefore, if the protruding corners of pillars are used as the surveying reference points, the planar coordinates of any measurement point can be determined, which means that there is no need to set up a grid of reference marks. Specifically, by installing surveying equipment such as a total station or transit and sighting the protruding corners of two pillars, the installation coordinates of the surveying equipment can be obtained, and as a result, the coordinates of any measurement point can be determined.

[0007] However, when using a protruding corner of a pillar as a surveying reference point, the surveying reflector prism must be placed at that corner in a specified orientation (for example, with the pin vertical), but the surveying reflector prism itself becomes an obstacle, making it difficult to place it as desired.Various technologies for using a protruding corner of a pillar as a surveying reference point have been proposed in the past, and for example, Patent Document 1 proposes a surveying device with a sight with a sharp tip, and a first reflecting prism and a second reflecting prism placed at a fixed interval on a straight line. [Prior art documents] [Patent documents]

[0008] [Patent Document 1] Japanese Patent Application Laid-Open No. 2004-053328 Summary of the Invention [Problem to be solved by the invention]

[0009] The technology disclosed in Patent Document 1 can measure the planar coordinates of a pillar's protruding corner, or can use the pillar's protruding corner as a surveying reference point. However, the use of two or more surveying reflecting prisms increases manufacturing costs, and because these surveying reflecting prisms are permanently installed, collimation by automatic tracking is difficult. Furthermore, the surveying device in Patent Document 1 requires the user to maintain a horizontal position while checking a level, which requires manual labor and results in unstable positioning, resulting in unstable surveying accuracy. Furthermore, although planar coordinates can be obtained, height cannot be determined, and a new leveling survey is required, which does not solve the problems of conventional floor level surveying.

[0010] The object of the present invention is to solve the problems of the prior art, that is, to provide a surveying device and a surveying method using the same that allows for the use of external and internal corners as surveying reference points and also as leveling reference points (benchmarks). [Means for solving the problem]

[0011] The present invention was made by focusing on the fact that placing an L-shaped plate material at an outside or inside corner automatically maintains its horizontal position, and is an invention based on an unprecedented idea.

[0012] The surveying device of the present invention is a ruler made of an L-shaped plate in a plan view. Board On the inside of the ruler plate, an inner L-shaped line consisting of two lines that are approximately perpendicular (including vertical) is formed, and on the outside of the ruler plate, an outer L-shaped line consisting of two lines that are approximately perpendicular (including vertical) is formed. Markers are placed on the surface of the ruler board to position the pins of the surveying reflector prism. Then, when the inner L-shaped line is placed on an outside corner that intersects approximately vertically (including vertical), or when the outer L-shaped line is placed on an inside corner that intersects approximately vertically (including vertical), the ruler plate is placed approximately horizontally (including horizontal). can .

[0013] The surveying device of the present invention has two or more ruler plates on the top surface of the ruler plate. marker may also be installed.

[0014] The surveying device of the present invention may also be configured so that a bubble level is provided on the upper surface of the ruler plate.

[0015] The surveying device of the present invention may further include a wall plate. This wall plate is arranged approximately vertically (including perpendicularly) to the ruler plate and is attached to the inner L-shaped line of the ruler plate. In this case, when the inner L-shaped line is abutted against a pillar having an external corner that intersects approximately vertically (including perpendicularly), the wall plate abuts against the wall surface of the pillar.

[0016] The surveying method of the present invention is a method for obtaining the coordinates of any point using the surveying device of the present invention, and is a method comprising a first placement step, a first collimation step, a second placement step, a second collimation step, an installation position calculation step, and a coordinate obtaining step. Among these, in the first placement step, the surveying device is placed so that the inner L-shaped line of the surveying device abuts on a first protruding corner that intersects the device approximately perpendicularly (including perpendicularly), or the outer L-shaped line of the surveying device abuts on a first recessed corner that intersects the device approximately perpendicularly (including perpendicularly). In the first collimation step, with the ruler plate abutting on the first protruding corner (or the first recessed corner), the pin of the surveying reflecting prism is aligned. Place on marker Similarly, in the second positioning step, the surveying device is positioned so that it abuts against a second outside corner that intersects the inner L-shaped line of the surveying device at a substantially perpendicular angle (including perpendicular) (or a second inside corner that intersects the outer L-shaped line of the surveying device at a substantially perpendicular angle (including perpendicular)), and in the second collimation step, the pin of the surveying reflector prism is aligned with the ruler plate in a state where the ruler plate is abutted against the second outside corner (or the second inside corner). Place on marker At the same time, the surveying reflector prism is collimated by the surveying equipment. In the installation position calculation process, the coordinates of the installation position of the surveying device are calculated based on the measurement results obtained in the first collimation process and the second collimation process. Then, in the coordinate acquisition process, the surveying reflector prism is placed at an arbitrary measurement point, and the surveying reflector prism is collimated by the surveying equipment to acquire the coordinates of the measurement point. When a ruler plate is placed on the first external corner (or the first internal corner), marker The center coordinates of are known, and when a ruler plate is placed on the second outside corner (or the second inside corner), marker The center coordinates of are assumed to be known. [Effects of the Invention]

[0017] The surveying device and surveying method of the present invention have the following advantages. (1) The reference plane coordinates and reference height can be obtained by a single sighting using a surveying instrument, and as a result, floor level surveying can be carried out more efficiently than before. (2) By simply abutting the inner L-shaped line or outer L-shaped line against the protruding or recessed corner, the ruler board can be stably maintained in a roughly horizontal (including horizontal) position, resulting in the acquisition of surveying results with stable accuracy. (3) By using surveying equipment, there is no need to record the survey results on drawings etc. on-site, and they can be automatically converted into CAD data without manual input. (4) Furthermore, by using an automatic tracking type surveying instrument, floor level surveying can be carried out by a single worker. [Brief explanation of the drawings]

[0018] [Figure 1] 1 is a perspective view schematically showing a surveying device according to the present invention; [Figure 2] (a) is a plan view of the surveying device seen from above, and (b) is a side view of the surveying device seen from the side. [Figure 3] FIG. 10 is a side view schematically showing a surveying device supporting a surveying reflecting prism in a state of contact with a pillar. [Figure 4] FIG. 10 is a perspective view showing a surveying device arranged so that the inner L-shaped line of the ruler plate abuts against a corner. [Figure 5] FIG. 1 is a perspective view showing a surveying device arranged so that the outer L-shaped line of the ruler plate abuts against an inside corner. [Figure 6] FIG. 10 is a plan view schematically showing a ruler board on which markers are placed. [Figure 7] FIG. 10 is a plan view for explaining an example of surveying in which the surveying device 100 is placed at a corner of a pillar. [Figure 8] 1 is a flowchart showing the main steps of the surveying method of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0019] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A surveying device and a surveying method according to an embodiment of the present invention will be described with reference to the accompanying drawings.

[0020] 1.Surveying equipment First, the surveying device of the present invention will be described in detail. The surveying method of the present invention is a method for mainly conducting indoor surveys using the surveying device of the present invention. Therefore, the surveying device of the present invention will be described first, and then the surveying method of the present invention will be described.

[0021] FIG. 1 is a perspective view showing a typical example of a surveying device 100 according to the present invention. As shown in this figure, the surveying device 100 according to the present invention includes: Ruler board 110 and Support tube 120 and wallboard 130 、 A spirit level 140 may also be included.

[0022] Ruler board 110 As shown in Fig. 2(a), the ruler plate 110 is L-shaped in plan view, and is a thin, plate-like member as shown in Fig. 2(b). Fig. 2(a) is a plan view of the surveying device 100 seen from above, and Fig. 2(b) is a side view of the surveying device 100 seen from the side. An inner L-shaped line IL consisting of two substantially perpendicular (including vertical) line segments is formed on the inside of the ruler plate 110 (upper left side in the figure), and an outer L-shaped line OL consisting of two substantially perpendicular (including vertical) line segments is formed on the outside thereof (lower right side in the figure).

[0023] The support tube 120 supports the surveying reflector prism PR as shown in Fig. 3, and is a member including a main body 121 (Fig. 1) and an insertion hole 122 (Fig. 1) provided in the center of the main body. Fig. 3 is a side view showing a schematic diagram of the surveying device 100 supporting the surveying reflector prism PR in a state of abutting against a pillar. The support tube 120 has an insertion hole 122. Ruler board 110 so that it is approximately perpendicular (including perpendicular) to Ruler board 110 The insertion hole 122 penetrates the entire length of the main body 121, so that when the pin of the surveying reflector prism PR is inserted into the insertion hole 122, the lower end of the pin Ruler board 110 The upper surface of the

[0024] The support tube 120 is Ruler board 110However, depending on the location, the support tube 120 (i.e., the surveying reflecting prism PR) may be located in a position that is difficult to sight from the surveying instrument. Therefore, in order to increase the options for installing the surveying reflecting prism PR, Ruler board 110 The support tubes 120 may be installed at two or more of these locations.

[0025] The wall panel 130 is, as shown in FIG. 1 and FIG. 2(b), Ruler board 110 so that it is approximately perpendicular (including perpendicular) to Ruler board 110 The wall panel 130 is a plate-like member attached along the inner L-shaped line IL on the underside of the wall panel 130. The wall panel 130 is attached along the entire length of the inner L-shaped line IL (i.e., with an extension equal to the length of the inner L-shaped line IL). Ruler board 110 The wall panel 130 can be attached to the wall panel 130 itself, or to each of the two lines forming the inner L-shaped line IL. Ruler board 110 The wall panel 130 can be fixed to the wall or can be detachably attached. Ruler board 110 Furthermore, the wall panel 130 can be attached along the outer L-shaped line OL instead of (or in addition to) the inner L-shaped line IL.

[0026] The surveying device 100 is used by positioning the inner L-shaped line IL of the ruler plate 110 so that it abuts against an outside corner, as shown in Fig. 4, or by positioning the outer L-shaped line OL of the ruler plate 110 so that it abuts against an inside corner, as shown in Fig. 5. For example, as shown in Fig. 3, when the wall plate 130 (i.e., the inner L-shaped line IL) is abutted against an outside corner of a pillar where two approximately vertical planes (including vertical planes) intersect approximately perpendicularly (including vertical), the ruler plate 110 becomes approximately horizontal (including horizontal) and the insertion hole 122 of the support cylinder 120 becomes approximately vertical (including vertical). As a result, the surveying reflecting prism PR with its pin inserted into the insertion hole 122 becomes approximately vertical (including vertical), that is, the surveying reflecting prism PR can indicate the planar position (X, Y) of the bottom end of the pin. Furthermore, if the surveying device 100 is positioned so that the top surface of the ruler plate 110 is at a marking line on a pillar (for example, a marking line 1 m higher than the floor), the surveying reflecting prism PR can indicate the height (Z) of the marking line using the bottom end of the pin.

[0027] Incidentally, when the wall panel 130, which is disposed approximately vertically (including vertically), abuts against an external or internal corner where two approximately vertical wall surfaces (including vertical wall surfaces) intersect approximately vertically (including vertically), the wall panel 130 becomes approximately vertical (including vertically) and the ruler plate 110 becomes approximately horizontal (including horizontal). In other words, when two movable surfaces that intersect perpendicularly are abutted against two fixed surfaces that intersect perpendicularly, the orientations of these movable surfaces are determined by the fixed surfaces; for example, if the fixed surfaces are vertical, the movable surfaces are also vertical. On the other hand, when two line segments that intersect perpendicularly are abutted against two fixed surfaces that intersect perpendicularly, the orientations of these line segments are not determined by the fixed surfaces. In other words, the orientation of the ruler plate 110 is not determined simply by abutting the inner L-shaped line IL or the outer L-shaped line OL against two fixed surfaces that intersect perpendicularly. However, because the ruler plate 110 is a plate material, a wall surface (hereinafter referred to as the "thick surface") is formed in the thickness direction, and normally this thick surface and the top and bottom surfaces of the plate material are approximately perpendicular (including vertical). Therefore, even if the wall plate 130 is omitted, if the inner L-shaped line IL is positioned so as to abut against an outside corner (or the outer L-shaped line OL is positioned so as to abut against an inside corner), the ruler plate 110 will be approximately horizontal (including horizontal), and the insertion hole 122 of the support tube 120 will be approximately vertical (including vertical).

[0028] As described above, if the inner L-shaped line IL is positioned so that it abuts an outside corner (or the outer L-shaped line OL is positioned so that it abuts an inside corner), the ruler plate 110 will be approximately horizontal (including horizontal). However, the operator placing the surveying device 100 may want to confirm that the ruler plate 110 is approximately horizontal (including horizontal). In this case, it is recommended to provide an air bubble level 140 on the top surface of the ruler plate 110, as shown in Figures 1 and 2.

[0029] The support tube 120 can support the surveying reflector prism PR, which means there is no need to secure an operator to hold the surveying reflector prism PR, which is advantageous in that it saves labor. However, providing the support tube 120 increases the overall size of the surveying device 100, making it somewhat difficult to handle and store, and also increases the number of parts, resulting in somewhat higher manufacturing costs. Therefore, as shown in Figure 6, it is possible to install markers 150 on the ruler plate 110 and omit the support tube 120. In this case, since an operator must set the surveying reflector prism PR at the marker 150 position so that it is in a vertical position, it is necessary to secure an operator, but the surveying device 100 becomes more compact and manufacturing costs can be reduced. Of course, as with the support tube 120, the markers 150 can be installed in only one location or in two or more locations.

[0030] An example of using the surveying device 100 will be described below with reference to FIG. 7. FIG. 7 is a plan view illustrating an example of conducting a survey by placing the surveying device 100 at the protruding corner of a pillar. Normally, when conducting indoor surveying such as floor level surveying, planar coordinates (often an arbitrary coordinate system) are set in the room. In this case, it is common to set two orthogonal axes (X-axis and Y-axis) along the wall surfaces that make up the pillar, as shown in FIG. 7. Furthermore, the planar coordinates of the protruding corner of the pillar are known, meaning that they can be used as a planar reference point. Furthermore, the height of a ground mark (for example, a mark 1 m higher than the floor) set on the pillar is known, meaning that they can be used as an elevation reference point (benchmark).

[0031] On the other hand, the center point of the insertion hole 122 of the ruler plate 110 and the center point of the marker 150 (i.e., the planar position indicated by the surveying reflecting prism PR) are known in advance as positions based on the corner of the inner L-shaped line IL (the connection point of the two line segments) and the corner of the outer L-shaped line OL. Therefore, when the ruler plate 110 is positioned so that the inner L-shaped line IL abuts the outside corner (or so that the outer L-shaped line OL abuts the inside corner) and then the surveying reflecting prism PR is inserted into the insertion hole 122 (or set at the marker 150 position), the positional relationship between the planar position of the surveying reflecting prism PR and the planar position of the outside corner of the pillar becomes clear. For example, in Figure 7, the planar coordinates of the protruding corner of the pillar are (X1, Y1), and the center point of the insertion hole 122 is (δX, δY) away from the corner of the inner L-shaped line IL, so the planar position indicated by the surveying reflector prism PR is (X1-δX, Y1-δY). In this way, by using the surveying device 100, the position of the surveying reflector prism PR can be used as a planar reference point, and further, by aligning the ruler board 110 with the land line, the height of the surveying reflector prism PR can be used as a benchmark.

[0032] 2.Surveying method Next, the surveying method of the present invention will be explained with reference to Figure 8. The surveying method of the present invention is a method for mainly conducting indoor surveying using the surveying device 100 explained so far, and therefore we will avoid explanations that overlap with the contents explained for the surveying device 100 and will only explain the contents unique to the surveying method of the present invention. In other words, the contents not mentioned here are the same as those explained in "1. Surveying device".

[0033] Figure 8 is a flow diagram showing the main steps of the surveying method of the present invention. As shown in this figure, the surveying method of the present invention can be broadly divided into a "pre-process" and a "measurement process" enclosed by dashed lines. Of these, the pre-process is a process for determining the position where a surveying instrument such as a total station is installed. The pre-process will be explained in detail below.

[0034] First, an operator sets up a surveying instrument at a desired position. Then, the operator places the surveying device 100 at the first outside corner (or the first inside corner) and inserts the surveying reflecting prism PR into the insertion hole 122 (Step 211). At this time, as described above, the surveying device 100 is placed so that the inner L-shaped line IL abuts the outside corner (or the outer L-shaped line OL abuts the inside corner). Once the surveying device 100 is placed at the first outside corner (or the first inside corner), the surveying reflecting prism PR is collimated using the surveying instrument (Step 212). Note that the surveying can be carried out by two operators, one who collimates the surveying instrument and the other who keeps the surveying device 100 in place, or by one operator using an automatic tracking surveying instrument. The same worker installs the surveying device 100 and then places the surveying device 100 one by one, that is, the worker performs the surveying work alone.

[0035] After collimating the surveying reflector prism PR set at the first outside corner (or first inside corner), the operator places the surveying device 100 at the second outside corner (or second inside corner) and inserts the surveying reflector prism PR into the insertion hole 122 (Step 213). Then, after placing the surveying device 100 at the second outside corner (or second inside corner), the operator collimates the surveying reflector prism PR using the surveying instrument (Step 214). The first collimation step (Step 212) obtains the angle (azimuth angle) and distance between the installation position of the surveying instrument and the first outside corner (or first inside corner), and similarly, the second collimation step (Step 214) obtains the angle (azimuth angle) and distance between the installation position of the surveying instrument and the second outside corner (or second inside corner). This makes it possible to calculate the installation position of the surveying instrument (Step 215). Furthermore, by aligning the top surface of the ruler board 110 with the line mark of the pillar at either the first outside corner (or the first inside corner) or the second outside corner (or the second inside corner) (or both), and then placing the surveying device 100, the installation height of the surveying equipment can also be determined.

[0036] Once the preliminary steps are completed, the measurement step is carried out. Specifically, an operator installs the surveying reflector prism PR at a desired measurement point and then collimates the surveying reflector prism PR using a surveying instrument (Step 221). At this time, the operator installs the surveying reflector prism PR as usual, without using the surveying device 100. Then, using the results of the surveying instrument collimating the surveying reflector prism PR, the plane coordinates and height of the measurement point are calculated (Step 222). By repeatedly performing this arbitrary point collimation step (Step 221), the plane coordinates and heights of multiple measurement points can be obtained. [Industrial Applicability]

[0037] The surveying device and surveying method of the present invention can be used for surveying various buildings with external and internal corners (especially for indoor surveying), such as logistics warehouses and factories. In addition to floor level surveying, they can also be used to survey the horizontal position and height of various facilities. [Explanation of symbols]

[0038] 100 Surveying device of the present invention 110 (surveying equipment) ruler 120 (Surveying equipment) support tube 121 (Support tube) main body 122 (Support tube) insertion hole 130 (surveying equipment) wallboard 140 Level (for surveying equipment) 150 (surveying equipment) marker IL (surveying equipment) inner L-shaped line OL (surveying equipment) outer L-shaped line PR Surveying Reflector Prism

Claims

1. A ruler plate made of an L-shaped plate in a plan view is provided, An inner L-shaped line consisting of two vertical or approximately vertical line segments is formed on the inside of the ruler plate, and an outer L-shaped line consisting of two vertical or approximately vertical line segments is formed on the outside of the ruler plate, Markers for arranging pins of a surveying reflecting prism are provided on the surface of the ruler plate; When the inner L-shaped line is abutted against an outside corner that intersects vertically or approximately vertically, or when the outer L-shaped line is abutted against an inside corner that intersects vertically or approximately vertically, the ruler plate is arranged horizontally or approximately horizontally. A surveying device characterized by:

2. Two or more of the markers are placed on the upper surface of the ruler plate.

2. The surveying device according to claim 1.

3. A bubble level is provided on the upper surface of the ruler plate.

3. The surveying device according to claim 1 or 2.

4. Further provided is a wall plate arranged perpendicular or substantially perpendicular to the ruler plate and attached to the inner L-shaped line of the ruler plate; When the inner L-shaped line is abutted against a column having an external corner that intersects perpendicularly or approximately perpendicularly, the wall panel abuts against the wall surface of the column.

4. The surveying device according to claim 1, wherein the first and second sensors are connected to the first and second sensors.

5. A method for acquiring coordinates of an arbitrary point using the surveying device according to any one of claims 1 to 4, comprising: a first disposing step of disposing the surveying device so that the surveying device abuts against a first outside corner that intersects the inner L-shaped line perpendicularly or approximately perpendicularly, or a first inside corner that intersects the outer L-shaped line perpendicularly or approximately perpendicularly; a first collimation step of arranging pins of the surveying reflector prism on the markers while the ruler plate is in contact with the first outside corner or the first inside corner, and collimating the surveying reflector prism with a surveying instrument; a second placement step of placing the surveying device so that the surveying device abuts against a second outside corner that intersects the inner L-shaped line perpendicularly or approximately perpendicularly, or a second inside corner that intersects the outer L-shaped line perpendicularly or approximately perpendicularly; a second collimation step of arranging pins of the surveying reflector prism on the markers while the ruler plate is in contact with the second outside corner or the second inside corner, and collimating the surveying reflector prism with the surveying instrument; an installation position calculation step of calculating coordinates of an installation position of the surveying device based on the measurement results obtained in the first collimation step and the measurement results obtained in the second collimation step; a coordinate acquisition step of arranging the surveying reflecting prism at an arbitrary measurement point and acquiring coordinates of the measurement point by collimating the surveying reflecting prism with the surveying instrument, When the ruler plate is brought into contact with the first outside corner or the first inside corner, the center coordinates of the marker are made known, and when the ruler plate is brought into contact with the second outside corner or the second inside corner, the center coordinates of the marker are made known. A surveying method characterized by:

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