JP2007248214A - Horizontal angle measuring method and position measuring method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a horizontal angle measuring method and a position coordinate measuring method, enabling even an unskilled person to readily and accurately measure in the evening or in bad weather. <P>SOLUTION: A laser light emitting device 1 for radiating a horizontal laser beam T toward, for example, the inside of a prescribed azimuth angle range or the whole azimuth is installed on a survey point P1, by using one point on a vertical line passing the survey point P1 as the radiation center BO. A condensing imaging device, such as a CCD camera 2 having a condensing lens 12 and an image face 13, is installed on an installation point A1, rotatably around a vertical rotation axial core O2. The CCD camera 2 is rotated about the rotation axial core O2 on the installation point A1, and coincidence of an optical axis J of the condensing lens 12 with the radiation center BO of the laser beam T is detected by image formation of the laser beam on a prescribed position on the image face 13, for example, the coordinate origin G, and a horizontal angle around the installation point A1 between another survey point, a known point, a reference azimuth or a reference line passing the installation point, and the survey point P1 is determined. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

The present invention relates to a method for measuring a horizontal angle between measurement points or between a measurement point and a known point, and a method for measuring the position of a plane coordinate using the measurement method for the horizontal angle.

  Conventionally, when measuring a horizontal angle between stations or between a station and a known point, when there is no target at the position corresponding to the station and only the benchmark is marked on the ground, the station A measurement pole such as a survey pole is set on the top, and the operator measures the horizontal angle between the measuring points, etc. by collimating the measurement target with a scale such as a transit. The position of the measuring point on the plane coordinate is measured.

  FIG. 10 is a diagram showing a conventional horizontal angle and plane coordinate position measurement method (triangulation) using the survey pole 101 and the transit 102. In FIG. 10, two installation points A1 and A2 are set for one measurement point P1, and the distance D between both installation points A1 and A2 and the plane coordinates of both installation points A1 and A1 are set. The position is measured in advance. Under such conditions, the horizontal angles θ1 and θ2 of the measuring point P1 collimated from each of the installation points A1 and A2 and the position of the measuring point P1 are obtained with respect to the reference line E connecting the two installation points A1 and A2. It is.

  The working method will be described in detail. The operator rotates the transit 102 around the vertical axis of rotation while looking into the transit 102 and collimates the surveying pole 101, thereby colliding the horizontal angle θ1 at the time of collimation and Each θ2 is obtained. And the position on the plane coordinate of the measuring point P1 is calculated | required from those angles (theta) 1 and (theta) 2 and the known distance D between installation point A1, A2.

  However, in the measurement method as shown in FIG. 10, the operator collimates the survey pole 101 while looking into the transit 102. Therefore, the distance from the installation points A1, A2 to the measurement point P1 when the evening is dim, when the weather is bad, or when the weather is bad. Is long, it is difficult to visually recognize the survey pole 101, and it is impossible to accurately collimate and measure. That is, the measurement accuracy greatly depends on the surveying environment, and the measurement accuracy greatly depends on the skill level of the operator.

  In place of the survey pole 101, there is a method of installing a gauge having a light emitting body such as a light bulb or LED on the measuring point P1 so that the measurement can be performed even in the dark in the evening. Since the energy of the light source is weak, when the distance between the measuring point P1 and the installation points A1 and A2 is long, the light does not reach the transit 102 sufficiently, and the surveying pole 101 appears blurred, and improvement in measurement accuracy cannot be expected. (Patent Document 1).

(Object of invention)
The purpose of the present invention is accurate even when the surveying environment is not good, for example, when it is dim in the evening, when the weather is bad, or when the distance from the installation point to the measuring point is long, or even if it is an unskilled person. It is to provide a horizontal angle measuring method and a position measuring method capable of measuring a horizontal angle between measuring points or between a measuring point and a known point.
Japanese Patent Application Laid-Open No. 2004-117184.

  In order to solve the above-mentioned problem, the invention described in claim 1 is directed to a laser light emitting device that emits a horizontal laser beam over a predetermined azimuth range with a point on a vertical line passing through a measurement point as a radiation center. A condensing imager that forms a condensing object on an image surface by a condensing lens, and is installed at an installation point so as to be rotatable around a vertical rotation axis, and the condensing imager is installed at the installation point. Rotating around the axis of rotation of the light beam, the fact that the optical axis of the condenser lens coincides with the emission center of the laser beam is detected by forming an image of the laser beam at a predetermined position on the image plane. Then, a horizontal angle around the installation point with another measurement point, a known point, a reference orientation or a reference line passing through the installation point and the measurement point is obtained.

  According to this, in the operation of matching the optical axis of the condensing lens of the condensing imager with the radiation center of the laser light emitting device, that is, the operation equivalent to the conventional collimation operation, it is sequentially connected from a position away from the predetermined position. Since the change in which the image approaches the predetermined position can be reliably recognized, the state in which the image formation reaches the predetermined position can be detected easily and reliably, and the work efficiency and accuracy are improved.

  In addition, since it uses a laser beam that is straight and has high energy, it can be measured accurately even in the dim evening or in bad weather. The image is clear, so that even a remote measuring point can be measured reliably.

  Furthermore, compared to a method using a surveying pole or the like, it is not necessary to arrange an auxiliary worker such as holding a pole at the measuring point, and labor saving can be achieved.

  According to a second aspect of the present invention, in the horizontal angle measuring method according to the first aspect, the laser light emitting device emits a horizontal laser beam in all directions with a point on the vertical line passing through the measurement point as a radiation center. Device.

  According to this, since the laser light emitting device emits a horizontal laser beam in all directions, there is no need to consider the orientation of the installation point of the condensing imager when installing the laser light emitting device on the measuring point. Installation work is easy. Also, any range of horizontal angles can be easily measured.

  According to a third aspect of the present invention, a laser light emitting device that emits one or a bundle of linear laser beams in a horizontal direction perpendicular to a point on a vertical line passing through a measuring point is provided at the measuring point so as to be rotatable around the vertical line. A condensing imager that forms a condensing object on an image surface by a condensing lens is installed at an installation point so as to be rotatable around a vertical rotation axis, and the condensing imager is installed at the installation point. The laser beam is rotated around the axis of rotation and the laser light emitting device is rotated about the vertical line, and the optical axis of the condenser lens coincides with the laser beam. By this detection, a horizontal angle around the installation point between another measurement point, a known point, a reference orientation or a reference line passing through the installation point and the measurement point is obtained.

  According to this, since it uses a laser beam that is straight and has high energy as a measuring standard, it can measure with high accuracy even in the dim evening or in bad weather. The above image is clear, so that even a remote measuring point can be measured reliably.

  Furthermore, compared to a method using a surveying pole or the like, it is not necessary to arrange an auxiliary worker such as holding a pole at the measuring point, and labor saving can be achieved.

  According to a fourth aspect of the present invention, in the horizontal angle measuring method according to any one of the first to third aspects, a motor that rotates the condensing imager around a rotation axis, and An angle measuring device for detecting a rotation angle around the rotation axis, and connecting the image plane, the motor and the angle measuring device to a controller, wherein the controller is a horizontal position of image formation of the laser beam on the image plane. Based on the information, the rotation angle of the condensing imager is controlled by the motor so that the imaging of the laser beam is at the predetermined position.

  According to this, since the measurement operation for matching the optical axis of the condensing lens with the radiation center of the laser light emitting device can be automatically performed, even an unskilled person can perform the measurement easily and accurately. Further, unlike the method of collimating the target directly with the eyes such as transit, it is not necessary to see the laser beam directly with the eyes, so that the operator's eyes are not adversely affected and the safety is excellent.

  According to a fifth aspect of the present invention, in the horizontal angle measuring method according to any one of the first to fourth aspects, the image plane is configured by arranging a large number of CCD image sensor elements.

  According to this, the image plane can be easily connected to the controller, and a commercially available CCD image sensor can be used, so that the cost can be suppressed.

  According to a sixth aspect of the present invention, in the horizontal angle measuring method according to the fifth aspect, a monitor is connected to the controller, and an image formed on the image plane formed by the CCD image sensor element is displayed on the monitor in a visible manner. .

  According to this, the rotation angle of the condensing imager is automatically controlled, and at the same time, the operator can easily check the progress of the work by using the monitor.

  According to the seventh aspect of the present invention, with respect to one measuring point, the condensing imager is installed at two or more installation points, and any two installations are performed by the method according to any one of the first to sixth aspects. A horizontal angle of the measurement point with respect to a reference line connecting the points is obtained, and a position on the plane coordinate of the measurement point is obtained from the distance between the installation points and the measured horizontal angles.

[First embodiment of the present invention]
1 to 7 show an embodiment of a horizontal angle measuring method and a position measuring method according to the present invention using a laser ring beam, which will be described with reference to these drawings.

  FIG. 1 is a perspective view showing an example of each measuring instrument during horizontal angle measurement. The laser light emitting device 1 is used as a measurement target installed at the measurement point P1, and a CCD as a condensing imager installed at the installation point A1 or the like. The camera 2 is used. The laser light emitting device 1 includes a cylindrical device main body 3 extending in the vertical direction and three leg portions 4 extending from the device main body 3 and adjustable in height. A laser oscillator 5 that oscillates a laser beam up and down, a rod prism (cylindrical ring beam generating optical element) 6 that converts a laser beam oscillated upward from the laser oscillator 5 into a horizontal laser ring beam B, and not shown. Built-in gyro-type self-horizontal holding function. A window hole 8 is formed at the upper end of the apparatus body 3 from which a large number of laser beams T constituting the laser ring beam B are emitted in all directions (range of 360 °) in a horizontal plane.

  When the laser light emitting device 1 is installed on the ground or the like, the laser ring beam B of the laser beam T is leveled by the self-horizontal holding mechanism, and the centripetal laser beam Tc oscillated downward from the laser oscillator 5 is vertically downward. The posture is automatically adjusted so as to be suitable for.

  The CCD camera 2 includes at least a convex condensing lens 12 and an image surface 13 on which an image of a condensing object is formed by the condensing lens 12, and a pedestal by a vertical rotation shaft 14. 15 is supported so as to be rotatable about a rotation axis O2. The pedestal 15 is supported by three legs 20 with adjustable heights, and includes a centripetal lowering swing 21 and a level (not shown). The rotating shaft 14 is connected to a vertical output shaft of a motor 16 fixed to a pedestal 15, and the motor 16 detects the rotation angle of the rotating shaft 14, that is, the rotation angle around the rotation axis O 2 of the CCD camera 2. For example, an encoder 17 is provided as an angle measuring device. The image surface 13 of the CCD camera 2 has a structure in which a number of CCD image sensor elements are arranged in a matrix, for example, and is preferably disposed on the rotation axis O2.

  The image plane 13, the encoder 17, and the motor 16 are electrically connected to a controller 25, and a monitor 26 is electrically connected to the controller 25.

  FIGS. 4 and 5 are enlarged views of the image plane 13, which correspond to the view of arrow IV in FIG. 2 and the view of arrow V in FIG. 3, respectively, and form images M0 and M1 through the rear of the CCD camera 2. Shown in the state. On the image plane 13, camera coordinates including a horizontal X-axis and a vertical Y-axis are formed, and symbol G indicates a coordinate origin where the XY axes intersect.

  FIG. 3 shows the positional relationship among the laser ring beam B, the condensing lens 12 and the image plane 13 when the horizontal angle measurement is completed. J is the optical axis of the condensing lens 12, and F is the condensing lens 12. Is the focus. When the optical axis J coincides with the radiation center B0 of the laser ring beam B, an image M0 is formed at the coordinate origin G around the laser beam T1 coincident with the optical axis J. That is, the origin G of the XY coordinates is, as a general rule, a predetermined position that is a target for the measurement target detection.

[Overview of control]
FIG. 2 shows a state where the optical axis J of the condenser lens 12 does not coincide with the radiation center B 0 of the laser ring beam B. In FIG. 2, from the image plane 13, the center position of the image formation M1 on the camera coordinates, particularly the position information in the horizontal direction (position in the X-axis direction) is input to the controller 25, and from the encoder 17 (FIG. 1). Information on the rotation angle from the reference rotation angle of the motor 16 (for example, a rotation angle of 0 °) is input to the controller 25.

  The memory of the controller 25 stores an angle (deviation angle) α between the laser beam passing through the focal point F and the optical axis J, a necessary rotation amount of the motor 16 corresponding to the deviation angle α, and the X axis of each image plane 13. A correlation expression or a correlation map with coordinates (horizontal direction coordinates) is written in advance. According to the correlation equation and the like, when the distance d in the X-axis direction from the coordinate origin G to the center of the imaging M1 is reduced, the deviation angle α and the necessary rotation amount of the motor 16 are reduced with a certain relationship, as shown in FIG. As described above, when the image M0 is formed on the coordinate origin G and the distance d becomes zero, the angle α and the necessary rotation amount of the motor 16 become zero.

  In order to achieve the above control, a calculation unit such as a CPU of the controller 25 is based on the image formation position information from the image plane 13, and the deviation angle α, the direction of deviation, and the necessary rotation of the motor 16 based on the correlation equation. An amount is obtained, and a rotation drive signal (a rotation direction and rotation amount signal) is output to the motor 16 so that the deviation angle α approaches 0. Preferably, in addition to the rotation direction and the rotation amount, for example, the rotation speed may be controlled in proportion to the size of the distance d between the image formation M1 and the coordinate origin G. For example, the control signal for decreasing the rotation speed is generated as the image formation M1 approaches the coordinate origin G.

  In the present embodiment, the predetermined position is not limited to the coordinate origin G of camera coordinates, and may be a position where at least the X-axis coordinate is zero. That is, as shown by the phantom line in FIG. 5, near the coordinate origin G so that it can be detected even if there is a weak difference between the height of the laser ring beam B in FIG. 1 and the height of the optical axis J of the CCD camera 2. The image forming M0 ′ on the Y axis (X axis coordinate is 0) is also configured to be recognized by the controller 25 as a state in which the optical axis J coincides with the radiation center B0.

[How to measure the horizontal angle between two measuring points]
FIG. 6 shows a method of measuring the horizontal angle θ0 around the installation point A1 of the two measurement points P1 and P2 using the laser light emitting device 1 and the CCD camera device 2 shown in FIG.

(1) In FIG. 6, the laser light emitting device 1 is installed at each of the measurement points P1 and P2, and the CCD camera 2 is installed at an arbitrary position A1. When the laser light emitting device 1 is installed, the downward vertical laser beam Tc is made to coincide with the measuring point P1 (or P2) as shown in FIG. Thereby, the radiation center B0 of the ring beam B is located on the vertical line O1 passing through the measuring point P1. In addition, the CCD camera 2 adjusts the centripetal force with the downward swing 21 so that the rotational axis O2 coincides with the installation point A1, and adjusts the horizontal posture with a level so that the rotational axis O2 is vertical, Further, the height is adjusted so that the optical axis J substantially coincides with the height of the ring beam B of the laser light emitting device 1.

(2) The measurement operation is started by turning on the controller 25 and the like with the optical axis J of the CCD camera 2 substantially directed to the first measurement point P1 side.

(3) Although an image of a laser beam is formed on the image surface 13 of the CCD camera 2, at the beginning of the measurement, the optical axis J of the CCD camera 2 is from the radiation center B0 of the laser ring beam B as shown in FIG. The image M1 of the laser beam is formed on the image plane 13 at a position away from the coordinate origin G in the X-axis direction.

(4) FIG. 4 shows the state of the image plane 13 corresponding to the state of FIG. 2, and the image M1 is formed at a position away from the coordinate origin G in the positive direction of the X axis, for example, by a distance d. The image is blurred and large. The position of the X-axis coordinate at the center of the image M1 is input to the controller 25. As described above, the calculation unit obtains the shift angle α and the shift direction in FIG. A rotation drive signal (a rotation direction and rotation amount signal) is output to the motor 16 so as to approach 0.

(5) The output signal causes the output shaft of the motor 16 to rotate by a predetermined amount in a predetermined rotation direction. That is, in FIG. 2, the CCD camera 2 rotates by a predetermined amount in the arrow S1 direction. During this rotation control, the image M1 on the image plane 13 does not disappear from the image plane 13 and approaches the coordinate origin G as the CCD camera 2 rotates.

(6) If the optical axis J of the CCD camera 2 coincides with the radiation center B0 of the laser ring beam B as shown in FIG. At the same time, a laser beam image M0 is formed at the coordinate origin G as shown in FIG. Thus, when it is detected that an image is formed at the coordinate origin G, the rotation of the CCD camera 2 is stopped, and the rotation angle from the reference rotation angle (for example, rotation angle 0 °) is read by the encoder 17, and the memory etc. To remember.

(7) Next, as shown by the phantom lines in FIG. 6, the measuring operation similar to the measuring operation of the first measuring point P1 with the optical axis J of the CCD camera 2 substantially directed to the second measuring point P2 side. Thus, the rotation angle from the reference rotation angle (rotation angle 0 °) at the second measurement point P2 is read and stored in a memory or the like.

(8) Then, due to the difference between the rotation angle from the reference rotation angle of the first measurement point P1 and the rotation angle from the reference rotation angle of the second measurement point P2, between the two measurement points P1 and P2 The horizontal angle θ0 around the installation point A1 is obtained.

  In the process of controlling the rotation from the state shown in FIG. 2 to the state shown in FIG. 3, the CCD camera 2 may stop and rotate in the direction of arrow S1 from the state shown in FIG. The rotation is controlled in the direction of the arrow S2 opposite to the rotation control and converges to the state of FIG. When the over-rotation is again made in the direction of the arrow S2, the rotation is further controlled in the direction of the arrow S1, and the state converges to the state shown in FIG.

[Position measurement method on plane coordinates]
FIG. 7 shows a method for obtaining the position on the plane coordinate of one measuring point P1 using the laser light emitting device 1 and the CCD camera device 2 shown in FIG. It is a method corresponding to so-called conventional triangulation.

(1) In FIG. 7, two installation points A1 and A2 are set for one measuring point P1, and the positions of both installation points A1 and A2 on the plane coordinates and between the two installation points A1 and A2 The distance D is measured in advance.

  Using the CCD camera 2 installed at each installation point A1, A2, the angle of the measurement point as seen from each installation point A1, A2 with respect to the reference line E connecting both installation points A1, A2, in the same manner as the horizontal angle measuring method. That is, the angles θ1 and θ2 are obtained, and the information on the angles is input to the controller 25 in FIG. 1, and the information on the angles θ1 and θ2, the known distance D between the installation points A1 and A2, and the known both installations. From the coordinates on the plane of the points A1 and A2, the position coordinates of the measuring point P1 are obtained.

[Second embodiment of the present invention]
FIG. 8 shows a second embodiment of the present invention. The configuration different from that of the first embodiment described with reference to FIGS. 1 to 7 is that the laser light emitting device 31 has a predetermined orientation smaller than 360 °. This is the structure in which the laser beam T is emitted over the entire area in the angular range θw. The predetermined azimuth angle range θw can be set to an arbitrary range such as 30 °, 45 °, 90 ° 180 °, 240 °, and the like.

  Other configurations of the laser light emitting device 1 and the configuration of the CCD camera 2 (condenser imager) are the same as those in the first embodiment, and the same parts and portions are denoted by the same reference numerals and description thereof is omitted.

  The measuring method of the horizontal angle between two measuring points and the measuring method of the position of the measuring point by triangulation are the same as the method explained in FIG. 6 and FIG. 7 of the first embodiment, but the laser emitting device 1 Is set such that the installation point A1 is included in the azimuth angle range θw from which the laser beam T is emitted.

[Third embodiment of the present invention]
FIG. 9 shows a third embodiment of the present invention and shows a state in which the same triangulation as that in FIG. 7 is performed.

  In the third embodiment, the configuration of the CCD camera (condenser imager) 2 is the same as in the first and second embodiments, and the same reference numerals are given to the same parts and portions. The structure of the laser light emitting device 31 is different from the laser light emitting device 1 of the first and second embodiments.

  In FIG. 9, the laser light emitting device 31 has a structure that can rotate around the vertical line O1 passing through the measuring point P1, and only one or a bunch of linear horizontal laser beams T2 orthogonal to the vertical line O1. It is configured to radiate. The laser light emitting device 31 can be rotated continuously in the same direction or can be reciprocated around the vertical line O1 within a predetermined angle range.

  The horizontal angle measurement method and the position measurement method are also basically the same as in the first embodiment, but at the time of measurement, the CCD camera 2 and the laser light-emitting device 31 are rotated continuously or reciprocally simultaneously, It is detected from the image of the CCD camera 2 that the optical axis J of the CCD camera 2 and the laser beam T2 coincide on the same straight line, and the horizontal angle θ1 (and θ2) is determined by the rotation angle of the CCD camera 2 at the time of detection. taking measurement.

  According to this structure, it is necessary to rotate the laser light emitting device 31, but since a laser beam having high energy and low attenuation is used, it is possible to accurately measure even a remote measuring point.

[Other embodiments]
(1) The laser light emitting device 1 shown in FIG. 1 includes a self-horizontal holding mechanism using a gyro and a centripetal mechanism that emits a laser beam Tc vertically downward, but as shown in the CCD camera 2 of FIG. A leveling and centripetal work can be made manually with a level. Of course, on the other hand, on the CCD camera 2 side, similarly to the laser light emitting device 1, a self-horizontal holding mechanism using a gyro and a centripetal mechanism for emitting a laser beam Tc vertically downward may be provided.

(2) The measuring method shown in FIG. 1 and the like has a structure in which the CCD camera 2 is rotated around the vertical rotation axis O2 by the motor 16, but the CCD camera 2 is manually rotated so that the operator can monitor the monitor shown in FIG. 26, it is detected that the optical axis J is coincident with the radiation center B0 of the laser ring beam B, and the horizontal angle is measured by reading the rotation angle of the CCD camera 2 by the encoder 17 or the like at the time of detection. It is also possible to do.

(3) The condensing imager is not limited to the CCD camera 2 as shown in FIG. 1, and includes at least a condensing lens 12 and an image surface 13, and can directly observe image formation on the image surface, or a monitor. Any structure can be used as long as it can be observed. Further, a CMOS camera can be used instead of the CCD camera.

(4) Although the encoder is used as the angle measuring device for measuring the rotation angle of the condensing imager in the above embodiment, a potentiometer or other angle measuring device may be used.

(5) In the triangulation shown in FIG. 7 and FIG. 9, the installation points A1 and A2 are set at two locations, but are not limited to two locations, and the installation points are set at three or more locations, thereby measuring. It is also possible to improve accuracy.

It is 1st Embodiment of the horizontal angle measuring method and positioning method concerning this invention, and is a perspective view of the laser light-emitting device and CCD camera which are used for the said method. 6 is a schematic plan view showing a positional relationship among a laser light emitting device, a condensing lens, and an image plane showing a state in the middle of detecting a measurement point. It is a schematic plan view showing a positional relationship among a laser light emitting device, a condensing lens, and an image plane showing a state when a measurement point is detected. FIG. 4 is an enlarged front view of the image plane corresponding to the state of FIG. 2 (viewed along arrow IV in FIG. 2). FIG. 4 is an enlarged front view (viewed in the direction of arrow V in FIG. 3) of the image plane corresponding to the state of FIG. 3. FIG. 3 is a schematic plan view of a CCD camera and a laser light emitting device showing a state in which a horizontal angle between two measurement points is being measured. FIG. 3 is a schematic plan view of a CCD camera and a laser light emitting device showing a state in which a position on a plane coordinate of one measurement point is being measured. It is 2nd Embodiment of the horizontal angle measuring method and positioning method concerning this invention, and is a perspective view of the laser light-emitting device and CCD camera which are used for the said method. It is 3rd Embodiment of the horizontal angle measuring method and positioning method concerning this invention, and is a perspective view of the laser light-emitting device and CCD camera which are used for the said method. FIG. 9 is a schematic plan view showing a state of measuring a position coordinate of one measurement point by a transit, which is a conventional measurement method and uses a survey pole as a measurement target.

Explanation of symbols

1 Laser emitting device 2 CCD camera (an example of a focusing imager)
12 condensing lens 13 image surface 14 rotating shaft 16 motor 17 encoder (an example of an angle measuring device)
25 Controller 26 Monitor 31 Laser emission device T, T1, T2 Laser beam

Claims (7)

A laser light emitting device that emits a horizontal laser beam over a predetermined azimuth angle range with a point on the vertical line passing through the measurement point as the radiation center is installed at the measurement point,
A condensing imager that forms an object to be condensed on the image surface by a condensing lens is installed at an installation point so as to be rotatable around a vertical rotation axis.
The condensing imager is rotated about the rotation axis of the installation point, and the optical axis of the condensing lens matches the radiation center of the laser beam, and a laser beam image is formed at a predetermined position on the image plane. Is detected by
A horizontal angle measuring method characterized by obtaining a horizontal angle around the installation point with another measurement point, a known point, a reference orientation or a reference line passing through the installation point and the measurement point. The horizontal angle measuring method according to claim 1,
The laser light emitting device is a laser light emitting device that emits a horizontal laser beam in all directions with a point on a vertical line passing through a measurement point as a radiation center. A laser emitting device that emits one or a bunch of linear horizontal laser beams orthogonal to a point on the vertical line passing through the measuring point is installed at the measuring point so as to be rotatable about the vertical line,
A condensing imager that forms an object to be condensed on the image surface by a condensing lens is installed at an installation point so as to be rotatable around a vertical rotation axis.
The condensing imager is rotated about the axis of rotation of the installation point, the laser light emitting device is rotated about the vertical line, and the optical axis of the condensing lens matches the laser beam. Detected by the formation of a laser beam image at a predetermined position on the surface,
A horizontal angle measuring method characterized by obtaining a horizontal angle around the installation point with another measurement point, a known point, a reference orientation or a reference line passing through the installation point and the measurement point. The horizontal angle measuring method according to any one of claims 1 to 3,
A motor that rotationally drives the condensing imager around a rotation axis; and an angle measuring device that detects a rotation angle around the rotation axis of the condensing imager;
Connecting the image plane, motor and angle measuring instrument to a controller;
The controller controls the rotation angle of the condensing imager by the motor so that the image formation of the laser beam is at the predetermined position based on the horizontal position information of the image formation of the laser beam on the image plane. A horizontal angle measuring method characterized by: The horizontal angle measuring method according to any one of claims 1 to 4,
The horizontal angle measurement method according to claim 1, wherein the image plane is formed by arranging a large number of CCD image sensor elements. The horizontal angle measuring method according to claim 5, wherein
A horizontal angle measuring method, comprising: connecting a monitor to the controller; and displaying an image of a laser beam formed on an image plane formed of the CCD image sensor element on the monitor so as to be visible. For one measurement point, install the condenser imager at two or more installation points.
By the method according to any one of claims 1 to 6, a horizontal angle of each of the measurement points with respect to a reference line connecting any two installation points is obtained,
A position measurement method characterized in that a position on a plane coordinate of the measurement point is obtained from a distance between installation points and the measured horizontal angles.

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