Device for measuring photogrammetric control points

Abstract

The application discloses an apparatus for measuring photogrammetric control points. The device comprises a plane coordinate frame used for determining plane xy coordinates of photogrammetry control points; the positioning component is used for positioning the photogrammetry control point, and the plane xy coordinate of the photogrammetry control point is determined based on the plane coordinate frame after the positioning component positions the photogrammetry control point; and the height coordinate part determines the height z coordinate of the photogrammetry control point based on the height coordinate part after the positioning part positions the photogrammetry control point. Therefore, the photogrammetry control points in a small range can be measured.

Description

Technical Field

[0001] The present application relates to the field of positioning measurement, and more particularly, to a device for measuring photogrammetric control points. Background Art

[0002] Global Positioning System-Real-Time Kinematic (GPS-RTK) is a positioning technology that dynamically measures point coordinates. The GPS-RTK system consists of a base station and a rover. The rover receives differential correction data and satellite signals from the base station and, through real-time processing, corrects its own positioning errors, thereby achieving centimeter-level high-precision positioning. Global Navigation Satellite System-Real-Time Kinematic (GNSS-RTK) is a high-precision differential positioning technology based on carrier phase observations. By processing the carrier phase observations between the base station and the rover in real time, it can provide centimeter-level positioning accuracy.

[0003] GPS-RTK and GNSS-RTK are suitable for measuring control points in photogrammetry over a large area. However, there are currently no effective equipment or measures for measuring control points in a smaller area, such as in areas under observation for soil erosion and gully erosion.

[0004] How to measure photogrammetric control points in a smaller range has become a technical problem that needs to be solved in this field. Summary of the Invention

[0005] In view of this, the present application proposes a device for measuring photogrammetric control points, so as to achieve measurement of photogrammetric control points in a smaller range.

[0006] The present application provides a device for measuring photogrammetric control points, which includes: a plane coordinate frame for determining the plane xy coordinates of the photogrammetric control points; a positioning component for positioning the photogrammetric control points, wherein the positioning component determines the plane xy coordinates of the photogrammetric control points based on the plane coordinate frame after positioning the photogrammetric control points; and a height coordinate component, wherein the positioning component determines the height z coordinate of the photogrammetric control points based on the height coordinate component after positioning the photogrammetric control points.

[0007] Optionally, the plane coordinate frame includes: a first vertical pole, a second vertical pole, a third vertical pole, and a fourth vertical pole, and the first vertical pole, the second vertical pole, the third vertical pole and the fourth vertical pole are distributed at the four vertices of a rectangle; a first cross bar, a second cross bar, a third cross bar, and a fourth cross bar, the first cross bar connects the first vertical pole and the second vertical pole, the second cross bar connects the third vertical pole and the fourth vertical pole, the third cross bar connects the first vertical pole and the third vertical pole, and the fourth cross bar connects the second vertical pole and the fourth vertical pole, the first cross bar, the second cross bar, the third cross bar and the fourth cross bar form a rectangle, and the first cross bar and / or the second cross bar, the third cross bar and / or the fourth cross bar have a ruler for determining the plane xy coordinates.

[0008] Optionally, at least one of the following groups is connected by a right-angle connecting member: the first vertical pole and the first cross bar and the third cross bar, the second vertical pole and the first cross bar and the fourth cross bar, the third vertical pole and the second cross bar and the third cross bar, and the fourth vertical pole and the second cross bar and the fourth cross bar.

[0009] Optionally, the right-angle connecting member is connected with a horizontal adjustment nut.

[0010] Optionally, each of the at least one group comprises a crossbar equipped with a level measuring member.

[0011] Optionally, the level measuring member is a level.

[0012] Optionally, the positioning component includes: a first sliding bar and a second sliding bar, which are slidably connected to the plane coordinate frame, and the first sliding bar and the second sliding bar are respectively parallel to the two coordinate directions of the plane xy coordinates; and a slider, the first sliding bar and the second sliding bar pass through the slider respectively, and the slider slides along the first sliding bar and the second sliding bar to locate the photogrammetry control point.

[0013] Optionally, the height coordinate component is a positioning rod, which is perpendicular to the plane where the first sliding rod and the second sliding rod are located and passes through the sliding block.

[0014] Optionally, the device further comprises: a control point identification component placed at the photogrammetry control point.

[0015] Optionally, the control point identification component is a positioning pin.

[0016] According to the technical solution of the present application, the positioning component locates the photogrammetric control point. After locating the photogrammetric control point, the plane xy coordinates and the height z coordinates of the photogrammetric control point are respectively determined based on the plane coordinate frame and the height coordinate component, thereby determining the three-dimensional coordinates of the photogrammetric control point and measuring the photogrammetric control point. In the technical solution of the present application, the measurement range is determined based on the plane coordinate frame, and the plane coordinate frame can cover a smaller range, thereby realizing the measurement of photogrammetric control points in a smaller range.

[0017] Other features and advantages of the present application will be described in detail in the subsequent detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The accompanying drawings, which constitute part of this application, are used to provide a further understanding of the application, and the exemplary embodiments of the application and their descriptions are used to explain the application. In the accompanying drawings:

[0019] Figure 1 Schematic diagram of the structure of a device for measuring photogrammetric control points according to a preferred embodiment of the present application;

[0020] Figure 2 Schematic diagram of an application of a device for measuring photogrammetric control points according to a preferred embodiment of the present application;

[0021] Figure 3 1 is a top view of a device for measuring photogrammetric control points according to a preferred embodiment of the present application;

[0022] Figure 4 It is a front view of a device for measuring photogrammetric control points according to a preferred embodiment of the present application;

[0023] Figure 5 It is a left view of a device for measuring photogrammetric control points according to a preferred embodiment of the present application;

[0024] Figure 6 1 is a top view of a right-angle connecting member and a horizontal adjustment nut according to a preferred embodiment of the present application;

[0025] Figure 7 It is a right side view of a right-angle connecting member and a horizontal adjustment nut according to a preferred embodiment of the present application;

[0026] Figure 8 A top view of a slider according to a preferred embodiment of the present application;

[0027] Figure 9 It is a front view of a slider according to a preferred embodiment of the present application;

[0028] Figure 10 It is a right side view of the slider according to the preferred embodiment of the present application;

[0029] Figure 11 A side view of a pole according to a preferred embodiment of the present application;

[0030] Figure 12 A top view of a positioning pin according to a preferred embodiment of the present application;

[0031] Figure 13 A side view of a positioning pin according to a preferred embodiment of the present application;

[0032] Figure 14 A side view of a positioning rod according to a preferred embodiment of the present application;

[0033] Figure 15 It is a front view of a first crossbar according to a preferred embodiment of the present application;

[0034] Figure 16 It is a front view of a third crossbar according to a preferred embodiment of the present application;

[0035] Figure 17 is a top view of a first sliding bar according to a preferred embodiment of the present application;

[0036] Figure 18 is a front view of a first sliding bar according to a preferred embodiment of the present application;

[0037] Figure 19 is a front view of a second sliding bar according to a preferred embodiment of the present application;

[0038] Figure 20 A top view of a second sliding bar according to a preferred embodiment of the present application; and

[0039] Figure 21 It is a side view of the second sliding bar according to a preferred embodiment of the present application. DETAILED DESCRIPTION

[0040] The technical solution of the present application will be described in detail below with reference to the accompanying drawings and in combination with the implementation methods.

[0041] An embodiment of the present application provides a device for measuring photogrammetric control points, which can measure the three-dimensional coordinates of the photogrammetric control points.

[0042] The technical solution provided by the embodiment of the present application can be applied in many aspects. For example, after measuring the three-dimensional coordinates of the photogrammetric control points, the photogrammetric control points are laid out (i.e., marked), and the photogrammetric method is used to generate the soil erosion surfaces of the slopes at different periods using the photogrammetric control points. Each erosion surface is imported into a three-dimensional modeling software system to create a three-dimensional soil erosion model, calculate the amount of soil loss, and study the development and change process of the soil erosion gully. After determining the three-dimensional coordinates of the photogrammetric control points using the technical solution provided by the embodiment of the present application, conditions are created for the subsequent three-dimensional soil erosion gully extraction, soil erosion amount calculation, and research on the soil erosion gully development process and influencing factors in a modeling manner.

[0043] The technical solutions provided in the embodiments of this application can be applied to measuring photogrammetric control points within a relatively small area. For example, the measurement range can be within a few square meters, such as 2 square meters. Alternatively, they can be applied to gully erosion caused by soil erosion. For example, control points can be placed during photogrammetric measurement of gullies less than 3 meters long and less than 0.5 meters wide.

[0044] The technical solution provided by the embodiment of this application can be applied to natural slopes, such as Figure 2 As shown. Using conventional measurement tools, it is difficult to accurately calibrate the three-dimensional coordinates of control points on natural slopes. When the accuracy of photogrammetric control point data does not meet the requirements, the accuracy of the mesh produced by photogrammetric measurement of slope gully erosion will be affected, and three-dimensional modeling and subsequent accurate measurement of soil erosion will also be difficult to achieve. The technical solution provided by the embodiments of this application can more accurately determine the three-dimensional coordinates of photogrammetric control points on natural slopes, thereby avoiding technical problems caused by the data accuracy of photogrammetric control points not meeting the requirements.

[0045] The device for measuring photogrammetric control points provided in the embodiments of the present application may include the following: a plane coordinate frame, a positioning component, and a height coordinate component.

[0046] The plane coordinate frame is used to determine the plane xy coordinates of the photogrammetric control points.

[0047] The positioning component is used to locate photogrammetric control points. After locating the photogrammetric control points, the positioning component determines the planar xy coordinates of the photogrammetric control points based on a planar coordinate frame. For example, the planar coordinate frame can be used to mark or measure planar xy coordinates. After locating the photogrammetric control points to be measured, the planar xy coordinates can be determined based on the planar coordinate frame.

[0048] After locating the photogrammetric control point, the positioning component determines the height z coordinate of the photogrammetric control point based on the height coordinate component. For example, the height coordinate component can be capable of marking or measuring the height z coordinate. After locating the photogrammetric control point to be measured, the height z coordinate can be determined based on the height coordinate component.

[0049] Optionally, in the embodiment of the present application, the plane coordinate frame includes a first vertical pole 10, a second vertical pole 11, a third vertical pole 12, a fourth vertical pole 13, a first crossbar 20, a second crossbar 21, a third crossbar 22, and a fourth crossbar 23. The four vertical poles can refer to Figure 11 To understand.

[0050] like Figure 1 or Figure 2 As shown, the first vertical pole 10, the second vertical pole 11, the third vertical pole 12 and the fourth vertical pole 13 are distributed at the four vertices of the rectangle. Figure 1 or Figure 2 As shown, the first crossbar 20 connects the first upright 10 and the second upright 11, the second crossbar 21 connects the third upright 12 and the fourth upright 13, the third crossbar 22 connects the first upright 10 and the third upright 12, and the fourth crossbar 23 connects the second upright 11 and the fourth upright 13. The first crossbar 20, the second crossbar 21, the third crossbar 22, and the fourth crossbar 23 form a rectangle. The first crossbar 20 and / or the second crossbar 21, the third crossbar 22, and / or the fourth crossbar 23 have a scale for determining the xy coordinates of a plane.

[0051] In the embodiment of the present application, the first crossbar 20 and the second crossbar 21 are parallel, and at least one of them has a scale. Similarly, at least one of the third crossbar 22 and the fourth crossbar 23 has a scale.

[0052] In the embodiment of the present application, the first crossbar 20 and the third crossbar 22 have scales, wherein the scale of the first crossbar 20 can refer to Figure 15 As shown, the scale of the third crossbar 22 can refer to Figure 16 shown.

[0053] In the embodiment of the present application, the first crossbar 20, the second crossbar 21, the third crossbar 22, and the fourth crossbar 23 may have a fixing bar 80 for easy fixing. Figure 15 As shown, for the first crossbar 20, the fixing strips 80 are distributed at both ends of the first crossbar 20. Figure 16 As shown, for the second crossbar 21, the fixing strips 80 are distributed at both ends of the second crossbar 21. For the third crossbar 22 and the fourth crossbar 23, the fixing strips 80 are also distributed at both ends of the crossbar. Figure 15 or Figure 16 To understand.

[0054] In the embodiment of the present application, there are many ways to connect the vertical poles and the horizontal poles. For example, they can be connected using right-angle connecting members. Specifically, in the embodiment of the present application, at least one of the following groups is connected by a right-angle connecting member 30: the first vertical pole 10 is connected to the first horizontal pole 20 and the third horizontal pole 22, the second vertical pole 11 is connected to the first horizontal pole 20 and the fourth horizontal pole 23, the third vertical pole 12 is connected to the second horizontal pole 21 and the third horizontal pole 22, and the fourth vertical pole 13 is connected to the second horizontal pole 21 and the fourth horizontal pole 23. In the embodiment of the present application, each vertical pole is connected to two horizontal poles, and at least one vertical pole is connected to two horizontal poles by a right-angle connecting member 30. Figure 1 or Figure 2 As shown, each vertical rod is connected to two horizontal rods via a right-angle connecting member 30 .

[0055] Optionally, in the embodiment of the present application, the right-angle connecting member 30 is connected with a horizontal adjustment nut 31 for leveling. Figure 3 As shown, each right angle connecting member 30 is connected to a horizontal adjustment nut 31. The relationship between the right angle connecting member 30 and the horizontal adjustment nut 31 can be referred to Figure 6 and Figure 7 Understand.

[0056] Optionally, in the embodiment of the present application, each of the at least one group of crossbars includes a level measuring device installed. In other words, in the embodiment of the present application, for the vertical poles and crossbars connected by the right-angle connecting member 30, the crossbars are installed with a level measuring device. Optionally, in the embodiment of the present application, the level measuring device can be a level 40.

[0057] like Figure 3 As shown, the first vertical pole 10 and the first cross bar 20 and the third cross bar 22, the second vertical pole 11 and the first cross bar 20 and the fourth cross bar 23, the third vertical pole 12 and the second cross bar 21 and the third cross bar 22, and the fourth vertical pole 13 and the second cross bar 21 and the fourth cross bar 23 are all connected by right-angle connecting members 30, and the first cross bar 20, the second cross bar 21, the third cross bar 22 and the fourth cross bar 23 are all installed with a spirit level 40.

[0058] Optionally, in the embodiment of the present application, the positioning component includes: a first slide bar 50, a second slide bar 51 and a slider 52. The first slide bar 50 and the second slide bar 51 are slidably connected to the plane coordinate frame, and the first slide bar 50 and the second slide bar 51 are respectively parallel to the two coordinate directions of the plane xy coordinate. The first slide bar 50 and the second slide bar 51 pass through the slider 52 respectively, and the slider 52 slides along the first slide bar 50 and the second slide bar 51 to locate the photogrammetry control point. Among them, the slider 52 can refer to Figure 8 、 Figure 9 and Figure 10 Understand.

[0059] like Figures 1 to 5 As shown, the first slide bar 50 is parallel to the first cross bar 20 and the second cross bar 21, the second slide bar 51 is parallel to the third cross bar 22 and the fourth cross bar 23, and the first slide bar 50 and the second slide bar 51 are on different planes parallel to the plane where the first cross bar 20 and the third cross bar 22 are located.

[0060] like Figure 17 or Figure 18 As shown, the first slide bar 50 has first reserved holes 501 at both ends, and the third cross bar 22 and the fourth cross bar 23 pass through the two first reserved holes 501 respectively. Figure 19 、 Figure 20 or Figure 21 As shown, the second slide bar 51 has slide bar uprights 511 at both ends, each slide bar upright 511 has a second reserved hole 513, and the first cross bar 20 and the second cross bar 21 pass through a second reserved hole 513 respectively.

[0061] like Figure 17 As shown, the first slide bar 50 has a first slide slot 502. Figure 20 As shown, the second slider 51 has a second slider slot 512. The slider 52 can slide along the first slider slot 502 or the second slider slot 512 to align the slider 52 with the photogrammetric control point. After the slider 52 is aligned with the photogrammetric control point, the plane xy coordinates of the photogrammetric control point can be determined based on the values ​​of the scales aligned on the crossbars of the first and second sliders 50, 51, respectively. In the embodiments of the present application, the coordinate origin of the plane coordinates can be selected according to the specific circumstances. For example, the intersection of two crossbars can be used as the coordinate origin.

[0062] Optionally, in the embodiment of the present application, the height coordinate component is a positioning rod 60. Figure 1 or Figure 2 As shown, the positioning rod 60 is perpendicular to the plane of the first and second slide bars 50 and 51 and passes through the slider 52. The positioning rod 60 has a scale. After the slider 52 is aligned with the photogrammetric control point, the positioning rod 60 is inserted into the slider 52, and the height z coordinate of the photogrammetric control point is determined based on the scale on the positioning rod 60. Specifically, after the positioning rod 60 reaches the photogrammetric control point, the height z coordinate is determined based on the value on the scale of the positioning rod 60 where the slider 52 is aligned.

[0063] In the embodiment of the present application, the photogrammetry control points can be determined according to the actual application scenario and measurement range. Figure 2 As shown in the figure, it is necessary to study the soil erosion situation and select 5 photogrammetry control points on the slope surface.

[0064] Specifically, the z-coordinate of a photogrammetric control point can be determined based on the positioning rod 60 according to the following procedure. After the positioning rod 60 is inserted into the slider 52 and reaches the photogrammetric control point, the slider 52 is aligned with the scale of the positioning rod 60 to obtain a reading, which is marked as the slider height value. Among all photogrammetric control points, one photogrammetric control point can be selected as the reference point for the z-coordinate of the height (a point with a z-coordinate of 0). The z-coordinate of this photogrammetric control point is marked as 0. That is, when the slider height value of this photogrammetric control point is converted to a z-coordinate, the z-coordinate of this photogrammetric control point is 0. For example, the lowest photogrammetric control point can be selected as the reference point for the z-coordinate of the height. For each of the other photogrammetric control points, the z-coordinate of each can be determined based on the relationship between its slider height value and the slider height value of the reference point. For example, if the slider height value of the photogrammetric control point serving as the reference point is 30 cm, then the z-coordinate of the photogrammetric control point with a slider height value of 20 cm is -10, and the z-coordinate of the photogrammetric control point with a slider height value of 40 cm is 10.

[0065] Optionally, in the embodiment of the present application, the slider 52 can be manually controlled to slide, or the slider 52 can be automatically controlled by a component to slide. For example, a controller and a motor are provided, the motor is used to drive the slider, and under the control of the controller, the motor controls the slider 52 to slide in two directions.

[0066] Optionally, in an embodiment of the present application, the device further comprises a control point identification component. The control point identification component is placed at the photogrammetric control point, thereby achieving identification of the photogrammetric control point and achieving the layout of the photogrammetric control point.

[0067] Optionally, in the embodiment of the present application, the control point identification component is a positioning pin. Figure 12 or Figure 13 shown.

[0068] Optionally, in the embodiment of the present application, a magnetic head may be provided at the lower end of the positioning rod 60 (ie, the end to be inserted into the area to be tested), such as Figure 14 As shown, the positioning pin is attracted by the magnetic head, and after the positioning rod 60 reaches the photogrammetric control point, the positioning pin is placed at the photogrammetric control point. By providing a magnetic head at the lower end of the positioning rod 60 to magnetically attract the positioning pin, and then using the positioning rod to place the positioning pin at the photogrammetric control point, photogrammetric control points can be identified without having to physically approach the control point, making it more convenient to identify and deploy photogrammetric control points. Furthermore, by placing positioning pins at photogrammetric control points, photogrammetric control points can be marked using a unified pattern.

[0069] In the embodiments of the present application, the device provided in the embodiments of the present application may be used with reference to the following contents.

[0070] The slope area to be studied is selected, and three-dimensional coordinate measurement and layout facilities are arranged in the area to be measured, that is, the device for measuring photogrammetric control points provided by the embodiment of the present application is arranged. Among them, the length of the first crossbar 20 is less than the length of the third crossbar 22. The long side of the facility is arranged longitudinally along the slope surface, such as Figure 2 As shown, the third crossbar 22 and the fourth crossbar 23 are arranged longitudinally along the slope, the first vertical bar 10 and the second vertical bar 11 are located at the bottom of the slope, and the third vertical bar 12 and the fourth vertical bar 13 are located at the top of the slope.

[0071] Adjust the horizontal adjustment nut 31 to keep the plane where the first cross bar 20, the second cross bar 21, the third cross bar 22 and the fourth cross bar 23 are located horizontally. The level meter 40 can be used to determine whether the plane is level.

[0072] Preliminarily select a photogrammetric control point on the slope surface, move the slider 52 along the first slider 50 and the second slider 51 to the control point area, insert the positioning rod 60 into the slider 52, install a positioning pin at the magnetic attraction at the lower end of the positioning rod 60, and insert the positioning pin into the selected photogrammetric control point on the slope surface.

[0073] The x-coordinate of the photogrammetric control point is read at the scale of the first crossbar 20 , the y-coordinate of the photogrammetric control point is read at the scale of the third crossbar 22 , and the z-coordinate of the photogrammetric control point is read at the scale of the positioning rod 60 .

[0074] Repeat the above steps to mark all control points and record their 3D coordinates.

[0075] Optionally, in the embodiments of the present application, the vertical rods, horizontal rods, and sliding rods may be cylindrical rods, and their dimensions may refer to those shown in the accompanying drawings. The caps of the positioning pins may be numbered with numbers and letters. For example, for positioning pins used to mark the boundaries of a survey area, letters may be marked on the lower right corner of the crosshairs on the caps to distinguish them: O, X, Y, B; for positioning pins used to mark control points, numbers may be marked on the lower right corner of the crosshairs on the caps to distinguish them: 00, 01, 02, etc.

[0076] The number of positioning pins can be determined according to the specific situation and there is no limit on this.

[0077] It should be noted that, in the embodiments of the present application, “first”, “second”, “third”, “fourth”, etc. are only used to distinguish and facilitate description, and are not used for limitation.

[0078] Through the technical solution provided in the implementation mode of this application, photogrammetric control points are measured, arranged, and marked with names (for example, the numbers of positioning pins). Each photogrammetric control point corresponds to a name and a three-dimensional coordinate, which facilitates subsequent photogrammetry.

[0079] The technical solution provided by the embodiments of this application has a simple facility structure, is easy to operate, has a low production cost, and is easy to promote and use. Through the technical solution provided by the embodiments of this application, photogrammetric control points in the area to be measured can be quickly and accurately calibrated, creating conditions for subsequent accurate measurement of the mesh surface of the area to be measured, three-dimensional solid modeling of the slope, extraction of erosion gully models, determination of soil and water loss, and research on the formation and development patterns of gully erosion on the slope, thus promoting the transformation of slope soil and water loss measurement from traditional measurement methods to digital measurement methods.

[0080] The preferred embodiments of the present application are described in detail above. However, the present application is not limited to the specific details of the above embodiments. Within the technical concept of the present application, various simple modifications can be made to the technical solution of the present application, and these simple modifications all fall within the scope of protection of the present application.

[0081] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any appropriate manner unless there is any contradiction. In order to avoid unnecessary repetition, this application will not further describe various possible combinations.

[0082] In addition, the various implementation methods of the present application may be arbitrarily combined, and as long as they do not violate the concept of the present application, they should also be regarded as the contents disclosed in the present application.

Claims

1. A device for measuring photogrammetric control points, characterized in that: The device includes: Plane coordinate frame, used to determine the plane xy coordinates of photogrammetric control points; a positioning component, configured to position the photogrammetric control point, wherein after positioning the photogrammetric control point, the positioning component determines the planar xy coordinates of the photogrammetric control point based on the planar coordinate frame; A height coordinate component, after the positioning component positions the photogrammetry control point, determines the height z coordinate of the photogrammetry control point based on the height coordinate component.

2. The device according to claim 1, characterized in that The plane coordinate frame comprises: A first vertical pole, a second vertical pole, a third vertical pole, and a fourth vertical pole, wherein the first vertical pole, the second vertical pole, the third vertical pole, and the fourth vertical pole are distributed at four vertices of a rectangle; A first crossbar, a second crossbar, a third crossbar, and a fourth crossbar, wherein the first crossbar connects the first vertical pole and the second vertical pole, the second crossbar connects the third vertical pole and the fourth vertical pole, the third crossbar connects the first vertical pole and the third vertical pole, and the fourth crossbar connects the second vertical pole and the fourth vertical pole; the first crossbar, the second crossbar, the third crossbar, and the fourth crossbar form a rectangle; the first crossbar and / or the second crossbar, the third crossbar, and / or the fourth crossbar have a ruler for determining the xy coordinates of the plane.

3. The device according to claim 2, characterized in that At least one of the following groups is connected by a right-angle connecting member: the first vertical pole and the first crossbar and the third crossbar, the second vertical pole and the first crossbar and the fourth crossbar, the third vertical pole and the second crossbar and the third crossbar, and the fourth vertical pole and the second crossbar and the fourth crossbar.

4. The device according to claim 3, characterized in that The right-angle connecting member is connected with a horizontal adjustment nut.

5. The device according to claim 4, characterized in that Each of the at least one group comprises a crossbar with a level measuring member mounted thereon.

6. The device according to claim 5, characterized in that The level measuring member is a level.

7. The device according to claim 1, characterized in that The positioning component includes: A first sliding rod and a second sliding rod are slidably connected to the plane coordinate frame, the first sliding rod and the second sliding rod are respectively parallel to two coordinate directions of the plane xy coordinate; and A slider, wherein the first slider and the second slider pass through the slider respectively, and the slider slides along the first slider and the second slider to locate the photogrammetry control point.

8. The device according to claim 7, characterized in that The height coordinate component is a positioning rod, which is perpendicular to the plane where the first sliding rod and the second sliding rod are located and passes through the sliding block.

9. The device according to claim 1, characterized in that The device also includes: Control point identification components are placed at the photogrammetric control points.

10. The device according to claim 9, characterized in that The control point identification component is a positioning pin.

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