Field surveying and mapping device for forestry investigation

Abstract

The invention provides a field surveying and mapping device for forestry investigation, and belongs to the technical field of surveying and mapping equipment, the field surveying and mapping device comprises a surveying and mapping support, a surveying and mapping instrument body is installed on the surveying and mapping support, and the surveying and mapping instrument body is used for surveying trees; the surveying instrument body adopts a remote ground three-dimensional laser scanner, vertex points, bottom points and edge points corresponding to plane feature points recognized and extracted by utilizing a feature point histogram are used as monitoring points, tree feature information of the height, the gradient and the perimeter size of a tree is calculated through recognized coordinates of the monitoring points, after equipment is installed, personnel participation is not needed in the measurement process, and the measurement efficiency is greatly improved. The surveying and mapping support is simple in structure and small in influence of personnel operation, systematic data collection can be conducted on trees in a large-range area, the tree size collection efficiency and precision are effectively improved, the surveying and mapping support comprises a supporting base, a supporting main shaft, a mounting shaft, a telescopic main shaft, a rotating table and an adjusting mounting table which are sequentially connected from bottom to top, the surveying and mapping efficiency is improved, and field use is facilitated.

Description

Technical Field

[0001] The invention belongs to the technical field of surveying and mapping equipment, and relates to a field surveying and mapping device used for forestry investigation. Background Art

[0002] Forestry refers to the production department that protects the ecological environment and maintains ecological balance, cultivates and protects forests to obtain timber and other forest products, and utilizes the natural characteristics of forests to play a protective role. It is an important part of the national economy. Forestry survey is an important measure to protect the ecological environment and maintain ecological balance, and the cultivation and protection of forestry also makes it convenient for people to obtain timber and other forest products, and utilizes the natural characteristics of forests to play a role in production and processing. It is an important part of the national economy. At present, a surveying and mapping instrument is used in the process of forestry survey to measure the height of trees.

[0003] For example, application number CN202421470357.1 provides a tree spacing measurement device for forestry field surveys, including a strip board, an infrared distance measuring mechanism is provided on the left side of the strip board, and a temporary fixing mechanism is provided on the right side of the strip board. The infrared distance measuring mechanism includes a positioning frame, and the positioning frame is fixedly installed on the left side of the strip board. A rotating seat is rotatably connected to the inner wall of the positioning frame. Through the design of the infrared rangefinder body, it is fixed on one of the trees to be measured and aimed at another tree to be measured. Controlling its work to emit infrared rays can measure the spacing between trees. However, the function of the surveying and mapping device used for forestry surveys is relatively single. First, the measurement process requires personnel participation, which is easily affected by personnel proficiency or operation, resulting in large errors. Second, it is inconvenient to install and use, and it is not convenient to install and deploy in the field environment. The measurement range is small and the measurement efficiency is low. In summary, the present application now proposes a field surveying and mapping device for forestry surveys to solve the above-mentioned problems. Summary of the invention

[0004] In order to solve the technical problems existing in the above-mentioned background technology, the present invention provides a field surveying device for forestry survey, characterized in that it comprises: a surveying bracket, on which a surveying instrument body (1) is installed, and the surveying instrument body (1) is used to measure trees; The surveying and mapping support comprises a support seat (9), a support spindle (7), a mounting shaft (6), a telescopic spindle (4), a rotating platform (3) and an adjustable mounting platform (2) which are connected in sequence from bottom to top, and the adjustable mounting platform (2) is used to mount a surveying and mapping instrument body (1); The mapping instrument body (1) uses a remote terrestrial three-dimensional laser scanner. After fixing the position of the remote terrestrial three-dimensional laser scanner, the trees are scanned to obtain point cloud data. The point cloud data is exported for processing and analysis. The space resection method of fitting the point cloud center with a scanning target is used to establish a monitoring coordinate system. An octree spatial index is established for the scanned tree point cloud. According to the prior regression algorithm, a plane is fitted, and the center of the plane point cloud in the network is extracted as the plane feature point. For the point cloud in the stable area of the tree's surrounding environment, the iterative closest point stitching algorithm is used to establish an engineering coordinate system, and the corresponding feature points of the same name on the plane are extracted. The vertices, bottom points, and edge points corresponding to the plane feature points extracted by the feature point histogram are used as monitoring points. The height, inclination, and perimeter dimensions of the tree, which are the tree feature information, are calculated through the coordinates of the identified monitoring points.

[0005] Further, the support main shaft is sequentially connected with a sliding ring, an angle adjusting rod, and a support leg from the axis center to the outside; the support leg includes a first support frame, a second support frame, and a third support frame connected in sequence; one end of the first support frame is connected to one end of the second support frame through a driving mechanism, the other end of the second support frame is connected to one end of the third support frame, and the other end of the third support frame is installed with a base. The driving mechanism includes a rotating shaft, a driving motor, and an elastic driver. The first output end of the driving motor is connected to the rotating shaft, and the rotating shaft drives the second support frame to rotate. The second output end of the driving motor is connected to the elastic driver, and the elastic driver drives the third support frame to rotate through a connecting rod; the elastic driver includes a driving shaft, an elastic sheet, and a driving ring installed in sequence from the inside to the outside.

[0006] Further, four support legs are provided. One ends of the four support legs are hingedly installed on the side of the installation shaft and are arranged circumferentially around the installation shaft. A sliding groove is provided on the support leg, and a slider is installed in the sliding groove. The slider is connected to one end of the angle adjusting rod, and the other end of the angle adjusting rod is hinged to the sliding ring. The sliding ring is installed on the outer side of the support main shaft and can slide along the axial direction of the support main shaft.

[0007] Further, a support seat is provided at the bottom of the support main shaft, and the support seat is an inverted frustum shape.

[0008] Further, the outer side of the installation shaft is provided with first installation holes arranged in an array. The first installation holes are used to install the ends of the support legs. Second installation holes are provided at a set distance above the first installation holes. The second installation holes are used to install one end of a connecting rod, and the other end of the connecting rod is connected to a rotating table.

[0009] Furthermore, a telescopic main shaft is installed on the top surface of the mounting shaft. The telescopic main shaft can be telescoped along the axial direction of the mounting shaft. A rotating table is installed on the top of the telescopic main shaft. The bottom side of the rotating table is connected to the other end of the connecting rod. The rotating table has built-in rotating motor and encoder. The rotating motor is used to drive the rotating table to rotate. The encoder monitors the angular displacement of the rotating table. The rotating motor and the encoder are connected to a controller.

[0010] Furthermore, an adjustment mounting platform is arranged on the rotating platform, and the adjustment mounting platform includes a frame and an angle adjustment frame arranged at the bottom of the frame; the angle adjustment frame includes a main rod plate, an adjustment plate and an angle encoder, the main rod plate is hinged to the adjustment plate, and the surveying instrument body is installed on the upper surface of the adjustment plate.

[0011] Furthermore, the driving shaft is connected to the second output end of the driving motor, and the driving ring is mounted on the driving shaft through an elastic sheet.

[0012] The beneficial effects of the present invention are: 1. The present invention provides a field surveying and mapping device for forestry investigation, comprising a surveying and mapping bracket, on which a surveying and mapping instrument body is installed, the surveying and mapping instrument body is used to measure the height distance of trees, the surveying and mapping instrument body adopts a remote ground three-dimensional laser scanner, after the remote ground three-dimensional laser scanner is fixed in position, the trees are scanned to obtain point cloud data, the point cloud data is exported for processing and analysis, after processing, the plane feature points corresponding to the vertices, bottom points and edge points extracted are identified using a feature point histogram as monitoring points, the height, inclination and circumference of the trees are calculated through the identified monitoring point coordinates, and the tree feature information is obtained. After the equipment is installed, the measurement process does not require human participation and is less affected by human operation, and can systematically collect data on trees in a large area, effectively improving the efficiency and accuracy of tree size collection.

[0013] 2. The present invention uses a surveying and mapping personnel to place the field surveying and mapping device at the target detection position at a certain distance from the tree, place or insert the support base into the ground, and adjust the support legs to contact and fix them with the ground after maintaining stability. The elastic structure of the support legs can ensure that sufficient support force is provided to reduce the influence of wind or ground deformation and settlement. Then, the installation angle of the surveying and mapping instrument body is adjusted by telescopic main shaft, rotating table and adjusting mounting table, and the surveying and mapping instrument body is used to map the trees. The surveying and mapping instrument body adopts a remote ground three-dimensional laser scanner, which emits laser when working and receives the rebounded laser, scans the trees to obtain point cloud data, and exports the point cloud data for processing and analysis to calculate the tree height, inclination and circumference size and other tree feature information, thereby improving the surveying and mapping efficiency and facilitating field use.

[0014] Advantages of additional aspects of the present invention will be given in part in the following description, and in part will become obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The accompanying drawings in the specification, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0016] Figure 1 It is a schematic diagram of the structure of a field surveying and mapping device for forestry investigation in a first state of the present invention; Figure 2 It is a schematic diagram of the second state structure of a field surveying and mapping device for forestry investigation of the present invention; Figure 3 It is a schematic diagram of the installation of the elastic driver of the present invention; Figure 4 It is a schematic diagram of the installation of the connecting rod of the present invention; Among them: 1. Surveying instrument body; 2. Adjustment mounting table; 3. Rotating table; 4. Telescopic main shaft; 5. Connecting rod; 6. Mounting shaft; 7. Support main shaft; 8. Support leg; 9. Support seat; 801. First support frame; 802. Second support frame; 803. Third support frame; 804. Base; 805. Drive motor; 806. Drive ring; 807. Connecting rod; 808. Elastic sheet; 809. Drive shaft. DETAILED DESCRIPTION

[0017] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0018] It should be noted that the following detailed descriptions are all illustrative and are intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used in this embodiment have the same meanings as those commonly understood by those skilled in the art to which the present invention belongs.

[0019] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit exemplary embodiments according to the present invention. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprising" and / or "including" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0020] In the present invention, terms such as "upper", "lower", "left", "right", "front", "back", "vertical", "horizontal", "side", "bottom", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings. They are relational words determined only for the convenience of describing the structural relationships of the various parts or elements of the present invention, and do not specifically refer to any part or element in the present invention and should not be understood as limitations on the present invention.

[0021] In the present invention, terms such as "fixed connection", "connected", "connection", etc. should be understood in a broad sense, indicating that it can be fixedly connected, integrally connected or detachably connected; it can be directly connected or indirectly connected through an intermediate medium. Relevant scientific research or technical personnel in this field can determine the specific meanings of the above terms in the present invention according to specific circumstances, and they should not be understood as limiting the present invention.

[0022] Embodiment 1, as Figure 1-Figure 4 As shown, this embodiment provides a field surveying and mapping device for forestry survey, including a surveying and mapping bracket, on which a surveying and mapping instrument body 1 is installed, and the surveying and mapping instrument body 1 is used to measure the height distance of trees; The surveying instrument body 1 adopts a long-range ground 3D laser scanner. After the position of the long-range ground 3D laser scanner is fixed, the trees are scanned to obtain point cloud data, and the point cloud data is exported for processing and analysis. The spatial rear intersection method of the scanning target fitting point cloud center is used to establish a monitoring coordinate system, and an octree spatial index is established for the scanned tree point cloud. The plane is fitted according to the first regression algorithm, and the center of the plane point cloud in the network is extracted as the plane feature point. For the stable area point cloud of the tree surrounding environment, an engineering coordinate system is established using an iterative nearest point splicing algorithm, and the plane feature points with the same name are extracted and identified. The feature point histogram is used to identify the vertices, bottom points, and edge points corresponding to the extracted plane feature points as monitoring points, and the height, inclination and circumference of the tree are calculated through the identified monitoring point coordinates. Tree feature information

[0023] There are many ways to calculate the height. One example is to first obtain the horizontal distance x between the surveying instrument body 1 and the tree, and use the detection angle a of the surveying instrument body 1 to the vertex, divide the distance x by tan (a) to get the height h1, and add the height h1 to the height h2 of the surveying instrument body 1 to get the tree height H; for other methods, the surveying instrument can also be used to measure the distance between the vertices to get the hypotenuse length L, and multiply L by sin (a) to get the height h1. There are also many ways to measure the inclination. One is to adjust the surveying instrument body 1 to a certain height and then measure the horizontal distance at different heights to determine the inclination. It is also possible to collect the point cloud coordinates in the height direction and then summarize and construct a coordinate system, and use the average angle formed by the lines in the coordinate system as the inclination; for the circumference measurement, the coordinates of the edge points of the tree are detected to get the tree diameter, and the circumference of the tree is calculated using pi. The calculated circumference is measured by approximating the tree as a circle, which has an error with the actual measurement value and can be used as a reference value. It is also possible to collect multiple point clouds to draw a tree circumference change curve to measure a more accurate circumference.

[0024] The surveying and mapping bracket includes a support seat 9, a support spindle 7, a mounting shaft 6, a telescopic spindle 4, a rotating table 3 and an adjustment mounting table 2 which are connected in sequence from bottom to top. The adjustment mounting table 2 is used to install the surveying and mapping instrument body 1; the support spindle 7 is connected in sequence from the axis to the outside with a sliding ring, an angle adjustment rod and a support leg 8. Three support legs 8 are provided, and one end of the four support legs 8 is hingedly installed on the side of the mounting shaft 6 and arranged around the circumference of the mounting shaft 6. A slide groove is provided on the support leg 8, and a slider is installed in the slide groove. The slider is connected to one end of the angle adjustment rod, and the other end of the angle adjustment rod is hinged to the sliding ring. The sliding ring is installed on the outer side of the support spindle 7 and can slide along the axial direction of the support spindle 7 to adjust the position of the angle adjustment rod, thereby adjusting the angle of the support leg 8.

[0025] The outer side surface of the support main shaft 7 is provided with a plurality of sliding bars arranged along the axial direction of the support main shaft 7, and a sliding ring is installed on the sliding bar. The sliding ring can slide up and down along the sliding bar, and the position of the sliding ring is adjustable. A locking piece is provided on the sliding ring. The locking piece can be a locking bolt, which is installed to the mounting hole of the sliding ring by using an adjusting bolt for locking and fixing.

[0026] A support seat 9 is arranged at the bottom of the support main shaft 7. The support seat 9 is in the shape of an inverted truncated cone. The support seat 9 can obtain better supporting force in the soil and better complete angle adjustment.

[0027] The outer side surface of the mounting shaft 6 is provided with first mounting holes arranged in an array, the first mounting holes are used to mount the ends of the supporting legs 8, a second mounting hole is provided at a set distance from the first mounting hole, the second mounting hole is used to mount one end of the connecting rod 5, the other end of the connecting rod 5 is connected to the rotating table 3, the connecting rod 5 is a pair of hinged connecting rods 807, arranged in a V shape, and can support the rotating table 3 in a limited position; The telescopic main shaft 4 is installed on the top surface of the installation shaft 6. The telescopic main shaft 4 can be telescoped along the axial direction of the installation shaft 6. The rotating table 3 is installed on the top of the telescopic main shaft 4. The bottom side of the rotating table 3 is connected to the other end of the connecting rod 5. The rotating table 3 has built-in rotating motor and encoder. The rotating motor is used to drive the rotating table 3 to rotate. The encoder monitors the angular displacement of the rotating table 3. The rotating motor and the encoder are connected to a controller, and the rotation angle can be adjusted and monitored through controller instructions.

[0028] An adjustment mounting platform 2 is arranged on the rotating platform 3, and the adjustment mounting platform 2 includes a frame and an angle adjustment frame arranged at the bottom of the frame; the angle adjustment frame includes a main rod plate, an adjustment plate and an angle encoder, the main rod plate is hinged to the adjustment plate, a surveying instrument body 1 is installed on the upper surface of the adjustment plate, the angle encoder is used to monitor the angle of the adjustment plate, an empty slot is opened at the bottom of the main rod plate, an angle adjustment column is slidably installed in the empty slot, the top end of the angle adjustment column contacts with the bottom slide slot of the adjustment plate, and the lateral position of the angle adjustment column can change the installation angle of the adjustment plate and the main rod plate, an inner slot is also opened on the side of the empty slot of the main rod plate, and a pulley is slidably connected inside the inner slot, one end of the pulley is fixedly connected to the angle adjustment column, and the other end of the pulley is connected to the pulley motor, and the pulley is driven by the pulley motor to move along the inner slot, thereby driving the angle adjustment column to move, and then changing the angle of the adjustment plate.

[0029] The second auxiliary pulley is movably sleeved with a connecting rod 5 inside. By setting an angle adjustment column, a connecting rod 5 and a second auxiliary pulley, the connecting rod 5 is used to drive the angle adjustment column to move in the empty groove of the main rod plate. During the movement, the second auxiliary pulley movably sleeved on the surface of the connecting rod 5 slides inside the inner groove to provide auxiliary sliding force. When the angle adjustment column moves toward the inside of the main rod plate, the angle of the top angle steel drag rod increases accordingly. When the angle adjustment column moves toward the outside of the main rod plate, the angle of the top angle steel drag rod decreases accordingly, thereby achieving the purpose of adjusting the angle. The supporting leg 8 includes a first supporting frame 801, a second supporting frame 802 and a third supporting frame 803 which are connected in sequence. A slide groove is arranged on the outer side of the first supporting frame 801, a slider is installed in the slide groove, and the slider is connected to one end of the angle adjustment rod; one end of the first supporting frame 801 is connected to one end of the second supporting frame 802 through a driving mechanism, the other end of the second supporting frame 802 is connected to one end of the third supporting frame 803, and the other end of the third supporting frame 803 is installed with a base 804; The driving mechanism includes a rotating shaft, a driving motor 805 and an elastic driver. The first output end of the driving motor 805 is connected to the rotating shaft, and the rotating shaft drives the second support frame 802 to rotate. The second output end of the driving motor 805 is connected to the elastic driver, and the elastic driver drives the third support frame 803 to rotate through the connecting rod 807.

[0030] The elastic driver includes a drive shaft 809, an elastic sheet 808 and a drive ring 806 which are installed in sequence from the inside to the outside. The drive shaft 809 is connected to the second output end of the drive motor 805. The drive ring 806 is installed on the drive shaft 809 through the elastic sheet 808. The elastic sheet 808 can effectively and evenly distribute the supporting force of the support leg 8, thereby ensuring the stability of the support leg 8. It has a significant effect on the stability of the support frame erected in soft soil. When the elastic support leg 8 is placed in the soft soil, after the soil sinks into it, the elastic support can adjust the support position point according to the elastic potential when the soil sinks under force, thereby ensuring the balance and stability of the support frame; for example, For uneven bottom surfaces, if the four supporting legs 8 have the same height, one of the four supporting legs 8 will always be suspended, which is easy to be unstable, especially in windy conditions. Outdoor tree height measurement is generally easily affected by wind and the like. The present embodiment adopts elastic support. When it comes to uneven bottom surfaces, especially soft soil, the four supporting legs 8 can be driven by a motor to rotate at a set angle based on the elastic supporting structure, and the supporting position of the base 804 can be adaptively adjusted according to the elastic structure, thereby ensuring that each supporting leg 8 can contact the ground and provide a certain supporting force, so that it can remain stable when facing interference from wind or other factors, thereby effectively improving the efficiency and accuracy of tree size detection.

[0031] The support legs 8 are used to assist in supporting the support spindle 7. After the support spindle 7 is placed, the support legs 8 are adjusted to support the placed support spindle 7. If the placement position or angle of the support spindle 7 is slightly inclined to the horizontal direction of the ground, the support legs 8 will also support the placed angle or position. The horizontal adjustment of the surveying instrument body 1 can be adjusted and balanced by using the rotating table 3 and the adjustment mounting table 2.

[0032] During work, the surveying and mapping personnel place the field surveying and mapping device at the target detection position, at a certain distance from the trees, place or insert the support seat 9 into the ground, and adjust the support legs 8 to contact and fix them with the ground after maintaining stability. The elastic structure of the support legs 8 can ensure that sufficient support force is provided to reduce the impact of wind or ground deformation and settlement. Then, the installation angle of the surveying and mapping instrument body 1 is adjusted by telescopic main shaft 4, rotating table 3 and adjusting mounting table 2. The surveying and mapping instrument body 1 is used to map the trees. The surveying and mapping instrument body 1 adopts a remote ground three-dimensional laser scanner, which emits lasers when working and receives the reflected lasers to scan the trees to obtain point cloud data, and the point cloud data is exported for processing and analysis to calculate the tree feature information such as tree height, inclination and circumference.

[0033] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A field surveying and mapping device for forestry survey, characterized in that: include: A surveying and mapping support, on which a surveying and mapping instrument body (1) is installed, and the surveying and mapping instrument body (1) is used to measure trees; The surveying and mapping support comprises a support seat (9), a support spindle (7), a mounting shaft (6), a telescopic spindle (4), a rotating platform (3) and an adjustable mounting platform (2) which are connected in sequence from bottom to top, and the adjustable mounting platform (2) is used to mount a surveying and mapping instrument body (1); The surveying instrument body (1) adopts a long-range ground 3D laser scanner. After the long-range ground 3D laser scanner is fixed in position, the trees are scanned to obtain point cloud data, the point cloud data is exported for processing and analysis, a monitoring coordinate system is established by using a spatial rear intersection method of the scanned target fitting point cloud center, an octree spatial index is established for the scanned tree point cloud, a plane is fitted according to a pre-regression algorithm, the center of the plane point cloud in the network is extracted as a plane feature point, an engineering coordinate system is established for the stable area point cloud of the tree surrounding environment by using an iterative nearest point splicing algorithm, the plane feature points with the same name are extracted and identified, the feature point histogram is used to identify the vertex, bottom point and edge point corresponding to the extracted plane feature points as monitoring points, and the height, inclination and circumference of the tree are calculated by the identified monitoring point coordinates to obtain the tree feature information.

2. A field surveying and mapping device for forestry survey as claimed in claim 1, characterized in that: The supporting main shaft (7) is connected to the sliding ring, the angle adjustment rod and the supporting leg (8) in sequence from the axis to the outside; The supporting leg (8) comprises a first supporting frame (801), a second supporting frame (802) and a third supporting frame (803) which are connected in sequence; One end of the first support frame (801) is connected to one end of the second support frame (802) through a driving mechanism, the other end of the second support frame (802) is connected to one end of the third support frame (803), and the other end of the third support frame (803) is installed with a base (804); The driving mechanism comprises a rotating shaft, a driving motor (805) and an elastic driver, wherein a first output end of the driving motor (805) is connected to the rotating shaft, the rotating shaft drives the second support frame (802) to rotate, and a second output end of the driving motor (805) is connected to the elastic driver, and the elastic driver drives the third support frame (803) to rotate via a connecting rod (807); The elastic driver comprises a driving shaft (809), an elastic sheet (808) and a driving ring (806) which are installed in sequence from the inside to the outside.

3. A field surveying and mapping device for forestry survey as claimed in claim 2, characterized in that: Four support legs (8) are provided, one end of each of the four support legs (8) is hingedly mounted on the side of the mounting shaft (6), and the four support legs (8) are arranged around the circumference of the mounting shaft (6). A slide groove is provided on the support leg (8), a slide block is installed in the slide groove, the slide block is connected to one end of an angle adjustment rod, the other end of the angle adjustment rod is hingedly mounted to a sliding ring, the sliding ring is installed on the outer side of the support main shaft (7), and the sliding ring can slide along the axial direction of the support main shaft (7).

4. A field surveying and mapping device for forestry survey as claimed in claim 2, characterized in that: A support seat (9) is arranged at the bottom of the supporting main shaft (7), and the support seat (9) is in the shape of an inverted truncated cone.

5. A field surveying and mapping device for forestry survey as claimed in claim 2, characterized in that: The outer side surface of the mounting shaft (6) is provided with a first mounting hole and a second mounting hole arranged in an array, the first mounting hole is used to mount the end of the supporting leg (8), a set distance is provided between the second mounting hole and the first mounting hole, the second mounting hole is used to mount one end of a connecting rod (5), and the other end of the connecting rod (5) is connected to the rotating table (3).

6. A field surveying and mapping device for forestry survey as claimed in claim 5, characterized in that: A telescopic main shaft (4) is installed on the top surface of the installation shaft (6). The telescopic main shaft (4) can be telescoped along the axial direction of the installation shaft (6). A rotating table (3) is installed on the top of the telescopic main shaft (4). The bottom side of the rotating table (3) is connected to the other end of the connecting rod (5). The rotating table (3) has a built-in rotating motor and an encoder. The rotating motor is used to drive the rotating table (3) to rotate. The encoder monitors the angular displacement of the rotating table (3). The rotating motor and the encoder are connected to a controller.

7. A field surveying and mapping device for forestry survey as claimed in claim 6, characterized in that: An adjustment mounting platform (2) is arranged on the rotating platform (3), and the adjustment mounting platform (2) comprises a frame and an angle adjustment frame arranged at the bottom of the frame; the angle adjustment frame comprises a main rod plate, an adjustment plate and an angle encoder, the main rod plate is hinged to the adjustment plate, and a surveying instrument body (1) is installed on the upper surface of the adjustment plate.

8. A field surveying and mapping device for forestry survey as claimed in claim 2, characterized in that: The driving shaft (809) is connected to the second output end of the driving motor (805), and the driving ring (806) is installed on the driving shaft (809) through an elastic sheet (808).

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