A method and system for measuring standing tree diameter at breast height

Abstract

The invention discloses a method and system for measuring the breast diameter of a standing tree, and relates to the field of breast diameter measurement of a standing tree. During measurement, a telescopic contact of a spring reset sensor and one end of a first ruler arm and a second ruler arm are brought into contact with a standing tree column surface in a horizontal direction; when the telescopic contact, the first ruler arm and the second ruler arm are all in contact with the standing tree column surface, a data relationship between each contact point is obtained; a deformation variable generated by the spring reset sensor during contact is obtained through a fixed controller, and the diameter of a circle, i.e., the breast diameter of the standing tree, is obtained by using the data relationship through the deformation variable, thereby solving the problems of complex equipment operation, inconvenience in carrying in the field, difficulty in measuring in dense forests, poor anti-interference performance, high equipment cost and low measurement efficiency in current products for measuring the breast diameter of a standing tree, such as total stations, laser scanners, and electronic barcode rulers.

Description

Technical Field

[0001] The invention relates to the field of standing tree diameter at breast height measurement, and in particular to a standing tree diameter at breast height measurement method and system. Background Art

[0002] Diameter at breast height is the main indicator for measuring standing tree growth and an important attribute for forest resource surveys. It is not only the main indicator for calculating forest volume, but also reflects the structure and quality of the forest in depth.

[0003] The diameter at breast height of standing trees is one of the most basic factors in forest resource surveys. Traditional methods for measuring the diameter at breast height use tools such as hook rulers, calipers, and girder rulers. The limited range of calipers is not suitable for measuring trees with larger outer diameters; the girder ruler's measurer needs to touch the trunk with both hands, which is more complicated to operate. For the outer diameter measurement of a large number of standard trees, it usually requires the collaboration of a measurer and a recorder. The process is time-consuming, error-prone, and has a single function and is inaccurate. At the same time, the efficiency of manual reading and recording of data is low, and data is difficult to store and locate in time. These problems have always affected the quality of forest resource surveys. In recent years, some emerging products have also appeared that try to solve this problem with electronic technology, such as total station measurement, laser scanners, electronic barcode rulers, etc. However, the above products have many problems such as complex equipment operation, inconvenience in carrying in the field, difficulty in measuring in dense forests, poor anti-interference, high equipment cost, and low measurement efficiency, and have not been widely promoted and applied. Summary of the invention

[0004] In order to solve the problems of complex equipment operation, inconvenience in carrying in the field, difficulty in measuring in dense forests, poor anti-interference performance, high equipment cost and low measurement efficiency in the current products for measuring the diameter at breast height of standing trees, such as total station measurement, laser scanner, electronic barcode ruler, etc., the present invention proposes a method for measuring the diameter at breast height of standing trees, which approximates the cross section of the trunk of the standing tree to a circle, and uses a measuring device to obtain the diameter of the circle as the diameter at breast height of the standing tree;

[0005] The measuring device comprises a first ruler arm and a second ruler arm of equal length, a spring reset sensor disposed between the first ruler arm and the second ruler arm, and a fixed controller for fixing the spring reset sensor, the first ruler arm and the second ruler arm; the vertical distance between the spring reset sensor and the first ruler arm and the second ruler arm is greater than or equal to a preset distance; the first ruler arm, the second ruler arm and the spring reset sensor are parallel to each other and are in the same plane; the telescopic contact of the spring reset sensor is in the same horizontal plane as the ends of the first ruler arm and the second ruler arm in the same direction;

[0006] The method for measuring the standing tree diameter at breast height comprises the following steps:

[0007] S1: The retractable contact of the spring return sensor and one end of the first scale arm and the second scale arm are brought into contact with the surface of the standing wood column in the horizontal direction;

[0008] S2: Obtaining the data relationship between the contact points when the telescopic contact, the first scale arm, and the second scale arm are all in contact with the vertical wood column surface;

[0009] S3: The deformation variable generated by the spring reset sensor during contact is obtained through a fixed controller, and the diameter of the circle, i.e., the diameter at breast height of the standing tree, is obtained through the deformation variable using the data relationship.

[0010] Furthermore, the fixed controller includes a fixer, which is arranged at one end of the telescopic contact away from the spring reset sensor; used to fix one end of the telescopic contact away from the front end of the spring reset sensor and one end of the first ruler arm and the second ruler arm on the same horizontal plane and keep them parallel.

[0011] Furthermore, the fixed controller also includes a power module, a circuit board and a controller;

[0012] The fixed controller and the spring return sensor obtain electrical energy through a power module;

[0013] The deformation amount generated by the spring return sensor is transmitted to the controller through the circuit board;

[0014] The controller is used to obtain the deformation amount generated by the spring reset sensor during contact, and obtain the diameter of the circle, that is, the diameter at breast height of the standing tree, through the deformation amount using a data relationship, and save it.

[0015] Furthermore, the data relationship includes a first data relationship and a second data relationship. In step S3, the specific method of obtaining the circle diameter by using the data relationship through the deformation amount is:

[0016] S31: It is obtained through the first data relationship that the arc length from A1 to B is equal to the arc length from A1 to C, and thus the extension line of A1A must pass through the center of the circle O; wherein A1 is the contact point between the telescopic contact and the vertical wood column surface, B is the contact point between the second ruler arm and the vertical wood column surface, C is the contact point between the first ruler arm and the vertical wood column surface, and A is the original position point when it is assumed that the telescopic contact is not deformed during measurement;

[0017] S32: Obtaining a second data relationship through the data conclusion;

[0018] S33: The diameter of the circle, i.e., the diameter at breast height of the standing tree, is obtained by using the second data relationship and the deformation variable using the Pythagorean theorem.

[0019] Furthermore, the first data relationship is:

[0020] CA=AB=C1A1=A1B1;and,AA1⊥CB;

[0021] Wherein, A1 is the contact point between the telescopic contact and the column surface; A is the original position point when the telescopic contact is assumed to be undeformed during measurement; C is the contact point between the first scale arm and the column surface; B is the contact point between the second scale arm and the column surface; C1 is the intersection point between the tangent line of A1 on the circle and the first scale arm; B1 is the intersection point between the tangent line of A1 on the circle and the second scale arm;

[0022] Second data relationship:

[0023] OA1=OB=OA+AA1; where O is the center of the circle and AA1 is the deformation produced by the spring reset sensor.

[0024] Furthermore, the preset distance is 30 mm.

[0025] The present invention also proposes a standing tree diameter at breast height measurement system, which approximates the cross section of the trunk of the standing tree to a circle, and uses a measuring device to obtain the diameter of the circle as the standing tree diameter at breast height;

[0026] The measuring device comprises a first ruler arm and a second ruler arm of equal length, a spring reset sensor disposed between the first ruler arm and the second ruler arm, and a fixed controller for fixing the spring reset sensor, the first ruler arm and the second ruler arm; the vertical distance between the spring reset sensor and the first ruler arm and the second ruler arm is greater than or equal to a preset distance; the first ruler arm, the second ruler arm and the spring reset sensor are parallel to each other and are in the same plane; the telescopic contact of the spring reset sensor is in the same horizontal plane as the ends of the first ruler arm and the second ruler arm in the same direction;

[0027] The system comprises:

[0028] The measuring module is used to make the telescopic contact of the spring reset sensor and one end of the first ruler arm and the second ruler arm contact with the vertical wood column surface in the horizontal direction;

[0029] An acquisition module is used to acquire the data relationship between the contact points when the telescopic contact, the first scale arm, and the second scale arm are all in contact with the vertical wood column surface;

[0030] The calculation module is used to obtain the deformation amount generated by the spring reset sensor during contact through a fixed controller, and obtain the diameter of the circle, that is, the standing tree breast diameter, through the deformation amount using data relations.

[0031] Furthermore, the fixed controller includes a fixer, which is arranged at one end of the telescopic contact away from the spring reset sensor; used to fix one end of the telescopic contact away from the front end of the spring reset sensor and one end of the first ruler arm and the second ruler arm on the same horizontal plane and keep them parallel.

[0032] Furthermore, the fixed controller also includes a power module, a circuit board and a controller;

[0033] The fixed controller and the spring return sensor obtain electrical energy through a power module;

[0034] The deformation amount generated by the spring return sensor is transmitted to the controller through the circuit board;

[0035] The controller is used to obtain the deformation amount generated by the spring reset sensor during contact, and obtain the diameter of the circle, that is, the diameter at breast height of the standing tree, through the deformation amount using a data relationship, and save it.

[0036] Further, the data relationship includes a first data relationship and a second data relationship, and the calculation module specifically includes:

[0037] A first data relationship unit is used to obtain, through a first data relationship, a data conclusion that the arc length from A1 to B is equal to the arc length from A1 to C, and thus the extension line of A1A must pass through the center of the circle O; wherein A1 is the contact point between the telescopic contact and the vertical wood column surface, B is the contact point between the second ruler arm and the vertical wood column surface, C is the contact point between the first ruler arm and the vertical wood column surface, and A is the original position point when it is assumed that the telescopic contact is not deformed during measurement;

[0038] A second data relationship unit, used for obtaining a second data relationship through a data conclusion;

[0039] The calculation unit is used to obtain the diameter of the circle, that is, the diameter at breast height of the standing tree, by using the Pythagorean theorem through the second data relationship and the deformation variable.

[0040] Compared with the prior art, the present invention has at least the following beneficial effects:

[0041] (1) The present invention arranges the spring return sensor in the middle of the first ruler arm and the second ruler arm of equal length, so that the first ruler arm, the second ruler arm and the spring return sensor are parallel to each other and are in the same horizontal plane, and the telescopic contact of the spring return sensor is in the same horizontal plane as the ends of the first ruler arm and the second ruler arm in the same direction, and sets the vertical distance between the spring return sensor and the first ruler arm and the second ruler arm to be greater than or equal to the preset distance. When the telescopic contact, the first ruler arm and the second ruler arm are all in contact with the column surface of the standing tree (that is, when the spring return sensor generates the maximum deformation in the measurement), the data relationship between each contact point is obtained, and the standing tree diameter at breast height is obtained according to the data relationship and the maximum deformation generated by the spring return sensor. The measuring device has a simple structure, a simple and easy measuring method, and the measured data is automatically saved by the controller, which completely solves the problems of the current products for measuring the standing tree diameter at breast height, such as complex equipment operation, difficulty in measuring in dense forests, poor anti-interference performance, high equipment cost and low measurement efficiency;

[0042] (2) The preset distance of the present invention can be adjusted according to actual conditions to measure the DBH of trees within different DBH ranges, which greatly improves the flexibility of measurement;

[0043] (3) The measuring device of the present invention has a simple structure, is lightweight, and is easy to carry in the field;

[0044] (4) The present invention can obtain the tree diameter at breast height by using the deformation amount generated by the spring reset sensor. The calculation method is simple and the data processing speed is fast, which greatly improves the measurement efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] Figure 1 This is the original state structure diagram of the measuring device;

[0046] Figure 2 The present invention is a flow chart of a method for measuring the diameter at breast height of a standing tree;

[0047] Figure 3 It is a top view of the DBH measurement structure under measurement status;

[0048] Figure 4 It is the data relationship diagram under the measurement state;

[0049] Figure 5 This is a system module diagram of a standing tree diameter at breast height measurement system. DETAILED DESCRIPTION

[0050] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

[0051] Embodiment 1

[0052] The present invention approximates the cross section of the trunk of a standing tree to a circle, and uses a measuring device to obtain the diameter of the circle as the breast diameter of the standing tree, so as to solve the problems of the existing products for measuring the breast diameter of standing trees, such as complex equipment operation, difficulty in measuring in dense forests, poor anti-interference performance, high equipment cost and low measurement efficiency. Figures 1 to 4 As shown, the present invention proposes a method for measuring the diameter at breast height of a standing tree, which approximates the cross section of the trunk of the standing tree to a circle, and uses a measuring device to obtain the diameter of the circle as the diameter at breast height of the standing tree;

[0053] The measuring device comprises a first ruler arm and a second ruler arm of equal length, a spring reset sensor disposed between the first ruler arm and the second ruler arm, and a fixed controller for fixing the spring reset sensor, the first ruler arm and the second ruler arm; the vertical distance between the spring reset sensor and the first ruler arm and the second ruler arm is greater than or equal to a preset distance; the first ruler arm, the second ruler arm and the spring reset sensor are parallel to each other and are in the same plane; the telescopic contact of the spring reset sensor is in the same horizontal plane as the ends of the first ruler arm and the second ruler arm in the same direction;

[0054] The method for measuring the standing tree diameter at breast height comprises the following steps:

[0055] S1: The retractable contact of the spring return sensor and one end of the first scale arm and the second scale arm are brought into contact with the surface of the standing wood column in the horizontal direction;

[0056] S2: Obtaining the data relationship between the contact points when the telescopic contact, the first scale arm, and the second scale arm are all in contact with the vertical wood column surface;

[0057] Specifically, when measuring, it is necessary to obtain the deformation amount X of the telescopic contact of the spring reset sensor when the first scale arm L1, the second scale arm L2 and the telescopic contact of the spring reset sensor touch the vertical wooden column surface at the same time. Figure 4 The midpoint A is the original position point when the telescopic contact is assumed to be not deformed during measurement; point A1 is the contact point between the telescopic contact and the vertical wood column surface, that is, the position point after the telescopic contact at the front end of the spring reset sensor is deformed.

[0058] S3: The deformation variable generated by the spring reset sensor during contact is obtained through a fixed controller, and the diameter of the circle, i.e., the diameter at breast height of the standing tree, is obtained through the deformation variable using the data relationship.

[0059] The fixed controller includes a fixer, which is arranged at one end of the telescopic contact away from the spring reset sensor; used to fix one end of the telescopic contact away from the front end of the spring reset sensor and one end of the first ruler arm and the second ruler arm on the same horizontal plane and keep them parallel.

[0060] The fixed controller also includes a power module, a circuit board and a controller;

[0061] The fixed controller and the spring return sensor obtain electrical energy through a power module;

[0062] The deformation amount generated by the spring return sensor is transmitted to the controller through the circuit board;

[0063] The controller is used to obtain the deformation amount generated by the spring reset sensor during contact, and obtain the diameter of the circle, that is, the diameter at breast height of the standing tree, through the deformation amount using a data relationship, and save it.

[0064] Figure 1 is a structural diagram of the measuring device in a non-measurement state, in which L1 represents the first ruler arm, L2 represents the second ruler arm, S1 and S2 represent preset distances (S1=S2), and G represents a fixed controller;

[0065] Figure 3 X in the equation is the shape variable, that is, Figure 4 The length of the line segment A1A, r represents the radius of the circle, that is Figure 4 The length of OA1 or OB;

[0066] Figure 4 Here y represents the length of OA.

[0067] The data relationship includes a first data relationship and a second data relationship. In step S3, the specific method of obtaining the circle diameter by using the data relationship through the deformation amount is:

[0068] S31: It is obtained through the first data relationship that the arc length from A1 to B is equal to the arc length from A1 to C, and thus the extension line of A1A must pass through the center of the circle O; wherein A1 is the contact point between the telescopic contact and the vertical wood column surface, B is the contact point between the second ruler arm and the vertical wood column surface, C is the contact point between the first ruler arm and the vertical wood column surface, and A is the original position point when it is assumed that the telescopic contact is not deformed during measurement;

[0069] S32: Obtaining a second data relationship through the data conclusion;

[0070] S33: The diameter of the circle, i.e., the diameter at breast height of the standing tree, is obtained by using the second data relationship and the deformation variable using the Pythagorean theorem.

[0071] The first data relationship is:

[0072] CA=AB=C1A1=A1B1;and,AA1⊥CB;

[0073] In the formula, A1 is the contact point between the telescopic contact and the surface of the vertical column; A is the original position point when it is assumed that the telescopic contact does not deform during measurement; C is the contact point between the first scale arm and the surface of the vertical column; B is the contact point between the second scale arm and the surface of the vertical column; C1 is the intersection point of the tangent of A1 on the circle and the first scale arm; B1 is the intersection point of the tangent of A1 on the circle and the second scale arm; (AA1⊥CB, C1C⊥CB, B1B⊥CB, line segment C1B1 is obtained by translating line segment CB to point A1).

[0074] Second data relationship:

[0075] OA1=OB=OA+AA1; where O is the center of the circle and AA1 is the deformation produced by the spring reset sensor.

[0076] The preset distance is 30 mm.

[0077] The specific demonstration of data relationship includes:

[0078] Step 1: Demonstration of data conclusions in the first data relationship:

[0079] 1)CA=AB=C1A1=A1B1=S1=S2=30mm;

[0080] 2) Because: AA1⊥CB

[0081] Therefore: ∠A1AB=∠A1AC=90°

[0082] And because: CA = AB

[0083] Therefore: The length of the arc from A1 to B is equal to the length of the arc from A1 to C

[0084] Thus, OA1 passes through the center of the circle;

[0085] The second step is to obtain the argument of the second data relationship through the data conclusion:

[0086] 3) Because: OA1 = OB

[0087] So: OB=OA+AA1

[0088] 4) Because: ∠A1AB=90°

[0089] So: ∠OAB=90°

[0090] 5) Through the argument of the first step and the arguments of 3) and 4), using the Pythagorean theorem, we can get:

[0091] Because: ∠OAB=90°

[0092] So: AB 2 +OA 2 =OB 2 ;

[0093] AB 2 +y 2 =OB 2 ;

[0094] AB 2 +(OB-x) 2 =OB 2 ;

[0095] 30 2 +(OB-x) 2 =OB 2 ;(Substitute data)

[0096] 30 2 +x 2 +OB 2 -2xOB=OB 2 ;

[0097] 2xOB=30 2 +x 2 ;

[0098]

[0099] The breast diameter of the standing tree is twice OB.

[0100] Since the National Technical Regulations for Continuous Inventory of Forest Resources stipulate that the diameter at breast height of standing trees should be greater than 60 mm, the present invention sets the preset distance to 30 mm, which can be adjusted according to actual conditions.

[0101] The present invention arranges a spring return sensor in the middle of a first ruler arm and a second ruler arm of equal length, so that the first ruler arm, the second ruler arm and the spring return sensor are parallel to each other and are in the same horizontal plane, and the telescopic contact of the spring return sensor is in the same horizontal plane as the ends of the first ruler arm and the second ruler arm in the same direction, and sets the vertical distance between the spring return sensor and the first ruler arm and the second ruler arm to be greater than or equal to a preset distance. When the telescopic contact, the first ruler arm and the second ruler arm are all in contact with the column surface of the standing tree (that is, when the spring return sensor generates the maximum deformation variable in the measurement), the data relationship between each contact point is obtained, and the standing tree diameter at breast height is obtained according to the data relationship and the maximum deformation variable generated by the spring return sensor. The measuring device has a simple structure, a simple and easy measuring method, and the measuring data is automatically saved by a controller, which completely solves the problems of complex equipment operation, difficulty in measuring in dense forests, poor anti-interference, high equipment cost and low measuring efficiency in the current products for measuring the standing tree diameter at breast height.

[0102] Embodiment 2

[0103] like Figure 5 As shown, the present invention also proposes a standing tree diameter at breast height measurement system, which approximates the cross section of the standing tree trunk to a circle, and uses a measuring device to obtain the diameter of the circle as the standing tree diameter at breast height;

[0104] The measuring device comprises a first ruler arm and a second ruler arm of equal length, a spring reset sensor disposed between the first ruler arm and the second ruler arm, and a fixed controller for fixing the spring reset sensor, the first ruler arm and the second ruler arm; the vertical distance between the spring reset sensor and the first ruler arm and the second ruler arm is greater than or equal to a preset distance; the first ruler arm, the second ruler arm and the spring reset sensor are parallel to each other and are in the same plane; the telescopic contact of the spring reset sensor is in the same horizontal plane as the ends of the first ruler arm and the second ruler arm in the same direction;

[0105] The system comprises:

[0106] The measuring module is used to make the telescopic contact of the spring reset sensor and one end of the first ruler arm and the second ruler arm contact with the vertical wood column surface in the horizontal direction;

[0107] An acquisition module is used to acquire the data relationship between the contact points when the telescopic contact, the first scale arm, and the second scale arm are all in contact with the vertical wood column surface;

[0108] The calculation module is used to obtain the deformation amount generated by the spring reset sensor during contact through a fixed controller, and obtain the diameter of the circle, that is, the standing tree breast diameter, through the deformation amount using data relations.

[0109] The fixed controller includes a fixer, which is arranged at one end of the telescopic contact away from the spring reset sensor; used to fix one end of the telescopic contact away from the front end of the spring reset sensor and one end of the first ruler arm and the second ruler arm on the same horizontal plane and keep them parallel.

[0110] The fixed controller also includes a power module, a circuit board and a controller;

[0111] The fixed controller and the spring return sensor obtain electrical energy through a power module;

[0112] The deformation amount generated by the spring return sensor is transmitted to the controller through the circuit board;

[0113] The controller is used to obtain the deformation amount generated by the spring reset sensor during contact, and obtain the diameter of the circle, that is, the diameter at breast height of the standing tree, through the deformation amount using a data relationship, and save it.

[0114] The data relationship includes a first data relationship and a second data relationship, and the calculation module specifically includes:

[0115] A first data relationship unit is used to obtain, through a first data relationship, a data conclusion that the arc length from A1 to B is equal to the arc length from A1 to C, and thus the extension line of A1A must pass through the center of the circle O; wherein A1 is the contact point between the telescopic contact and the vertical wood column surface, B is the contact point between the second ruler arm and the vertical wood column surface, C is the contact point between the first ruler arm and the vertical wood column surface, and A is the original position point when it is assumed that the telescopic contact is not deformed during measurement;

[0116] A second data relationship unit, used for obtaining a second data relationship through a data conclusion;

[0117] The calculation unit is used to obtain the diameter of the circle, that is, the diameter at breast height of the standing tree, by using the Pythagorean theorem through the second data relationship and the deformation variable.

[0118] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0119] In addition, in the present invention, descriptions such as "first", "second", "one", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0120] In the present invention, unless otherwise clearly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0121] In addition, the technical solutions between the various embodiments of the present invention can be combined with each other, but it must be based on the fact that ordinary technicians in the field can implement it. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

Claims

1. A method for measuring the diameter at breast height of a standing tree, characterized in that: The cross section of the trunk of a standing tree is approximated as a circle, and the diameter of the circle is obtained as the breast height diameter of the standing tree by using a measuring device; The measuring device comprises a first ruler arm and a second ruler arm of equal length, a spring reset sensor disposed between the first ruler arm and the second ruler arm, and a fixed controller for fixing the spring reset sensor, the first ruler arm and the second ruler arm; the vertical distance between the spring reset sensor and the first ruler arm and the second ruler arm is greater than or equal to a preset distance; the first ruler arm, the second ruler arm and the spring reset sensor are parallel to each other and are in the same plane; the telescopic contact of the spring reset sensor is in the same horizontal plane as the ends of the first ruler arm and the second ruler arm in the same direction; The method for measuring the standing tree diameter at breast height comprises the following steps: S1: The retractable contact of the spring return sensor and one end of the first scale arm and the second scale arm are brought into contact with the surface of the standing wood column in the horizontal direction; S2: Obtaining the data relationship between the contact points when the telescopic contact, the first scale arm, and the second scale arm are all in contact with the vertical wood column surface; S3: obtaining the deformation amount generated by the spring reset sensor during contact through a fixed controller, and obtaining the diameter of the circle, i.e., the diameter at breast height of the tree, through the deformation amount using a data relationship; The data relationship includes a first data relationship and a second data relationship. In step S3, the specific method of obtaining the circle diameter by using the data relationship through the deformation amount is: S31: Obtained through the first data relationship The length of the arc to B is equal to The arc length to C, thus The extension line of must pass through the center of the circle O; among them, is the contact point between the telescopic contact and the column surface, B is the contact point between the second scale arm and the column surface, C is the contact point between the first scale arm and the column surface, and A is the original position point when it is assumed that the telescopic contact does not deform during measurement; S32: Obtaining a second data relationship through the data conclusion; S33: using the second data relationship and the deformation variable and using the Pythagorean theorem, the diameter of the circle, i.e., the diameter at breast height of the standing tree, is obtained; The first data relationship is: ;and, ; In the formula, is the contact point between the telescopic contact and the surface of the standing wood column; A is the original position point when the telescopic contact is assumed to be not deformed during measurement; C is the contact point between the first scale arm and the surface of the standing wood column; B is the contact point between the second scale arm and the surface of the standing wood column; The intersection of the tangent line on the circle and the first arm of the ruler; for The intersection of the tangent line on the circle and the second arm of the ruler; The second data relationship is: ; In the formula, O is the center of the circle, That is, the deformation amount produced by the spring return sensor.

2. A method for measuring the diameter at breast height of a standing tree according to claim 1, characterized in that: The fixed controller includes a fixer, which is arranged at one end of the telescopic contact away from the spring reset sensor; used to fix one end of the telescopic contact away from the front end of the spring reset sensor and one end of the first ruler arm and the second ruler arm on the same horizontal plane and keep them parallel.

3. A method for measuring the diameter at breast height of a standing tree according to claim 2, characterized in that: The fixed controller also includes a power module, a circuit board and a controller; The fixed controller and the spring return sensor obtain electrical energy through a power module; The deformation amount generated by the spring return sensor is transmitted to the controller through the circuit board; The controller is used to obtain the deformation amount generated by the spring reset sensor during contact, and obtain the diameter of the circle, that is, the diameter at breast height of the standing tree, through the deformation amount using a data relationship, and save it.

4. The method for measuring the diameter at breast height of a standing tree according to claim 1, characterized in that: The preset distance is 30 mm.

5. A standing tree diameter at breast height measurement system, characterized in that: The cross section of the trunk of a standing tree is approximated as a circle, and the diameter of the circle is obtained as the breast height diameter of the standing tree by using a measuring device; The measuring device comprises a first ruler arm and a second ruler arm of equal length, a spring reset sensor disposed between the first ruler arm and the second ruler arm, and a fixed controller for fixing the spring reset sensor, the first ruler arm and the second ruler arm; the vertical distance between the spring reset sensor and the first ruler arm and the second ruler arm is greater than or equal to a preset distance; the first ruler arm, the second ruler arm and the spring reset sensor are parallel to each other and are in the same plane; the telescopic contact of the spring reset sensor is in the same horizontal plane as the ends of the first ruler arm and the second ruler arm in the same direction; The system comprises: The measuring module is used to make the telescopic contact of the spring reset sensor and one end of the first ruler arm and the second ruler arm contact with the vertical wood column surface in the horizontal direction; An acquisition module is used to acquire the data relationship between the contact points when the telescopic contact, the first scale arm, and the second scale arm are all in contact with the vertical wood column surface; A calculation module is used to obtain the deformation amount generated by the spring reset sensor during contact through a fixed controller, and obtain the diameter of the circle, i.e., the diameter at breast height of the standing tree, through the deformation amount using a data relationship; The data relationship includes a first data relationship and a second data relationship, and the calculation module specifically includes: The first data relationship unit is used to obtain the first data relationship The length of the arc to B is equal to The arc length to C, thus The extension line of must pass through the center of the circle O; among them, is the contact point between the telescopic contact and the column surface, B is the contact point between the second scale arm and the column surface, C is the contact point between the first scale arm and the column surface, and A is the original position point when it is assumed that the telescopic contact does not deform during measurement; A second data relationship unit, used for obtaining a second data relationship through a data conclusion; A calculation unit, used for obtaining the diameter of the circle, i.e., the diameter at breast height of the standing tree, by using the second data relationship and the deformation variable using the Pythagorean theorem; The first data relationship is: ;and, ; In the formula, is the contact point between the telescopic contact and the surface of the standing wood column; A is the original position point when the telescopic contact is assumed to be not deformed during measurement; C is the contact point between the first scale arm and the surface of the standing wood column; B is the contact point between the second scale arm and the surface of the standing wood column; The intersection of the tangent line on the circle and the first arm of the ruler; for The intersection of the tangent line on the circle and the second arm of the ruler; The second data relationship is: ; In the formula, O is the center of the circle, That is, the deformation amount produced by the spring return sensor.

6. A standing tree diameter at breast height measurement system according to claim 5, characterized in that: The fixed controller includes a fixer, which is arranged at one end of the telescopic contact away from the spring reset sensor; used to fix one end of the telescopic contact away from the front end of the spring reset sensor and one end of the first ruler arm and the second ruler arm on the same horizontal plane and keep them parallel.

7. A standing tree diameter at breast height measurement system according to claim 6, characterized in that: The fixed controller also includes a power module, a circuit board and a controller; The fixed controller and the spring return sensor obtain electrical energy through a power module; The deformation amount generated by the spring return sensor is transmitted to the controller through the circuit board; The controller is used to obtain the deformation amount generated by the spring reset sensor during contact, and obtain the diameter of the circle, that is, the diameter at breast height of the standing tree, through the deformation amount using a data relationship, and save it.

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