Tree crown width measuring device and measuring method

Abstract

The present invention provides a tree crown width measurement device and a measurement method, which belongs to the technical field of tree crown width measurement, including a first measuring point and a second measuring point arranged in sequence along the axial direction on a first pole; a third measuring point arranged on a second pole; a fourth measuring point arranged on a movable pole; and a calculation module calculating the position information of the point to be measured on the edge of the tree crown projection according to the position information of the first measuring point, the position information of the second measuring point, the position information of the third measuring point, and the position information of the fourth measuring point. Based on the position characteristics of the tree crown width, the present invention designs a positioning method that matches the position characteristics of the crown edge, and does not require manual measurement of each tree in multiple directions. The measurement can be completed by simply changing the position of the movable pole, which is simple, fast, and accurate; simple to operate and easy to carry. Compared with the existing manual measurement method, it is more suitable for accurate measurement of the crown width in complex terrain conditions such as forests.

Description

Technical Field

[0001] The present invention relates to the technical field of tree crown width measurement, and in particular to a tree crown width measurement device and a measurement method. Background Art

[0002] Forest survey is a basic work for obtaining forest resource information and making various analytical decisions, and different methods can obtain different data. As a basic tree measurement factor, tree crown width is of great significance to the determination of forest density and biomass, as well as forest planning, management and protection.

[0003] In the traditional method of measuring the crown width of a tree, a survey is conducted in a standard field: for seedlings, a tape measure can be used to directly record the width in the north-south, east-west and other directions and record the values. The average value is the crown width of the seedling. However, for larger trees, one method is to roughly measure the width in the east-west direction and the width in the north-south direction through the projection of the midday sun and calculate the average value. The other method is to pull down the tape measure based on the principle of vertical projection line to measure the average width in the east-west direction and the width in the north-south direction. However, both methods are time-consuming and labor-intensive, and the accuracy rate is very low.

[0004] The refractor is an observation mirror based on the principle of light refraction, and is made by borrowing the shape and structure of the periscope. When a person's horizontal perspective is aligned with the eyepiece of the refractor, it will pass through the objective lens from directly above. There is a crosshair in the center of the objective lens, which can be used to align the edge of the tree crown. It allows measurement personnel to no longer look up and visually observe, which improves the convenience and comfort of scientific researchers while ensuring accuracy. However, in the presence of obstacles, it is impossible to accurately measure the crown width of the tree due to the obstruction of the obstacles. Summary of the invention

[0005] The object of the present invention is to provide a tree crown width measuring device and a measuring method to solve at least one technical problem existing in the above-mentioned background technology.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions:

[0007] In a first aspect, the present invention provides a tree crown width measuring device, comprising:

[0008] A first benchmark is vertically arranged on the ground outside the vertical projection range of the tree crown; a first measuring point and a second measuring point are arranged in sequence along the axial direction on the first benchmark;

[0009] A second benchmark is vertically arranged on the ground outside the vertical projection range of the tree crown, and the line connecting the second benchmark and the first benchmark does not intersect the projection range of the tree crown; a third measuring point is arranged on the second benchmark;

[0010] A movable benchmark is movably arranged vertically on the ground at the edge of the vertical projection range of the tree crown; a fourth measuring point is arranged on the movable benchmark;

[0011] A calculation module is used to calculate the position information of the point to be measured on the edge of the crown projection according to the position information of the first measurement point, the position information of the second measurement point, the position information of the third measurement point and the position information of the fourth measurement point.

[0012] Preferably, the first measurement point is a first RFID reader, the second measurement point is a second RFID reader, the third measurement point is a third RFID reader, and the fourth measurement point is a fourth RFID reader.

[0013] Preferably, a refractor is also provided at the top of the movable pole.

[0014] Preferably, a circular level is also provided on the movable benchmark.

[0015] Preferably, the calculation module comprises a storage unit for storing the position information of the first measurement point, the position information of the second measurement point, the position information of the third measurement point and the position information of the fourth measurement point.

[0016] Preferably, the storage unit is also used to store position information of multiple points to be measured on the edge of the tree crown.

[0017] Preferably, the first measuring point is above the second measuring point.

[0018] In a second aspect, the present invention provides a method for measuring a tree crown width using the device as described above, comprising:

[0019] Acquire the position information of the first measuring point, the position information of the second measuring point, the position information of the third measuring point, and the position information of the fourth measuring point; wherein,

[0020] The first benchmark is vertically arranged on the ground outside the vertical projection range of the tree crown; the second benchmark is vertically arranged on the ground outside the vertical projection range of the tree crown, and the line connecting the second benchmark and the first benchmark does not intersect with the tree crown projection range; the mobile benchmark is vertically arranged on the ground at the edge of the tree crown vertical projection range, and coincides with the position of the point to be measured on the edge of the tree crown projection;

[0021] The position information of the point to be measured on the edge of the tree crown projection is calculated according to the position information of the first measuring point, the position information of the second measuring point, the position information of the third measuring point and the position information of the fourth measuring point.

[0022] Preferably, the position information of the first measuring point includes the vertical distance from the first measuring point to the ground, the position information of the second measuring point includes the vertical distance from the second measuring point to the ground, the position information of the third measuring point includes the vertical distance from the third measuring point to the ground, and the position information of the fourth measuring point includes the vertical distance from the fourth measuring point to the ground.

[0023] Preferably, calculating the position information of the point to be measured on the edge of the crown projection includes:

[0024] A horizontal two-dimensional coordinate system is established with the horizontal line between the first and second benchmarks as the horizontal axis and the midpoint of the horizontal line as the origin;

[0025] The coordinates of the point to be measured in the horizontal two-dimensional coordinate system are calculated based on the vertical distance from the first measuring point to the ground, the vertical distance from the second measuring point to the ground, the vertical distance from the third measuring point to the ground, and the vertical distance from the fourth measuring point to the ground in combination with the Pythagorean theorem.

[0026] The beneficial effects of the present invention are as follows: based on the positional characteristics of the tree crown width, a positioning method matching the positional characteristics of the tree crown edge is designed, without the need for manual measurement of each tree in multiple directions, and the measurement can be completed by simply changing the position of the mobile benchmark, which is simple, fast and accurate; simple to operate and easy to carry, and compared with the existing manual measurement method, it is more suitable for accurate measurement of the crown width in complex terrain conditions such as forests.

[0027] Additional aspects and advantages of the present invention will be given in part in the following description, which will become obvious from the following description, or may be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0029] Figure 1 A schematic diagram of the location of the mobile pole according to an embodiment of the present invention.

[0030] Figure 2 It is a schematic diagram of constructing a horizontal two-dimensional coordinate system according to an embodiment of the present invention.

[0031] Figure 3 This is a schematic diagram of the principle structure of the tree crown width measuring device described in an embodiment of the present invention.

[0032] Figure 4The figure is a schematic diagram of the principle of calculating the horizontal distance between the first benchmark and the second benchmark according to an embodiment of the present invention.

[0033] Figure 5 The figure is a schematic diagram of the principle of calculating the horizontal distance between the first benchmark and the moving benchmark according to an embodiment of the present invention.

[0034] Figure 6 The figure is a schematic diagram of the principle of calculating the horizontal distance between the second benchmark and the moving benchmark according to an embodiment of the present invention.

[0035] Among them: 1-first fixed reader; 2-second fixed reader; 3-first benchmark; 4-second benchmark; 5-third fixed reader; 6-movable benchmark; 7-movable reader; 8-refracting mirror; 9-circular level. DETAILED DESCRIPTION

[0036] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements with the same or similar functions. The embodiments described below by the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be interpreted as limiting the present invention.

[0037] Those skilled in the art will understand that unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by those skilled in the art to which this invention belongs.

[0038] It should also be understood that terms, such as those defined in commonly used dictionaries, should be understood to have a meaning consistent with that in the context of the prior art and will not be interpreted in an idealized or overly formal sense unless as defined herein.

[0039] Those skilled in the art will appreciate that, unless otherwise stated, the singular forms "a", "an", "said" and "the" used herein may also include plural forms. It should be further understood that the term "comprising" used in the specification of the present invention refers to the presence of the features, integers, steps, operations, elements and / or components, but does not exclude the presence or addition of one or more other features, integers, steps, operations, elements and / or groups thereof.

[0040] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine different embodiments or examples described in this specification and the features of different embodiments or examples, unless they are contradictory.

[0041] In the description of this specification, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0042] In the description of this specification, the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present technology and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present technology.

[0043] Unless otherwise clearly specified or limited, the terms "installed", "connected", "connected", and "set" should be understood in a broad sense, for example, they can be fixedly connected or set, or detachably connected or set, or integrally connected or set. For ordinary technicians in this field, the specific meanings of the above terms in this technology can be understood according to specific circumstances.

[0044] To facilitate understanding of the present invention, the present invention is further explained below with reference to specific embodiments in conjunction with the accompanying drawings, and the specific embodiments do not constitute a limitation on the embodiments of the present invention.

[0045] Those skilled in the art should understand that the drawings are merely schematic diagrams of embodiments, and the components in the drawings are not necessarily necessary for implementing the present invention.

[0046] Example 1

[0047] Embodiment 1 of the present invention provides a tree crown width measuring device, the tree crown width measuring device comprising:

[0048] The first benchmark is vertically arranged on the ground outside the vertical projection range of the tree crown; the first measuring point and the second measuring point are arranged in sequence along the axial direction on the first benchmark.

[0049] The second benchmark is vertically arranged on the ground outside the vertical projection range of the tree crown, and the line connecting the second benchmark and the first benchmark does not intersect with the projection range of the tree crown; the third measuring point is arranged on the second benchmark.

[0050] A movable benchmark is movably arranged vertically on the ground at the edge of the vertical projection range of the tree crown; a fourth measuring point is arranged on the movable benchmark.

[0051] A calculation module is used to calculate the position information of the point to be measured on the edge of the crown projection according to the position information of the first measurement point, the position information of the second measurement point, the position information of the third measurement point and the position information of the fourth measurement point.

[0052] In the present embodiment 1, when the above device is used, first, the first benchmark is vertically fixed at a certain position on the ground outside the vertical projection range of the tree crown, and the vertical distance from the first measuring point to the ground and the vertical distance from the second measuring point to the ground are manually measured and recorded by using tools such as a tape measure. Then the second benchmark is vertically fixed at another position on the ground outside the vertical projection range of the tree crown, and the line connecting the second benchmark does not intersect with the vertical projection of the tree crown. The vertical distance from the third measuring point to the ground is manually measured and recorded by using tools such as a tape measure. The mobile benchmark is vertically set on the edge of the vertical projection of the tree crown to coincide with the point to be measured on the edge, and the vertical distance from the fourth measuring point to the ground is manually measured using tools such as a tape measure and recorded.

[0053] Use a tape measure or other tool to measure and record the distance between the first measuring point and the third measuring point, the distance between the first measuring point and the fourth measuring point, the distance between the second measuring point and the third measuring point, the distance between the second measuring point and the fourth measuring point, and the distance between the third measuring point and the fourth measuring point.

[0054] The position information of the point to be measured is calculated according to the above measured distance.

[0055] The calculation module includes a storage unit for storing the position information of the first measurement point, the second measurement point, the third measurement point and the fourth measurement point, and also for storing the position information of multiple points to be measured on the edge of the tree crown.

[0056] The first measuring point is above the second measuring point.

[0057] In this embodiment 1, when the crown width of a tree is measured using the above-mentioned measuring device, the position information of the first measuring point, the position information of the second measuring point, the position information of the third measuring point, and the position information of the fourth measuring point are obtained; wherein,

[0058] The first benchmark is vertically set on the ground outside the vertical projection range of the tree crown; the second benchmark is vertically set on the ground outside the vertical projection range of the tree crown, and the line connecting the second benchmark and the first benchmark does not intersect with the tree crown projection range; the mobile benchmark is vertically set on the ground at the edge of the tree crown vertical projection range, and coincides with the position of the measured point on the edge of the tree crown projection.

[0059] The position information of the point to be measured on the edge of the tree crown projection is calculated according to the position information of the first measuring point, the position information of the second measuring point, the position information of the third measuring point and the position information of the fourth measuring point.

[0060] Specifically, the position information of the first measuring point includes the vertical distance from the first measuring point to the ground, the position information of the second measuring point includes the vertical distance from the second measuring point to the ground, the position information of the third measuring point includes the vertical distance from the third measuring point to the ground, and the position information of the fourth measuring point includes the vertical distance from the fourth measuring point to the ground.

[0061] Specifically, calculating the position information of the point to be measured on the edge of the crown projection includes:

[0062] A horizontal two-dimensional coordinate system is established with the horizontal line between the first and second benchmarks as the horizontal axis and the midpoint of the horizontal line as the origin;

[0063] The coordinates of the point to be measured in the horizontal two-dimensional coordinate system are calculated based on the vertical distance from the first measuring point to the ground, the vertical distance from the second measuring point to the ground, the vertical distance from the third measuring point to the ground, and the vertical distance from the fourth measuring point to the ground in combination with the Pythagorean theorem.

[0064] The coordinates of the points to be measured are calculated as follows:

[0065] Assume that the projection points of the first measuring point A, the third measuring point C and the fourth measuring point D on the same horizontal plane are A", C", and D" respectively, and D" coincides with the vertical projection of the point to be measured.

[0066] when ≥ , the position coordinates of D" are: ;

[0067] when < When , the position coordinates of D" are: ;

[0068] in, It represents the distance between points A" and D". It represents the distance between points C" and D". Indicates the distance between points A" and C". , S represents the area of ​​triangle A"D"C", , It is 1 / 2 of the perimeter of triangle A"D"C".

[0069] Example 2

[0070] For Example 1, if a tape measure or total station is not used to measure the refractor, the plane coordinates and height difference of each measuring point are manually measured. When the refractor circles the crown width, the RFID electronic tag phase difference method can be used to measure and calculate the crown width area.

[0071] RFID (radio frequency identification) is a technology that uses radio signals to identify specific targets and read and write related data without establishing mechanical or optical contact between the identification system and the specific target, which enables it to ignore dust, fog, plastic, paper, wood and various obstacles. The radio signal is tuned into an infinite frequency low electromagnetic field to transmit data from the tag attached to the object to automatically identify and track the object. The tag contains electronically stored information and can be tracked and identified within a set range. That is, the radio frequency tag does not need to be within the line of sight of the identifier, but can also be embedded in the tracked object, and then the frequency signal is used to transmit the information from the RFID tag to the RFID reader to track the object, which is simple and fast.

[0072] The tree crown width measuring device provided in this embodiment 2 includes a first fixed measuring rod, a second fixed measuring rod and a movable measuring rod.

[0073] The first fixed measuring rod includes a first benchmark rod 3, which is vertically arranged on the ground outside the vertical projection range of the tree crown; the first measuring point (second fixed reader 2) and the second measuring point (first fixed reader 1) are arranged in sequence along the axial direction on the first benchmark rod 3.

[0074] The second fixed measuring pole includes a second benchmark pole 4, which is vertically arranged on the ground outside the vertical projection range of the tree crown, and the line connecting the second benchmark pole 4 and the first benchmark pole 3 does not intersect with the projection range of the tree crown; a third measuring point (third fixed reader 5) is arranged on the second benchmark pole 4.

[0075] The mobile pole 6 is movably arranged vertically on the ground at the edge of the vertical projection range of the tree crown; the mobile pole 6 is provided with a fourth measuring point (mobile reader 7).

[0076] A calculation module is used to calculate the position information of the point to be measured on the edge of the crown projection according to the position information of the first measurement point, the position information of the second measurement point, the position information of the third measurement point and the position information of the fourth measurement point.

[0077] Specifically, in this embodiment 2, the first fixed reader and the second reader are both set on the first pole, the first fixed reader is set at the lower part of the first pole, and the second fixed reader is set at a position greater than 2 meters above the first fixed reader, preferably 2-4 meters, and more preferably 3 meters.

[0078] The second fixed measuring rod includes a second benchmark and a third fixed reader, and the third fixed reader is arranged on the second benchmark. The mobile measuring rod includes a mobile benchmark, a mobile reader, a refractor 8, and a circular level 9, and the mobile reader and the circular level are arranged on the mobile benchmark, and the refractor is located at the top of the mobile benchmark.

[0079] The mobile reader is provided with an input operation interface and a signal transmission button, which facilitates inputting required distance information into the mobile reader, transmitting a measurement signal, and storing the measurement information.

[0080] like Figures 1 to 3 As shown, in this embodiment 2, when using the above-mentioned device to measure the tree crown width, the following steps are included:

[0081] (1) First, place the first pole outside the tree canopy and input the heights of the first fixed reader and the second fixed reader relative to the ground into the mobile reader;

[0082] (2) Then fix the mobile reader, refractor and circular level on the second pole, input the height of the second pole into the mobile reader, and then move it to a point outside the tree canopy that is different from the first pole but on the same side as the first pole. Fix the second pole on the ground, remove the mobile reader, refractor and circular level from the second pole, replace the third fixed reader on the second pole, connect the first pole and the second pole, and take the horizontal line between the two poles as the horizontal line. Axis, with the midpoint of the horizontal line segment as the origin, and perpendicular to The imaginary straight line of the axis is Axis, establish a horizontal rectangular coordinate system to determine the limits of the measurement, such as Figure 2 As shown;

[0083] (3) Then fix the mobile reader, the refractor and the circular level removed from the second pole to the mobile pole, and input the height of the mobile reader relative to the ground on the mobile pole into the mobile reader;

[0084] (4) During measurement, the mobile pole moves along the edge of the tree crown. When the mobile pole is moved to the point to be measured and the bubble of the circular level is in the center, each reader transmits electric waves to each other, which are then reflected by the electronic tags in each reader and received by each fixed reader. By reading the phase difference between the emission phase and the reception phase of the electric wave emitted by each reader, the distance between the electronic tag and each reader is determined and then transmitted to the mobile reader. The mobile reader calculates the horizontal and vertical distances between the readers to determine the position coordinates of the point on the edge of the tree crown.

[0085] (5) Each time you move a certain distance, press the storage key to store the location information of that point. Repeat the above process until all the tree crown edges have been measured.

[0086] like Figures 4 to 6 As shown, the method for calculating the distance between fixed readers is as follows:

[0087] It is known that the heights of the first fixed reader (assuming it is fixed at point A of the first pole), the second fixed reader (assuming it is fixed at point B of the first pole), and the third fixed reader (assuming it is fixed at point C of the second pole) relative to the ground are , , , read distances AB, BC, AC, according to the cosine theorem:

[0088] , find ∠ABC, so the horizontal distance between the first and second poles is: .

[0089] Assume that the first and second poles contact the ground at points A' and C' respectively, and the height difference between the two contact points is If the calculation result is greater than 0, it means that the contact point (A') between the first marker and the ground is lower than the contact point (C') between the second marker and the ground; otherwise, it is higher; if the calculation result is equal to 0, it means that the contact point between the first marker and the ground and the contact point between the second marker and the ground are at the same level.

[0090] The method to calculate the distance between the mobile reader and the fixed reader is as follows:

[0091] The mobile reader is fixed on the mobile pole at position D. The mobile pole moves only on one side of the line connecting the first pole and the second pole. The contact point between the mobile pole and the ground is D'. The horizontal distance between the mobile reader and the first fixed pole and the second fixed pole is and ,in, , The calculation method and Same, the height difference between the first pole, the moving pole and the ground at the contact point The calculation method is the same as .

[0092] Assume that the contact points of the first pole and the moving pole with the ground are A' and D' respectively, and the height difference between the two contact points is If calculated >0, indicating that the contact point between the first pole and the ground (A') is lower than the contact point between the moving pole and the ground (D'), otherwise, it is higher; if =0, it means that the contact point between the first pole and the ground and the contact point between the moving pole and the ground are at the same level. Similarly, the relative heights between the contact points between the first pole and the second pole and the ground can be determined.

[0093] The height difference between the contact point between the second pole, the moving pole and the ground If calculated >0, indicating that the contact point between the moving pole and the ground (D') is higher than the contact point between the second pole and the ground (C), otherwise, it is lower; if =0, it means that the contact point between the mobile pole and the ground is at the same level as the contact point between the mobile pole and the ground. Read the distance CD, from which the horizontal distance between the mobile reader and the third fixed reader can be calculated. .

[0094] The above calculation methods are all pre-set in the mobile reader. When the mobile reader receives the signal from the fixed reader and calculates the corresponding distance, it can quickly calculate according to the pre-set algorithm and give the position information of the crown edge of the tree to be measured. Every time it moves to a point, press the storage key to store the position information of the point, and the system will automatically calculate the coordinates of the point. Repeat the above process until all the trees in the sample plot are measured.

[0095] (6) After obtaining the relevant distance information of a measuring point, the coordinates of the measuring point are calculated as follows:

[0096] Assume that the projection points of the first measuring point A, the third measuring point C and the fourth measuring point D on the same horizontal plane are A", C", and D" respectively, and D" coincides with the vertical projection of the point to be measured.

[0097] when ≥ , the position coordinates of D" are: ;

[0098] when < When , the position coordinates of D" are: ;

[0099] in, It represents the distance between points A" and D". It represents the distance between points C" and D". Indicates the distance between points A" and C". , S represents the area of ​​triangle A"D"C", , It is 1 / 2 of the perimeter of triangle A"D"C".

[0100] Therefore, through the processing of this system, the coordinates of all measuring points can be obtained, so the crown width in multiple directions can be calculated. Moreover, when the measuring points are as dense as possible, a higher accuracy can be guaranteed, that is, data closer to the actual crown width can be obtained.

[0101] In summary, the tree crown width measuring device and the measuring method described in the embodiment of the present invention are based on the position characteristics of the tree crown width, use a refractor as the main observation equipment, and through the principle of light refraction, convert the vertical line of sight of a person looking up into a horizontal line emitted from the eyes and then refracted upward, freeing the observer's line of sight and being able to more accurately align with the edge of the tree crown. A positioning method that matches the position characteristics of the edge of the tree crown is designed, combined with the characteristics of the phase difference ranging of the RFID technology, and then using the RFID technology to provide the distance information required by this algorithm, a technology and method that can accurately calculate the crown width is proposed. This measurement method does not require manual measurement of each tree in multiple directions with a tape measure. It only needs to change the position of the mobile benchmark and press the storage key on the mobile reader to complete the measurement. It is simple, fast and accurate. At the same time, the present invention is simple to operate and easy to carry. Compared with the existing manual measurement method, the measurement system of the present invention is more suitable for accurate measurement of crown width in complex terrain conditions such as forests.

[0102] The above description is only a preferred embodiment of the present disclosure and is not intended to limit the present disclosure. For those skilled in the art, the present disclosure may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present disclosure shall be included in the protection scope of the present disclosure.

[0103] Although the above describes the specific implementation methods of the present disclosure in conjunction with the accompanying drawings, it is not intended to limit the scope of protection of the present disclosure. Technical personnel in the relevant field should understand that various modifications or variations that can be made by those skilled in the art without creative work on the basis of the technical solution disclosed in the present invention should be included in the scope of protection of the present invention.

Claims

1. A tree crown width measuring device, characterized in that: include: A first benchmark is vertically arranged on the ground outside the vertical projection range of the tree crown; a first measuring point and a second measuring point are arranged in sequence along the axial direction on the first benchmark; A second benchmark is vertically arranged on the ground outside the vertical projection range of the tree crown, and the line connecting the second benchmark and the first benchmark does not intersect the projection range of the tree crown; a third measuring point is arranged on the second benchmark; A movable benchmark is movably arranged vertically on the ground at the edge of the vertical projection range of the tree crown; a fourth measuring point is arranged on the movable benchmark; A calculation module, used to calculate the position information of the point to be measured on the edge of the crown projection according to the position information of the first measurement point, the position information of the second measurement point, the position information of the third measurement point and the position information of the fourth measurement point; A reflector is also provided on the top of the movable pole; The movable benchmark is also provided with a circular level; The calculation module includes a storage unit for storing the position information of the first measurement point, the position information of the second measurement point, the position information of the third measurement point, and the position information of the fourth measurement point; The storage unit is also used to store the position information of multiple points to be measured on the edge of the tree crown.

2. The tree crown width measuring device according to claim 1, characterized in that: The first measurement point is a first RFID reader, the second measurement point is a second RFID reader, the third measurement point is a third RFID reader, and the fourth measurement point is a fourth RFID reader.

3. The tree crown width measuring device according to any one of claims 1-2, characterized in that: The first measuring point is above the second measuring point.

4. A method for measuring tree crown width using the device according to any one of claims 1 to 3, characterized in that: include: Acquire the position information of the first measuring point, the position information of the second measuring point, the position information of the third measuring point, and the position information of the fourth measuring point; wherein, The first benchmark is vertically arranged on the ground outside the vertical projection range of the tree crown; the second benchmark is vertically arranged on the ground outside the vertical projection range of the tree crown, and the line connecting the second benchmark and the first benchmark does not intersect with the tree crown projection range; the mobile benchmark is vertically arranged on the ground at the edge of the tree crown vertical projection range, and coincides with the position of the point to be measured on the edge of the tree crown projection; The position information of the point to be measured on the edge of the tree crown projection is calculated according to the position information of the first measuring point, the position information of the second measuring point, the position information of the third measuring point and the position information of the fourth measuring point.

5. The method for measuring tree crown width according to claim 4, characterized in that: The position information of the first measuring point includes the vertical distance from the first measuring point to the ground, the position information of the second measuring point includes the vertical distance from the second measuring point to the ground, the position information of the third measuring point includes the vertical distance from the third measuring point to the ground, and the position information of the fourth measuring point includes the vertical distance from the fourth measuring point to the ground.

6. The method for measuring tree crown width according to claim 5, characterized in that: Calculating the position information of the point to be measured on the edge of the crown projection includes: A horizontal two-dimensional coordinate system is established with the horizontal line between the first and second benchmarks as the horizontal axis and the midpoint of the horizontal line as the origin; The coordinates of the point to be measured in the horizontal two-dimensional coordinate system are calculated based on the vertical distance from the first measuring point to the ground, the vertical distance from the second measuring point to the ground, the vertical distance from the third measuring point to the ground, and the vertical distance from the fourth measuring point to the ground in combination with the Pythagorean theorem.

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