A device for measuring lateral coverage of vegetation

Abstract

The present invention relates to a device for measuring the lateral coverage of vegetation, and belongs to the technical field of vegetation ecological monitoring. The device for measuring the lateral coverage of vegetation includes: a camera bracket, a camera fixing crossbar, two camera height adjustment brackets, two hanging background curtain brackets, a curtain and a curtain supporting crossbar, a camera fixing crossbar is clamped between the two camera height adjustment brackets, a camera bracket is slidably arranged on the camera fixing crossbar, an adjustment mechanism for adjusting the camera fixing crossbar to a horizontal state is arranged on the two camera height adjustment brackets, a curtain supporting crossbar is rotatably connected between the two hanging background curtain brackets, a curtain is fixed on the curtain supporting crossbar, and vegetation for measuring the lateral coverage is arranged between the camera height adjustment bracket and the hanging background curtain bracket. Beneficial effects: It can provide a reference for photos, facilitate the calculation of the projection length of plant height and branch length, and the extraction and calculation of coverage, and can quickly and accurately measure the lateral coverage of vegetation.

Description

Technical Field

[0001] The invention belongs to the technical field of vegetation ecological monitoring, and in particular relates to a device for measuring vegetation lateral coverage. Background Art

[0002] Cover is a key vegetation parameter and quantitative indicator that is often measured in ecology. It is of great significance for assessing vegetation health, productivity, windbreak and sand fixation, and soil and water conservation capabilities. However, most current vegetation surveys are still based on visual estimation, which requires a high level of experience from the investigators and is highly subjective and accidental. The difference in estimates between different investigators or even the same investigator at different times can be several times.

[0003] In order to solve the uncertainty and subjectivity in the measurement of vegetation cover, many researchers have proposed the use of photography or remote sensing technology to measure vegetation cover. Among them, the method of extracting by shooting with a digital camera is widely used because of its advantages such as high efficiency, accuracy and economy. For example, patent applicants have used digital camera photography to extract grassland and desert vegetation cover. The extraction methods are mainly supervised classification, RGB threshold segmentation method and classification decision tree method. However, the current extraction of vegetation cover based on digital photos is mainly based on vertical shooting, which can only obtain the vertical projection cover of vegetation, while the lateral cover is particularly important for the windbreak and sand fixation and soil and water conservation functions of vegetation and the calculation of sand transport. For example, the windbreak effect of Caragana or sand barriers planted in rows when it is perpendicular to the wind speed direction and when it is parallel to the wind speed direction is very different. In addition, vertical photography also has large errors in estimating vegetation height.

[0004] Therefore, a device for measuring the lateral coverage of vegetation is proposed to solve the shortcomings of the prior art. Summary of the invention

[0005] In order to solve the above technical problems, the present invention provides a device for measuring the lateral cover of vegetation, which can provide a reference for photos, facilitate the calculation of the projection length of plant height and branch length, and the extraction and calculation of cover, and can quickly and accurately measure the lateral cover of vegetation.

[0006] The technical solution of the present invention for solving the above-mentioned technical problems is as follows: The device for measuring the side cover of vegetation comprises: a camera bracket, a camera fixing cross bar, two camera height adjustment brackets, two hanging background curtain brackets, a curtain and a curtain supporting cross bar, the camera fixing cross bar is clamped between the two camera height adjustment brackets, the camera bracket is slidably arranged on the camera fixing cross bar, the two camera height adjustment brackets are provided with an adjustment mechanism for adjusting the camera fixing cross bar to a horizontal state, the curtain supporting cross bar is rotatably connected between the two hanging background curtain brackets, the curtain is fixed on the curtain supporting cross bar, and vegetation for measuring the side cover is arranged between the camera height adjustment bracket and the hanging background curtain bracket.

[0007] Beneficial effects: It can provide reference for photos, facilitate the calculation of the projection length of plant height and branch length, as well as the extraction and calculation of coverage, and can quickly and accurately determine the lateral coverage of vegetation.

[0008] Based on the above technical solution, the present invention can also be improved as follows.

[0009] Furthermore, the adjustment mechanism is a hose filled with water.

[0010] The beneficial effects of adopting the above further scheme are: simple structure, utilizing the connecting vessel principle, adjusting the height of the camera height adjustment bracket on both sides, and adjusting the camera fixing cross bar to be horizontal.

[0011] Furthermore, the hose is made of PVC.

[0012] The beneficial effects of adopting the above further solution are: light weight, good waterproofness and easy use.

[0013] Furthermore, a scale is provided on the camera fixing cross bar.

[0014] The beneficial effect of adopting the above further solution is: it is easy to determine the shooting position of the camera and improve the measurement accuracy.

[0015] Furthermore, the material of the curtain is spray-painted cloth material.

[0016] The beneficial effects of adopting the above further solution are: high reflection intensity and good projection effect.

[0017] Furthermore, the camera height adjustment bracket and the background curtain hanging bracket are both telescopic brackets.

[0018] The beneficial effect of adopting the above further solution is that it is easy to adjust the shooting height of the camera and keep the camera fixing crossbar horizontal.

[0019] Furthermore, the camera fixing cross bar is formed by splicing a plurality of supporting rods.

[0020] The beneficial effects of adopting the above further solution are: the length of the crossbar can be adjusted freely according to needs, it is easy to carry, and it is convenient to assemble and disassemble. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a structural schematic diagram of the present invention;

[0022] Figure 2 A schematic diagram for calculating the length (height) of plant branches in camera photos;

[0023] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0024] 1. Camera bracket; 2. Camera fixing bar; 3. Camera locking sleeve; 4. Camera height adjustment bracket; 5. Hose; 6. Hanging background curtain bracket; 7. Curtain locking sleeve; 8. Curtain; 9. Curtain supporting bar; 10. Vegetation; 11. Vegetation projection. DETAILED DESCRIPTION

[0025] The principles and features of the present invention are described below in conjunction with the accompanying drawings. The examples given are only used to explain the present invention and are not used to limit the scope of the present invention.

[0026] Example

[0027] like Figure 1 As shown, this embodiment provides a device for measuring the side coverage of vegetation, including: a camera bracket 1, a camera fixing crossbar 2, two camera height adjustment brackets 4, two hanging background curtain brackets 6, a curtain 8 and a curtain support crossbar 9, wherein the camera fixing crossbar 2 is clamped between the two camera height adjustment brackets 4, and a scale is provided on the camera fixing crossbar 2. Specifically, blocks are provided at both ends of the camera fixing crossbar 2, and the side edge of the camera height adjustment bracket 4 is provided with a card slot corresponding to the block in the vertical direction. The camera bracket 1 is slidably provided on the camera fixing crossbar 2, and the camera bracket 1 fixes the camera. The two camera height adjustment brackets 4 are provided with an adjustment mechanism for adjusting the camera fixing crossbar 2 to a horizontal state, and the adjustment mechanism is specifically a hose 5, and the hose 5 is filled with water, and the material of the hose 5 is PVC. The curtain support crossbar 9 is rotatably connected between the two hanging background curtain brackets 6, and the curtain 8 is fixed on the curtain support crossbar 9, and the material of the curtain 8 is a spray-painted cloth material. Vegetation 10 for measuring side coverage is arranged between the camera height adjustment bracket 4 and the hanging background curtain bracket 6 .

[0028] It should be noted that the camera height adjustment bracket 4 and the hanging background curtain bracket 6 are both telescopic brackets, specifically, the camera height adjustment bracket 4 is composed of a first set of rods and a second set of rods, the top of the first set of rods is fixedly provided with a camera locking sleeve 3, the second set of rods is sleeved in the camera locking sleeve 3, and the side walls of the second set of rods and the camera locking sleeve 3 are both provided with a plurality of locking holes at intervals, which are locked by locking screws; the hanging background curtain bracket 6 is composed of a third set of rods and a fourth set of rods, the top of the third set of rods is fixedly provided with a curtain locking sleeve 7, the fourth set of rods is sleeved in the curtain locking sleeve 7, and the side walls of the fourth set of rods and the curtain locking sleeve 7 are both provided with a plurality of locking holes at intervals, which are locked by locking screws.

[0029] Specifically, the camera fixing cross bar 2 is made of multiple support rods, and the length of the camera fixing cross bar 2 can be adjusted accordingly according to the area of ​​the vegetation 10. The specific support rods are made of aluminum alloy, each 1 meter long, and can be freely spliced ​​to the required length. There are rulers engraved every 10 centimeters on the rod.

[0030] Measurement method: Figure 2 As shown, first determine the main wind direction, the background curtain 8 is facing the main wind direction, first set the coordinates in the area to be tested, and use the drone to take the orthophoto. Before taking pictures, first fill the hose 5 with water, use the connecting vessel principle, adjust the height of the camera height adjustment bracket 4 on both sides, adjust the camera fixing crossbar 2 to horizontal, and try to keep the height of the camera fixing crossbar 2 at the center point of the vegetation 10 to reduce the offset of the photo; fix the digital camera on the camera bracket 1 and slide it horizontally and take pictures to ensure that the overlap rate of the two photos is greater than 75%. Use Photoshop to splice the photos and extract vegetation information, and use the length and width information of the plants in the photos to project them onto the background curtain 8 to form a vegetation projection 11, with h1 representing the actual length of the target plant in the photo; f represents the focal length of the lens; d1 represents the distance between the plant and the lens (which can be determined by drone aerial photography), and d2 represents the distance between the lens and the background curtain; H1 represents the height or length of the corresponding plant (or branch), and H2 represents the height of the background curtain. At this time, the side coverage is:

[0031] C=H1 / H2=(d1×h1) / (d2×h2).

[0032] The extraction of vegetation 10 can be automatically completed using software, and the VDVI (Vegetation DifferenceVegetation lndex) index can be used for extraction.

[0033] In the description of the present invention, it is necessary to understand that the terms "center", "length", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "inside", "outside", "peripheral", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention 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 invention.

[0034] In the description of the present invention, “plurality” means at least two, for example, two, three, etc., unless otherwise clearly and specifically defined.

[0035] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it 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.

[0036] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. 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. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. 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 the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0037] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A device for measuring the lateral coverage of vegetation, characterized in that: include: A camera bracket (1), a camera fixing cross bar (2), two camera height adjustment brackets (4), two hanging background curtain brackets (6), a curtain (8) and a curtain supporting cross bar (9); the camera fixing cross bar (2) is clamped between the two camera height adjustment brackets (4); the camera bracket (1) is slidably arranged on the camera fixing cross bar (2); the two camera height adjustment brackets (4) are provided with an adjustment mechanism for adjusting the camera fixing cross bar (2) to a horizontal state; the curtain supporting cross bar (9) is rotatably connected between the two hanging background curtain brackets (6); the curtain (8) is fixedly arranged on the curtain supporting cross bar (9); and vegetation (10) for measuring side coverage is arranged between the camera height adjustment bracket (4) and the hanging background curtain bracket (6); The adjustment mechanism is a hose (5), and the hose (5) is filled with water; The camera fixing cross bar (2) is provided with a scale.

2. The device for measuring the vegetation lateral coverage according to claim 1, characterized in that: The hose (5) is made of PVC.

3. The device for measuring the vegetation lateral coverage according to any one of claims 1 to 2, characterized in that: The material of the curtain (8) is a spray-painted cloth material.

4. The device for measuring the vegetation lateral coverage according to any one of claims 1 to 2, characterized in that: The camera height adjustment bracket (4) and the background curtain hanging bracket (6) are both telescopic brackets.

5. The device for measuring the vegetation lateral coverage according to any one of claims 1 to 2, characterized in that: The camera fixing cross bar (2) is formed by splicing a plurality of supporting rods.

Images