Portable type tree diameter at breast height (DBH) measuring device and measuring method

Abstract

The invention discloses a portable type tree DBH measuring device and measuring method, solves the problems that in the prior art tree DBH measuring devices are large in size and inconvenient to carry and the diameters of the trees with large diameters are difficult to measure accurately and has the advantages that carrying is convenient and measuring is accurate. During measuring, a surface formed by a first clamp rod and a second clamp rod is perpendicular to the axis of the tree, the opening degrees of the first clamp rod and the second clamp rod are adjusted, so that both the first clamp rod and the second clamp rod are tangent with the tree, the position of a horizontal rod is adjusted so that the horizontal rod is tangent with the tree, and the tree diameter is calculated according to the geometrical relationship of the perimeter of a triangle formed by the first clamp rod, the second clamp rod and the horizontal rod, the opening degrees of the first clamp rod and the second clamp rod and the tree diameter.

Description

technical field [0001] The invention relates to a forest measuring device, in particular to a portable tree diameter measuring device and a measuring method. Background technique [0002] In the current inventory of forest resources and forestry investigation and research, tree diameter at breast height is an index of necessary investigation. The current measurement of tree diameter at breast height is mainly carried out manually with a DBH tape, which needs to wrap the tape around the trunk. For trees with thicker trunks, even two people are required to assist in the measurement, which is inconvenient to operate. Moreover, the unavoidable contact between human hands and the trunk during measurement is easy to be bitten by insects and ants. At the same time, manual reading of the scale is also prone to errors. Therefore, the accuracy and efficiency of traditional measurement methods are difficult to guarantee. [0003] Although there are already instruments for measuring t...

AI Technical Summary

Problems solved by technology

However, the angle between the two clamping rods of this measuring instrument is fixed at 60°, if the measuring angle is changed, the measurement of tree diameter cannot be realized

The diameter distribution range of the tree to be measured is relatively large. If the tree with a larger diameter at breast height is measured, the angle between the two clamping rods is fixed at 60°. When the two clamping rods are tangent to the tree, the clamping rod is required. It has a large length and is inconvenient to carry; and when measuring a tree with a small diameter, the length of the stick is relatively large, which is inconvenient to operate, and it is difficult for one person to complete the measurement, which affects the accuracy of the measurement

In addition, when using this device for measurement, it is necessary to ensure that the laser direction of the laser distance measuring probe is located on the bisector of the opening angle of the two clamping rods. If the laser direction deviates slightly, it will seriously affect the accuracy of detection. The precision requirements are strict, which greatly increases the manufacturing cost of the instrument

[0004]Other DBH measuring instruments are also relatively large, making it difficult to accurately measure the diameter of trees with large diameter distribution. At the same time, factors affecting the accuracy of tree diameter measurement Many, it is difficult to guarantee the accuracy of measurement

[0005] To sum up, in the prior art, the diameter measuring instruments of trees are large in size and inconvenient to carry, and it is difficult to accurately measure the diameter of trees with large diameter distribution problem, there is still no effective solution

Images