Method for measuring diameter at breast height of standing tree in fixed point angular distance mode

Abstract

The invention relates to a method for measuring the diameter at the breast height of a standing tree in a fixed point angular distance mode. The diameter at the breast height is calculated through the method that the included angle between the left side and the right side of the diameter at the breast height of the measured standing tree, the slope distance between an instrument and the center of the diameter at the breast height and the dip angle of the instrument in the process of observation are observed through the instrument for measuring the angular distance. The method solves the problem occurring when a forest investigator measures the standing tree with a large diameter grade or the standing tree difficult to touch with the hands. Measured data can be automatically stored and recorded, the measurement efficiency of the forest investigator is greatly improved, the method is simple, and the shortages that when the diameter at the breast height is measured, measurement is difficult to conduct directly or the measurement accuracy is low, and the accuracy cannot meet the requirement are overcome.

Description

1. Technical field [0001] The invention relates to a method for measuring the diameter at breast height of a standing tree by using a fixed-point angular distance method, in particular to a technical method for measuring the diameter at breast height of a standing tree according to the angular distance based on a measuring instrument. 2. Technical background [0002] DBH is the abbreviation of diameter at breast height of standing trees, and it is one of the most basic factors for measuring standing trees. The method of using the DBH girth and the DBH caliper requires the measurement personnel to stand on the side of the measured standing tree, the measurement accuracy is low, and a large amount of measurement data needs to be recorded at the same time, the labor intensity is high, and for the standing tree with a large diameter class, The measurement is difficult. The traditional measurement method is to measure the breast diameter with a girth, a caliper, etc., and then re...

AI Technical Summary

Problems solved by technology

[0004] In order to overcome the disadvantages of low efficiency and poor operability of the traditional diameter measurement method in measuring the diameter of standing trees growing in bushes and large-diameter standing trees, improve efficiency, accuracy and operability, and realize accurate measurement of forest parameters, the present invention provides A method for measuring the diameter at breast height of a standing tree by collecting angular distances at fixed points with an instrument is provided, which is characterized in that: the left and right sides of the diameter at breast height of a standing tree are observed at point A at a suitable position, and the included angle β, The slant distance L between the instrument and the midpoint of the observed diameter at breast height, and the inclination angle ψ generated when the instrument observes the breast diameter, according to the geometric principle, through the trigonometric function formula Calculate r, and then get the standing tree diameter D according to the formula D=2r

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