Method for measuring and computing forest stock volume parameter

A forest and parameter technology, applied in the field of measurement and calculation of forest accumulation parameters, can solve the problems of undiscovered data reporting and instrument market, and achieve the effects of convenient acquisition, low labor intensity and more information content

Inactive Publication Date: 2014-03-05
ZHEJIANG FORESTRY UNIVERSITY
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  • Method for measuring and computing forest stock volume parameter
  • Method for measuring and computing forest stock volume parameter
  • Method for measuring and computing forest stock volume parameter

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[0046] The present invention is described in further detail below in conjunction with examples and with reference to the accompanying drawings:

[0047] This method for measuring and calculating forest stock parameters is carried out as follows:

[0048] (1) Scan the forest stand with a laser ranging sensor: In the forest, install the panoramic scanner on a tripod at a height of 1.3 meters, adjust it to the level, and start a 360-degree surround scan to obtain the distance between all the surrounding trees and the scanner. distance, see Figure 4 , Figure 5 ;

[0049] (2) Obtain DBH: scan each tree one by one, see figure 1 ; Set O as the scanner position, C as the center point of the tree trunk, the scanner steps at a constant speed, and the angle ω between the two adjacent scanning points is equal, that is, ∠EOG=∠GOC 2 =∠C 2 OH=∠HOF=ω, ω is determined by the speed of the stepping motor and the scanning rate of the laser;

[0050] The right triangle EOC and COF formed b...

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Abstract

The invention discloses a method for measuring and computing a forest stock volume parameter, which belongs to a method for measuring forest land and computing a forest stock volume parameter by a panoramic-scanning laser distance measuring sensor. The method comprises the following seven steps: firstly, scanning forest stands by the laser distance measuring sensor; secondly, acquiring diameters at breast height; thirdly, computing the basal area per hectare of the diameters at breast height; fourthly, computing the average diameter at breast height; fifthly, computing the density of trunks; sixthly, computing vegetation cover rates at different heights; and seventhly, acquiring the coordinate pattern of forest tree distribution space. Since a non-contact mode is adopted for measuring and computing the forest stock volume parameter, the method is rapid, convenient and accurate, and is high in efficiency, low in labor intensity and capable of obtaining the vegetation cover rates at different heights in the vertical direction, which can not be provided by an existing method; the method can be used for estimating the forest stock volume and the forest biomass as being combined with aerial remote sensing and space remote sensing information.

Description

【Technical field】 [0001] The invention belongs to a method for measuring forest land and calculating forest accumulation parameters with a panoramic scanning laser ranging sensor. 【Background technique】 [0002] For the determination of forest accumulation parameters, although the well-known and public angle gauge measurement method is labor-intensive and inefficient, the angle gauge principle still maintains its technical advantages. Corner gauges have undergone many improvements over the past half century, but the fundamentals remain the same. [0003] For the estimation of regional forest stock and biomass, ground sampling or remote sensing combined with ground sampling are generally used. Remote sensing methods also require ground survey data in conjunction with modeling. There are two main methods of ground survey: sample plot survey and angle gauge survey. The former needs to measure each tree, which is labor-intensive and time-consuming. The latter is measured aro...

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Application Information

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IPC IPC(8): G01C11/00G01B11/08G01B11/28
CPCG01B11/08G01B11/28G01C3/10G01C15/002
Inventor 张茂震
Owner ZHEJIANG FORESTRY UNIVERSITY
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