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为适应现代森林调查的需要,根据测高、测径,测定距离的影像测树公式[AB=(u/cosα-F)/(F·cosα)·A′B′、D=(u/cosα-F)/F·A′B′和 u=(1.5F/A′B′+F)/cosα]以及测定每公顷胸高断面积总和光学角规的原理和方法,设计试制了 YCY—01型影像测树仪。测高一次测程可达32米,既可测立木的全高也可测商品材部份的高度;能够观测任意可见部位的直径;测定距离5—40米;测量坡度±50°;可观测每公顷胸高断面积。并可推算出立木形率、立木材积,单位面积蓄积、林木组成、林分平均直径和每公顷株数等。本文对影像测树的原理方法、有关技术问题、仪器构造和主要特点以及使用方法等都作了简要的说明。
In order to meet the needs of modern forest surveying, according to the image height measurement, diameter measurement, and distance measurement tree formula [AB = (u / cosα-F) / (F · cosα) · A’B ’, D = (u / cosα The principle and method for determining the sum of the angular magnitudes of heights and heights per hectare are designed and tested with the model YCY-01 Image tree measuring instrument. Height measuring a distance of up to 32 meters, can measure the full height of the standing tree can also measure the height of the merchandise material; to be able to observe any visible part of the diameter; measuring range of 5-40 meters; slope ± 50 °; observable chest height per hectare Broken area. And can calculate the rate of standing wood, standing timber volume, unit area accumulation, forest composition, average diameter of forest and the number of plants per hectare. In this paper, the principles and methods of image tree measurement, the related technical problems, the structure of the instrument, the main features and the methods of use are briefly described.