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在林业生产中围尺和轮尺都是常用的测径工具,但因围尺比轮尺轻巧,方便,所以现在多以围尺做为测量林木不同部位横断面直径(以下简称直径)的工具。实践证明:用围尺和轮尺同时测量树干某一部位的直径时,两者的结果往往不尽一致,存在着一定的偏差。这里所说的偏差是指:在测量对象相同的条件下,由于围尺和轮尺的构造与测量原理不同,而产生的观测值数量差。它并不包括工具本身的系统误差和操作中的测量误差。研究围尺测径偏差的目的,在于揭示出它的数量规律。众所周知:影响围尺测径偏差的
In forestry production, rulers and calipers are commonly used calipers, but because the ruler is lighter and more convenient than calipers, it is often used as a tool to measure the cross-sectional diameter of different parts of trees (hereinafter referred to as diameter) . Practice has proved that: with a ruler and calipers at the same time measuring the diameter of a part of the trunk, the results of the two are often not the same, there is a certain deviation. The deviation here refers to the difference in the number of observations due to the different construction and measurement principles of the girth and calipers under the same conditions of measurement. It does not include the systematic errors of the tool itself and the measurement errors in operation. The purpose of studying the deviation of radius measurement is to reveal its quantitative rules. As we all know: affect the circumference of the diameter measurement deviation