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获取原始数据是森林资源清查中最重要的一环,森林计测仪器决定着数据的精度及获取数据的效率。为使我国森林计测仪器摆脱低智能、低精度阶段,电子测树仪应运而生,其具有精度高、功能多、价格低的特点。本文就电子测树仪用于单木测量的理论误差展开了讨论,经分析试验得出,电子测树仪测高功能理论精度高,理论相对误差小于0.3%;测径功能理论精度较低,当直径小于20 cm时,直径误差略大于0.3 cm,当直径大于20 cm时,直径误差小于1.5%;《国家森林资源连续清查技术规定》中规定的树高和胸径的最低精度不能满足电子测树仪材积测算的精度要求,材积的计算需要更高的精度。
Getting raw data is the most important part of forest resource inventory. Forest measurement instruments determine the accuracy of data and the efficiency of data acquisition. In order to get rid of the low intelligence and low precision stage of forest measuring instruments in our country, electronic tree-measuring instrument came into being, which has the characteristics of high precision, multi-function and low price. In this paper, the theoretical error of the electronic tree-logging instrument used for single-wood measurement is discussed. The analytical test shows that the precision of the electronic tree-measuring instrument is high, the theoretical relative error is less than 0.3% When the diameter is less than 20 cm, the diameter error is slightly larger than 0.3 cm. When the diameter is larger than 20 cm, the diameter error is less than 1.5%. The minimum precision of tree height and diameter at breast height specified in the Technical Specification for Continuous Inventory of National Forest Resources can not meet the requirements of electronic measurement Tree instrument volume calculation accuracy requirements, volume calculation requires higher accuracy.