同一铅垂面两次设站法树高测量及其精度分析

树高是评定立地质量和林木生长状况的重要依据,是林业调查的必测项目.该文提出了在复杂立地条件下,特别是在陡坡地带,水平距离难以测量的情况下,采用在同一垂面两次设站的方法对树高进行测量.说明了测量原理和测定过程,推导出了采用该方法计算树高的数学公式,并依据误差传播定律推导出误差模型,进行精度分析.在陡坡条件下选取符合条件的单木,以经纬仪和皮尺作为测量工具多次进行实验,并配以全站仪同步测量进行检核,通过对大量的实验数据进行分析比较,发现采用该方法测量的精度在1%以内,满足精度要求,而且测定方法简捷.

Surveying tree height by setting total station twice in one plumb side and its precision analysis.

Tree height is an important index of assessing site quality and growth status of trees.Submitted under the complicated site conditions,especially in steep slopes,the horizontal distance is difficult to measure.This paper tries to measure the tree height by setting the total station twice in one plumb side,describing the measurement principle and process,deducing the mathematical formula,proposing the error model according to the error propagation law,and making precision analyses.The authors selected one single standing tree on the steep slope to measure its height with a theodolite and ruler,combining with a total station to check the results.The analysis of experiment data shows that the measurement precision using this method is less than 1%,which could meet the request.In addition,this method is simple and direct.