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Estimation of the commercial height of trees with laser meter: a viable alternative for forest management in the Brazilian Amazon

机译：用激光仪估算树木的商业高度：巴西亚马逊森林管理的可行替代方案

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摘要

Commercial height of the tree is a key variable for estimating the wood stock in tropical forests managed for timber production purposes. Most available measurement devices suffer limitations in this type of forest, promoting low precision measurements with high variation errors. The laser meter device appears as a viable alternative, as in addition to using trigonometric principles, it is not necessary that the device is close to the eyes of the meter to carry out the measurement. The device can be used to measure commercial height of trees on flat or sloping terrain, at different distances from the tree. However, there are no studies evaluating the precision of this device. The objective of this study was to determine the precision of the laser meter method for estimating the commercial height of trees, as compared to the actual measurement in a tropical forest in the Brazilian Amazon. Measurements were made on 300 trees with commercial height between 7 and 14 m. Actual commercial heights were measured with graduated ruler. Applied tests were paired test, graphical analysis of residuals and calculations of bias statistics, mean absolute deviation, standard deviation of differences, and coefficient of determination ( ). Paired test indicated that the mean of the heights measured by the laser meter is statistically equal to that of the graduated ruler. Measurements with laser meter did not show bias and had mean error of 0.0745. The standard deviation of the differences indicated dispersion of errors of 0.97, equal to that shown in the graduated rule. Laser meter presents an alternative method for estimating the commercial height of trees in tropical forest in the Brazilian Amazon. There was no tendency to underestimate or overestimate the commercial heights of trees. Use of the laser meter is potentially of use for measuring the commercial height of trees in tropical forests.
机译：树木的商业高度是估算用于木材生产目的的热带森林中木材储量的关键变量。大多数可用的测量设备在这种类型的森林中都有局限性，从而导致精度低，测量误差高的测量。激光仪表设备似乎是可行的选择，因为除了使用三角测量原理外，该设备不必靠近仪表的眼睛即可进行测量。该设备可用于测量平坦或倾斜地形上树木与树木之间不同距离的商业高度。但是，尚无评估此设备精度的研究。这项研究的目的是确定与巴西亚马逊热带森林中的实际测量值相比，激光计方法估算树木商业高度的精度。在300棵商业高度在7至14 m之间的树木上进行了测量。实际的商业高度是用刻度尺测量的。应用的测试是配对测试，残差的图形分析和偏差统计的计算，平均绝对偏差，差异的标准偏差和确定系数（ ）。配对测试表明，激光计测得的高度平均值在统计学上等于刻度尺的平均值。激光计的测量结果没有偏差，平均误差为0.0745。差异的标准偏差表明误差的分散为0.97，等于刻度尺中所示的误差。激光计提供了另一种估算巴西亚马逊热带森林中树木商业高度的方法。没有低估或高估树木商业高度的趋势。激光计的使用潜在地可用于测量热带森林中树木的商业高度。

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