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提出了一种基于方格网法测算树冠体积的方法。研究利用免棱镜全站仪获取树冠点云数据,建立树冠表面特征点的坐标方格网,根据方格网法计算土方量的原理来求算树冠体积,通过传统经典模型人工方法、三维激光量测法与本文算法,分别计算实验区域研究对象的体积,将结果进行对比分析,本研究提出的算法平均相对误差为4.13%,平均准确度为95.97%,且在置信度0.05下树冠体积的计算值与实测值之间的差异性为不显著,结果完全满足计算精度,其计算耗时只有传统人工量测法的1/3,成本为三维激光扫描的2%,降低了成本且提高了效率。
A method of measuring crown volume based on grid method is proposed. The research uses the prismless total station to obtain the data of the crown point cloud, establishes the coordinate grid of the crown surface feature points, calculates the volume of the crown according to the principle of calculating the square earthwork by the grid method, through the classical classical model artificial method, Method and the algorithm in this paper, respectively, the volume of the study area were calculated and the results were compared. The average relative error of the proposed algorithm was 4.13%, the average accuracy was 95.97%, and the calculation of the crown volume under the confidence level of 0.05 The difference between the value and the measured value is insignificant, and the result fully satisfies the calculation precision, and the calculation time is only 1/3 of the traditional manual measurement, the cost is 2% of the 3D laser scanning, the cost is reduced, and the efficiency is improved .