Comparison of stem volume estimates from terrestrial point clouds for mature Douglas-fir(Pseudotsuga menziessi(Mirb.)Franco)
作者机构：Forest EngineeringResourcesand Management DepartmentOregon State UniversityCorvallisOR 97333 ORUSA
出 版 物：《Information Processing in Agriculture》 (农业信息处理（英文）)
年 卷 期：2023年第10卷第3期
页 面：334-346页
核心收录：
学科分类：07[理学] 0701[理学-数学] 070101[理学-基础数学]
主 题：Lidar Cylinder models Cylinder segment length Taper equations Forest inventory and analysis
摘 要：As a complement to traditional estimates of stem dimensions from numerical models,terrestrial light detection and ranging(Lidar)provides direct stem diameter and volume values using cylindrical models constructed from point *** study used two approaches to estimate total stem volume using Lidar and compared them with two empirical equations,one used by the Forest Inventory Analysis in the Pacific Northwest(FIA-PNW)and one based on a taper *** fitted point clouds of 10 Douglas-fir with three sets of cylinder models that are distinguished by their segment length(i.e.0.5 m,1 m,and 2 m),then developed three taper equations based on the point-cloud-based diameter estimated *** estimated the total stem volume of the tree with eight models:six-point cloudbased(*** taper and three cylinders)and two ***,we used simulations to extrapolate the volume estimations of various methods for different diameters at breast height(DBH)*** found that all the point-cloud-based taper equations were similar in their performance(R2¼0:94,RMSE=4.6 cm)and produced mean volume estimates greater than mean estimates of the existing *** cylinder models produced 11–16%greater mean volume estimates than the FIA-PNW estimate,with the 0.5 m segment length producing the greatest values,followed by the 1 m and 2 m segment *** simulated data suggested that the mean volume estimates of a given DBH class are different when using different computation *** revealed a combined effect of the computation methods and the DBH class on the mean volume *** conclude that the point-cloud-based taper equations,after being symmetrically calibrated,would be consistent with the regional stem volume estimates,whereas the cylinder models would be better in estimating individual stem *** constructing Lidar-based cylinder models in future applications,cylinder segment length would need to be adjusted to the length and DBH of the stem
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