Assessing the stem taper function and volume estimation of poplar (Populus) by terrestrial laser scanning

doi:10.12302/j.issn.1000-2006.202006023

JOURNAL OF NANJING FORESTRY UNIVERSITY ›› 2021, Vol. 45 ›› Issue (4): 41-48.doi: 10.12302/j.issn.1000-2006.202006023

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Assessing the stem taper function and volume estimation of poplar (Populus) by terrestrial laser scanning

HUA Weicheng(), TIAN Jiarong, SUN Xinyu, XU Yannan^*()

Co-Innovation Center for the Sustainable Forestry in Southern China, College of Forestry, Nanjing Forestry University, Nanjing 210037, China

Received:2020-06-18 Accepted:2020-08-14 Online:2021-07-30 Published:2021-07-30
Contact: XU Yannan E-mail:xiaoxiaohuazang@163.com;nfuxyn@126.com

Abstract

Abstract:

【Objective】The taper function can describe variations in the trunk diameter and tree height, and it is important to estimate standing tree volume using an accurate taper function based on the high-precision three-dimensional point cloud data of the terrestrial laser scanner (TLS). 【Method】 A poplar (Populus) artificial forest in Huanghai Haibin National Forest Park, Jiangsu Province, was examined, and TLS was used to obtain point cloud data from four sampling plots. The single tree trunk point cloud was extracted by calculating flatness and a normal vector using MATLAB 2020a software. The circular fitting method was used to fit diameters at different heights. Using data of 32 sample trees, six types of taper functions were selected for modeling. The poplar tree volume was estimated using an optimized taper function. 【Result】The DBH(diameter at breast height) produced from TLS data corresponds to the measured DBH values, with an average error of less than 0.90 cm. According to the goodness of fit test of six models, a Schumacher and Hall model was the optimal taper function for poplars in this region, with an R² value of 0.984, RMSE is 1.00 cm, MAPE is 2.79%, and MPE is 0.271%. Volumes of standing trees were estimated using the optimal taper function. Compared with the estimation results of the binary volume equation, the relative difference was 3.34%, and there was no significant difference between them. 【Conclusion】This method may help reduce ground surveys and provide an effective technical support for artificial forest volume investigations.

Key words: poplar (Populus spp.), terrestrial laser scanner (TLS), taper function, tree volume, trunk detection, point cloud data

CLC Number:

S758

HUA Weicheng, TIAN Jiarong, SUN Xinyu, XU Yannan. Assessing the stem taper function and volume estimation of poplar (Populus) by terrestrial laser scanning[J]. JOURNAL OF NANJING FORESTRY UNIVERSITY, 2021, 45(4): 41-48.

Figures/Tables 6

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Table 1

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Table 2

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样地编号 plot No.	株数 tree numbers	林龄/ a stand age	树高/m tree height	胸径/ cm DBH	枝下高/m under- branch height	点云密度/ (点·m^-2) point density
1	10	9	25.7±5.64	24.36±4.38	3.9±1.6	22 888
2	14	12	27.4±0.87	27.69±5.16	6.2±1.4	14 556
3	10	12	26.3±0.95	27.27±3.15	5.7±1.7	21 634
4	9	15	33.1±0.89	45.32±5.27	8.2±0.9	8 475

模型 model	文献 reference	系数个数 number of parameter	R²			σ(RMSE)/cm			σ(MAPE)/%			σ(MPE)/%
模型 model	文献 reference	系数个数 number of parameter	n=26	n=6	n=32	n=26	n=6	n=32	n=26	n=6	n=32	n=26	n=6	n=32
Munro	[20]	2	0.844	0.926	0.887	2.65	2.66	2.68	8.41	6.32	8.13	0.834	1.395	0.725
Kozak	[21]	3	0.979	0.988	0.984	0.97	1.08	1.00	2.81	2.15	2.73	0.307	0.567	0.269
Schumacher and Hall	[22]	4	0.979	0.988	0.984	0.98	1.05	1.00	2.83	2.11	2.79	0.309	0.557	0.271
Ormerod	[23]	1	0.979	0.987	0.984	0.98	1.14	1.01	2.82	2.19	2.73	0.310	0.594	0.284
曾伟生	[24]	4	0.980	0.989	0.985	0.96	1.04	0.97	2.68	2.16	2.57	0.302	0.548	0.262
严若海	[25]	8	0.857	0.732	0.854	2.54	5.06	3.05	7.84	9.08	9.16	0.805	2.721	0.828

Assessing the stem taper function and volume estimation of poplar (Populus) by terrestrial laser scanning

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