Influencing Factors in Estimation of Leaf Angle Distribution of an Individual Tree from Terrestrial Laser Scanning Data
Abstract
:1. Introduction
2. Materials and Methods
2.1. Simulated Point Clouds Data
2.2. LAD Estimation
2.3. G-function Calculation
2.4. Validation
2.5. Sensitivity Analysis of the Influencing Factors
3. Results
3.1. The Point Density Effect on the LAD and G-Function Calculations Based on CPCs
3.2. The Effect of the Number of Scans and Scanner Height on the LAD and G-Function Calculations and the Occlusion Effect
4. Discussion
4.1. The Accuracy Assessment of LAD Estimation
4.2. Possible Sources of Error in LAD Estimation
4.3. Difference between the Effect of Number of Scans and Scanner Location on TLS-Based LAD and G-Function Estimation
4.4. Future Research Perspectives
5. Conclusions
Author Contributions
Funding
Informed Consent Statement
Acknowledgments
Conflicts of Interest
References
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Sensitivity Analysis | Comparisons | Data |
---|---|---|
Point density | Grid point distances (GPDs) of 2 mm, 5 mm, 1 cm, 2 cm, and 4 cm; they are equivalent to: a number of points per unit leaf area of 26.6 cm−2, 4.6 cm−2, 1.4 cm−2, 0.4 cm−2, and 0.2 cm−2 | Complete point clouds (CPC) |
Number of scans | One scan and the merged point clouds of two, four, and eight scans | Simulated TLS data |
Scanner height | 1.5 m, 3 m | Simulated TLS data |
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Jiang, H.; Hu, R.; Yan, G.; Cheng, S.; Li, F.; Qi, J.; Li, L.; **e, D.; Mu, X. Influencing Factors in Estimation of Leaf Angle Distribution of an Individual Tree from Terrestrial Laser Scanning Data. Remote Sens. 2021, 13, 1159. https://doi.org/10.3390/rs13061159
Jiang H, Hu R, Yan G, Cheng S, Li F, Qi J, Li L, **e D, Mu X. Influencing Factors in Estimation of Leaf Angle Distribution of an Individual Tree from Terrestrial Laser Scanning Data. Remote Sensing. 2021; 13(6):1159. https://doi.org/10.3390/rs13061159
Chicago/Turabian StyleJiang, Hailan, Ronghai Hu, Guangjian Yan, Shiyu Cheng, Fan Li, Jianbo Qi, Linyuan Li, Donghui **e, and **han Mu. 2021. "Influencing Factors in Estimation of Leaf Angle Distribution of an Individual Tree from Terrestrial Laser Scanning Data" Remote Sensing 13, no. 6: 1159. https://doi.org/10.3390/rs13061159