Prof. Yi Lin Profile

Prof. Yi Lin

at Peking Univ

SPIE Involvement:

Author

Publications (13)

SPIE Journal Paper | 9 July 2021

Individual tree detection and crown segmentation based on metabolic theory from airborne laser scanning data

Honglu Xin, Yadvinder Malhi, David A. Coomes, Yi Lin, Baoli Liu, Qiuli Yang, Alexander Shenkin

JARS, Vol. 15, Issue 03, 034504, (July 2021) https://doi.org/10.1117/12.10.1117/1.JRS.15.034504

KEYWORDS: Clouds, Algorithm development, Detection and tracking algorithms, Laser scanners, Airborne laser technology, Accuracy assessment, Image segmentation, Remote sensing, Algorithms, 3D scanning

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Laser scanning technology has enabled to study three-dimensional (3D) structures in forests. For example, airborne laser scanning (ALS) point cloud has been applied to detect individual trees and segment tree crowns. However, the accuracy of such approach remains a challenge because of the intersected crowns and complicated understories. We developed a metabolic theory-based algorithm for individual tree detection and crown segmentation from ALS data. The algorithm is composed of two parts, of which one is an unscaled transporting distance-based top-to-bottom detection approach, and the other is a scaled transporting distance-based segmentation approach. The unscaled transporting distance for detection is the absolute distance from tree root to crown and then to ALS point based on the tree structure models, whereas the scaled transporting distance for segmentation is the unscaled distance that is scaled by an initial tree height obtained during detection. This is based on a basic metabolic theory that vascular plants tend to minimize the material transporting distance from root to leaves. Hence, seven types of materials transporting distance models were built based on monopodial branching structure or crown-centered structure. The performance of the proposed approach was then further examined and compared with two typical canopy height model-based approaches and one typical point cloud-based approach, taking forest in Oxfordshire, UK, as a case study. The results showed that our approach can reach a recall of 1.00, a precision of 0.96, and an F-score of 0.98 and can reach to much higher accuracy for tree height (R2 = 0.8045) than the comparison approaches (R2 < 0.2) in the study plot. One of the main reasons that led to such low accuracy of comparison approaches is much overestimation of understory height with a mean error that is 2.9 times higher than that of our approach on average. Furthermore, ALS point-to-point level accuracy assessment shows 9.7% more ALS points were truly assigned in our approach than that of comparison approaches. It is noticed that the algorithm presented is not sensitive to the two key parameters: p (a percentage determining the threshold of unscaled transporting distances) ranging from 32.0% to 34.0% and λ (the proportion between the assumed crown center height and tree height) ranging from 0.70 to 0.90 based on our data set. Such high accuracy of our approach can greatly improve detections of individual tree and crown segmentation, especially in delineating understories in complex-structured forest.

Proceedings Article | 24 October 2018 Paper

From prototype system to practical application of hyperspectral LiDAR: Investigation of the intraday 3D variations of tree biophysics and biochemistry

Yi Lin, Miao Jiang

Proceedings Volume 10779, 107790U (2018) https://doi.org/10.1117/12.2324250

KEYWORDS: LIDAR, Biophysics, Biochemistry, Remote sensing, Nitrogen, Reflectivity

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Proceedings Article | 23 October 2018 Paper

Parameter comparison for linear spectral unmixing in field hyperspectral sampling of rocky desertification

Miao Jiang, Yi Lin

Proceedings Volume 10780, 1078018 (2018) https://doi.org/10.1117/12.2324391

KEYWORDS: Photovoltaics, Vegetation, Remote sensing, Digital photography, Reflectivity, Statistical analysis, Associative arrays, Solids, Carbonates, Analytical research

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SPIE Journal Paper | 14 March 2017

Toward extending terrestrial laser scanning applications in forestry: a case study of broad- and needle-leaf tree classification

Yi Lin, Miao Jiang

JARS, Vol. 11, Issue 01, 016037, (March 2017) https://doi.org/10.1117/12.10.1117/1.JRS.11.016037

KEYWORDS: Laser scanners, Forestry, Remote sensing, Laser applications, Clouds, Research management, Taxonomy, Document management, Light emitting diodes, Associative arrays

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SPIE Journal Paper | 27 May 2016

Airborne light detection and ranging laser return intensity-based investigation into crown-inside? A case study on Quercus robur trees

Yi Lin, Lifu Zhang, Cheng Wang

JARS, Vol. 10, Issue 02, 026024, (May 2016) https://doi.org/10.1117/12.10.1117/1.JRS.10.026024

KEYWORDS: LIDAR, Airborne laser technology, Laser optics, Clouds, Laser marking, Remote sensing, Data analysis, Associative arrays, Radiometric corrections, Laser scanners

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Proceedings Article | 9 December 2015 Paper

Monitoring abandoned dreg fields of high-speed railway construction with UAV remote sensing technology

Jiayuan Lin, Zhiliang Wang, Yangchun Wang, Yi Lin, Xiaolin Du

Proceedings Volume 9808, 980808 (2015) https://doi.org/10.1117/12.2207421

KEYWORDS: Unmanned aerial vehicles, Remote sensing, Data acquisition, Sensing systems, Control systems, Global Positioning System, Image resolution, Image quality, Image processing, Image segmentation

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Proceedings Article | 17 November 2014 Paper

Investigation of the shielding effect of tree structures measured by MLS on UV-B transmission

Haoran Zhou, Yi Lin, Huijing Zhao

Proceedings Volume 9262, 926211 (2014) https://doi.org/10.1117/12.2068681

KEYWORDS: Remote sensing, Laser scanners, LIDAR, Clouds, Ultraviolet radiation, Chromium, Neodymium, Distributed interactive simulations, Time metrology, Buildings

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Proceedings Article | 17 November 2014 Paper

Static terrestrial laser scanning of juvenile understory trees for field phenotyping

Huanhuan Wang, Yi Lin

Proceedings Volume 9262, 92620T (2014) https://doi.org/10.1117/12.2068661

KEYWORDS: 3D modeling, Laser scanners, Clouds, Principal component analysis, 3D acquisition, Remote sensing, 3D metrology, Three dimensional sensing, LIDAR, Geographic information systems

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Proceedings Article | 17 November 2014 Paper

Derivation of tree stem structural parameters from static terrestrial laser scanning data

Wei Tian, Yi Lin, Yajing Liu, Zheng Niu

Proceedings Volume 9262, 92620Z (2014) https://doi.org/10.1117/12.2068571

KEYWORDS: Clouds, Laser scanners, Remote sensing, Breast, Environmental management, Error analysis, LIDAR, 3D acquisition, 3D metrology, Data acquisition

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Proceedings Article | 17 November 2014 Paper

Attempt of UAV oblique images and MLS point clouds for 4D modelling of roadside pole-like objects

Yi Lin, Geoff West

Proceedings Volume 9262, 92620Q (2014) https://doi.org/10.1117/12.2068287

KEYWORDS: Unmanned aerial vehicles, Clouds, 3D modeling, Modeling, Remote sensing, Light sources and illumination, Imaging systems, UAV imaging systems, 3D image processing, Image segmentation

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Proceedings Article | 14 November 2007 Paper

Super-resolution image reconstruction methods applied to GFE-referenced navigation system

Lei Yan, Yi Lin, Qingxi Tong

Proceedings Volume 6790, 67902N (2007) https://doi.org/10.1117/12.750940

KEYWORDS: Reconstruction algorithms, Image restoration, Super resolution, Remote sensing, Navigation systems, Computer simulations, Image processing, Geographic information systems, Algorithms, Process modeling

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Proceedings Article | 10 November 2007 Paper

Research on positioning mode of LADAR aided navigation system over plain area

Yi Lin, Lei Yan, Qingxi Tong

Proceedings Volume 6795, 679539 (2007) https://doi.org/10.1117/12.774010

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Proceedings Article | 8 August 2007 Paper

Improving fundamental factors among correlation matching algorithms in underwater TANS

Yi Lin, Lei Yan, Qingxi Tong

Proceedings Volume 6752, 675216 (2007) https://doi.org/10.1117/12.760669

KEYWORDS: Reconstruction algorithms, Double sideband modulation, Algorithm development, Error analysis, Super resolution, Image restoration, Point spread functions, Navigation systems, Analytical research, Computer simulations

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Showing 5 of 13 publications

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