81 Hits in 5.8 sec

On the utilization of novel spectral laser scanning for three-dimensional classification of vegetation elements

Zhan Li, Michael Schaefer, Alan Strahler, Crystal Schaaf, David Jupp
2018 Interface Focus  
The authors would like to thank the members of the Terrestrial Lidar Scanning Research Coordination Network (http:// for their valuable discussions on TLS studies, and the reviewers that  ...  Science Foundation grants MRI-0923389 and DBI-1455636 and the National Aeronautics and Space Administration grant NNX14AQ18A. Acknowledgements.  ...  Some early studies tried the manual extraction of trunks against leaves from lidar scans [8] and finer discrimination of leaves from both trunks and branches through the manual comparison between leaf-on  ... 
doi:10.1098/rsfs.2017.0039 pmid:29503720 pmcid:PMC5829182 fatcat:4gasldtygrakpalrq2k7z2ivga

Terrestrial LiDAR: a three-dimensional revolution in how we look at trees

Mathias Disney
2018 New Phytologist  
Terrestrial laser scanning III. Turning points into trees IV. Current and future applications of TLS V.  ...  Conclusions Acknowledgements References SUMMARY: Terrestrial laser scanning (TLS) is providing new, very detailed three-dimensional (3D) measurements of forest canopy structure.  ...  Terrestrial laser scanning (TLS) Light detection and ranging (LiDAR) using laser wavelengths in the visible and near-infrared domain have been used for several decades (Lovell et al. 2003; Newnham et  ... 
doi:10.1111/nph.15517 pmid:30295928 fatcat:nq4ezhbrcrewngjyhqvewjg6w4

Estimating tree structural parameters via automatic tree segmentation from LiDAR point cloud data

Kenta Itakura, Satoshi Miyatani, Fumiki Hosoi
2021 IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing  
We appreciate Hong Tran and Hirofumi Matsuda for their help in labeling and providing suggestions for this work.  ...  Fumiaki Kitahara in Forestry and Forest Products Research Institute, which offered the test sample for our study. We thank Otake-gumi and Shoji-Gumi for providing the dataset for our work.  ...  Iida et al. (2016) separated leaf and branch points on the 3D point cloud data of two evergreen trees obtained using a dual-wavelength portable scanning LiDAR system by considering the reflection intensity  ... 
doi:10.1109/jstars.2021.3135491 fatcat:esrrnexop5gy3ieucfiddverja

Spectral and spatial information from a novel dual-wavelength full-waveform terrestrial laser scanner for forest ecology

F. Mark Danson, Fadal Sasse, Lucy A. Schofield
2018 Interface Focus  
Subsequently, two dual-wavelength instruments were developed independently, based on the heritage of Echidna, the dual-wavelength Echidna lidar (DWEL) [3] and the Salford Advanced Laser Canopy Analyser  ...  SALCA is a pulsed dual-wavelength instrument with co-aligned laser beams recording backscattered energy at 1063 and 1545 nm; it records full-waveform data by sampling the backscattered energy at 1 GHz  ...  Acknowledgements We would like to acknowledge Jon Murray from Lancaster University for arranging access to the Silverdale field site and for assistance with data collection, and the Forestry Commission  ... 
doi:10.1098/rsfs.2017.0049 pmid:29503727 fatcat:bda3gh5b3bh25jeu723ecvfwe4

Weighing trees with lasers: advances, challenges and opportunities

M. I. Disney, M. Boni Vicari, A. Burt, K. Calders, S. L. Lewis, P. Raumonen, P. Wilkes
2018 Interface Focus  
One contribution of 12 to a theme issue 'The terrestrial laser scanning revolution in forest ecology'.  ...  Various authors have proposed using dual-or multiwavelength lidar [71,76 -78] to exploit different material reflectance at different wavelengths.  ...  knowledge of how leaves and branches are co-located in 3D space.  ... 
doi:10.1098/rsfs.2017.0048 pmid:29503726 pmcid:PMC5829188 fatcat:pucz3npggbfdppk5ixolyvkbve

Investigating Bi-Temporal Hyperspectral Lidar Measurements from Declined Trees—Experiences from Laboratory Test

Samuli Junttila, Sanna Kaasalainen, Mikko Vastaranta, Teemu Hakala, Olli Nevalainen, Markus Holopainen
2015 Remote Sensing  
We conducted a test with spruce and pine trees using a hyperspectral Lidar instrument in a laboratory to determine the capability of combined range and reflectance measurements to investigate forest health  ...  Based on our results, hyperspectral Lidar has the potential to detect drought in spruce and pine trees.  ...  Terrestrial dual-wavelength Lidar systems, operating at 1064 nm and 1540 nm wavelengths, have been developed and tested in laboratory conditions [25, 26] .  ... 
doi:10.3390/rs71013863 fatcat:ibualkmd7jdtjju3ilzl2u2u3q

Radiometric Calibration of a Dual-Wavelength, Full-Waveform Terrestrial Lidar

Zhan Li, David Jupp, Alan Strahler, Crystal Schaaf, Glenn Howe, Kuravi Hewawasam, Ewan Douglas, Supriya Chakrabarti, Timothy Cook, Ian Paynter, Edward Saenz, Michael Schaefer
2016 Sensors  
Radiometric calibration of the Dual-Wavelength Echidna ® Lidar (DWEL), a full-waveform terrestrial laser scanner with two simultaneously-pulsing infrared lasers at 1064 nm and 1548 nm, provides accurate  ...  or wavelengths and advance the utilization of bi-and multi-spectral information added to 3D scans by novel spectral lidars.  ...  Echidna is a registered trademark of the Commonwealth Scientific and Industrial Research Organisation (CSIRO).  ... 
doi:10.3390/s16030313 pmid:26950126 pmcid:PMC4813888 fatcat:x32rcudvwrafhlko3dfgetxmcm

On seeing the wood from the leaves and the role of voxel size in determining leaf area distribution of forests with terrestrial LiDAR

Martin Béland, Dennis D. Baldocchi, Jean-Luc Widlowski, Richard A. Fournier, Michel M. Verstraete
2014 Agricultural and Forest Meteorology  
We analyzed LiDAR measurements from two field sites, located in Mali and in California, with trees having different leaf sizes during periods with and without leaves.  ...  ., a turbid medium with randomly positioned leaves.  ...  This highlights the inherent differences in observations of a canopy from above with an airborne LiDAR, from below with a terrestrial LiDAR in a tall canopy, and from the side with a terrestrial LiDAR  ... 
doi:10.1016/j.agrformet.2013.09.005 fatcat:secfcbhvwra6tat5mstlokpr6y

The potential to characterize ecological data with terrestrial laser scanning in Harvard Forest, MA

D. A. Orwig, P. Boucher, I. Paynter, E. Saenz, Z. Li, C. Schaaf
2018 Interface Focus  
At the 1548 nm wavelength, laser power returned from leaves is much lower than from woody materials, such as trunks and branches, due to absorption by liquid water in leaves.  ...  In contrast, returned power from both leaves and woody materials is similar at the other wavelength of 1064 nm [40] [41] [42] .  ... 
doi:10.1098/rsfs.2017.0044 pmid:29503723 pmcid:PMC5829185 fatcat:yrkrv73ejfbkndosom7s5wzfga

Uncertainty in Parameterizing Floodplain Forest Friction for Natural Flood Management, Using Remote Sensing

Alexander S. Antonarakis, David J. Milan
2020 Remote Sensing  
The lowest uncertainties resulted from terrestrial and airborne lidar, where airborne lidar is currently best at defining canopy leaf area, but more research is needed to determine wood area.  ...  Mean literature uncertainties in stem density, trunk diameter, wood, and leaf area indices (20, 10, 30, 20%, respectively) resulted in a combined Manning's n uncertainty from 11–13% to 11–17% at 2 m to  ...  Acknowledgments: The authors would like to thank Julian Leyland, Daniel Parsons, and Stuart Lane for discussions at the conception of this paper.  ... 
doi:10.3390/rs12111799 fatcat:z4rexszolvapbgndmielbrxcxq

A Density-Based Approach for Leaf Area Index Assessment in a Complex Forest Environment Using a Terrestrial Laser Scanner

Ali Rouzbeh Kargar, Richard MacKenzie, Gregory P. Asner, Jan van Aardt
2019 Remote Sensing  
We hypothesized that the intensity returned to the lidar system from woody materials, like branches, would be higher than from leaves, due to the liquid water absorption feature of the leaves and higher  ...  In recent years, Terrestrial Laser Scanning (TLS) has been recognized as a tool that addresses many of the limitations of manual and traditional forest data collection methods.  ...  [44] used the dual wavelength Echidna lidar (DWEL; [30] ), which collects data in two different wavelengths (1064 nm and 1548 nm), to measure the effective LAI.  ... 
doi:10.3390/rs11151791 fatcat:vjfer2lppjdtveq37yjha5k5gq


A. Elsherif, R. Gaulton, J. P. Mills
2020 ISPRS Annals of the Photogrammetry, Remote Sensing and Spatial Information Sciences  
Dual-wavelength Terrestrial Laser Scanning (TLS) has been successfully used in estimating canopy moisture content of individual trees in three dimensions (3D) in several recent studies.  ...  The results obtained in this study showed that dual-wavelength TLS has the potential to be used in operational landscape-scale EWT estimation, and can be a useful tool for the calibration and validation  ...  The research was funded by the Egyptian Ministry of Higher Education, represented by the Egyptian cultural and educational bureau in London, UK.  ... 
doi:10.5194/isprs-annals-v-3-2020-215-2020 fatcat:5mvjk2qpdrc4dfvmlpl7cwhlum

Terrestrial Laser Scanning for Plot-Scale Forest Measurement

Glenn J. Newnham, John D. Armston, Kim Calders, Mathias I. Disney, Jenny L. Lovell, Crystal B. Schaaf, Alan H. Strahler, F. Mark Danson
2015 Current Forestry Reports  
The use of Terrestrial Laser Scanning (TLS) for plot scale measurement was first demonstrated over a decade ago, with the intimation that these instruments could replace manual measurement methods.  ...  Through recent integration with airborne and satellite remote sensing, manual measurements of vegetation structure at the plot scale are now the basis for landscape, continental and international mapping  ...  Ongoing support for the development of TLS hardware and methods for forest measurement has been provided by the Australian Terrestrial Ecosystem Research Network (TERN).  ... 
doi:10.1007/s40725-015-0025-5 fatcat:ly2cxqludjgw5krkg6n52jy4oi

Wood-leaf classification of tree point cloud based on intensity and geometrical information [article]

Jingqian Sun, Pei Wang, Zhiyong Gao, Zichu Liu, Yaxin Li, Xiaozheng Gan
2021 arXiv   pre-print
Terrestrial laser scanning (TLS) can obtain tree point cloud with high precision and high density.  ...  The ranges of OA, Kappa and MCC of the proposed method are from 0.9167 to 0.9872, from 0.7276 to 0.9191, and from 0.7544 to 0.9211 respectively.  ...  Zhao et al. used the intensity information of the multi-wavelength fluorescence LiDAR (MWFL) system to obtain the separation of vegetation stems and leaves [33] .  ... 
arXiv:2108.01002v1 fatcat:wsa3vdrkgfharmopcjb5qncb44

Improving leaf area index (LAI) estimation by correcting for clumping and woody effects using terrestrial laser scanning

Xi Zhu, Andrew K. Skidmore, Tiejun Wang, Jing Liu, Roshanak Darvishzadeh, Yifang Shi, Joe Premier, Marco Heurich
2018 Agricultural and Forest Meteorology  
Terrestrial laser scanning (TLS) provides a 3-dimensional view of the forest canopy, which we used in this study to improve LAI estimation by directly retrieving leaf angle distribution, and subsequently  ...  Finally, the gap fraction derived from TLS was converted to effective LAI, and thence to LAI.  ...  In a recent paper, Li et al. (2018) showed value of dual-wavelength spectral scanning in separating foliar and woody components by combining geometric and radiometric attributes.  ... 
doi:10.1016/j.agrformet.2018.08.026 fatcat:ijqydhugkbgm5agrqfstzxocaq
« Previous Showing results 1 — 15 out of 81 results