Results 1 to 10 of about 221,927 (260)
Estimation of Gap Fraction and Foliage Clumping in Forest Canopies [PDF]
Remote Sensing, 2018 The gap fractions of three mature hemi-boreal forest stands in Estonia were estimated using the LAI-2000 plant canopy analyzer ( LI-COR Biosciences, Lincoln, NE, USA) , the TRAC instrument (Miami, FL, USA), Cajanus’ tube, hemispherical photos, as well as
Andres Kuusk +3 more
doaj +4 more sources
Study on the canopy structure and light distribution of Hippophae rhamnoides at different ages [PDF]
Frontiers in Plant ScienceThe canopy structure of seabuckthorn has a profound effect on its light environment and ecological function with the dynamic evolution of stand age. To quantitatively analyze the driving mechanism of stand age and canopy structure on light distribution ...
Kaiwen Tan +10 more
doaj +2 more sources
Remote Sensing, 2020 This paper develops an algorithm to estimate vegetation canopy gap fraction (GF), taking advantage of the full Terrestrial Laser Scanner (TLS) resolution. After calculating the TLS angular resolution, the algorithm identifies the missing laser hits (gaps)
John Gajardo +4 more
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Forest Canopy Gap Fraction From Terrestrial Laser Scanning [PDF]
IEEE Geoscience and Remote Sensing Letters, 2007 A terrestrial laser scanner (TLS) was used to measure canopy directional gap fraction distribution in forest stands in the Swiss National Park, eastern Switzerland. A scanner model was derived to determine the expected number of laser shots in all directions, and these data were compared with the measured number of laser hits to determine directional ...
Felix Mörsdorf +2 more
exaly +4 more sources
A reinterpretation of the gap fraction of tree crowns from the perspectives of computer graphics and porous media theory [PDF]
Frontiers in Plant Science, 2023 Markus Eichhorn +2 more
exaly +2 more sources
Testing the Application of Terrestrial Laser Scanning to Measure Forest Canopy Gap Fraction
Remote Sensing, 2013 Terrestrial laser scanners (TLS) have the potential to revolutionise measurement of the three-dimensional structure of vegetation canopies for applications in ecology, hydrology and climate change.
F. Mark Danson +2 more
doaj +3 more sources
HortScience, 2022 In horticultural leafy vegetable production, continuously monitoring crop size indicators such as the leaf area index (LAI), leaf fresh weight (LFW), and leaf length (LL) is of practical value because these indicators are related to crop yields and ...
Koichi Nomura +8 more
doaj +1 more source
LiDAR Voxel-Size Optimization for Canopy Gap Estimation
Remote Sensing, 2022 Terrestrial laser scanning of forest structure is used increasingly in place of traditional technologies; however, deriving physical parameters from point clouds remains challenging because LiDAR returns do not have defined areas or volumes.
C. Wade Ross +5 more
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Sensitivity of LiDAR Parameters to Aboveground Biomass in Winter Spelt
Drones, 2023 Information about the current biomass state of crops is important to evaluate whether the growth conditions are adequate in terms of water and nutrient supply to determine if there is need to react to diseases and to predict the expected yield.
Carsten Montzka +4 more
doaj +1 more source
A field test of forest canopy structure measurements with the CanopyCapture smartphone application [PDF]
PeerJ, 2022 Background Several smartphone applications have been developed for the purpose of low-cost and convenient assessments of vegetation canopy structure and understorey illumination. Like standard hemispherical photography, most of these applications require
Christopher H. Lusk
doaj +2 more sources