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A reinterpretation of the gap fraction of tree crowns from the perspectives of computer graphics and porous media theory. [PDF]
Front Plant Sci, 2023 The gap fraction (GF) of vegetative canopies is an important property related to the contained bulk of reproductive elements and woody facets within the tree crown volume.
Zhu Y +6 more
europepmc +2 more sources
Enhanced Gap Fraction Extraction From Hemispherical Photography
IEEE Geoscience and Remote Sensing Letters, 2015 Canopy structure can be estimated using gap fraction (GF) data, which can be directly measured with hemispherical photography. However, GF data accuracy is affected by sunlit canopy, multiple scattering, vignetting, blooming, and chromatic aberration ...
G. M. Díaz, J. D. Lencinas
semanticscholar +3 more sources
Estimation of Gap Fraction and Foliage Clumping in Forest Canopies
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 +2 more sources
EVALUATION OF FOREST CANOPY AND UNDERSTORY GAP FRACTION DERIVED FROM TERRESTRIAL LASER SCANNING [PDF]
The International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences, 2016 The quantification of forest carbon sequestration is helpful to understand the carbon storage on the Earth. The estimation of forest carbon sequestration can be achieved by the use of leaf area index (LAI), which is derived from forest gap fraction.
K. C. Chen, C. K. Wang
doaj +2 more sources
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\ud canopy directional gap fraction distribution in forest stands\ud in the Swiss National Park, eastern Switzerland. A scanner model\ud was derived to determine the expected number of laser shots in\ud all directions, and these data were compared with the measured\ud number of laser hits to ...
F. Danson +4 more
semanticscholar +4 more sources
Estimating Canopy Gap Fraction Using ICESat GLAS within Australian Forest Ecosystems
Remote Sensing, 2017 Spaceborne laser altimetry waveform estimates of canopy Gap Fraction (GF) vary with respect to discrete return airborne equivalents due to their greater sensitivity to reflectance differences between canopy and ground surfaces resulting from differences ...
Craig Mahoney +3 more
doaj +2 more sources
Retrieval of Gap Fraction and Effective Plant Area Index from Phase-Shift Terrestrial Laser Scans
Remote Sensing, 2014 The characterization of canopy structure is crucial for modeling eco-physiological processes. Two commonly used metrics for characterizing canopy structure are the gap fraction and the effective Plant Area Index (PAIe).
Pyare Pueschel +2 more
doaj +2 more sources
Geoplanning: Journal of Geomatics and Planning, 2018 Mangrove forest represented a coastal ecosystem in Indonesia. Theoretical validation and in-field measurement by calculating the number of trees and the density data that was validated through remote sensing would not be appropriate because the remote ...
Nurul Khakhim +2 more
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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 +2 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
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