Results 11 to 20 of about 228,699 (300)
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
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Enhanced Gap Fraction Extraction From Hemispherical Photography [PDF]
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. Here, we present an algorithm to classify hemispherical photography, whose aim is to reduce errors in ...
Gaston M. Diaz, Jose D. Lencinas
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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
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Gap and congruency effect in fraction comparison
, 2018 Natural number bias in fraction comparison has been studied examining the role of congruency effect. However, the congruency effect has been observed in opposite directions, suggesting that an explanation may lie in the strategies used by students. One of the strategies that may be used by students is gap thinking. We have carried out a cross-sectional
González-Forte, Juan Manuel +2 more
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Is There a Gap or Congruency Effect? A Cross-Sectional Study in Students’ Fraction Comparison [PDF]
Studia Psychologica, 2020 Many studies have addressed the natural number bias in fraction comparison, focusing on the role of congruency. However, the congruency effect has been observed to operate in the opposite direction, suggesting that a deeper explanation must underlie ...
Juan Manuel González-Forte +2 more
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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
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ASSESSMENT OF LIGHT ENVIRONMENT FOR HERBACEOUS VEGETATION IN SEMI-NATURAL GRASSLAND USING TIME-SERIES UAV DATA [PDF]
ISPRS Annals of the Photogrammetry, Remote Sensing and Spatial Information Sciences, 2023 Grasslands are important ecosystems containing unique biodiversity. It has been reported that some herbaceous species inhabiting grassland reduced its number and became extremely rare.
N. Miura, Y. Niwa, S. Yamada
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GAPS BETWEEN FRACTIONAL PARTS, AND ADDITIVE COMBINATORICS [PDF]
The Quarterly Journal of Mathematics, 2015 We give bounds on the number of distinct differences $N_a-a$ as $a$ varies over all elements of a given finite set $A$, and $N_a$ is a nearest neighbour to $a$.
Balog, Antal +2 more
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Direct Measurements of Fractional Quantum Hall Effect Gaps [PDF]
Physical Review Letters, 2007 We measure the chemical potential jump across the fractional gap in the low-temperature limit in the two-dimensional electron system of GaAs/AlGaAs single heterojunctions. In the fully spin-polarized regime, the gap for filling factor nu=1/3 increases LINEARLY with magnetic field and is coincident with that for nu=2/3, reflecting the electron-hole ...
Khrapai VS +7 more
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