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Physics-informed deep generative learning for quantitative assessment of the retina. [PDF]
Nat CommunBrown EE +10 more
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Synergies and trade-offs in forest carbon pools: separating universal drivers from forest type-specific controls. [PDF]
Front Plant SciZhou Y, She J, Xiang G, Zhu X.
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Canadian Journal of Forest Research, 2000 This study presents the results of a comparison of digital and film hemispherical photography as means of characterizing forest light environments and canopy openness. We also compared hemispherical photography to spherical densiometry. Our results showed that differences in digital image quality due to the loss of resolution that occurred when images
Joseph J O'Brien, David B Clark
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2009 International Conference on Environmental Science and Information Application Technology, 2009 The values of leaf area index (LAI) were optically measured with digital hemispherical photography in deciduous Populus euphratica Oliv forests in the Tarim River Basin, China, and then they are estimated and analyzed. Circular fisheye photography was compared with another alternative indirect method (cover photography) for estimating LAI.
Cun Chang
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Comparison of film and digital hemispherical photography across a wide range of canopy densities
Agricultural and Forest Meteorology, 2002Hemispherical photography is a widely used method for assessing the light environment beneath forest canopies. As technology advances, digital photography is expected to increasingly replace conventional film photography for such work. However, in the absence of satisfactory comparisons between the two methods, caution is needed in the use of a digital
Sophie E Hale, Colin Edwards
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Agricultural and Forest Meteorology, 2013
Abstract Rapid, reliable and meaningful estimates of forest canopy are essential to the characterization of forest ecosystems. In this paper the accuracy of digital hemispherical (DHP) and cover (DCP) photography for the estimation of canopy properties in deciduous forests was evaluated.
Francesco Chianucci, Andrea Cutini
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Abstract Rapid, reliable and meaningful estimates of forest canopy are essential to the characterization of forest ecosystems. In this paper the accuracy of digital hemispherical (DHP) and cover (DCP) photography for the estimation of canopy properties in deciduous forests was evaluated.
Francesco Chianucci, Andrea Cutini
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Assessment of automatic gap fraction estimation of forests from digital hemispherical photography
Agricultural and Forest Meteorology, 2005Thresholding is a central part of the analysis of hemispherical images in terms of gap fraction and leaf area index (LAI), and the selection of optimal thresholds has remained a challenge over decades. The need for an objective, automatic, operatorindependent thresholding method has long been of interest to scientists using hemispherical photography ...
Inge Jonckheere, Bart Muys
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Agricultural and Forest Meteorology, 2014
Digital hemispherical photography (DHP) has been widely used to estimate the plant area index (PAI, a surrogate for leaf area index, LAI) for terrestrial vegetation. However, DHP has not been applied in aquatic environment fields for submerged vegetation, where only a few methods are available for LAI measurement.
Dehua Zhao, Penghe Wang, Shuqing An
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Digital hemispherical photography (DHP) has been widely used to estimate the plant area index (PAI, a surrogate for leaf area index, LAI) for terrestrial vegetation. However, DHP has not been applied in aquatic environment fields for submerged vegetation, where only a few methods are available for LAI measurement.
Dehua Zhao, Penghe Wang, Shuqing An
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Agricultural and Forest Meteorology, 2004
Digital hemispherical photography is an effective device for estimating the light environment beneath a forest canopy. In this study, the effects of different image quality, size and camera type on the light environment estimates using digital hemispherical photography were examined.
Akio Inoue +2 more
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Digital hemispherical photography is an effective device for estimating the light environment beneath a forest canopy. In this study, the effects of different image quality, size and camera type on the light environment estimates using digital hemispherical photography were examined.
Akio Inoue +2 more
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Forest Ecology and Management, 2015
Abstract Accurate estimation of seasonal leaf area index (LAI) variations is essential for predicting forest growth, but rapid and reliable methods for obtaining such estimates have rarely been reported. In this study, direct measurements of LAI seasonal variations in deciduous broadleaf forests in China were made through leaf seasonality ...
Zhili Liu, Chuankuan Wang, Jing M Chen
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Abstract Accurate estimation of seasonal leaf area index (LAI) variations is essential for predicting forest growth, but rapid and reliable methods for obtaining such estimates have rarely been reported. In this study, direct measurements of LAI seasonal variations in deciduous broadleaf forests in China were made through leaf seasonality ...
Zhili Liu, Chuankuan Wang, Jing M Chen
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