Results 21 to 30 of about 772 (153)
Standardizing the protocol for hemispherical photographs: accuracy assessment of binarization algorithms. [PDF]
PLoS ONE, 2014 Hemispherical photography is a well-established method to optically assess ecological parameters related to plant canopies; e.g. ground-level light regimes and the distribution of foliage within the crown space.
Jonas Glatthorn, Philip Beckschäfer
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Modelling and Comparing Shading Effects of 3D Tree Structures with Virtual Leaves
Remote Sensing, 2021 Reduced solar radiation brought about by trees on agricultural land can both positively and negatively affect crop growth. For a better understanding of this issue, we aim for an improved simulation of the shade cast by trees in agroforestry systems and ...
Rafael Bohn Reckziegel +4 more
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Comparison of mangrove canopy covering accuracy using landsat 8 and landsat 9 imagery based on several vegetation indices in West Bali National Park [PDF]
E3S Web of Conferences, 2023 The remote sensing implementation is beneficial as a means of monitoring the ecosystem. Landsat imagery is a remote sensing (open access) based data source with a long and wide monitoring period with good image quality.
As-syakur Abd. Rahman +7 more
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Model-based local thresholding for canopy hemispherical photography [PDF]
Canadian Journal of Forest Research, 2018 Canopy hemispherical photography (HP) is widely used to estimate forest structural variables. To achieve good results with HP, a classification algorithm is needed to produce binary images to accurately estimate the gap fraction. Our aim was to develop a local thresholding method for binarizing carefully acquired hemispherical photographs.
Díaz, Gastón Mauro +1 more
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Silva Fennica, 2001 During the 1996 growing season the seasonal dynamics of the Leaf Area Index (LAI) were determined by 3 different methods in two forest types: a mixed oak (Quercus robur L.) â beech (Fagus sylvatica L.) stand and an ash dominated (Fraxinus excelsior L.)
Mussche, Sylvie +5 more
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Thermal canopy photography in forestry - an alternative to optical cover photography
iForest - Biogeosciences and Forestry, 2015 Hemispherical canopy photography is a widely used technique to observe crown-related forest variables. However, standardization of this technique remains challenging, as exposure and threshold settings continue to constitute the main sources of variation
Nölke N, Beckschäfer P, Kleinn C
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Remote Sensing, 2023 Remote sensing technology is a timely and cost-efficient method for leaf area index (LAI) estimation, especially for less accessible areas such as mangrove forests.
Qiaosi Li +4 more
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Remote Sensing, 2018 Solar radiation is one of the most significant environmental factors that regulates the rate of photosynthesis, and consequently, growth. Light intensity in the forest can vary both spatially and temporally, so precise assessment of canopy and potential ...
Azadeh Abdollahnejad +3 more
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Optimizing forest canopy structure retrieval from smartphone-based hemispherical photography [PDF]
Methods in Ecology and Evolution, 2021 Abstract Hemispherical photography (HP) is a long-standing tool for forest canopy characterization. Currently, there are low-cost fisheye lenses to convert smartphones into highly portable HP equipment (smartphone-based HP, hereafter SHP).
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Estimating Effective Leaf Area Index of Winter Wheat Based on UAV Point Cloud Data
Drones, 2023 Leaf area index (LAI) is a widely used plant biophysical parameter required for modelling plant photosynthesis and crop yield estimation. UAV remote sensing plays an increasingly important role in providing the data source needed for LAI extraction. This
Jie Yang +7 more
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