Results 11 to 20 of about 751 (246)
Comparison of terrestrial LiDAR and digital hemispherical photography for estimating leaf angle distribution in European broadleaf beech forests [PDF]
ISPRS Journal of Photogrammetry and Remote Sensing, 2019 Leaf inclination plays a crucial role in regulating the radiation, carbon and water fluxes in plant canopies. Accurate measurement of the probability density function of leaf inclination (i.e., the leaf angle distribution or leaf inclination distribution function (LIDF)), is very important for modelling photosynthesis as well as measuring leaf area ...
Jing Liu +2 more
exaly +4 more sources
Methods in Ecology and Evolution, 2023 Digital hemispherical photography (DHP) is widely used to derive forest biophysical variables including leaf, plant, and green area index (LAI, PAI and GAI), the fraction of intercepted photosynthetically active radiation (FIPAR), and the fraction of ...
Luke A. Brown +7 more
doaj +3 more sources
Hemispherical photography to estimate biophysical variables of cotton [PDF]
Revista Brasileira de Engenharia Agrícola e Ambiental, 2016 The Leaf Area Index (LAI) is a key parameter to evaluate the vegetation spectral response, estimating plant nutrition and water requirements. However, in large fields is difficult to obtain accurate data to LAI determination.
Ziany N. Brandão, João H. Zonta
doaj +3 more sources
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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International Journal of Remote Sensing, 2020 Unmanned aerial vehicles (UAVs) have the potential to provide highly detailed information on vegetation status useful in precision agriculture.
Luke A. Brown +2 more
openaire +4 more sources
Applied Sciences, 2022 The penetration of large-diameter tubular piles and their relevant construction effect have significant influences on the bearing capacity of piles and nearby buildings (structures).
Guojian Zhang +6 more
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Remote Sensing, 2020 Estimating leaf area index (LAI) and assessing spatial variation in LAI across a landscape is crucial to many ecological studies. Several direct and indirect methods of LAI estimation have been developed and compared; however, many of these methods are ...
Tamara E. Rudic +2 more
doaj +4 more sources
Reliability of canopy photography for forest ecology and biodiversity studies
Ecological IndicatorsUnderstory is a key component of forest biodiversity. The structure of the forest stand and the horizontal composition of the canopy play a major role on the light regime of the understory, which in turn affects the abundance and the diversity of the ...
Anouk von Meijenfeldt +5 more
doaj +2 more sources
Remote Sensing, 2017 In contrast to herbaceous canopies and forests, savannas are grassland ecosystems with sparsely distributed individual trees, so the canopy is spatially heterogeneous and open, whereas the woody cover in savannas, e.g., tree cover, adversely affects ...
Jucai Li +5 more
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Agricultural and Forest Meteorology, 2005 The retrieval of canopy architectural parameters using off-the-shelf digital cameras with fish-eye lens is investigated. The technique used takes advantage of the sensor’s linear response to light of these cameras to improve the estimation of gap fraction using:
Jing M Chen +2 more
exaly +3 more sources