Results 41 to 50 of about 778,318 (303)

Gradient Boosting Estimation of the Leaf Area Index of Apple Orchards in UAV Remote Sensing

Remote Sensing, 2021
The leaf area index (LAI) is a key parameter for describing the canopy structure of apple trees. This index is also employed in evaluating the amount of pesticide sprayed per unit volume of apple trees.
Zhijie Liu, Pengju Guo, Heng Liu, Pan Fan, Pengzong Zeng, Xiangyang Liu, Ce Feng, Wang Wang, Fuzeng Yang   +8 more
semanticscholar   +1 more source

Influence of canopy development in the vineyard on spray deposition from a tunnel sprayer

Journal of Agricultural Engineering, 2018
Spray deposition from a tunnel, air-assisted sprayer was analysed during the whole season, following canopy development in a vertical-shoot-positioned vineyard.
Gianfranco Pergher, Nicola Zucchiatti
doaj   +1 more source

Review of indirect optical measurements of leaf area index: Recent advances, challenges, and perspectives

Agricultural and Forest Meteorology, 2019
Leaf area index (LAI) is a key parameter of vegetation structure in the fields of agriculture, forestry, and ecology. Optical indirect methods based on the Beer-Lambert law are widely adopted in numerous fields given their high efficiency and feasibility
G. Yan, Ronghai Hu, Jinghui Luo, M. Weiss, Hailan Jiang, X. Mu, D. Xie, Wuming Zhang   +7 more
semanticscholar   +1 more source

Leaf area  Index measurements for  Pinus brutia  Ten. Plantations in Northern Iraqi [PDF]

Mesopotamia Journal of Agriculture
The surface area of the leaves of trees that perform photosynthesis is expressed by the leaf area index (LAI) for pine trees with different densities, using direct methods by collecting field data in 2022 from (30) samples, and measurements were taken of
Maan Shekho, Mohammed Al-Allaf, Muzahim Younis   +2 more
doaj   +1 more source

Leaf area index retrieval with ICESat-2 photon counting LiDAR

International Journal of Applied Earth Observations and Geoinformation, 2021
This is the first study to inverse leaf area index (LAI) with photon counting LiDAR (i.e., Ice, Cloud, and Land Elevation Satellite-2/Advanced Topographic Laser Altimeter System, ICESat-2/ATLAS). A new framework composed of three major steps was applied:
Jie Zhang, Jinyan Tian, Xiaojuan Li, Le Wang, Beibei Chen, Huili Gong, Rongguang Ni, Bingfeng Zhou, Cankun Yang   +8 more
doaj   +1 more source

A Simulation Study Using Terrestrial LiDAR Point Cloud Data to Quantify Spectral Variability of a Broad-Leaved Forest Canopy

Sensors, 2018
In this analysis, a method for construction of forest canopy three-dimensional (3D) models from terrestrial LiDAR was used for assessing the influence of structural changes on reflectance for an even-aged forest in Belgium.
Renato Cifuentes, Dimitry Van der Zande, Christian Salas-Eljatib, Jamshid Farifteh, Pol Coppin   +4 more
doaj   +1 more source

Estimating leaf area index and aboveground biomass of grazing pastures using Sentinel-1, Sentinel-2 and Landsat images

Isprs Journal of Photogrammetry and Remote Sensing, 2019
Grassland degradation has accelerated in recent decades in response to increased climate variability and human activity. Rangeland and grassland conditions directly affect forage quality, livestock production, and regional grassland resources.
Jie Wang, Xiangming Xiao, R. Bajgain, P. Starks, J. Steiner, R. Doughty, Q. Chang   +6 more
semanticscholar   +1 more source

Estimation of maize plant height and leaf area index dynamic using unmanned aerial vehicle with oblique and nadir photography.

Annals of Botany, 2020
BACKGROUND AND AIMS High throughput phenotyping is a limitation in plant genetics and breeding due to large-scale experiments in the field. Unmanned aerial vehicles (UAVs) can help to extract plant phenotypic traits rapidly and non-destructively with ...
Yingpu Che, Qing Wang, Ziwen Xie, Longyu Zhou, Shuangwei Li, Fang Hui, Xiqing Wang, B. Li, Yuntao Ma   +8 more
semanticscholar   +1 more source

Sentinel Image to Estimate Industrial Tomato Leaf Area Index

Brazilian Archives of Biology and Technology, 2023
The Leaf Area Index (LAI) is one of the main physiological parameters of the plant related to transpiration, productivity and rainfall interception. Among the methods to determine the LAI, the use of remote sensing that estimates the LAI through image ...
Mylena Marques Dorneles, Gustavo Henrique Mendes Brito, Ivandro José de Freitas Rocha, Sueli Martins de Freitas Alves   +3 more
doaj   +1 more source

Metsa lehepinnaindeksi kaardistamine lennukilidari, satelliidipiltide ja maapealsete mõõtmiste abil Järvselja VALERI testalal / Leaf area index mapping with airborne lidar, satellite images and ground measurements in Järvselja VALERI test site

Metsanduslikud Uurimused, 2011
The aim of this study was to compile the leaf area index (LAI) map of a 3×3 km VALERI test site in Järvselja, Estonia. Canopy transmittance measurements of LAI by LAI-2000 Plant Canopy Analyzers and digital cameras supplied with fisheye converters were ...
Kodar Ave, Lang Mait, Arumäe Tauri, Eenmäe Alo, Pisek Jan, Nilson Tiit   +5 more
doaj   +1 more source