Results 241 to 250 of about 1,205,740 (288)

Unmanned aerial vehicles (UAV)-based canopy height modeling under leaf-on and leaf-off conditions for determining tree height and crown diameter (case study: Hyrcanian mixed forest)

Canadian Journal of Forest Research, 2021
Tree height and crown diameter are two common individual tree attributes that can be estimated from unmanned aerial vehicle (UAV) images thanks to photogrammetry and structure from motion.
V. Nasiri, A. Darvishsefat, H. Arefi, M. Pierrot-Deseilligny, M. Namiranian, A. L. Bris   +5 more
semanticscholar   +1 more source

Modelling thermal eddy diffusivity at canopy height

Boundary-Layer Meteorology, 1977
A one-dimensional, steady-state plant-atmosphere model using different formulae for the thermal stability function is applied to data for corn crops. There are two general types of formulae available. Those proposed by W. C. Swinbank, A. J. Dyer and B. B. Hicks, and E. K.
L. A. Mehlenbacher, D. W. A. Whitfield
openaire   +1 more source

Digital Terrain, Surface, and Canopy Height Models From InSAR Backscatter-Height Histograms

IEEE Transactions on Geoscience and Remote Sensing, 2020
This article demonstrates how 3-D vegetation structure can be approximated by interferometric synthetic aperture radar (InSAR) backscatter-height histograms. Single-look backscatter measurements are plotted against the InSAR phase height and are aggregated spatially over a forest patch to form a 3-D histogram, referred to as InSAR backscatter-height ...
Gustavo H. X. Shiroma, Marco Lavalle
openaire   +1 more source

Remotely sensed canopy height reveals three pantropical ecosystem states

Ecology, 2016
AbstractAlthough canopy height has long been a focus of interest in ecology, it has remained difficult to study at large spatial scales. Recently, satellite‐borne LiDAR equipment produced the first systematic high resolution maps of vegetation height worldwide. Here we show that this new resource reveals three marked modes in tropical canopy height ~40,
Xu, Chi, Hantson, Stijn, Holmgren, Milena, Van Nes, Egbert H., Staal, Arie, Scheffer, Marten   +5 more
openaire   +3 more sources

Modeling forest canopy heights: The effects of canopy shape

Remote Sensing of Environment, 1997
Abstract Three-dimensional models that represent the top-of-canopy forest height structure were developed to simulate airborne laser profiling responses along forested transects. The simulator which produced these 3-D models constructed individual tree crowns according to a tree's total height, height to first branch, crown diameter, and crown shape (
openaire   +1 more source

Accuracy Assessment of ICESat-2 Ground Elevation and Canopy Height Estimates in Mangroves

IEEE Geoscience and Remote Sensing Letters, 2021
Rapid and accurate ecological surveys of mangroves are of great significance for coastal protection and global carbon balance assessments. Ice, Cloud, and Land Elevation Satellite-2 (ICESat-2)/Advanced Topographic Laser Altimeter System (ATLAS) data ...
Jianan Yu, S. Nie, Wenjie Liu, Xiaoxiao Zhu, Dajin Lu, Wenyin Wu, Yue Sun   +6 more
semanticscholar   +1 more source

Height and Biomass Inversion of Winter Wheat Based on Canopy Height Model

IGARSS 2018 - 2018 IEEE International Geoscience and Remote Sensing Symposium, 2018
The aboveground biomass of crops is an important index reflecting the growth status of crops. It is an important reference for achieving precise water and fertilizer management, yield monitoring and prediction. In this paper, the true height of the vegetation relative to the ground is obtained from the data preprocessing, the point cloud filtering and ...
Haikuan Fengabcd, Li Panabe, Fan Yan, Haojie Peiabg, Huifang Wang, Guijun Yang, Mingxing Liuabg, Zhichao Wuabg   +7 more
openaire   +1 more source

planet-canopy-height-CA

Canopy height estimation from PlanetScope time series with spatio-temporal deep ...
Dixon, Dan, Yufang Jin, Yunzhe Zhu
openaire   +1 more source

A backscattering data simulation model for forest canopy based on canopy height information

2018 IEEE Radar Conference (RadarConf18), 2018
The traditional backscattering data simulation models of forest canopy use uniform distribution or random distribution to simulate the vegetation distribution that are different from the real scene. To simulate the backscattering data of forest canopy realistically, a simulation method based on canopy height information is proposed.
Qiang Gao, Meng Ke, Zegang Ding, Tao Zeng   +3 more
openaire   +1 more source

A Multi-Scale Approach to Mapping Canopy Height

Photogrammetric Engineering & Remote Sensing, 2013
Abstract Mapping vegetation height over large areas presents a prob-lem of scale: height varies with the individual tree or stand, but the resolution of available datasets is too low to char-acterize this variability sufficiently for many applications.
Gordon M. Green, Sean C. Ahearn, Wenge Ni-Meister   +2 more
openaire   +1 more source