نتایج جستجو برای: canopy angle

تعداد نتایج: 144935  

1998
Gregory P. Asner

to nadir-viewed vegetation reflectance data. Variability INTRODUCTION in tissue optical properties was wavelength-dependent. During the past several decades, the tools for vegetation For green foliage, the lowest variation was in the visible remote sensing have evolved significantly. Optical remote (VIS) spectral region and the highest in the near-infrared sensing has expanded from the use of p...

2004
M. K. STEININGER M. K. Steininger

This paper reports on a test of the ability to estimate above-ground biomass of tropical secondary forest from canopy spectral re ectance using satellite optical data. Landsat Thematic Mapper data were acquired concurrent with Ž eld surveys conducted in secondary forest fallows nearManaus, Brazil and Santa Cruz de la Sierra, Bolivia. Measurements of age and above-ground live biomass were made ...

2014
Jun Luo Yong-Bao Pan Liping Xu Yuye Zhang Hua Zhang Rukai Chen Youxiong Que

During sugarcane growth, the Early Elongation stage is critical to cane yield formation. In this study, parameters of 17 sugarcane varieties were determined at the Early Elongation stage using CI-301 photosynthesis measuring system and CI-100 digital plant canopy imager. The data analysis showed highly significant differences in leaf area index (LAI), mean foliage inclination angle (MFIA), tran...

Journal: :علوم باغبانی ایران 0
اله داد سلیم پور دانشجوی سابق کارشناسی ارشد پردیس کشاورزی و منابع طبیعی دانشگاه تهران علی عبادی استاد پردیس کشاورزی و منابع طبیعی دانشگاه تهران محمدرضا فتاحی مقدم دانشیار پردیس کشاورزی و منابع طبیعی دانشگاه تهران محمدرضا بی همتا استاد پردیس کشاورزی و منابع طبیعی دانشگاه تهران

almond is among some of the most important nut crops requiring improvement in many aspects of its production. to do that, the first step is an evaluation of the genetic diversity of the existing germplasm. towards this end, 56 vigorous almond seedlings were evaluated with recording eight morphological characteristics (trunk diameter, height of main trunk, canopy density, canopy angle, branch nu...

2000
Nikolay V. Shabanov Y. Knyazikhin Frêdêric Baret Ranga B. Myneni

A stochastic radiative transfer equation for the mean l( → X), cosine of polar angle of direction → X d( → X2 → X0), Dirac delta function field and its solution for the case of discontinuous vegetation canopies is discussed in this article. The equation set v(→r ), indicator function Fdir(k), extraterrestrial solar radiance at the top of satisfies the law of energy conservation and is amenable ...

2004
D. Luquet M. Dingkuhn J. Dauzat

Most agronomic models estimate canopy light interception using the Beer-Lambert law. This method only accounts for leaf area index (LAI) and leaf angle distribution (LAD) without considering the crop’s structural heterogeneity in space, or soil-leaf or leaf-leaf radiative scattering. These factors have been extensively studied during the past ten years e.g; (Luquet et al. 1998; Nouvellon et al....

Journal: :Journal Of Geophysical Research: Biogeosciences 2021

In formulating canopy biophysical models of non-linear processes like photosynthesis and stomatal conductance, it is necessary to average inputs over some representative spatial scale (sub-leaf, leaf, sub-crown, crown, whole-canopy, etc.). The consequences the choice averaging often unclear due inability experiments robustly quantify fluxes across full range relevant length scales. This study q...

Journal: :Remote Sensing 2017
Vincent Markiet Rocío Hernández-Clemente Matti Mottus

The photochemical reflectance index (PRI) is a proxy for light use efficiency (LUE), and is used in remote sensing to measure plant stress and photosynthetic downregulation in plant canopies. It is known to depend on local light conditions within a canopy indicating non-photosynthetic quenching of incident radiation. Additionally, when measured from a distance, canopy PRI depends on shadow frac...

Journal: :Agriculture 2022

High-frequency imaging characteristics allow a geostationary satellite (GSS) to capture the diurnal variation in vegetation canopy reflectance spectra, which is of very important practical significance for monitoring via remote sensing (RS). However, observation angle and solar high-frequency GSS RS data usually differ, differences bidirectional from spectra are significant, makes it necessary ...

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