نتایج جستجو برای: vegetation canopy

تعداد نتایج: 59140  

2010
Yuhong He Amy Mui

Remote sensing imagery is being used intensively to estimate the biochemical content of vegetation (e.g., chlorophyll, nitrogen, and lignin) at the leaf level. As a result of our need for vegetation biochemical information and our increasing ability to obtain canopy spectral data, a few techniques have been explored to scale leaf-level biochemical content to the canopy level for forests and cro...

Journal: :Remote Sensing 2017
Jing Wang Zhengjun Liu Haiying Yu Fangfang Li

Large-scale coastal reclamation has caused significant changes in Spartina alterniflora (S. alterniflora) distribution in coastal regions of China. However, few studies have focused on estimation of the wetland vegetation biomass, especially of S. alterniflora, in coastal regions using LiDAR and hyperspectral data. In this study, the applicability of LiDAR and hypersectral data for estimating S...

The study of  vegetation dynamics under grazed and non-grazed rangelands is one of the most important prerequisites for range improvement. In this research, vegetation composition and the vegetation functional groups were compared in an exclosure site (livestock excluded for six years) and grazed area in semi-steppe rangelands in Tehran province. Systematic random sampling technique through the...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه تربیت مدرس - دانشکده منابع طبیعی و علوم دریایی 1388

this research was conducted in two protect and destroy region in the middle zagros, in illam province. in order to identification of ecological species group and evaluate density of regeneration, effect of many factors such as protection, vegetation, physiographic factors, physical and chemical properties of soil in study locations were studied. to achieve these purpose number of 54 plots using...

2007
J. Verrelst B. Koetz

Estimating forest variables, such as photosynthetic light use efficiency, from satellite reflectance data requires understanding the contribution of photosynthetic vegetation (PV) and nonphotosynthetic vegetation (NPV). The fractions of PV and NPV present in vegetation reflectance data are typically controlled by the canopy structure and the respective viewing angle. The persistent but highly v...

2009
M. Lorraine Tighe Heather McNairn

Vegetation canopy height is one of the fundamental structural parameters for estimating forest biomass and evaluating forest carbon balance. Remote sensing technologies like interferometric synthetic aperture radar (abbreviated as IFSAR or IFSAR) may provide a means to extract vegetation canopy heights remotely. A comparison of canopy height estimates derived from IFSAR scattering phase center ...

2013
Dominique Carrer Jean-Louis Roujean Sebastien Lafont Jean-Christophe Calvet

type : Poster Session : S1: Traits Submitted by : dominique carrer Authors and Speakers : Dominique Carrer Information about other authors : Dominique Carrer 1, Jean-Louis Roujean 1, Sebastien Lafont 1, and Jean-Christophe Calvet 1 1 Météo-France, CNRM/GAME, 42 avenue Gaspard Coriolis, 31057 Toulouse Cedex, France The carbon assimilation of vegetation depends on CO2 concentration, radiant solar...

Journal: :Remote Sensing 2016
Zhihui Wang Tiejun Wang Roshanak Darvishzadeh Andrew K. Skidmore Simon D. Jones Lola Suárez William Woodgate Uta Heiden Marco Heurich John W. Hearne

Hyperspectral remote sensing serves as an effective tool for estimating foliar nitrogen using a variety of techniques. Vegetation indices (VIs) are a simple means of retrieving foliar nitrogen. Despite their popularity, few studies have been conducted to examine the utility of VIs for mapping canopy foliar nitrogen in a mixed forest context. In this study, we assessed the performance of 32 vege...

2010
Kate A. Brauman David L. Freyberg Gretchen C. Daily

Vegetation can play a major role in the hydrologic ecosystem service tradeoffs resulting from land use change: by affecting the volume of rain water that reaches the ground surface, vegetation affects water supply. But because canopy interception of rainfall is affected in complex and competing ways by forest structure and ambient weather conditions, both of which vary at small and large scales...

2009
Pauline Stenberg Matti Mõttus Miina Rautiainen Janne Heiskanen

The concept of canopy spectral invariants states that simple algebraic combinations of leaf and canopy spectral transmittance and reflectance become wavelength independent and determine a small set of canopy structure specific variables. This set of structural variables specify the spectral response of a vegetation canopy to the incident solar radiation and allow for a simple and accurate param...

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