Spectral estimators of absorbed photosynthetically active radiation in corn canopies



Publisher: Laboratory for Applications of Remote Sensing, Purdue University, Publisher: For sale by the National Technical Information Service in West Lafayette, IN, [Springfield, Va

Written in English
Published: Downloads: 44
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Subjects:

  • Radioactive tracers in plant nutrition -- United States.,
  • Radioactive tracers in agriculture.,
  • Remote sensing -- United States.

Edition Notes

StatementK.P. Gallo, C.S.T. Daughtry, M.E. Bauer.
SeriesNASA CR -- 171822., LARS -- 062984., NASA contractor report -- NASA CR-171822., LARS technical report -- 062984.
ContributionsDaughtry, C. S. T., Bauer, Marvin E., Lyndon B. Johnson Space Center., Purdue University. Laboratory for Applications of Remote Sensing.
The Physical Object
FormatMicroform
Pagination1 v.
ID Numbers
Open LibraryOL17667280M

() Tan et al., Using hyperspectral vegetation indices to estimate the fraction of photosynthetically active radiation absorbed by corn canopies, International J. Remote Sens. doi: /, Spectral Estimators Of Absorbed Photosynthetically Active Radiation In Corn Canopies ( MB pdf file). 21 Pages. LARS Technical Note A revised version is in Remote Sens. Environ. (). Ranson, K. Jon, L.L. Biehl. Soybean Canopy Reflectance Modeling Data Set. . The objectives of this study were to describe the UV radiation environment with respect to the photosynthetically active radiation (PAR) environment at the base of a corn canopy and relate the differences in measured irradiances to differences in canopy characteristics and differences in the proportion of direct and diffuse radiation in the two.   The fraction of absorbed photosynthetically active radiation, fAPAR, is an important biophysical characteristic in models of gas exchange between the terrestrial boundary layer and the atmosphere, as well as in the analysis of vegetation productivity. Synoptic estimation of fAPAR has been performed by using NDVI as a linear proxy of fAPAR, despite the saturation of NDVI at fAPAR beyond .

The use of high spectral resolution bands for estimating absorbed photosynthetically active radiation (Apar). pp. 6th Int. Symp. on Physical Measurements and . Roy, J. and M. Methy. Absorption of photosynthetically active radiation by the leaves of grass species: inter- and intraspecific variations and phenotypic response to water stress. Oecologia Plantarum Ruhle, W. and A. Wild. The intensification of absorbance changes in leaves by light-dispersion. Planta Absorbed photosynthetically active radiation NDVI canopy spectral vegetation indices (VI), which are calculated based on linear relationship for corn (former) and for corn and soybean (latter) with significant decrease in sensitivity of NDVI to fAPAR exceeded T1 - Effects of standing litter on the biophysical interpretation of plant canopies with spectral indices. AU - Van Leeuwen, W. J.D. AU - Huete, A. R. PY - /1/1. Y1 - /1/1. N2 - Litter is frequently present within vegetation canopies and thus contributes to the overall spectral response of a by:

The Use of Narrow Spectral Bands for Improving Remote Sensing Estimation of Fractionally Absorbed Photosynthetically Active Radiation (fAPAR) College Park, Maryland: Department of Geography, University of Maryland 1 0 0 APAR - Absorbed Photosynthetically Active Radiation. Looking for abbreviations of APAR? It is Absorbed Photosynthetically Active Radiation. Absorbed Photosynthetically Active Radiation listed as APAR Spectral estimation of absorbed photosynthetically active radiation in corn canopies. Normalized Difference Vegetation Index (NDVI) • How NDVI Works • Live green plants absorb solar radiation in the photosynthetically active radiation (PAR) spectral region, which they use as a source of energy in the process of photosynthesis. • NDVI is calculated from the visible and near-infrared light reflected by vegetation. Leaf cellsFile Size: 2MB.   Reflectance above the canopy, spectral transmittance to the ground layer, and geometric and spectral measurements of canopy elements were made. Relatively large differentials occurred in spectral absorption by canopy layers, especially in the photosynthetically active region, as a function of solar zenith by:

Spectral estimators of absorbed photosynthetically active radiation in corn canopies Download PDF EPUB FB2

SPECTRAL ESTIMATORS OF ABSORBED PHOTOSYNTHETICALLY ACTIVE RADIATION IN CORN CANOPIES ABSTRACT Most models of crop growth and yield require an estimate of canopy leaf area index or absorption of radiation; however, direct measurement of LAlor light absorption can be tedious and time consuming.

TheCited by: Spectral estimation of absorbed photosynthetically active radiation in corn canopies Spectral Estimation of Absorbed Photosynthetically Active Radiation in Corn Canopies* K.

GALLO. DAUGHTRY, AND M. BAUER* Laboratory for Applications of Remote Sensing and Agronomy Department Purdue University, West Lafayette, Indiana Cited by: The object of this study was to develop relationships between photosynthetically active radiation (PAR) absorbed by corn (Zea mays L.) canopies and the spectral reflectance of the canopies.

Absorption of PAR was measured near solar noon in corn canopies planted in north-south rows at densities of 50, andplants ha. −1 Reflectance factor data were acquired with a radiometer with spectral bands Cited by: Get this from a library.

Spectral estimators of absorbed photosynthetically active radiation in corn canopies. [K P Gallo; C S T Daughtry; Marvin E Bauer; Lyndon B.

Johnson Spectral estimators of absorbed photosynthetically active radiation in corn canopies book Center.; Purdue University. Laboratory for Applications of Remote Sensing.].

Title: Spectral estimation of absorbed photosynthetically active radiation in corn canopies: Authors: Gallo, K. P.; Daughtry, C. T.; Bauer, M. Publication. Most models of crop growth and yield require an estimate of canopy leaf area index (LAI) or absorption of radiation.

Relationships between photosynthetically active radiation (PAR) absorbed by corn canopies and the spectral reflectance of the canopies were investigated. Reflectance factor data were acquired with a Landsat MSS band by: Most models of crop growth and yield require an estimate of canopy leaf area index (LAI) or absorption of radiation.

Relationships between photosynthetically active radiation (PAR) absorbed by corn canopies and the spectral reflectance of the canopies were investigated. Reflectance factor data were acquired with a Landsat MSS band radiometer.

The objective of this study was to develop relationships between photosynthetically active radiation (PAR) absorbed by corn (Zea mays L.) canopies and the spectral reflectance of the canopies. Absorption of PAR was measured near solar noon in corn canopies planted in a field experiment conducted at the Purdue University Agronomy Farm, West Lafayette, IN, on a Typic Argiaquol at densities of 50, andplants Cited by: The objective of this study was to develop relationships between photosynthetically active radiation (PAR) absorbed by corn (Zea mays L.) canopies and the spectral reflectance of the canopies.

Absorption of PAR was measured near solar noon in corn canopies planted in a field experiment conducted at the Purdue University Agronomy Farm, West. Canopy spectral measurements were made alongside quasi-simultaneous measurements of photo-synthetically active radiation (PAR) incident upon the growing corn canopies.

In order to highlight variations in corn growth due to biochemical composition changes, three different levels of nitrogen fertilization were implemented – non-nitrogen fertilization (N. Hyperspectral Estimation of Corn Fraction of Photosynthetically Active Radiation Article (PDF Available) in Agricultural Sciences in China 6(10) October with 56 Reads.

Introduction [2] The fraction of absorbed photosynthetically active radiation (FAPAR) has been recognized as one of the fundamental terrestrial state variables in the context of global change sciences [Steering Committee for GCOS, ].It is a key quantity in models assessing vegetation primary productivity and, more generally, in carbon cycle models implementing up‐to‐date land Cited by: Introduction.

The fraction of incoming solar radiation ( − nm spectral range) absorbed by green. vegetation canopies (Moreau and Li ; Ma et al. ) – known as the fraction of. [1] The fraction of absorbed photosynthetically active radiation, fAPAR, is an important biophysical characteristic in models of gas exchange between the terrestrial boundary layer and the atmosphere, as well as in the analysis of vegetation productivity.

Synoptic estimation of fAPAR has been performed by using NDVI as a linear proxy of fAPAR, despite the saturation of NDVI at fAPAR beyond Cited by: (). Using hyperspectral vegetation indices to estimate the fraction of photosynthetically active radiation absorbed by corn canopies.

International Journal. The Fraction of Absorbed Photosynthetically Active Radiation (FAPAR, sometimes also noted fAPAR or fPAR) is the fraction of the incoming solar radiation in the Photosynthetically Active Radiation spectral region that is absorbed by a photosynthetic organism, typically describing the light absorption across an integrated plant biophysical variable is directly related to the primary.

This may be attributable to the fact that the reflectance of the SWIR band were strongly controlled by leaf water content, which is a key component of corn photosynthesis and greatly affects the absorption of photosynthetically active radiation (APAR), and makes further impact on corn-canopy Cited by: 7.

Measurements of photosynthetically active radiation (PAR) in Inner Mongolia, China, from to were used to investigate its relationship with global solar radiation (G) under various sky y mean daily PAR generally increased from mol m −2 d −1 in December to mol m −2 d −1 in June with annual mean value being mol m −2 d − by: 9.

SPECTRAL ESTIMATORS OF ABSORBED PHOTOSYNTHETICALLY ACTIVE RADIATION IN CORN CANOPIES ABSTRACT Most models of crop growth and yield require an estimate of canopy leaf area index or absorption of radiation; however, direct measurement of LAI or light absorption can be tedious and time consuming.

The. Abstract: In recent years, the impact of chlorophyll content on the estimation of the fraction of absorbed photosynthetically active radiation (FPAR) has attracted increased attention.

In this study, chlorophyll-related vegetation indices (VIs) were selected and tested for their capability in crop FPAR estimation using simulated Sentinel-2 by: Most models of crop growth and yield require an estimate of canopy leaf area index (LAI) or absorption of radiation.

Relationships between photosynthetically. Although several types of satellite data provide temporal information of the land use at no cost, digital satellite data applications for agricultural studies are limited compared to applications for forest management.

This study assessed the suitability of vegetation indices derived from the TERRA-Moderate Resolution Imaging Spectroradiometer (MODIS) sensor and SPOT-VEGETATION (VGT) Cited by: Spectral estimation of absorbed photosynthetically active radiation in corn canopies. Cambridge English Corpus 에서 On bare soil 39% of both the dung-covered and buried seeds germinated, in perennial grass swards %, and under tree canopies 24% respectively.

The equation of Monsi and Saeki () has often been used in crop growth models to calculate the transmittance (τ) of radiation using a constant value of the extinction coefficient (k) throughout a growing season. However, there are some questions about the above usage.

One purpose of this study is to examine the applicability of the equation to crop growth other purpose of this. In this study, an in situ hyperspectral remote sensing approach was employed to estimate corn Chl content at the canopy level by using chlorophyll fluorescence (ChlF) signals in the O2–A absorption band.

Two new spectral indices, REArea (sum of first derivative reflectance between and nm) and REA (maximum of first derivative Author: Xuehong Zhang, Yang He, Chao Wang, Fan Xu, Xinhui Li, Changwei Tan, Dongmei Chen, Dongmei Chen, Guoj.

Spectral estimation of absorbed photosynthetically active radiation in corn canopies. From Cambridge English Corpus On bare soil 39% of both the dung-covered and buried seeds germinated, in perennial grass swards %, and under tree canopies   The overall objectives of this research are the identification and measurement of corn crop canopy variables which are related Purdue Agronomy Farm Corn Solar Radiation Intercepted (SRI) () Gallo, K.P., Daughtry, C.S.T., Bauer, M.E., (), "Spectral estimation of absorbed photosynthetically active radiation in corn canopies Author: Kevin P.

Gallo. DOI: /S(00) Corpus ID: Estimating Corn Leaf Chlorophyll Concentration from Leaf and Canopy Reflectance @inproceedings{DaughtryEstimatingCL, title={Estimating Corn Leaf Chlorophyll Concentration from Leaf and Canopy Reflectance}, author={Craig S. Daughtry and Charles L. Walthall and Moon Sun Kim and Eric C.

Brown de Colstoun and James. Spectral estimation of absorbed photosynthetically active radiation in corn canopies. Remote Sensing of Environment. Hatfield, J.L., Asrar, G., and Kanemasu, E.T. Intercepted photosynthetically active radiation estimated by spectral reflectance. The use of high spectral resolution bands for estimating absorbed photosynthetically active radiation (A par).

In 6 th Int. Symp. on Physical Measurements and Signatures in Remote Sensing. Introduction. Fraction of photosynthetically active radiation (FPAR) absorbed by crops, as the fraction of incoming solar radiation in the spectral range of – nm absorbed by crop canopies (Moreau and Li, ; Ma et al., ), was critical to understanding and quantifying the exchange of mass, energy and momentum between atmosphere and land surface, which played an important role in Cited by: 4.A spectral model was assembled and used to compute the potential solar irradiance in five broad bands, that is, ultraviolet-B ( - nm in wavelength), ultraviolet-A ( - nm), photosynthetically active ( - nm), near infrared ( - nm), and far infrared ( - nm), above a green vegetation canopy defined by ground albedo.Tan et al., Using hyperspectral vegetation indices to estimate the fraction of photosynthetically active radiation absorbed by corn canopies, International J.

Remote Sens. doi: /,