Estimating wheat biochemical concentration from field reflectance spectra

2003 ◽  
Author(s):  
Liangyun Liu ◽  
Bing Zhang ◽  
Lanfen Zheng ◽  
Qingxi Tong
Keyword(s):  
Reflectance Spectra ◽  
Field Reflectance

Über die Natur der Cu2+-Zentren im NH4Cl - die spektroskopische Untersuchung von Cu2+-dotiertem Hg(NH3)2Cl2/The Nature of the Cu2+ Centres in NH4Cl - a Spectroscopic Investigation of Cu2+ Doped Hg(NH3)2Cl2

1992 ◽  
Vol 47 (4) ◽  
pp. 465-469 ◽  
Author(s):  
G. Steffen ◽  
U. Kaschuba ◽  
M. A. Hitchman ◽  
D. Reinen
Keyword(s):  
Ground State ◽  
Spectroscopic Investigation ◽  
Reflectance Spectra ◽  
Ligand Field ◽  
Field Reflectance

The preparation of Hg(NH3)2Cl2 doped with a small amount of Cu2+ is reported. The EPR and ligand field reflectance spectra indicate the presence of “CuCl4(NH3)2” polyhedra with a compressed tetragonal geometry and confirm, that the centres in Cu2+ doped NH4Cl possess the same geometry - as postulated earlier. The Cu2+ centres in Hg(NH3)2Cl2 are less compressed than those in NH4Cl, however, as could be deduced from the copper(II) hyperfine values, which are strongly influenced by the quite different admixture of the metal 4s orbital into the Alg (dz2) ground state in the two cases, and from the comparable energies of the d - d transitions.

Tieftemperatur-Remissionsspektren oktaedrisch koordinierter Cu2+ -Ionen im Ligandenfeldbereich / Low temperature reflectance spectra of octahedrally coordinated Cu2+-ions in solids

1973 ◽  
Vol 28 (3-4) ◽  
pp. 464-471 ◽  
Author(s):  
J. Grefer ◽  
D. Reinen
Keyword(s):  
Reflectance Spectra ◽  
Ligand Field ◽  
Teller Distortion ◽  
Square Planar ◽  
Jahn Teller ◽  
Jahn Teller Effect ◽  
Field Formalism ◽  
Field Reflectance ◽  
Host Lattices ◽  
Overlap Model

AbstractThe ligand field reflectance spectra of octahedrally coordinated Cu2+-ions in different host lattices and at different temperature (300 °K - 4 °K) are critically compared. Especially the band shifts with decreasing temperature are analysed with respect to transitions from a dynamical to a static Jahn-Teller effect (macroscopic Jahn -Teller distortion of the lattice). In addition the square planar coordination of Cu2+ is discussed and alternative descriptions in the crystal field formalism and the angular overlap model are given.

Deriving chlorophyll fluorescence emissions of vegetation canopies from high resolution field reflectance spectra

2005 ◽  
Author(s):  
Elizabeth M. Middleton ◽  
Lawrence A. Corp ◽  
Craig S. Daughtry ◽  
Petya K. Entcheva Campbell ◽  
L. Maryn Butcher
Keyword(s):  
Chlorophyll Fluorescence ◽  
High Resolution ◽  
Reflectance Spectra ◽  
Vegetation Canopies ◽  
Field Reflectance

Validation airborne visible-infrared imaging spectrometer data at Ray Mine, Arizona

2000 ◽  
Vol 6 (3) ◽  
pp. 187-200 ◽  
Author(s):  
Harold R. Lang ◽  
Steven M. Baloga
Keyword(s):  
Infrared Imaging ◽  
Imaging Spectroscopy ◽  
Reflectance Spectra ◽  
Open Pit ◽  
Imaging Spectrometer ◽  
Diagnostic Statistics ◽  
Field Reflectance ◽  
Surface Mineralogy ◽  
Spectrometer Data ◽  
Comparable Quality

Abstract The fundamental promise of imaging spectroscopy is to provide surface mineralogy based on remotely-acquired, gridded reflectance spectra of comparable quality to those from high resolution laboratory and field spectrometers. For regulatory and environmental monitoring, validating imaging spectrometer data is a major issue with this emerging technology. In this paper we validate 1997 Airborne Visible-Infrared Imaging Spectrometer (AVIRIS) reflectance spectra covering 0.4 mu m-2.4 mu m at a stable, flat, manmade target at Ray Mine, Arizona, for EPA/NASA assessment of the utility of remote sensing for monitoring acid drainage from an active open pit copper mine. For validation, we a) compare qualitatively, laboratory and field reflectance spectra with corresponding AVIRIS spectra; b) compare quantitatively, mineralogically diagnostic statistics from field spectra with the same statistics from field spectra with the same statistics from AVIRIS spectra; and c) demonstrate a methodology for validating imaging spectrometer data for environmental applications.

Study of vegetation red edge indices of reflectance spectra for crops of winter wheat cultivated in the steppe zone of Ukraine

2012 ◽  
Vol 18 (4(77)) ◽  
pp. 45-51
Author(s):  
G.M. Zholobak ◽  
◽  
Z.M. Shportiuk ◽  
O.N. Sibirtseva ◽  
S.S. Dugin ◽  
...  
Keyword(s):  
Winter Wheat ◽  
Steppe Zone ◽  
Reflectance Spectra ◽  
Red Edge

Color Space Transformation using Neural Networks

2019 ◽  
Vol 2019 (1) ◽  
pp. 153-158
Author(s):  
Lindsay MacDonald
Keyword(s):  
Neural Network ◽  
Neural Networks ◽  
Color Space ◽  
Reflectance Spectra ◽  
Network Architectures ◽  
Color Spaces ◽  
Natural Materials ◽  
Space Transformation ◽  
Color Space Transformation

We investigated how well a multilayer neural network could implement the mapping between two trichromatic color spaces, specifically from camera R,G,B to tristimulus X,Y,Z. For training the network, a set of 800,000 synthetic reflectance spectra was generated. For testing the network, a set of 8,714 real reflectance spectra was collated from instrumental measurements on textiles, paints and natural materials. Various network architectures were tested, with both linear and sigmoidal activations. Results show that over 85% of all test samples had color errors of less than 1.0 ΔE2000 units, much more accurate than could be achieved by regression.

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