Results 271 to 280 of about 4,971,302 (317)

Corn hyperspectra and their red edge characteristics

SPIE Proceedings, 2004
The hyperspectral reflectance of the canopy in field, the first and the third unfold leaves from the top of corn are measured indoor in different stages by a ASD FieldSpec Pro FR. The concentrations of chlorophyll and carotenoid of leaves corresponding to the spectra are determined by biochemical method.
Xiuzhen Wang, Jingfeng Huang, Yanlin Tang, Fumin Wang   +3 more
openaire   +1 more source

Assessment of red-edge vegetation indices for crop leaf area index estimation

Remote Sensing of Environment, 2019
This study explores the potential of vegetation indices (VIs) for crop leaf area index (LAI) estimation, with a focus on comparing red-edge reflectance based (RE-based) and the visible reflectance based (VIS-based) VIs.
T. Dong, Jiangui Liu, J. Shang, B. Qian, B. Ma, J. Kovacs, D. Walters, X. Jiao, X. Geng, Yichao Shi   +9 more
semanticscholar   +1 more source

Evaluating the potential of red edge position (REP) of hyperspectral remote sensing data for real time estimation of LAI & chlorophyll content of kinnow mandarin (Citrus reticulata) fruit orchards

Scientia Horticulturae, 2020
Leaf area index (LAI) and chlorophyll content (Chl) content are important indicators of plants health and nutrition status. Hyperspectral remote sensing is useful for the real-time estimation of plants biophysical and biochemical traits.
Ansar Ali, Muhammad Imran
semanticscholar   +1 more source

The red edge of plant leaf reflectance

International Journal of Remote Sensing, 1983
A detailed study of the red edge spectral feature of green vegetation based on laboratory reflectance spectrophotometry is presented. A parameter lambda is defined as the wavelength is defined as the wavelength of maximum slope and found to be dependent on chlorophyll concentration.
D. N. H. HORLER, M. DOCKRAY, J. BARBER
openaire   +1 more source

Helvellyn, Striding Edge and Red Tarn

1992
If the ice advanced across Britain today, it would demolish all traces of our civilization as easily as we sweep the garden path. Later on, as the ice melted, it would regurgitate a sad and unrecognisable jumble of fragments from everyday life. Today, in England and Wales there are no glaciers, but their power during the Ice Age is revealed by the ...
Andrew Goudie, Rita Gardner
openaire   +1 more source

Red-Edge Normalised Difference Vegetation Index (NDVI705) from Sentinel-2 imagery to assess post-fire regeneration

, 2020
Obtaining post-fire information from a burnt region is of paramount importance in applications such as examining the disturbance of natural ecosystems and in providing crucial information to local authorities that have control on policymaking. This study
C. Evangelides, A. Nobajas
semanticscholar   +1 more source

Red-edge-excitation fluorescence spectroscopy of indole and tryptophan

European Biophysics Journal, 1988
Studies on the dependence of indole and tryptophan fluorescence emission spectra on excitation wavelength, lambda ex, show that the emission shifts to longer wavelengths for red-edge excitation in different solid and viscous solvents. In solid systems the spectral shifts for excitation in the range from 290 to 310 nm can reach tens of nm, and they are ...
A P, Demchenko, A S, Ladokhin
openaire   +2 more sources

RED EDGE EXCITATION EFFECT IN INTACT EYE LENS

Photochemistry and Photobiology, 1989
Abstract—Shift in the wavelength of emission upon shift in the excitation wavelength towards the red edge of the absorption band is termed Red Edge Excitation Shift (REES). This effect is observed only in a situation where the fluorophore mobility with respect to the surrounding matrix is considerably reduced.
C M, Rao, S C, Rao, P B, Rao
openaire   +2 more sources

Sentinel-2 based prediction of spruce budworm defoliation using red-edge spectral vegetation indices

Remote Sensing Letters, 2020
This research compares the capabilities of various Sentinel-2-derived spectral vegetation indices (SVIs) in particular red-edge SVIs to detect and classify spruce budworm (Choristoneura fumiferana) (SBW) defoliation using Support Vector Machine (SVM) and
Rajeev Bhattarai, Parinaz Rahimzadeh-Bajgiran, A. Weiskittel, D. Maclean   +3 more
semanticscholar   +1 more source

Illusory Motion Induced by Blurred Red — Blue Edges

Perception, 2010
Visual patterns consisting of a red-and-blue region with a blurry edge yield illusory motion. Eye movements over a static pattern induced illusory motion of the edge in the direction opposite to the eye movement. The illusion also takes place for patterns in motion without eye movement.
Kohske, Takahashi, Ryosuke, Niimi, Katsumi, Watanabe   +2 more
openaire   +2 more sources