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Study of the anisotropic reflectance behavior of wheat canopy to evaluate the performance of radiative transfer model PROSAIL5B.

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Title Study of the anisotropic reflectance behavior of wheat canopy to evaluate the performance of radiative transfer model PROSAIL5B.
Not Available
 
Creator Chakraborty, D., Sehgal, V.K., Sahoo, R.N., Pradhan, S., Gupta, V.K.
 
Subject Bi-directional reflectance . Crop . Hotspot . Modeling . Inversion
 
Description Not Available
A field experiment was conducted on wheat to analyze
its bi-directional reflectance in relation to sun-target-sensor
geometry. To achieve a large variation in crop parameters, two
extreme nitrogen treatments were applied. The study reconfirms
the strong and consistent anisotropic patterns of wheat
bi-directional reflectance in visible (VIS) and near infra-red
(NIR) and its magnitude was highest in the principal plane.
This anisotropic pattern extended equally in shortwave infrared
(SWIR). The hotspot broadened with crop growth due to
increase in leaf area index (LAI), leaf size and planophilic
orientation. The shape and magnitude of PROSAIL5B simulated
spectra was in close agreement with the observed spectra
in the optical region for most of the view zenith and azimuth
angle combinations. In the NIR and SWIR, the magnitude of
the model simulations showed good match in the principal
plane, whereas underestimation was found in the backward
scattering direction at higher view zenith angles in the VIS.
The typical bowl shape of observed reflectance in principal
plane was very well simulated in NIR by the model but failed
in other wavebands. The model performed best in the NIR
region followed by SWIR and maximum relative error was in
VIS. Over the whole optical region and view zenith angles, the
model simulations showed an average error of 26%. The model
simulations were poor at low LAI indicating the need to
improve soil reflectance algorithm in the model. Results of
the study have implications for understanding the strengths/
shortcomings in the model and its inversion to derive crop
biophysical parameters from multispectral sensors.
Not Available
 
Date 2018-11-24T05:27:59Z
2018-11-24T05:27:59Z
2015-01-17
 
Type Research Paper
 
Identifier Chakraborty, D., Sehgal, V.K., Sahoo, R.N., Pradhan, S., Gupta, V.K. 2015. Study of the anisotropic reflectance behavior of wheat canopy to evaluate the performance of radiative transfer model PROSAIL5B. Journal of the Indian Society of Remote Sensing, 43(2): 297-310
0974-3006
http://krishi.icar.gov.in/jspui/handle/123456789/13023
 
Language English
 
Relation Not Available;
 
Publisher springer