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IJMS Vol.40(6) [December 2011] >


Title: Backscattering of light by coastal waters using hyperspectral in-situ measurements: A case study off Veraval, Gujarat, India
Authors: Sahay, Arvind
Chauhan, Prakash
Nagamani, P. V.
Sanwalani, Nivedita
Dwivedi, R. M.
Keywords: Inherent Optical Properties
Algorithm
Backscattering coefficient
Quasi analytical
Ocean colour
Issue Date: Dec-2011
Publisher: NISCAIR-CSIR, India
Abstract: Backscattering of coastal waters of Arabian Sea off Veraval, Gujarat, India has been reported using Quasi Analytical Algorithm (QAA) inversion method. The same is compared with the in-situ measurements. Present study compares the backscattering coefficient retrieved from QAA with the measured values of backscattering at 470 and 700 nm. Retrieved backscattering coefficient using QAA lies between 0.0005-0.0047 m-1 at 470 nm and 0.00006-0.0040 m-1 at 700 nm. This is compared with the measured backscattering coefficients. Root mean square error (RMSE) has been computed, taking logarithm (to base 10) of the measured and modeled values. RMSE for 470 nm is 0.21 and for 700 nm is 0.23. Mean percentage error has also been computed which is 19.19% at 470 nm and 43.90% at 700 nm. Field measurements show that the QAA approach overestimates the backscattering coefficient at 470 nm and 700 nm (19.19% and 43.90% respectively) in the coastal waters of Gujarat. This is possibly due to the wavelength model used in the computation of backscattering at various wavelengths.
Page(s): 762-769
CC License:  CC Attribution-Noncommercial-No Derivative Works 2.5 India
ISSN: 0975-1033 (Online); 0379-5136 (Print)
Source:IJMS Vol.40(6) [December 2011]

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