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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Glint Removal Assessment to Estimate the Remote Sensing Reflectance in Inland Waters with Widely Differing Optical Properties

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Author(s):
Bernardo, Nariane [1] ; Alcantara, Enner [2] ; Watanabe, Fernanda [1] ; Rodrigues, Thanan [3] ; Carmo, Alisson [1] ; Gomes, Ana [1] ; Andrade, Caroline [1]
Total Authors: 7
Affiliation:
[1] Sao Paulo State Univ UNESP, Dept Cartog, BR-19060600 Presidente Prudente, SP - Brazil
[2] Sao Paulo State Univ UNESP, Dept Environm Engn, BR-12245000 Sao Jose Dos Campos, SP - Brazil
[3] Fed Inst Educ Sci & Technol Para State IFPA, BR-68740970 Castanhal, PA - Brazil
Total Affiliations: 3
Document type: Journal article
Source: REMOTE SENSING; v. 10, n. 10 OCT 2018.
Web of Science Citations: 2
Abstract

The quality control of remote sensing reflectance (R-rs) is a challenging task in remote sensing applications, mainly in the retrieval of accurate in situ measurements carried out in optically complex aquatic systems. One of the main challenges is related to glint effect into the in situ measurements. Our study evaluates four different methods to reduce the glint effect from the R-rs spectra collected in cascade reservoirs with widely differing optical properties. The first (i) method adopts a constant coefficient for skylight correction () for any geometry viewing of in situ measurements and wind speed lower than 5 ms(-1); (ii) the second uses a look-up-table with variable values accordingly to viewing geometry acquisition and wind speed; (iii) the third method is based on hyperspectral optimization to produce a spectral glint correction, and (iv) computes as a function of wind speed. The glint effect corrected R-rs spectra were assessed using HydroLight simulations. The results showed that using the glint correction with spectral achieved the lowest errors, however, in a Colored Dissolved Organic Matter (CDOM) dominated environment with no remarkable chlorophyll-a concentrations, the best method was the second. Besides, the results with spectral glint correction reduced almost 30% of errors. (AU)

FAPESP's process: 15/21586-9 - Re-parametrization of a Quasi-Analytical Algorithm (QAA) to estimating the inherent optical properties in reservoirs of Tietê River
Grantee:Enner Herenio de Alcântara
Support Opportunities: Regular Research Grants
FAPESP's process: 12/19821-1 - Bio-optical model parametrization to study the chlorophyll-A concentration along a cascade of reservoirs
Grantee:Enner Herenio de Alcântara
Support Opportunities: Regular Research Grants