Atmospheric correction of OLCI imagery over very turbid waters based on the RED/NIR/SWIR bands

The standard NASA atmospheric correction using near infrared bands (700 nm-900 nm) may work for clear to moderately turbid waters, but generally fails for extreme turbidities because of flattening of the water reflectance spectrum. The use of SWIR bands at 1.6 μm and/or 2.3 μm, such as the bands pre...

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Autores principales: Gossn, J.I., Ruddick, K.G., Dogliotti, A.I.
Formato: CONF
Materias:
atmospheric correction
OLCI
turbid waters
Infrared devices
Infrared radiation
NASA
Reflection
Absorption property
Atmospheric conditions
Atmospheric correction schemes
Atmospheric corrections
Near infrared band
Turbid water
Water reflectances
Water absorption
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_97898754_v2017-January_n_p1_Gossn
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Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id todo:paper_97898754_v2017-January_n_p1_Gossn
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spelling todo:paper_97898754_v2017-January_n_p1_Gossn2023-10-03T16:45:31Z Atmospheric correction of OLCI imagery over very turbid waters based on the RED/NIR/SWIR bands Gossn, J.I. Ruddick, K.G. Dogliotti, A.I. atmospheric correction OLCI turbid waters Infrared devices Infrared radiation NASA Reflection Absorption property Atmospheric conditions Atmospheric correction schemes Atmospheric corrections Near infrared band OLCI Turbid water Water reflectances Water absorption The standard NASA atmospheric correction using near infrared bands (700 nm-900 nm) may work for clear to moderately turbid waters, but generally fails for extreme turbidities because of flattening of the water reflectance spectrum. The use of SWIR bands at 1.6 μm and/or 2.3 μm, such as the bands present on MODIS, can be effective in extremely turbid waters, but may not be present, such as in the case of OLCI (Sentinel 3A), where a new SWIR band at 1016 nm is placed instead. This band may help to improve atmospheric correction in turbid waters at a lower marginal cost than longer SWIR bands. In this work, we endeavored to find 'atmospheric invariant' quantities using the RED/NIR/SWIR bands on OLCI to construct an atmospheric correction scheme over turbid waters. We found that if we choose certain spectrally-close band triplets (such as OLCI bands at 709-779-865 nm), the Rayleigh-corrected reflectance of the triplet's 'middle' band after baseline subtraction (or baseline residual, BLR) is essentially independent of the atmospheric conditions (including for very hazy scenes). In this work, we used three consecutive band triplets of the group of bands 620-709-779-865-1016 nm to construct the three corresponding BLRs and relate them to water reflectances at these wavelengths. To establish this relation, we used a simple water reflectance model for turbid scenarios where we varied backscattering and absorption properties according to previously reported values and the spectral behaviour of in-situ radiometric data from Río de la Plata (Argentina). We also tested the algorithm on a simulated dataset, obtaining good performances (almost 1:1 relation and R2 ≥ 97%) for scenarios without direct sunglint. © 2017 Comisión Permanente RPIC. CONF info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_97898754_v2017-January_n_p1_Gossn
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic atmospheric correction
OLCI
turbid waters
Infrared devices
Infrared radiation
NASA
Reflection
Absorption property
Atmospheric conditions
Atmospheric correction schemes
Atmospheric corrections
Near infrared band
OLCI
Turbid water
Water reflectances
Water absorption
spellingShingle atmospheric correction
OLCI
turbid waters
Infrared devices
Infrared radiation
NASA
Reflection
Absorption property
Atmospheric conditions
Atmospheric correction schemes
Atmospheric corrections
Near infrared band
OLCI
Turbid water
Water reflectances
Water absorption
Gossn, J.I.
Ruddick, K.G.
Dogliotti, A.I.
Atmospheric correction of OLCI imagery over very turbid waters based on the RED/NIR/SWIR bands
topic_facet atmospheric correction
OLCI
turbid waters
Infrared devices
Infrared radiation
NASA
Reflection
Absorption property
Atmospheric conditions
Atmospheric correction schemes
Atmospheric corrections
Near infrared band
OLCI
Turbid water
Water reflectances
Water absorption
description The standard NASA atmospheric correction using near infrared bands (700 nm-900 nm) may work for clear to moderately turbid waters, but generally fails for extreme turbidities because of flattening of the water reflectance spectrum. The use of SWIR bands at 1.6 μm and/or 2.3 μm, such as the bands present on MODIS, can be effective in extremely turbid waters, but may not be present, such as in the case of OLCI (Sentinel 3A), where a new SWIR band at 1016 nm is placed instead. This band may help to improve atmospheric correction in turbid waters at a lower marginal cost than longer SWIR bands. In this work, we endeavored to find 'atmospheric invariant' quantities using the RED/NIR/SWIR bands on OLCI to construct an atmospheric correction scheme over turbid waters. We found that if we choose certain spectrally-close band triplets (such as OLCI bands at 709-779-865 nm), the Rayleigh-corrected reflectance of the triplet's 'middle' band after baseline subtraction (or baseline residual, BLR) is essentially independent of the atmospheric conditions (including for very hazy scenes). In this work, we used three consecutive band triplets of the group of bands 620-709-779-865-1016 nm to construct the three corresponding BLRs and relate them to water reflectances at these wavelengths. To establish this relation, we used a simple water reflectance model for turbid scenarios where we varied backscattering and absorption properties according to previously reported values and the spectral behaviour of in-situ radiometric data from Río de la Plata (Argentina). We also tested the algorithm on a simulated dataset, obtaining good performances (almost 1:1 relation and R2 ≥ 97%) for scenarios without direct sunglint. © 2017 Comisión Permanente RPIC.
format CONF
author Gossn, J.I.
Ruddick, K.G.
Dogliotti, A.I.
author_facet Gossn, J.I.
Ruddick, K.G.
Dogliotti, A.I.
author_sort Gossn, J.I.
title Atmospheric correction of OLCI imagery over very turbid waters based on the RED/NIR/SWIR bands
title_short Atmospheric correction of OLCI imagery over very turbid waters based on the RED/NIR/SWIR bands
title_full Atmospheric correction of OLCI imagery over very turbid waters based on the RED/NIR/SWIR bands
title_fullStr Atmospheric correction of OLCI imagery over very turbid waters based on the RED/NIR/SWIR bands
title_full_unstemmed Atmospheric correction of OLCI imagery over very turbid waters based on the RED/NIR/SWIR bands
title_sort atmospheric correction of olci imagery over very turbid waters based on the red/nir/swir bands
url http://hdl.handle.net/20.500.12110/paper_97898754_v2017-January_n_p1_Gossn
work_keys_str_mv AT gossnji atmosphericcorrectionofolciimageryoververyturbidwatersbasedontherednirswirbands
AT ruddickkg atmosphericcorrectionofolciimageryoververyturbidwatersbasedontherednirswirbands
AT dogliottiai atmosphericcorrectionofolciimageryoververyturbidwatersbasedontherednirswirbands
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