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3 November 2010 Coastal ocean atmospheric correction for AVNIR-2 high resolution images
Hiroshi Murakami, Cécile Dupouy
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Proceedings Volume 7858, Remote Sensing of the Coastal Ocean, Land, and Atmosphere Environment; 785802 (2010) https://doi.org/10.1117/12.869512
Event: SPIE Asia-Pacific Remote Sensing, 2010, Incheon, Korea, Republic of
Abstract
Coastal ocean-color estimation needs to retrieve not only molecular and aerosol scattering (ρa), but also high spatial resolution sea-surface reflectance (ρa) because ρg has fine temporal and spatial scales due to variable winds and air-sea stability caused by the coastal geographical structure. Murakami and Frouin 2008 showed a possibility of ρg correction by using near infrared (NIR) and shortwave infrared (SWIR) channels of MODIS 500m observations. This study investigated the correction of the atmospheric and sea-surface reflectance on the southwest of New Caledonia lagoon using AVNIR-2 which has 10-m resolution but doesn't have SWIR. After corrections of gas absorption and molecule scattering, we estimated ρa+ρg and water-leaving reflectance iteratively through IOPs retrieved from visible bands. Spectral slope of ρa+ρg was assumed uniform within our small target area (60km×40km). We tested sensitivity to several possible IOP spectra (total absorption of particle and dissolved matter and back-scattering coefficients) with comparison to in-situ IOP measurements. The AVNIR-2 derived remote sensing reflectance agreed well to the MODIS one (rootmean square difference / average of Rrs 443nm was 43%), and AVNIR-2 IOPs agreed well to in-situ IOP measurements (correlation coefficients more than 0.9) when we used the IOP spectra modeled by in-situ measurements around the New Caledonia. Chlorophyll-a (Chla) calculated by the AVNIR-2 IOPs showed better agreement to in-situ Chla in the lagoon areas where traditional blue/green algorithms overestimated.
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Hiroshi Murakami and Cécile Dupouy "Coastal ocean atmospheric correction for AVNIR-2 high resolution images", Proc. SPIE 7858, Remote Sensing of the Coastal Ocean, Land, and Atmosphere Environment, 785802 (3 November 2010); https://doi.org/10.1117/12.869512
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KEYWORDS
Reflectivity
MODIS
Atmospheric corrections
Absorption
Aerosols
Spatial resolution
Near infrared
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