| Autor: |
Cécile Dupouy, Hiroshi Murakami |
| Přispěvatelé: |
Frouin, R. (ed.), Yoo, H.R. (ed.), Won, J.S. (ed.), Feng, A. (ed.) |
| Rok vydání: |
2010 |
| Předmět: |
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| Zdroj: |
Remote Sensing of the Coastal Ocean, Land, and Atmosphere Environment. |
| ISSN: |
0277-786X |
| DOI: |
10.1117/12.869512 |
| Popis: |
Coastal ocean-color estimation needs to retrieve not only molecular and aerosol scattering ( ρ a ), but also high spatial resolution sea-surface reflectance ( ρ a ) because ρ g 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 ρ g 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 ρ a + ρ g and water-leaving reflectance iteratively through IOPs retrieved from visible bands. Spectral slope of ρ a + ρ g 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. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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