An updated GOCI algorithm for retrieving water-leaving radiance

DC Field Value Language
dc.contributor.author 안재현 -
dc.contributor.author 박영제 -
dc.contributor.author 김원국 -
dc.contributor.author 이보람 -
dc.date.accessioned 2020-07-15T20:34:22Z -
dc.date.available 2020-07-15T20:34:22Z -
dc.date.created 2020-02-11 -
dc.date.issued 2016-09-28 -
dc.identifier.uri https://sciwatch.kiost.ac.kr/handle/2020.kiost/24588 -
dc.description.abstract This study describes the updated atmospheric correction scheme that designed to retrieve the remote-sensing reflectance (Rrs) by the Geostationary Ocean Color Imager (GOCI) at the top-of-the-atmosphere (TOA). The algorithm update includes an absorption correction model of atmospheric gasses in red and near-infrared (NIR) bands and a new aerosol reflectance correction scheme that is methodologically more straightforward and accurate.We found water vapor absorption considerably effects on 660, 745, and 865 nm band of the GOCI for large zenith angles although the GOCI bands are designed to avoid its effect. The absorption correction model is developed and tested by using a radiative transfer simulation. After the correction of gaseous absorption, vicarious calibration gains has changed significantly that all gains are within the ranges of onboard calibration uncertainties, 3.8%.For the aerosol reflectance correction, we suggest a more direct and accurate aerosol correction scheme compared to previous methods. The method is based on the spectral relationships in the aerosol multiple-scattering reflectance between different wavelengths (called SRAMS) that directly determines the two most appropriate aerosol models and their mixing ratio with no residual errors in the NIR.We tested the updated algorithms regarding errors in the Rrs retrieval by in situ match-ups and the mean errors for bands from 412 to 555 nm were 1n absorption correction model of atmospheric gasses in red and near-infrared (NIR) bands and a new aerosol reflectance correction scheme that is methodologically more straightforward and accurate.We found water vapor absorption considerably effects on 660, 745, and 865 nm band of the GOCI for large zenith angles although the GOCI bands are designed to avoid its effect. The absorption correction model is developed and tested by using a radiative transfer simulation. After the correction of gaseous absorption, vicarious calibration gains has changed significantly that all gains are within the ranges of onboard calibration uncertainties, 3.8%.For the aerosol reflectance correction, we suggest a more direct and accurate aerosol correction scheme compared to previous methods. The method is based on the spectral relationships in the aerosol multiple-scattering reflectance between different wavelengths (called SRAMS) that directly determines the two most appropriate aerosol models and their mixing ratio with no residual errors in the NIR.We tested the updated algorithms regarding errors in the Rrs retrieval by in situ match-ups and the mean errors for bands from 412 to 555 nm were 1 -
dc.description.uri 1 -
dc.language English -
dc.publisher 해양위성센터/한국해양과학기술원 -
dc.relation.isPartOf International GOCI Symposium 2016 -
dc.title An updated GOCI algorithm for retrieving water-leaving radiance -
dc.type Conference -
dc.citation.conferencePlace KO -
dc.citation.endPage 44 -
dc.citation.startPage 44 -
dc.citation.title International GOCI Symposium 2016 -
dc.contributor.alternativeName 안재현 -
dc.contributor.alternativeName 박영제 -
dc.contributor.alternativeName 김원국 -
dc.contributor.alternativeName 이보람 -
dc.identifier.bibliographicCitation International GOCI Symposium 2016, pp.44 -
dc.description.journalClass 1 -
Appears in Collections:
Marine Digital Resources Department > Korea Ocean Satellite Center > 2. Conference Papers
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