Vicarious calibration of the Geostationary Ocean Color Imager SCIE SCOPUS

Cited 20 time in WEB OF SCIENCE Cited 20 time in Scopus
Title
Vicarious calibration of the Geostationary Ocean Color Imager
Author(s)
Ahn, Jae-Hyun; Park, Young-Je; Kim, Wonkook; Lee, Boram; Oh, Im Sang
KIOST Author(s)
Ahn, Jae Hyun(안재현)Park, Young Je(박영제)
Publication Year
2015-09-07
Abstract
Measurements of ocean color from Geostationary Ocean Color Imager (GOCI) with a moderate spatial resolution and a high temporal frequency demonstrate high value for a number of oceanographic applications. This study aims to propose and evaluate the calibration of GOCI as needed to achieve the level of radiometric accuracy desired for ocean color studies. Previous studies reported that the GOCI retrievals of normalized water-leaving radiances (nL(w)) are biased high for all visible bands due to the lack of vicarious calibration. The vicarious calibration approach described here relies on the assumed constant aerosol characteristics over the open-ocean sites to accurately estimate atmospheric radiances for the two near-infrared (NIR) bands. The vicarious calibration of visible bands is performed using in situ nL(w) measurements and the satellite-estimated atmospheric radiance using two NIR bands over the case-1 waters. Prior to this analysis, the in situ nL(w) spectra in the NIR are corrected by the spectrum optimization technique based on the NIR similarity spectrum assumption. The vicarious calibration gain factors derived for all GOCI bands (except 865nm) significantly improve agreement in retrieved remote-sensing reflectance (R-rs) relative to in situ measurements. These gain factors are independent of angular geometry and possible temporal variability. To further increase the confidence in the calibration gain factors, a large data set from shipboard measurements and AERONET-OC is used in the validation process. It is shown that the absolute percentage difference of the atmospheric correction results from the vicariously calibrated GOCI system is reduced by similar to 6.8%. (C) 2015 Optical Society of America
ISSN
1094-4087
URI
https://sciwatch.kiost.ac.kr/handle/2020.kiost/2409
DOI
10.1364/OE.23.023236
Bibliographic Citation
OPTICS EXPRESS, v.23, no.18, pp.23236 - 23258, 2015
Publisher
OPTICAL SOC AMER
Subject
WATER-LEAVING RADIANCE; ATMOSPHERIC CORRECTION ALGORITHM; REMOTE-SENSING REFLECTANCE; SPECTRAL RELATIONSHIPS; SURFACE-ROUGHNESS; SEAWIFS IMAGERY; INFRARED BANDS; TURBID COASTAL; PRODUCTS; GOCI
Type
Article
Language
English
Document Type
Article
Publisher
OPTICAL SOC AMER
Related Researcher
Research Interests

Ocean Color Remote Sensing,Satellite Applications,Ocean color Algorithm,해양원격탐사,위성활용,해색 알고리즘

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