Publications

Liu, XY; Yang, Q; Wang, YH; Zhang, Y (2022). Evaluation of GOCI Remote Sensing Reflectance Spectral Quality Based on a Quality Assurance Score System in the Bohai Sea. REMOTE SENSING, 14(5), 1075.

Abstract
In the application of ocean color remote sensing, remote sensing reflectance spectral (R-rs(lambda)) is the most important and basic parameter for the development of bio-optical algorithms. Atmospheric correction of ocean color data is a key factor in obtaining accurate water R-rs(lambda) data. Based on the QA (quality assurance) score spectral quality evaluation system, the quality of R-rs(lambda) spectral of GOCI (Geostationary Ocean Color Imager) obtained from four atmospheric-correction algorithms in the Bohai Sea were evaluated and analyzed in this paper. The four atmospheric-correction algorithms are the NASA (National Aeronautics and Space Administration) standard near-infrared atmospheric-correction algorithm (denoted as Seadas-Default), MUMM (Management Unit of the North Sea Mathematical Models, denoted as Seadas-MUMM), and the standard atmospheric-correction algorithms of KOSC GOCI GDPS2.0 (denoted as GDPS2.0) and GDPS1.3 (denoted as GDPS1.3). It is shown that over 90% of the R-rs(lambda) data are in good quality with a score >= 4/6 for the GDPS1.3 algorithm. The probability of R-rs(lambda) with a QA score of 1 is significantly higher for the GDPS1.3 algorithm (57.36%), compared with Seadas-Default (37.91%), Seadas-MUMM (35.96%), and GDPS2.0 (33.05%). The field and MODIS measurements of R-rs(lambda) were compared with simultaneous GOCI R-rs(lambda), and they demonstrate that the QA score system is useful in evaluating the spectral shape of R-rs(lambda). The comparison results indicate that higher QA scores have higher accuracy of the R-rs band ratio. The QA score system is helpful to develop and evaluate bio-optical algorithms based on the band ratio. The hourly variation of QA score from UTC 00:16 to 07:16 was investigated as well, and it demonstrates that the data quality of GOCI R-rs(lambda) can vary in an hour scale. The GOCI data with high quality should be selected with caution when studying the hourly variation of biogeochemical properties in the Bohai Sea from GOCI measurements.

DOI:
10.3390/rs14051075

ISSN:
2072-4292