Ray tracing based ISRD (inter-slot radiometric discrepancy) simulation tool for GOCI

Title
Ray tracing based ISRD (inter-slot radiometric discrepancy) simulation tool for GOCI
Author(s)
안기범; 조성익; 오은송; 박영제; 김석환
KIOST Author(s)
Cho, Seong Ick(조성익)Park, Young Je(박영제)
Publication Year
2015-08-11
Abstract
Geostationary Ocean Color Imager (GOCI) is the world’s first geostationary satellite for ocean color remote sensing mission. It observes coastal and ocean region around the Korean Peninsula, Japan, and East China with a spatial resolution of 500 meters.GOCI uses step-stare imaging technique by the implementation of 2D detector array (1413 x 1430) and 2-axis pointing mechanism. It enables multiple image acquisitions for the same location of FOR (Field Of Regard) at sixty-minute intervals during daytime (8 images per day in nominal operation). Because GOCI IFOV is about a sixteenth of GOCI FOR, an image acquisition and processing sequence for GOCI FOR consists 16 (4 x 4) slot image acquisitions which correspond to GOCI IFOV and image processing to combine 16 slot images into one image for GOCI FOR.Inter Solar Radiometric Discrepancy (ISRD) of GOCI means the radiance (i.e. digital count) discrepancy in the overlapped area between adjacent slot images. This is mainly derived by the difference of solar zenith angle by the gap of acquisition time between slots with overlapped area. Due to the boustrophedonic pattern of GOCI slot image acquisition sequence, maximum difference of acquisition time is about 12 minutes. After the normalization processing in terms of solar zenith angle for the reduction of ISRD, early in GOCI on-orbit operation, systematic residual ISRD about 3% discrepancy was observed for B6 (680nm) aof 500 meters.GOCI uses step-stare imaging technique by the implementation of 2D detector array (1413 x 1430) and 2-axis pointing mechanism. It enables multiple image acquisitions for the same location of FOR (Field Of Regard) at sixty-minute intervals during daytime (8 images per day in nominal operation). Because GOCI IFOV is about a sixteenth of GOCI FOR, an image acquisition and processing sequence for GOCI FOR consists 16 (4 x 4) slot image acquisitions which correspond to GOCI IFOV and image processing to combine 16 slot images into one image for GOCI FOR.Inter Solar Radiometric Discrepancy (ISRD) of GOCI means the radiance (i.e. digital count) discrepancy in the overlapped area between adjacent slot images. This is mainly derived by the difference of solar zenith angle by the gap of acquisition time between slots with overlapped area. Due to the boustrophedonic pattern of GOCI slot image acquisition sequence, maximum difference of acquisition time is about 12 minutes. After the normalization processing in terms of solar zenith angle for the reduction of ISRD, early in GOCI on-orbit operation, systematic residual ISRD about 3% discrepancy was observed for B6 (680nm) a
URI
https://sciwatch.kiost.ac.kr/handle/2020.kiost/25346
Bibliographic Citation
SPIE OPTICS+PHOTONICS 2015, pp.665 - 666, 2015
Publisher
SPIE
Type
Conference
Language
English
Publisher
SPIE
Related Researcher
Research Interests

Development of Ocean Satellites and Data Analytics,해양위성 및 영상분석 실용화 기술 개발

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