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Proceedings Paper

In-orbit imaging and radiometric performance prediction for flight model Geostationary Ocean Color Imager
Author(s): Soomin Jeong; Yukyeong Jeong; Dongok Ryu; Seonghui Kim; Seongick Cho; Jinsuk Hong; Sug-Whan Kim; Heong Sik Youn
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Paper Abstract

The Geostationary Ocean Colour Imager (GOCI) is a visible band ocean colour instrument onboard the Communication, Ocean, and Meteorological Satellite (COMS) scheduled to be in operation from early 2010. The instrument is designed to monitor ocean water environments around the Korean peninsula in high spatial and temporal resolutions. We report a new imaging and radiometric performance prediction model specifically designed for GOCI. The model incorporates the Sun as light source, about 4000km x 4000km section of the Earth surrounding the Korean peninsula and the GOCI optical system into a single ray tracing environment in real scale. Specially, the target Earth section is constructed using high resolution coastal line data, and consists of land and ocean surfaces with reflectivity data representing their constituents including vegetation and chlorophyll concentration. The GOCI instrument in the IRT model is constructed as an optical system with realistic surface characteristics including wave front error, reflectivity, absorption, transmission and scattering properties. We then used Monte Carlo based ray tracing computation along the whole optical path starting from the Sun to the final detector plane, for simultaneous imaging and radiometric performance verification for a fixed solar zenith angle. This was then followed by simulation of red-tide evolution detection and their radiance estimation, in accordance with the in-orbit operation sequence. The simulation results prove that the GOCI flight model is capable of detecting both image and radiance originated from the key ocean phenomena including red tide. The model details and computational process are discussed with implications to other earth observation instruments.

Paper Details

Date Published: 21 August 2009
PDF: 12 pages
Proc. SPIE 7452, Earth Observing Systems XIV, 74520F (21 August 2009); doi: 10.1117/12.825982
Show Author Affiliations
Soomin Jeong, Yonsei Univ. (Korea, Republic of)
Yukyeong Jeong, Yonsei Univ. (Korea, Republic of)
Dongok Ryu, Yonsei Univ. (Korea, Republic of)
Seonghui Kim, Korea Aerospace Research Institute (Korea, Republic of)
Seongick Cho, Korea Ocean Research & Development Institute (Korea, Republic of)
Jinsuk Hong, I&A Technology (Korea, Republic of)
Sug-Whan Kim, Yonsei Univ. (Korea, Republic of)
Heong Sik Youn, Korea Aerospace Research Institute (Korea, Republic of)

Published in SPIE Proceedings Vol. 7452:
Earth Observing Systems XIV
James J. Butler; Xiaoxiong Xiong; Xingfa Gu, Editor(s)

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